Determination of the resistance to cryogenic spillage of insulation materials - Part 3: Jet release (ISO 20088-3:2018)

This part of ISO 20088 describes a method for determining the resistance to cryogenic spray on Cryogenic Spillage Protection (CSP) systems. It is applicable where CSP systems are installed on carbon steel and will be in contact with cryogenic fluids. Liquid jet release is potentially formed at high pressure LNG handling section in LNG liquefaction unit, e.g., around 40 - 60 bar operating pressure. Due to high velocity discharge, it may cause severe condition for cryogenic protection coating by large momentum with extreme cryogenic temperature. Liquid nitrogen is used as the cryogenic medium since it has a lower boiling point than liquid natural gas or liquid oxygen and it is not flammable. Additionally, it can be safely used for experiment.

Bestimmung der Beständigkeit von Isoliermaterialien bei kryogenem Auslaufen - Teil 3: Freisetzung von Hochdruckstrahlen (ISO 20088-3:2018)

Dieses Dokument beschreibt ein Verfahren zur Bestimmung des Widerstands von CSP-Systemen (en: cryogenic spill protection, CSP; de: Schutz gegen kryogenen Auslauf) gegen kryogene Strahlen als Folge einer Freisetzung unter Druck, die nicht zu Eintauchbedingungen führt. Es ist anwendbar, wenn CSP-Systeme auf Kohlenstoffstahl installiert sind und mit kryogenen Flüssigkeiten in Kontakt kommen.
Ein kryogener Strahl kann durch Freisetzung aus Prozessanlagen, die unter Druck stehen, entstehen (z. B. nutzen einige Verflüssigungsprozesse einen Betriebsdruck von 40 bis 60 bar). Aufgrund der hohen Druckentlastung kann der Schutz gegen kryogenen Auslauf durch den großen Impuls in Kombination mit der extremen kryogenen Temperatur beeinträchtigt werden.
Obwohl in der Prüfung flüssiger Stickstoff als kryogene Flüssigkeit verwendet wird, gilt die in diesem Dokument beschriebene Prüfung als repräsentativ für eine Freisetzung von Flüssigerdgas durch eine Öffnung mit einer Breite von 20 mm oder kleiner bei einer Druckentlastung von 6 barg oder weniger basierend auf simulierten Parametern 1 m von der Auslaufstelle entfernt. Das Vertrauen für die Repräsentativität dieser Prüfung basiert auf einem Vergleich zwischen dem erwarteten dynamischen Druck der simulierten Freisetzung und dem dynamischen Druck der Freisetzung in Übereinstimmung mit diesem Dokument.
Bei dieser Prüfung ist es nicht praktikabel, den gesamten Bereich der unter realen Anlagenbedingungen auftretenden kryogenen Prozessbedingungen abzudecken; insbesondere deckt die Prüfung keine Freisetzungen von kryogenen Hochdruckstrahlen ab, die in Kühlkreisläufen und in LNG-Strömen unmittelbar nach der Verflüssigung vorzufinden sind.
Als kryogenes Medium wird flüssiger Stickstoff genutzt, da das Material bei den in diesem Dokument beschriebenen Drücken sicher gehandhabt werden kann. Die Prüfung wird bei einem nominalen Druck von 8 barg durchgeführt.
ISO 20088 1 deckt Szenarien einer kryogenen Freisetzung ab, die zu Poolbildungsbedingungen bei Stahlteilen, die gegen kryogenen Auslauf als Folge einer Freisetzung von Strahlen oder einer Niederdruckfreisetzung von Flüssigerdgas oder flüssigem Stickstoff geschützt sind, führen können. ISO 20088 2 deckt Expositionsbedingungen der Dampfphase als Folge einer Strahlfreisetzung oder einer Niederdruckfreisetzung von Flüssigerdgas oder flüssigem Stickstoff ab.

Détermination de la résistance des matériaux d'isolation thermique suite à un refroidissement cryogénique - Partie 3: Émission sous forme de jet (ISO 20088-3:2018)

Ugotavljanje obstojnosti izolacijskih materialov pri puščanju v kriogenem območju - 3. del: Visokotlačni curek (ISO 20088-3:2018)

Ta del standarda ISO 20088 opisuje metodo za ugotavljanje obstojnosti na kriogeno pršenje v sistemih za zaščito pred puščanjem v kriogenem območju (CSP). Uporablja se, kadar so sistemi za zaščito pred puščanjem v kriogenem območju nameščeni na ogljikovo jeklo in bodo v stiku s kriogenimi tekočinami. Visokotlačni curek tekočine potencialno nastane v območju za rokovanje z utekočinjenim zemeljskim plinom (LNG) v enoti za utekočinjanje zemeljskega plina, npr. okoli 40–60 barov delovnega tlaka. Zaradi visoke hitrosti izpusta lahko povzroči težke pogoje za kriogeno zaščitno prevleko z velikim momentom in ekstremno kriogeno temperaturo. Kot kriogeni medij se uporablja tekoči dušik, saj ima nižje vrelišče kot tekoči zemeljski plin ali tekoči kisik in ni vnetljiv. Prav tako ga je mogoče varno uporabiti za preizkus.

General Information

Status
Published
Public Enquiry End Date
04-May-2019
Publication Date
02-Dec-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
06-Nov-2019
Due Date
11-Jan-2020
Completion Date
03-Dec-2019

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SLOVENSKI STANDARD
SIST EN ISO 20088-3:2020
01-januar-2020

Ugotavljanje obstojnosti izolacijskih materialov pri puščanju v kriogenem območju

- 3. del: Visokotlačni curek (ISO 20088-3:2018)

Determination of the resistance to cryogenic spillage of insulation materials - Part 3: Jet

release (ISO 20088-3:2018)

Bestimmung der Beständigkeit von Isoliermaterialien bei kryogenem Auslaufen - Teil 3:

Freisetzung von Hochdruckstrahlen (ISO 20088-3:2018)
Détermination de la résistance des matériaux d'isolation thermique suite à un

refroidissement cryogénique - Partie 3: Émission sous forme de jet (ISO 20088-3:2018)

Ta slovenski standard je istoveten z: EN ISO 20088-3:2019
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
SIST EN ISO 20088-3:2020 en,fr,de

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

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SIST EN ISO 20088-3:2020
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SIST EN ISO 20088-3:2020
EN ISO 20088-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 75.200
English Version
Determination of the resistance to cryogenic spillage of
insulation materials - Part 3: Jet release (ISO 20088-
3:2018)

Détermination de la résistance des matériaux Bestimmung der Beständigkeit von Isoliermaterialien

d'isolation thermique suite à un refroidissement bei kryogenem Auslaufen - Teil 3: Freisetzung von

cryogénique - Partie 3: Émission sous forme de jet (ISO Hochdruckstrahlen (ISO 20088-3:2018)

20088-3:2018)
This European Standard was approved by CEN on 5 August 2019.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20088-3:2019 E

worldwide for CEN national Members.
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SIST EN ISO 20088-3:2020
EN ISO 20088-3:2019 (E)
Contents Page

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

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SIST EN ISO 20088-3:2020
EN ISO 20088-3:2019 (E)
European foreword

The text of ISO 20088-3:2018 has been prepared by Technical Committee ISO/TC 67 "Materials,

equipment and offshore structures for petroleum, petrochemical and natural gas industries” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 20088-3:2019

by Technical Committee CEN/TC 282 “Installation and equipment for LNG” the secretariat of which is

held by AFNOR.

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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

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.

According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Endorsement notice

The text of ISO 20088-3:2018 has been approved by CEN as EN ISO 20088-3:2019 without any

modification.
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SIST EN ISO 20088-3:2020
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SIST EN ISO 20088-3:2020
INTERNATIONAL ISO
STANDARD 20088-3
First edition
2018-11
Determination of the resistance
to cryogenic spillage of insulation
materials —
Part 3:
Jet release
Détermination de la résistance des matériaux d'isolation thermique
suite à un refroidissement cryogénique —
Partie 3: Émission sous forme de jet
Reference number
ISO 20088-3:2018(E)
ISO 2018
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Test configurations ............................................................................................................................................................................................. 2

4.1 General ........................................................................................................................................................................................................... 2

5 Construction of the test apparatus and substrates ........................................................................................................... 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Material ......................................................................................................................................................................................................... 3

5.3 Release nozzle.......................................................................................................................................................................................... 3

5.3.1 Nozzle construction ...................................................................................................................................................... 3

5.3.2 Nozzle position .................................................................................................................................................................. 4

5.4 Specimen support ................................................................................................................................................................................. 4

5.5 Recirculation chamber ..................................................................................................................................................................... 6

6 Cryogenic spill protection materials ............................................................................................................................................... 6

6.1 General ........................................................................................................................................................................................................... 6

6.2 Wet applied coating systems ....................................................................................................................................................10

6.3 Preformed system testing ...........................................................................................................................................................10

7 Instrumentation for test specimens ..............................................................................................................................................10

7.1 General ........................................................................................................................................................................................................10

7.2 Thermocouple location .................................................................................................................................................................10

8 Test environment ..............................................................................................................................................................................................10

9 Test procedure .....................................................................................................................................................................................................12

10 Repeatability and reproducibility ...................................................................................................................................................13

11 Uncertainty of measurement ................................................................................................................................................................13

12 Test report ................................................................................................................................................................................................................13

13 Practical applications of test results .............................................................................................................................................14

13.1 General ........................................................................................................................................................................................................14

13.2 Performance criteria .......................................................................................................................................................................14

13.2.1 General...................................................................................................................................................................................14

13.2.2 Coatings and spray-applied materials ........................................................................................................15

13.2.3 Systems and assemblies .........................................................................................................................................15

13.3 Factors affecting the validity of the test .........................................................................................................................15

13.3.1 General...................................................................................................................................................................................15

13.3.2 Failure at nozzle ............................................................................................................................................................15

13.3.3 Failure of thermocouples .................. .....................................................................................................................15

Annex A (normative) Methods of fixing thermocouples ...............................................................................................................17

Annex B (normative) Complete set-up ............................................................................................................................................................18

Annex C (informative) Classification .................................................................................................................................................................21

Bibliography .............................................................................................................................................................................................................................23

© ISO 2018 – All rights reserved iii
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore

structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 9, Liquefied natural

gas installations and equipment.
A list of all parts in the ISO 20088 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Introduction

The test is intended to be, as far as practicable, representative of a potential accidental pressurized

release of cryogenic liquid natural gas (LNG) manufactured in industrial plants. The test includes:

a) an initial enhanced cooling effect due to the momentum driven liquid contact with the substrate;

b) a localized force that may be expected in a cryogenic jet release.

This test is designed to give an indication of how cryogenic spill protection systems will perform when

subjected to a sudden cryogenic jet release.

The dimensions of the test specimen might be smaller than typical items of structure and plant. The

liquid cryogenic jet mass flow rates can be substantially less than that which might occur in a credible

event. However, the thermal and mechanical loads imparted to the cryogenic spill protection systems

from the cryogenic jet release, described in this document, are representative of a cryogenic LNG jet

release with hole size 20 mm or less and release pressure less than or equal to 6 barg.

© ISO 2018 – All rights reserved v
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SIST EN ISO 20088-3:2020
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SIST EN ISO 20088-3:2020
INTERNATIONAL STANDARD ISO 20088-3:2018(E)
Determination of the resistance to cryogenic spillage of
insulation materials —
Part 3:
Jet release

CAUTION — The attention of all persons concerned with managing and carrying out cryogenic

spill tests is drawn to the fact that liquid nitrogen testing can be hazardous and that there is a

danger of condensing liquid oxygen (fire/explosion), receiving a ‘cold burn’ and/or the possibility

that harmful gases (risk of anoxia) can be evolved during the test. Mechanical and operational

hazards can also arise during the construction of the test elements or structures, their testing

and disposal of test residues. An assessment of all potential hazards and risks to health shall

be made and safety precautions identified and provided. Appropriate training and Personal

Protection Equipment shall be given to relevant personnel. The test laboratory is responsible for

conducting an appropriate risk assessment in order to consider the impact of liquid and gaseous

nitrogen exposure to equipment, personnel and the environment.
1 Scope

This document describes a method for determining the resistance of a cryogenic spill protection

(CSP) system to a cryogenic jet as a result of a pressurized release which does not result in immersion

conditions. It is applicable where CSP systems are installed on carbon steel and will be in contact with

cryogenic fluids.

A cryogenic jet can be formed upon release from process equipment operating at pressure (e.g. some

liquefaction processes utilize 40 to 60 bar operating pressure). Due to high pressure discharge, the

cryogenic spillage protection can be compromised by the large momentum combined with extreme

cryogenic temperature.

Although the test uses liquid nitrogen as the cryogenic liquid, the test described in this document

is representative of a release of LNG, through a 20 mm orifice or less, at a release pressure of 6 barg

or less, based upon simulated parameters 1 m from the release point. Confidence in this test being

representative is based upon a comparison of the expected dynamic pressure of the simulated release

in comparison with dynamic pressure from releases in accordance with this document.

It is not practical in this test to cover the whole range of cryogenic process conditions found in real

plant conditions; in particular the test does not cover high pressure cryogenic jet releases that might be

found in refrigeration circuits and in LNG streams immediately post-liquefaction.

Liquid nitrogen is used as the cryogenic medium due to the ability to safely handle the material at the

pressures described in this document. The test condition is run at nominally 8 barg pressure.

ISO 20088-1 covers cryogenic release scenarios which can lead to pooling conditions for steel work

protected by cryogenic spill protection as a result of a jet release or low pressure release of LNG or

liquid nitrogen. ISO 20088-2 covers vapour phase exposure conditions as a result of a jet release or low

pressure release of LNG or liquid nitrogen.
2 Normative references
There are no normative references in this document.
© ISO 2018 – All rights reserved 1
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
cryogenic jet release
unintended exposure to cryogenic liquid as a result of a pressurized release
3.2
cryogenic spill protection
CSP

coating or cladding arrangement, or free-standing system which, in the event of a cryogenic jet release,

will provide insulation to restrict the heat transfer rate from the substrate
3.3
limiting temperature

minimum temperature that the equipment, assembly or structure to be protected may be allowed to reach

3.4
nozzle
assembly from which the cryogenic liquid is released as a jet
3.5
sponsor
person or organization that requests a test
3.6
specimen owner
person or company that holds/produces a material to test
4 Test configurations
4.1 General

The configuration under which the test is conducted is where the specimen is placed horizontally at

height on suitable supports. The test piece is impacted at the mid-point by a horizontal liquid nitrogen

cryogenic jet release. Due to safety concerns, it is proposed that the test should only be performed

outside, unless there are sufficient safeguards implemented to mitigate the confined space and liquid

nitrogen safety risks.
5 Construction of the test apparatus and substrates
5.1 General
The key items required for the test are:

— a nozzle and cryogenic liquid feeder assembly where the temperature and pressure of the liquid can

be measured at the point the liquid enters the reducing diameter pipe to the nozzle;

— liquid nitrogen of sufficient volume for the test duration supplied from a tanker capable of offload

via a pump to generate the required stable pressure at the nozzle;
— a carbon steel specimen protected with CSP;
2 © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)

— thermocouples to determine the temperature as a function of time in the steel specimen.

5.2 Material

The steel grade used for the test is to be recorded. Where welded plate girders are used, construction is

to be representative of the as-built structure. All dimensions are in millimetres and, unless otherwise

stated, the following tolerances shall be used:
— whole number ± 1,0 mm;
— decimal to point ,0 ± 0,4 mm;
— decimal to point ,00 ± 0,02 mm;
— angles ± 0’ 30”;
— radius ± 0,4 mm.

Test specimens shall include as a minimum a beam of designation 406 mm × 178 mm × 60 kg/m

or tubular specimen of wall thickness 6,3 mm and outer diameter between 270 mm and 350 mm

(including the cryogenic spill protection material). All test specimens are to be 2,5 m in length unless

otherwise agreed by the sponsor.
5.3 Release nozzle
5.3.1 Nozzle construction

Liquid nitrogen is released towards the specimen from a nozzle as shown in Figure 1. The nozzle shall

be of length (150 ± 1,0) mm, constructed from 10 mm nominal diameter stainless steel pipe with

outside diameter of 20 mm to 30 mm, -0,5/+0,5 mm giving a wall thickness between 5 mm and 10 mm.

The nozzle shall not be tapered and the end shall be clean cut with no chamfering of pipe walls. The

nozzle is fed with liquid nitrogen from a 52,5 mm diameter schedule 40 stainless steel pipe gradually

reducing in internal diameter to 10 mm over a length of 200 mm to 250 mm.
© ISO 2018 – All rights reserved 3
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Dimensions in millimetres
Key
1 welds
2 slip-on flange
3 reducing section
4 butt weld
5 straight-sided nozzle

Figure 1 — Feed pipe and nozzle construction with a nozzle of 10 mm wall thickness

5.3.2 Nozzle position

The nozzle shall be positioned horizontally in front of the test specimen, focussed at the centre point

such that the cryogenic jet release impacts normal to the web of the beam [dry film thickness (DFT)

measurement point 7] or normal to a tangent drawn where the radius of the tube intersects the centre

point of the tubular (DFT measurement point 3) as shown in Figure 4. The tip of the nozzle shall be

located (500 ± 10) mm from the protected surface of the test specimen as shown in Figure 2.

5.4 Specimen support

A generic support shall be used to hold and support the test specimen. The support shall be fabricated

from a material resistant to cryogenic temperatures. It is the responsibility of the test laboratory to

ensure proper design of such an item and to ensure that pool formation of cryogenic liquid cannot occur

and come in contact with the sample (for tubular specimens, no liquid should be allowed to enter the

inside of the specimen). An example is given in Figure 2 with more detailed figures showing the overall

test configuration in Annex B.
4 © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Dimensions in millimetres
a) Beam configuration (side view — including environmental chamber)
b) Pipe configuration (side view — including environmental chamber)
Key
1 environmental chamber
2 release nozzle (8 ± 0,8) barg (average pressure ±standard deviation)
3 specimen (beam shown)
4 specimen (and recirculation and protective chambers) supports
5 recirculation chamber (insulated on back surface)
6 protective chamber (support and stability)
7 specimen (tubular shown)
Figure 2 — Example of specimen support and side view configuration
© ISO 2018 – All rights reserved 5
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
5.5 Recirculation chamber

A recirculation chamber as shown in Figure 3 shall be placed behind the specimen to provide the means

to standardize the atmospheric test environment. Insulation board (U Value maximum 1,25 W/m .K) is

to be affixed to the rear of the recirculation chamber. To provide extra support and stability, a steel box

is to be attached to the rear of the recirculation chamber as shown in Figure 2 (refer to ISO 22899-1).

Dimensions in millimetres
Thirteen holes drilled ∅18.
Figure 3 — Recirculation chamber
6 Cryogenic spill protection materials
6.1 General

CSP systems generally come in two forms; wet applied materials/coatings and preformed systems.

Preformed systems include boards, tiles, blankets, sandwich panels, etc., and are characterized by

systems that include joints and fixings. Preformed systems may be used in conjunction with wet applied

materials.
6 © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)

The application/installation methodology, including any necessary surface preparation, reinforcement,

thickness, top-coats, field joints, etc., is to be determined by the sponsor and/or specimen owner and

details provided for inclusion within the test report.

The thickness for sprayed applied systems shall be measured as close as practicable to the positions

identified in Figure 4, avoiding readings directly over thermocouples wires which may give false

readings. For preformed systems, thicknesses shall be measured for the system components at

locations on the specimen corresponding to those shown in Figure 4. If there are clear signs of thinning

or thickening at positions away from those indicated for measurement, additional measurements

should be taken and reported.
© ISO 2018 – All rights reserved 7
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
Dimensions in millimetres
a) Beam DFT measurement locations
8 © ISO 2018 – All rights reserved
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SIST EN ISO 20088-3:2020
ISO 20088-3:2018(E)
b) Tubular DFT measurement locations
Key
1 recirculation chamber
2 beam sample
3 pipe sample
Top.
Exposed face.
Bottom.
Unexposed face.
Centre line.
Exposed face centre line.
...

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