Thermoplastics piping and ducting systems - Joints for buried non-pressure applications - Test method for the long-term sealing performance of joints with elastomeric seals by estimating the sealing pressure

This draft European Standard specifies a method for determination of the long-term sealing pressure of elastomeric seals in assembled joints for buried non-pressure sewerage plastics piping and ducting systems.

Rohrleitungs- und Schutzrohrsysteme aus Thermoplasten - Verbindungen für erdverlegte drucklose Anwendungen - Prüfverfahren für das Langzeit-Dichtverhalten von Verbindungen mit Elastomer-Dichtungen durch Abschätzung des Dichtdrucks

Systemes de canalisations et de gaines en thermoplastiques - Assemblages pour applications enterrées sans pression - Méthode d'essai pour la performance a long terme des assemblages avec garnitures d'étanchéité en élastomere par l'estimation de la pression d'étanchéité

La présente Norme européenne spécifie une méthode permettant de déterminer la pression d'étanchéité a long terme des garnitures d'étanchéité en élastomere des assemblages de systemes de canalisations et de gaines en plastiques sans pression et enterrés.

Thermoplastics piping and ducting systems - Joints for buried non-pressure applications - Test method for the long-term sealing performance of joints with elastomeric seals by estimating the sealing pressure

General Information

Status
Published
Publication Date
31-Mar-2006
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Apr-2006
Due Date
01-Apr-2006
Completion Date
01-Apr-2006

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SLOVENSKI STANDARD
SIST EN 14741:2006
01-april-2006
1DGRPHãþD
SIST EN 1989:2002
Thermoplastics piping and ducting systems - Joints for buried non-pressure
applications - Test method for the long-term sealing performance of joints with
elastomeric seals by estimating the sealing pressure

Thermoplastics piping and ducting systems - Joints for buried non-pressure applications

- Test method for the long-term sealing performance of joints with elastomeric seals by

estimating the sealing pressure

Rohrleitungs- und Schutzrohrsysteme aus Thermoplasten - Verbindungen für erdverlegte

drucklose Anwendungen - Prüfverfahren für das Langzeit-Dichtverhalten von
Verbindungen mit Elastomer-Dichtungen durch Abschätzung des Dichtdrucks
Systemes de canalisations et de gaines en thermoplastiques - Assemblages pour

applications enterrées sans pression - Méthode d'essai pour la performance a long

terme des assemblages avec garnitures d'étanchéité en élastomere par l'estimation de la

pression d'étanchéité
Ta slovenski standard je istoveten z: EN 14741:2006
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
SIST EN 14741:2006 en

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

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SIST EN 14741:2006
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SIST EN 14741:2006
EUROPEAN STANDARD
EN 14741
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2006
ICS 23.040.80 Supersedes EN 1989:2000
English Version
Thermoplastics piping and ducting systems - Joints for buried
non-pressure applications - Test method for the long-term
sealing performance of joints with elastomeric seals by
estimating the sealing pressure

Systèmes de canalisations et de gaines en Rohrleitungs- und Schutzrohrsysteme aus Thermoplasten -

thermoplastiques - Assemblages pour applications Verbindungen für erdverlegte drucklose Anwendungen -

enterrées sans pression - Méthode d'essai pour la Prüfverfahren für das Langzeit-Dichtverhalten von

performance à long terme des assemblages avec Verbindungen mit Elastomer-Dichtungen durch

garnitures d'étanchéité en élastomère par l'estimation de la Abschätzung des Dichtdrucks

pression d'étanchéité
This European Standard was approved by CEN on 30 December 2005.

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 Central Secretariat 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 Central Secretariat has the same status as the official

versions.

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

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,

Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14741:2006: E

worldwide for CEN national Members.
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SIST EN 14741:2006
EN 14741:2006 (E)
Contents

Foreword .............................................................................................................................................3

1 Scope ...........................................................................................................................................4

2 Normative references..................................................................................................................4

3 Symbols .......................................................................................................................................4

4 Principle.......................................................................................................................................5

5 Apparatus ....................................................................................................................................5

6 Test pieces...................................................................................................................................6

7 Test procedure ............................................................................................................................7

8 Calculation and expression of the results.................................................................................8

9 Test report .................................................................................................................................10

Annex A (informative) Example of a tube manufacturers specification ......................................12

Annex B (informative) Description of a training test assembly ...................................................13

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SIST EN 14741:2006
EN 14741:2006 (E)
Foreword

This European Standard (EN 14741:2006) has been prepared by Technical Committee CEN/TC 155 “Plastics

piping systems and ducting systems”, the secretariat of which is held by NEN.

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 August 2006, and conflicting national standards shall be withdrawn at

the latest by August 2006.
This document supersedes EN 1989:2000.

The material-dependent parameters and/or performance requirements are incorporated in the System

Standard(s) concerned.

This standard is one of a series of standards on test methods that support System Standards for plastics

piping systems and ducting systems.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom.
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SIST EN 14741:2006
EN 14741:2006 (E)
1 Scope

This draft European Standard specifies a method for determination of the long-term sealing pressure of

elastomeric seals in assembled joints for buried non-pressure sewerage plastics piping and ducting systems.

2 Normative references

The following referenced documents are indispensable for the application 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 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 1: Vulcanized rubber

EN 681-2, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 2: Thermoplastic elastomers

EN 681-3, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 3: Cellular materials of vulcanized rubber

EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 4: Cast polyurethane sealing elements

EN 837-1:1996, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology,

requirements and testing
EN ISO 9967, Plastics pipes - Determination of creep ratio (ISO 9967:1994)
3 Symbols
B : the theoretical pressure in bar, in the PTFE tube at t = 1 h
D : drop factor of extrapolated pressure data at 24 h and 100 years
M : the gradient of the curve

p : pressure measured in the PTFE tube at a flow of 120 ml/min and the time t hours

p : initial leakage pressure in bar, measured in the PTFE tube after completing the assembly

p , p , p : pressure measured in the 3 PTFE tubes in the tested joint marked a, b or c respectively at the

t t t
a b c
time t hours
p : extrapolated pressure in bar at 100 years
p : calculated pressure in bar at 24 h

p , p , p : extrapolated pressure in bar at 100 years in the 3 PTFE tubes in the tested joint marked a, b

xa xb xc
or c respectively.

p : the arithmetic mean value of the pressures obtained for each of the three extrapolated values

100 y
p at 100 years
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SIST EN 14741:2006
EN 14741:2006 (E)

p : the arithmetic mean value of the pressures obtained for each of the three calculated values p

24 h y
at 24 h
R : correlation coefficient
t : time in hours
4 Principle

The sealing pressure in a joint is estimated by measuring the pressure, necessary to lift the seal, in each of 3

PTFE tubes equally distributed over the circumference of a joint located between the rubber seal and the

spigot or socket as appropriate, see Figure 1.

In a temperature controlled environment and at increasing time intervals, a constant flow rate of 120 ml/min

nitrogen or air is forced through 3 flexible PTFE tubes.

The nitrogen or air pressure p, necessary to achieve this flow, is measured. The pressure p is measured at

increasing time intervals over a period of time. The extrapolated regression lines for p are used to calculate

the estimated value p at 100 years and p at 24 h.
x y
5 Apparatus
Key

A Source of nitrogen or clean air F Position of the tube in a joint with the sealing ring positioned on the spigot

B Regulator/pressure controller G Test assembly base

C Pressure gauge H Position of the tube in a joint with sealing ring positioned in the socket

D Fixed coupler J Connecting tube
E PTFE tube K Flow meter
Figure 1 — Typical arrangement of the test assembly
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SIST EN 14741:2006
EN 14741:2006 (E)

5.1 A source of nitrogen, with a purity of at least 99,8%, or alternatively, cleaned air (oil free) both capable

of supplying a flow of up to 200 ml/min and at a pressure of at least 10 bar .

5.2 Regulator/pressure controller, capable of regulating a stable pressure and flow increase up to

120 ml/min.

5.3 Pressure gauge, for measuring the pressure in the main line and capable of checking conformity to 7.2

(class 0,6 or better as specified in EN 837-1:1996).
5.4 Connecting tube, with an inside diameter of at least 4 mm.
5.5 PTFE tube, conforming to the following:
capable of sustaining at least 10 bar pressure.

the total thickness of the flattened PTFE tube shall be between 0,16 mm and 0,24 mm, measured in the

middle of the sample and carried out in two positions perpendicular to each other.

the total width of the flattened tube shall be between 6 mm and 10 mm.

NOTE The PTFE tube used for this test is a blown-up tube, normally applied as a shrinkage tube.

The original diameter and wall thickness after shrinkage are normally specified. The attention is drawn that the blown-up

dimensions are normally not specified. Care should be taken that the wall thickness and the diameter of the tube as

received are verified. The given tolerances should be seen as a guide for the supplier.

5.6 Flow meter, with a capacity of 200 ml/min and a tolerance of ± 5 ml/min

5.7 Means for storage of the test assembly, capable of fixing and storing the test assembly in such a way

that no additional movements in the joint can occur. It shall be capable of fixing the PTFE tubes in such a way

that during connecting or disconnecting to the pressure gauge and flow meter, no movement of the PTFE tube

in the sealing area can occur.

5.8 Lubricant, an aerosol of silicon (Polydimethylsiloxanoil) with gas propellant (Propane/Butane).

6 Test pieces
6.1 General

Each test piece shall consist of a complete joint, together with its elastomeric seal and PTFE tube(s). Unless

otherwise specified in the referring standard, the number of PTFE tubes shall be three, marked as a, b and c,

equally spaced around the spigot.
6.2 Assembly

Prior to assembly, the test pieces shall be conditioned at the test temperature for at least 24 h.

Clean the rubber sealing ring, the socket and the spigot.

Prepare the PTFE tube by pressing it together several times until permanently flattened and place it along the

smooth surface of the spigot or socket.
1 5 2
1 bar = 10 N/m
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SIST EN 14741:2006
EN 14741:2006 (E)

Lubricate the smooth wall in the joint (spigot or socket), the seal and PTFE tube(s). The lubricant as defined in

5.8 shall be used. Use sufficient lubricant to ensure that the PTFE shrinkage tube(s) and seal can be

assembled without damage, and the seal can equalise its position within the groove circumference.

Assemble the socket and spigot, including the seal, in accordance with the manufacturer's instructions and the

following requirements.

a) The joint shall be assembled in such a way that the PTFE tubes are mounted between the spigot or

socket and the seal (see Figure 1); precaution shall be taken to avoid squeezing of the PTFE tube outside

the sealing area.

It is permitted to mill a grove, insert thin plastics strips along the tube, drill holes in the spigot or socket or

any other method to give room for sufficient flow through the tube outside the sealing area. The method

selected shall not significantly influence the creep behaviour of the joint in the sealing housing area.

b) Make sure that the PTFE tube can move freely in the axial direction and that the

...

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