District cooling pipes - Bonded single pipe systems for directly buried cold water networks - Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane thermal insulation and a casing of polyethylene

This document specifies requirements, design and test methods for factory made thermally insulated bonded valve assemblies for directly buried district cooling distribution systems, comprising a steel valve  from DN 15 to DN 1200, rigid polyurethane foam insulation and a casing of polyethylene.
The valve assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers.
This document applies only to insulated valve assemblies, for continuous operation with water at various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar.
The design is based on an expected service life with continuous operation of a minimum 50 years.

Fernkälterohre - Einzelrohr-Verbundsysteme für direkt erdverlegte Fernkältenetze - Teil 3: Werkmäßig gefertigte Stahl-Absperrarmaturen für Stahl- oder Kunststoff-Mediumrohre, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen

Dieses Dokument legt die Anforderungen, Auslegung und Prüfverfahren für werkmäßig gefertigte, wärmegedämmte Absperrarmaturen für direkt erdverlegte Fernkühlungsverteilungssysteme fest, bestehend aus einer Stahlarmatur von DN 15 bis DN 1 200, einer Polyurethan-Hartschaumstoffwärmedämmung und einem Mantel aus Polyethylen.
Die Absperrarmatur kann darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.
Dieses Dokument ist nur anzuwenden für gedämmte Absperrarmaturen, für den Dauerbetrieb mit Wasser bei verschiedenen Temperaturen (1 bis 30) °C und einem Betriebsdruck von höchstens 25 bar.
Die Auslegung basiert auf einer erwarteten Lebensdauer von mindestens 50 Jahren bei Dauerbetrieb.

Réseaux d’eau glacée - Systèmes bloqués de tuyaux pour les réseaux d'eau glacée enterrés directement — Partie 3 : Assemblages d'appareils de robinetterie manufacturés pour tubes de service en acier ou en plastique, isolation thermique en polyuréthane et tube de protection en polyéthylène

Le présent document spécifie les exigences, la conception et les méthodes d’essai pour des assemblages manufacturés d’appareils de robinetterie bloqués préisolés thermiquement pour les réseaux de distribution d’eau glacée urbains enterrés directement, constitués d’un appareil de robinetterie en acier de DN 15 à DN 1200, d’une isolation en mousse de polyuréthane rigide et d’un tube de protection en polyéthylène.
L’assemblage d’appareils de robinetterie peut également comprendre les éléments supplémentaires suivants : les câbles de mesure, les entretoises et les barrières anti diffusion.
Ce document ne concerne que les assemblages d’appareils de robinetterie, destinés à un usage continu avec de l’eau à diverses températures (de 1 à 30) °C et à une pression de service maximale de 25 bar.
La conception est fondée sur une durée utile prévue en fonctionnement continu d’au moins 50 ans.

Cevi za daljinsko hlajenje - Spojeni enocevni sistemi za neposredno vkopana hladnovodna omrežja - 3. del: Tovarniško izdelan sestav jeklenih ventilov iz jeklene ali plastične delovne cevi, poliuretanske toplotne izolacije in polietilenskega plašča

General Information

Status
Published
Public Enquiry End Date
30-Sep-2020
Publication Date
12-Sep-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Sep-2021
Due Date
14-Nov-2021
Completion Date
13-Sep-2021

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SLOVENSKI STANDARD
SIST EN 17415-3:2021
01-november-2021
Cevi za daljinsko hlajenje - Spojeni enocevni sistemi za neposredno vkopana
hladnovodna omrežja - 3. del: Tovarniško izdelan sestav jeklenih ventilov iz
jeklene ali plastične delovne cevi, poliuretanske toplotne izolacije in
polietilenskega plašča

District cooling pipes - Bonded single pipe systems for directly buried cold water

networks - Part 3: Factory made steel valve assembly for steel or plastic service pipe,

polyurethane thermal insulation and a casing of polyethylene

Fernkälterohre - Einzelrohr-Verbundsysteme für direkt erdverlegte Fernkältenetze - Teil

3: Werkmäßig gefertigte Stahl-Absperrarmaturen für Stahl- oder Kunststoff-
Mediumrohre, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus
Polyethylen
Réseaux d’eau glacée - Systèmes bloqués de tuyaux pour les réseaux d'eau glacée

enterrés directement — Partie 3 : Assemblages d'appareils de robinetterie manufacturés

pour tubes de service en acier ou en plastique, isolation thermique en polyuréthane et

tube de protection en polyéthylène
Ta slovenski standard je istoveten z: EN 17415-3:2021
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
SIST EN 17415-3:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17415-3:2021
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SIST EN 17415-3:2021
EN 17415-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 23.040.99
English Version
District cooling pipes - Bonded single pipe systems for
directly buried cold water networks - Part 3: Factory made
steel valve assembly for steel or plastic service pipe,
polyurethane thermal insulation and a casing of
polyethylene

Réseaux d'eau glacée - Systèmes bloqués de tuyaux Fernkälterohre - Einzelrohr-Verbundsysteme für

pour les réseaux d'eau glacée enterrés directement - direkt erdverlegte Fernkältenetze - Teil 3: Werkmäßig

Partie 3 : Assemblages d'appareils de robinetterie gefertigte Stahl-Absperrarmaturen für Stahl- oder

manufacturés pour tubes de service en acier ou en Kunststoff-Mediumrohre, einer Wärmedämmung aus

plastique, isolation thermique en polyuréthane et tube Polyurethan und einer Ummantelung aus Polyethylen

de protection en polyéthylène
This European Standard was approved by CEN on 18 July 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17415-3:2021 E

worldwide for CEN national Members.
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SIST EN 17415-3:2021
EN 17415-3:2021
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Requirements ................................................................................................................................................... 6

4.1 Pressure ratings for valves .......................................................................................................................... 6

4.2 Service temperatures for valves ................................................................................................................ 6

4.3 Steel parts .......................................................................................................................................................... 6

4.4 Casing .................................................................................................................................................................. 8

4.5 Polyurethane (PUR) foam thermal insulation ...................................................................................... 8

4.6 Valve assembly ................................................................................................................................................. 8

4.7 Requirements for effective operation and maintenance ............................................................... 10

4.8 Resistance to axial forces and bending moments............................................................................. 10

5 Testing, test methods and test requirements .................................................................................... 10

5.1 General ............................................................................................................................................................. 10

5.2 Test specimens .............................................................................................................................................. 10

5.3 Steel parts ....................................................................................................................................................... 11

5.4 Casing ............................................................................................................................................................... 16

5.5 Polyurethane (PUR) foam thermal insulation ................................................................................... 16

5.6 Valve assembly .............................................................................................................................................. 16

5.7 Surveillance system ..................................................................................................................................... 16

6 Marking ............................................................................................................................................................ 16

6.1 General ............................................................................................................................................................. 16

6.2 Steel valve ....................................................................................................................................................... 17

6.3 Casing ............................................................................................................................................................... 17

6.4 Valve assembly .............................................................................................................................................. 17

7 Installation and maintenance .................................................................................................................. 17

Annex A (informative) Guidelines for inspection and testing ..................................................................... 18

Annex B (normative) Resistance to axial force and bending moment ..................................................... 20

Annex C (normative) Resistance to bending forces ........................................................................................ 25

Annex D (informative) Waste treatment and recycling ................................................................................ 29

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SIST EN 17415-3:2021
EN 17415-3:2021
European foreword

This document (EN 17415-3:2021) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2022, and conflicting national standards shall

be withdrawn at the latest by March 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 17415-3:2021
EN 17415-3:2021
Introduction

Factory made bonded single pipe systems for directly buried district cooling networks are of common

technical usage. In order to ensure quality including product-related service life, to ensure safety in use,

economical energy usage and to facilitate comparability in the market, CEN/TC 107 decided to set up

standards for these products.

This document is one of a series of standards which form several parts of EN 17415, District cooling

pipes – Bonded single pipe systems for directly buried cold water networks:

— Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal insulation

and a casing of polyethylene;

— Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal insulation

and a casing of polyethylene;

— Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane thermal

insulation and a casing of polyethylene (this document).
The other standards from CEN/TC 107 covering this subject are:

— EN 17414-1, District cooling pipes — Factory made flexible pipe systems — Part 1: Classification,

general requirements and test methods;

— EN 17414-2, District cooling pipes — Factory made flexible pipe systems — Part 2: Bonded system

with plastic service pipes; requirements and test methods;

— EN 17414-3, District cooling pipes — Factory made flexible pipe systems — Part 3: Non bonded system

with plastic service pipes; requirements and test methods;

— EN XXXXX-1, District cooling pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried cold water networks — Part 1: Design;

— EN XXXXX-2, District cooling pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried cold water networks — Part 2: Installation;

— EN 489-1, District heating pipes — Bonded single and twin pipe systems for buried hot water

networks — Part 1: Joint casing assemblies and thermal insulation for hot water networks in

accordance with EN 13941-1;

— EN 14419, District heating pipes — Bonded single and twin pipe systems for directly buried hot water

networks — Surveillance systems.
Waste management and recycling of materials is dealt with in Annex D.
1 Under development.
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SIST EN 17415-3:2021
EN 17415-3:2021
1 Scope

This document specifies requirements, design and test methods for factory made thermally insulated

bonded valve assemblies for directly buried district cooling distribution systems, comprising a steel

valve from DN 15 to DN 1 200, rigid polyurethane foam insulation and a casing of polyethylene.

The valve assembly can also include the following additional elements: measuring wires, spacers and

diffusion barriers.

This document applies only to insulated valve assemblies, for continuous operation with water at

various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar.

The design is based on an expected service life with continuous operation of a minimum 50 years.

NOTE An expected service life of 50 years presupposes that treated water is used.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 19, Industrial valves - Marking of metallic valves
EN 736-1, Valves - Terminology - Part 1: Definition of types of valves

EN 1092-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN

designated - Part 1: Steel flanges
EN 10088-1, Stainless steels - Part 1: List of stainless steels
EN 10204, Metallic products - Types of inspection documents

EN 12201-2:2011+A1:2013, Plastics piping systems for water supply, and for drainage and sewerage

under pressure - Polyethylene (PE) - Part 2: Pipes

EN 12266-1, Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and

acceptance criteria - Mandatory requirements

EN 13941-1, District heating pipes - Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried hot water networks - Part 1: Design

EN 14419, District heating pipes - Bonded single and twin pipe systems for buried hot water networks -

Surveillance systems

EN 17248, District heating and district cooling pipe systems - Terms and definitions

EN 17415-1, District cooling pipes - Bonded single pipe systems for directly buried cold water networks -

Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal insulation and a

casing of polyethylene

EN 17415-2:2021, District cooling pipes - Bonded single pipe systems for directly buried cold water

networks - Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal

insulation and a casing of polyethylenen

EN ISO 12944-2, Paints and varnishes - Corrosion protection of steel structures by protective paint systems

- Part 2: Classification of environments (ISO 12944-2)
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SIST EN 17415-3:2021
EN 17415-3:2021

EN ISO 12944-5, Paints and varnishes - Corrosion protection of steel structures by protective paint systems

- Part 5: Protective paint systems (ISO 12944-5)

CEN/TS 15223, Plastics piping systems - Validated design parameters of buried thermoplastics piping

systems
3 Terms and definitions

For the purposes of this document the terms and definitions given in EN 17248, EN 736-1 and

EN 17415-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Requirements
4.1 Pressure ratings for valves
4.1.1 General

The valves shall be designed for use in pipe systems with a maximum operating pressure of 16 bar or

25 bar depending on the system design pressure.

The valves shall be able to withstand a strength test pressure of the district cooling system of 1,3 times

the maximum operating pressure at ambient temperature in open and closed position.

4.1.2 Valves without indicated flow direction

Valves without an indicated flow direction shall support the pressure load in both directions.

4.2 Service temperatures for valves

The valves shall be able to withstand continuous operation with cold water at various temperatures in

accordance with EN 17415-1.
4.3 Steel parts
4.3.1 General

Steel grades shall be in accordance with the steel material specifications in EN 17415-1.

All valves, steel pipes and steel components used for manufacturing of valve assemblies under the scope

of this document shall as a minimum be delivered to the manufacturer with an inspection certificate 3.1

according to EN 10204. The inspection certificate shall on request be passed on to the client who orders

the valve assemblies.

In case a material related inspection certificate 3.1 according to EN 10204 is required by the client who

orders the valve assemblies, this information shall be given while placing the order with the

manufacturer of the factory made valve assemblies.

NOTE Any later request for provision of such documentation could be too late and possibly can't be met by

the manufacturer, since the manufacturer needs to organize the assignment of 3.1 certificates to valves and valve

assemblies before starting the production.
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SIST EN 17415-3:2021
EN 17415-3:2021
4.3.2 Valve body

The valve shall be fully welded. Detachable joints, such as flanged or screwed connections, except

sealing system at the stem, shall not be used in the pressurized area.
4.3.3 Valve extension pipe quality

The quality of the valve body shall match with the quality of the valve extension pipe.

4.3.4 Valve extension pipe ends
4.3.4.1 Valves for steel service pipe systems

The welding ends of the valve assembly shall match with the service pipe in accordance with

EN 17415-1.
Pipe ends shall be prepared in accordance with EN 17415-2.
4.3.4.2 Valves for plastic service pipe systems

The ends of the extension pipes shall be designed in accordance with one of the following three

alternatives:

1. Extension steel pipes with steel–to–PE transition fittings or alternatively steel–to–PB, –PE-X,

–PE-RT, –PP or –multilayer plastic transition fittings. The plastic transition fitting ends shall match

with adjacent plastic service pipes in accordance with EN 17415-1. Plastic pipe ends shall be

prepared in accordance with EN 17415-2.

2. Extension steel pipe ends with welding neck flanges in accordance with EN 1092-1 for connection

to adjacent plastic service pipes by using flange adaptors and backing flanges. The extension steel

pipe ends including flanges shall be made from acid resistant stainless steel of steel grade minimum

1.4404 as defined in EN 10088-1.

3. Extension steel pipe ends with welding neck flanges as in alternative 2 but made from carbon steel

and protected by a paint system securing durability range “high” according to EN ISO 12944-5.

Underground installed valves shall be suitable for corrosivity categories of Im1, Im2 and Im3

according to EN ISO 12944-2 and for atmospheric-corrosivity categories C5-M and C5-I according

to EN ISO 12944-2. Specifically used paint system shall be according to EN ISO 12944-5 and

documented by appropriate quality management system.

NOTE The outer diameter of a casing in accordance with EN 17415-1 is bigger than the outer diameter of

a welding neck flange only for a corresponding factory made pipe assembly with a Series 2 insulation

thickness. This implies that the outer diameter of the flange needs to be specifically considered when a valve

assembly with welding neck flanges is intended to be connected to adjacent pipe assemblies with a Series 1

or Series 0 insulation thickness.
4.3.5 Welding of steel parts

Fusion welding between valves and valve extension pipe, shall be carried out in accordance with

EN 17415-2.

The quality of the steel at the welding ends of the valve or valve assembly shall match with steel of the

service pipes.
Welding of pressurized parts of the valve assembly shall comply with EN 17415-2.
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SIST EN 17415-3:2021
EN 17415-3:2021
4.3.6 Internal valve parts

Balls, gates and butterfly discs shall be made from stainless steel as specified in 4.6.2.

Ball valves shall be soft sealed. Butterfly valves shall have metallic or soft-seals.

4.4 Casing
4.4.1 General
The casing shall be in accordance with EN 17415-2 and EN 17415-1.
4.4.2 Requirements for polyethylene welding

The general requirements for polyethylene welding shall be in accordance with EN 17415-2.

4.4.3 Diameter and wall thickness of the casing

The outside diameter and the minimum wall thickness of the casing shall be in accordance with

EN 17415-1.
4.5 Polyurethane (PUR) foam thermal insulation
4.5.1 General

The requirements for thermal insulation shall be the same as in EN 17415-1. The thermal insulation

shall be tested in accordance with 5.5.
4.5.2 Minimum thickness of thermal insulation

The minimum thickness of the thermal insulation shall be in accordance with EN 17415-2.

4.6 Valve assembly
4.6.1 Ends of valve assembly
4.6.1.1 General

The ends of the valve extension pipes of the valve assembly intended for steel service pipes shall be

prepared for welding according to 4.3.4.1 and shall be free from thermal insulation in accordance with

EN 17415-1.

The ends of the transition fittings of the valve assembly intended for plastics service pipes shall be

prepared for welding according to 4.3.4.2. The free plastic pipe part of the transition fitting shall be free

from thermal insulation.

Valve assemblies with welding neck flanges intended for plastics service pipe joints shall be free from

thermal insulation and casing in such a way that bolts for a flanged joint in accordance with 4.3.4.2 can

be placed from the valve assembly side.

The casing of the valve assembly shall be sealed to the valve extension service pipes by end seals

(end caps) that shall be heat-shrunk onto the service pipe ends as well as the casing ends.

4.6.1.2 Centre line deviation

The distance between the centre lines of the valve extension pipe and the casing at the ends of the valve

assembly shall not exceed the limits given in EN 17415-1.

The centre line deviation shall be measured between the centre lines with the largest deviation.

---------------------- Page: 10 ----------------------
SIST EN 17415-3:2021
EN 17415-3:2021
4.6.1.3 Angular deviation

The angular deviation between the centre lines of the not insulated ends of the valve extension pipe at

the length of 100 mm from the ends shall not exceed 2 °.

The angular deviation shall be measured between the centre lines with the largest deviation.

4.6.2 End of stem construction

To ensure a long service life of the stem end passing through the casing, it shall withstand the

aggressive underground condition such as cold, moisture, ground and salty water. Where the stem

construction passes the casing there shall be an arrangement to protect against water ingress to the

thermal insulation.

The stem construction outside the thermal insulation shall be made from stainless steel as defined in

EN 10088-1, however minimum specified Cr-content is 16 %.

NOTE Factors influencing the corrosion probability of the stainless steel construction can be assessed

according to EN 12502-4.

Under specific installation and operation conditions a chrome content of 16 % alone might not be

sufficient, so that other alloy elements are then recommended.

Specifically used steel type shall be documented by appropriate quality management system.

The protection by corrosion resistant material shall be added at the full length of stem.

4.6.3 Main dimensions of the valve assembly
The main dimensions of the valve assembly H and L are shown in Figure 1.

The values of the main dimensions “L” and “H” shall be declared by the manufacturer.

The tolerances of the valve assembly dimensions shown in Figure 1 shall be in accordance with Table 1.

Table 1 — Tolerances on the main valve dimensions
DN H L
mm mm
≤ 300 ±5 ±20
> 300 ±10 ±50
Key
L length H high offset
Figure 1 — Main dimensions
---------------------- Page: 11 ----------------------
SIST EN 17415-3:2021
EN 17415-3:2021
4.6.4 Installation of measuring elements

Measuring elements for surveillance systems shall be in accordance with EN 14419.

4.7 Requirements for effective operation and maintenance

The design of the valve shall make it possible to operate the valve outside the thermal insulation and

the casing.
The valve shall close when turned clockwise and open when turned anti-clockwise.

The stem construction shall make it possible to manoeuvre the valve by means of a T key from ground

level.

NOTE 1 Commonly used keyways are 19 mm, 27 mm, 36 mm, 50 mm and 60 mm or conical quadrangle

27 mm/ 32 mm.

Butterfly valves with nominal diameter DN 100 and larger, ball valves and gate valves with nominal

diameter DN 200 and larger shall be provided with a gear or a connection for an actuator to ensure

controlled manoeuvring of the valve.

NOTE 2 Commonly used keyways for connections for actuators are 60 mm, 70 mm and 90 mm, or conical

quadrangle 27 mm/32 mm.

Valves shall be provided with a stop device that can be replaced without removing the thermal

insulation and the casing. Alternatively, an internal stop device can be used. The internal stop device

shall be designed to resist a maximum strength torque of at least twice the maximum operating torque

specified by the manufacturer with a minimum of 150 Nm in the fully open and fully closed position of

the valve. Using an internal stop device, the valve stem shall be designed to resist a maximum strength

torque of at least 1,5 times the designed strength torque of the stop device.

The sealing around the stem shall be capable of being maintained without removing the thermal

insulation and the casing.
4.8 Resistance to axial forces and bending moments

The resistance of the valves to axial forces and bending moments shall comply with Table B.1 regarding

valves intended for both steel and plastic service pipe systems and comply with Table B.2 regarding

valves intended only for plastic service pipe systems.
5 Testing, test methods and test requirements
5.1 General

This Clause specifies test methods, test sequence, test conditions and required test results for type and

production testing.

Where test requirements specified in this document differ from those in other standards referred to, the

requirements described in this document shall apply.

NOTE Informative Annex A of this document gives guidelines for inspection and testing.

5.2 Test specimens
5.2.1 General
Test specimens shall be representative for the production.
---------------------- Page: 12 ----------------------
SIST EN 17415-3:2021
EN 17415-3:2021
5.2.2 Test specimens for type testing steel parts of valve

The tests for axial forces, bending moments and torque are type tests for a range of valves with the

same construction principle, design and materials.

To qualify a whole product range with the same construction principle, design and materials, two valve

sizes within this product range shall be tested. The qualification shall be valid from half the size of the

smaller valve (but limited by smallest valve size of the product range under consideration) and twice

the size of the bigger valve (but limited by the largest valve size of the product range under

consideration) which were tested.

If the construction principle, design and materials are not the same for the whole product range, the

product range shall be split in separate ranges (where the construction principle, design and materials

are the same) and the above mentioned rule shall be applied to each split range. The manufacturer is

responsible to ensure that the complete test sequence as specified in this document is carried out and

all test results are documented.
5.2.3 Test specimens from casings and thermal insulation

The test specimens from casing and thermal insulation shall be taken in accordance with EN 17415-2.

5.3 Steel parts
5.3.1 General
This Clause describes the type test and production test of the steel parts.

Test loads in accordance with Table B.1 shall be applied to valves intended for both steel and plastic

service pipe systems and in accordance with Table B.2 to valves intended only for plastic service pipe

systems.

Where Table B.1 is specified in 5.3.2, the specification shall be replaced by Table B.2 for valves intended

only for plastic service pipe systems.
5.3.2 Type test of the steel parts
5.3.2.1 General

The type test shall be carried out on the same valve for the whole test sequence and executed in the

order given in Table 2. The mandatory clauses shall be carried out as a minimum in the test program.

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SIST EN 17415-3:2021
EN 17415-3:2021
...

SLOVENSKI STANDARD
oSIST prEN 17415-3:2020
01-september-2020
Cevi za daljinsko hlajenje - Spojeni enocevni sistemi za neposredno vkopana
hladnovodna omrežja - 3. del: Tovarniško izdelan sestav jeklenih ventilov iz
jeklene ali plastične delovne cevi, poliuretanske toplotne izolacije in
polietilenskega plašča

District cooling pipes - Bonded single pipe systems for directly buried cold water

networks - Part 3: Factory made steel valve assembly for steel or plastic service pipe,

polyurethane thermal insulation and a casing of polyethylene

Fernkälterohre - Einzelrohr-Verbundsysteme für direkt erdverlegte Fernkältenetze - Teil

3: Werkmäßig gefertigte Stahl-Absperrarmaturen für Stahl- oder Kunststoff-
Mediumrohre, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus
Polyethylen
Réseaux d’eau glacée - Systèmes bloqués de tuyaux pour les réseaux d'eau glacée

enterrés directement — Partie 3 : Assemblages d'appareils de robinetterie manufacturés

pour tubes de service en acier ou en plastique, isolation thermique en polyuréthane et

tube de protection en polyéthylène
Ta slovenski standard je istoveten z: prEN 17415-3
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
oSIST prEN 17415-3:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17415-3:2020
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oSIST prEN 17415-3:2020
DRAFT
EUROPEAN STANDARD
prEN 17415-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2020
ICS 23.040.99
English Version
District cooling pipes - Bonded single pipe systems for
directly buried cold water networks - Part 3: Factory made
steel valve assembly for steel or plastic service pipe,
polyurethane thermal insulation and a casing of
polyethylene

Réseaux d'eau glacée - Systèmes bloqués de tuyaux Fernkälterohre - Einzelrohr-Verbundsysteme für

pour les réseaux d'eau glacée enterrés directement - direkt erdverlegte Fernkältenetze - Teil 3: Werkmäßig

Partie 3 : Assemblages d'appareils de robinetterie gefertigte Stahl-Absperrarmaturen für Stahl- oder

manufacturés pour tubes de service en acier ou en Kunststoff-Mediumrohre, einer Wärmedämmung aus

plastique, isolation thermique en polyuréthane et tube Polyurethan und einer Ummantelung aus Polyethylen

de protection en polyéthylène

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 107.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17415-3:2020 E

worldwide for CEN national Members.
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Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Requirements ................................................................................................................................................... 6

4.1 Pressure ratings for valves .......................................................................................................................... 6

4.2 Service temperatures for valves ................................................................................................................ 6

4.3 Steel parts .......................................................................................................................................................... 6

4.4 Casing .................................................................................................................................................................. 8

4.5 Polyurethane (PUR) foam thermal insulation ...................................................................................... 8

4.6 Valve assembly ................................................................................................................................................. 8

4.7 Requirements for effective operation and maintenance ............................................................... 10

4.8 Resistance to axial forces and bending moments............................................................................. 11

5 Testing, test methods and test requirements .................................................................................... 11

5.1 General ............................................................................................................................................................. 11

5.2 Test specimens .............................................................................................................................................. 11

5.3 Steel parts ....................................................................................................................................................... 11

5.4 Casing ............................................................................................................................................................... 16

5.5 Polyurethane (PUR) foam thermal insulation ................................................................................... 16

5.6 Valve assembly .............................................................................................................................................. 16

5.7 Surveillance system ..................................................................................................................................... 16

6 Marking ............................................................................................................................................................ 16

6.1 General ............................................................................................................................................................. 16

6.2 Steel valve ....................................................................................................................................................... 17

6.3 Casing ............................................................................................................................................................... 17

6.4 Valve assembly .............................................................................................................................................. 17

7 Installation and maintenance .................................................................................................................. 17

Annex A (informative) Guidelines for inspection and testing ..................................................................... 18

Annex B (normative) Resistance to axial force and bending moment ..................................................... 20

Annex C (normative) Resistance to bending forces ........................................................................................ 25

Annex D (informative) Waste treatment and recycling ................................................................................ 30

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European foreword

This document (prEN 17415-3:2020) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS.

This document is currently submitted to the CEN Enquiry.
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Introduction

Factory made bonded single pipe systems for directly buried district cooling networks are of common

technical usage. In order to ensure quality including product-related service life, to assure safety in use,

economical energy usage and to facilitate comparability in the market, CEN/TC 107 decided to set up

standards for these products.

This document is one of a series of standards which form several parts of EN 17415, District cooling

pipes – Bonded single pipe systems for directly buried cold water networks:

Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal insulation and a

casing of polyethylene ;

Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal insulation

and a casing of polyethylene ;

Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane thermal insulation

and a casing of polyethylene ;
The other standards from CEN/TC 107 covering this subject are:

EN 17414-1, District cooling pipes – Factory made flexible pipe systems – Part 1: Classification, general

requirements and test methods ;

EN 17414-2, District cooling pipes – Factory made flexible pipe systems – Part 2: Bonded system with

plastic service pipes; requirements and test methods ;

EN 17414-3, District cooling pipes – Factory made flexible pipe systems – Part 3: Non bonded system with

plastic service pipes; requirements and test methods ;

EN ZZZZZ-1, District cooling pipes – Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried cold water networks – Part 1: Design ;

EN ZZZZZ-2, District cooling pipes – Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried cold water networks – Part 2: Installation

— EN 489-1, District heating pipes – Bonded single and twin pipe systems for buried hot water

networks – Part 1: Joint casing assemblies and thermal insulation for hot water networks in

accordance with EN 13941-1;

— EN 14419, District heating pipes – Bonded single and twin pipe systems for directly buried hot water

networks – Surveillance systems;
Under development.
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1 Scope

This document specifies requirements, design and test methods for factory made thermally insulated

bonded valve assemblies for directly buried district cooling distribution systems, comprising a steel

valve from DN 15 to DN 1200, rigid polyurethane foam insulation and a casing of polyethylene.

The valve assembly can also include the following additional elements: measuring wires, spacers and

diffusion barriers.

This document applies only to insulated valve assemblies, for continuous operation with water at

various temperatures (1 to 30)°C and a maximum operation pressure of 25 bar.

The design is based on an expected service life with continuous operation of a minimum 50 years.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 19, Industrial valves - Marking of metallic valves
EN 736-1, Valves - Terminology - Part 1: Definition of types of valves

EN 1092-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN

designated - Part 1: Steel flanges
EN 10088-1, Stainless steels - Part 1: List of stainless steels
EN 10204, Metallic products - Types of inspection documents

EN 12201-2:2001+A1:2013, Plastics piping systems for water supply, and for drainage and sewerage

under pressure - Polyethylene (PE) - Part 2: Pipes

EN 12266-1, Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and

acceptance criteria - Mandatory requirements

EN 13941-1, District heating pipes - Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried hot water networks - Part 1: Design

EN 14419, District heating pipes - Bonded single and twin pipe systems for buried hot water networks -

Surveillance systems

prEN 17415-1, District cooling pipes — Bonded single pipe systems for directly buried cold water

networks — Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal

insulation and a casing of polyethylene1

prEN 17415-2, District cooling pipes — Bonded single pipe systems for directly buried cold water

networks — Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane

thermal insulation and a casing of polyethylene

EN ISO 12944-2, Paints and varnishes - Corrosion protection of steel structures by protective paint systems

- Part 2: Classification of environments (ISO 12944-2:2017)
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EN ISO 12944-5, Paints and varnishes - Corrosion protection of steel structures by protective paint systems

- Part 5: Protective paint systems (ISO 12944-5:2019)

CEN/TS 15223, Plastics piping systems - Validated design parameters of buried thermoplastics piping

systems
3 Terms and definitions

For the purposes of this document the terms and definitions given in prEN 17415-1 and EN 736-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Requirements
4.1 Pressure ratings for valves
4.1.1 General

The valves shall be designed for use in pipe systems with a maximum operating pressure of 16 bar or

25 bar.

The valves shall be able to withstand a strength test pressure of the district cooling system of 1,3 times

the maximum operating pressure at ambient temperature in open and closed position.

4.1.2 Valves without indicated flow direction

Valves without an indicated flow direction shall support the pressure load in both directions.

4.2 Service temperatures for valves

The valves shall be able to withstand continuous operation with cold water at various temperatures in

accordance with EN 17415-1.
4.3 Steel parts
4.3.1 General

Steel grades shall be in accordance with the steel material specifications in EN 17415-1.

All valves, steel pipes and steel components used for manufacturing of valve assemblies under the scope

of this document shall as a minimum be delivered to the manufacturer with an inspection certificate 3.1

according to EN 10204. The inspection certificate shall on request be passed on to the client who orders

the valve assemblies.

In case a material related inspection certificate 3.1 according to EN 10204 is required by the client who

orders the valve assemblies, this information shall be given while placing the order with the

manufacturer of the factory made valve assemblies.

NOTE Any later request for provision of such documentation can be too late and can possibly not be met by

the manufacturer, since the manufacturer has to organize the assignment of 3.1 certificates to valves and valve

assemblies before starting the production.
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4.3.2 Valve body

The valve shall be fully welded. Detachable joints, such as flanged or screwed connections, except

sealing system at the stem, shall not be used in the pressurized area.
4.3.3 Valve extension pipe quality

The quality of the valve body shall match with the quality of the valve extension pipe.

4.3.4 Valve extension pipe ends
4.3.4.1 Valves for steel service pipe systems

The welding ends of the valve assembly shall match with the service pipe in accordance with

prEN 17415-1.
Pipe ends shall be prepared in accordance with prEN 17415-2.
4.3.4.2 Valves for plastic service pipe systems

The ends of the extension pipes shall be designed in accordance with one of the following three

alternatives:

1. Extension steel pipes with steel–to–PE transition fittings or alternatively steel–to–PB, –PE-X,

–PE-RT, –PP or –multilayer plastic transition fittings. The plastic transition fitting ends shall

match with adjacent plastic service pipes in accordance with prEN 17415-1. Plastic pipe ends

shall be prepared in accordance with prEN 17415-2.

2. Extension steel pipe ends with welding neck flanges in accordance with EN 1092-1 for

connection to adjacent plastic service pipes by using flange adaptors and backing flanges. The

extension steel pipe ends including flanges shall be made from acid resistant stainless steel of

steel grade minimum 1.4404 as defined in EN 10088-1.

3. Extension steel pipe ends with welding neck flanges as in alternative 2 but made from carbon

steel and protected by a paint system securing durability range “high” according to

EN ISO 12944-5. Underground installed valves shall be suitable for corrosivity categories of

Im1, Im2 and Im3 according to EN ISO 12944-2 and for atmospheric-corrosivity categories C5-

M and C5-I according to EN ISO 12944-2. Specifically used paint system shall be according to

EN ISO 12944-5 and documented by appropriate quality management system.

The outer diameter of a casing in accordance with prEN 17415-1 is bigger than the outer diameter of a

welding neck flange only for a corresponding factory made pipe assembly with a Series 2 insulation

thickness, i.e. the outer diameter of the flange must be specifically considered when a valve assembly

with welding neck flanges is intended to be connected to adjacent pipe assemblies with a Series 1 or

Series 0 insulation thickness.
4.3.5 Welding of steel parts

Fusion welding between valves and valve extension pipe, shall be carried out in accordance with

prEN 17415-2.

The quality of the steel at the welding ends of the valve or valve assembly shall match with steel of the

service pipes.

Welding of pressurized parts of the valve assembly shall comply with prEN 17415-2.

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4.3.6 Internal valve parts

Balls, gates and butterfly discs shall be made from stainless steel as specified in 4.6.2.

Ball valves and butterfly valves shall be soft-sealed.
4.4 Casing
4.4.1 General
The casing shall be in accordance with prEN 17415-2 and prEN 17415-1.
4.4.2 Requirements for polyethylene welding

The general requirements for polyethylene welding shall be in accordance with prEN 17415-2.

4.4.3 Diameter and wall thickness of the casing

The outside diameter and the minimum wall thickness of the casing shall be in accordance with

prEN 17415-1.
4.5 Polyurethane (PUR) foam thermal insulation
4.5.1 General

The requirements for thermal insulation shall be the same as in prEN 17415-1. The thermal insulation

shall be tested in accordance with 5.5.
4.5.2 Minimum thickness of thermal insulation

The minimum thickness of the thermal insulation shall be in accordance with prEN 17415-2.

4.6 Valve assembly
4.6.1 Ends of valve assembly
4.6.1.1 General

The ends of the valve extension pipes of the valve assembly intended for steel service pipes shall be

prepared for welding according to 4.3.4.1 and shall be free from thermal insulation in accordance with

prEN 17415-1.

The ends of the transition fittings of the valve assembly intended for plastics service pipes shall be

prepared for welding according to 4.3.4.2. The free plastic pipe part of the transition fitting shall be free

from thermal insulation.

Valve assemblies with welding neck flanges intended for plastics service pipe joints shall be free from

thermal insulation and casing in such a way that bolts for a flanged joint in accordance with 4.3.4.2 can

be placed from the valve assembly side.

The casing of the valve assembly shall be sealed to the valve extension service pipes by end seals

(end caps) that shall be heat-shrunk onto the service pipe ends as well as the casing ends.

4.6.1.2 Centre line deviation

The distance between the centre lines of the valve extension pipe and the casing at the ends of the valve

assembly shall not exceed the limits given in prEN 17415-1.

The centre line deviation shall be measured between the centre lines with the largest deviation.

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4.6.1.3 Angular deviation

The angular deviation between the centre lines of the not insulated ends of the valve extension pipe at

the length of 100 mm from the ends shall not exceed 2°.

The angular deviation shall be measured between the centre lines with the largest deviation.

4.6.2 End of stem construction

To ensure a long service life of the stem end passing through the casing, it shall withstand the

aggressive underground condition such as cold, moisture, ground and salty water. Where the stem

construction passes the casing there shall be an arrangement to protect against water ingress to the

thermal insulation.

The stem construction outside the thermal insulation shall be made from stainless steel as defined in

EN 10088-1, however minimum specified Cr-content is 16 %.

NOTE Factors influencing the corrosion probability of the stainless steel construction can be assessed

according to EN 12502-4.

Under specific installation and operation conditions a chrome content of 16 % alone might not be

sufficient, so that other alloy elements are then recommended.

Specifically used steel type shall be documented by appropriate quality management system.

The protection by corrosion resistant material shall be added at the length of at least 100 mm from the

top of the ‘stem house’ (see Figure 1).
Figure 1 — Anti corrosion protection of the stem construction
4.6.3 Main dimensions of the valve assembly
The main dimensions of the valve assembly H and L are shown in Figure 2.

The values of the main dimensions “L” and “H” shall be declared by the manufacturer.

The tolerances of the valve assembly dimensions shown in Figure 2 shall be in accordance with Table 1.

Table 1 — Tolerances on the main valve dimensions
DN H L
mm mm
≤ 300 ±5 ±20
> 300 ±10 ±50
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Key
L length H high offset
Figure 2 — Main dimensions
4.6.4 Installation of measuring elements

Measuring elements for surveillance systems shall be in accordance with EN 14419.

4.7 Requirements for effective operation and maintenance

The design of the valve shall make it possible to operate the valve outside the thermal insulation and

the casing.
The valve shall close when turned clockwise and open when turned anti-clockwise.

The stem construction shall make it possible to manoeuvre the valve by means of a T key from ground

level.

NOTE 1 Commonly used keyways are 19 mm, 27 mm, 36 mm, 50 mm and 60 mm or conical quadrangle

27 mm/ 32 mm.

Butterfly valves with nominal diameter DN 100 and larger, ball valves and gate valves with nominal

diameter DN 200 and larger shall be provided with a gear or a connection for an actuator to ensure

controlled manoeuvring of the valve.

NOTE 2 Commonly used keyways for connections for actuators are 60 mm, 70 mm and 90 mm, or conical

quadrangle 27 mm/32 mm.

Valves shall be provided with a stop device that can be replaced without removing the thermal

insulation and the casing. Alternatively, an internal stop device can be used. The internal stop device

shall be designed to resist a maximum strength torque of at least twice the maximum operating torque

specified by the manufacturer with a minimum of 150 Nm in the fully open and fully closed position of

the valve. Using an internal stop device, the valve stem shall be designed to resist a maximum strength

torque of at least 1,5 times the designed strength torque of the stop device.

The sealing around the stem shall be capable of being maintained without removing the thermal

insulation and the casing.
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4.8 Resistance to axial forces and bending moments

The resistance of the valves to axial forces and bending moments shall comply with Table B.1 regarding

valves intended for both steel and plastic service pipe systems and comply with Table B.2 regarding

valves intended only for plastic service pipe systems.
5 Testing, test methods and test requirements
5.1 General

This clause specifies test methods, test sequence, test conditions and required test results for type and

production testing.

Where test requirements specified in this document differ from those in other standards referred to, the

requirements described in this document shall apply.

NOTE Informative Annex A of this document gives guidelines for inspection and testing.

5.2 Test specimens
5.2.1 General
Test specimens shall be representative for the production.
5.2.2 Test specimens for type testing steel parts of valve

The tests for axial forces, bending moments and torque are type tests for a range of valves with the

same construction principle, design and materials.

To qualify a whole product range with the same construction principle, design and materials, two valve

sizes within this product range shall be tested. The qualification shall be valid from half the size of the

smaller valve (but limited by smallest valve size of the product range under consideration) and twice

the size of the bigger valve (but limited by the largest valve size of the product range under

consideration) which were tested.

If the construction principle, design and materials are not the same for the whole product range, the

product range shall be split in separate ranges (where the construction principle, design and materials

are the same) and the above mentioned rule shall be applied to each split range. The manufacturer is

responsible to ensure that the complete test sequence as specified in this document is carried out and

all test results are documented.
5.2.3 Test specimens from casings and thermal insulation

The test specimens from casing and thermal insulation shall be taken in accordance with prEN 17415-2.

5.3 Steel parts
5.3.1 General
This clause describes the type test and production test of the steel parts.

Test loads in accordance with Table B.1 shall be applied to valves intended for both steel and plastic

service pipe systems and in accordance with Table B.2 to valves intended only for plastic service pipe

systems.

Where Table B.1 is specified in Clause 5.3.2, the specification shall be replaced by Table B.2 for valves

intended only for plastic service pipe systems.
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5.3.2 Type test of the steel parts
5.3.2.1 General

The type test shall be carried out on the same valve for the whole test sequence and executed in the

order given in Table 2. The mandatory clauses shall be carried out as a minimum in the test program.

Table 2 — Overview and sequence of the type test program
Test sequence Name of the test
Mandatory Optional
clauses clauses
5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.5 Axial compressive force test
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.6 Axial tensile force test
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.7 Bending test
5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve
5.3.2.3 Leak-tightness
...

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