SIST EN ISO 20088-2:2020
(Main)Determination of the resistance to cryogenic spill of insulation materials - Part 2: Vapour exposure (ISO 20088-2:2020)
Determination of the resistance to cryogenic spill of insulation materials - Part 2: Vapour exposure (ISO 20088-2:2020)
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. Part 2 of the standard covers vapour phase exposure conditions. The test laboratory is responsible to conduct an appropriate risk assessment according to local regulation in order to consider the impact of liquid and gaseous nitrogen exposure to equipment and personnel.
Bestimmung der Beständigkeit von Isoliermaterialien bei kryogenem Auslaufen - Teil 2: Dampfphase (ISO 20088-2:2020)
Dieses Dokument beschreibt ein Verfahren zur Bestimmung des Widerstands von CSP-Systemen (Schutz gegen kryogenen Auslauf, en: cryogenic spill protection) gegen Dampf, der aus einer Freisetzung einer kryogenen Flüssigkeit entsteht, wobei der Flüssigkeitsgehalt praktisch null ist. Es ist anwendbar, wenn CSP-Systeme auf Kohlenstoffstahl installiert sind.
Die Freisetzung von Flüssigkeitsstrahlen kann durch Freisetzung von verflüssigtem Erdgas (LNG, en: Liquified Natural Gas) aus Prozessanlagen, die unter Druck stehen, entstehen, z. B. nutzen einige Verflüssigungsprozesse einen Betriebsdruck von 40 – 60 bar. Jedoch wird in bestimmten Abständen vom Freisetzungspunkt erwartet, dass der Flüssigkeitsanteil so abnimmt, dass eine Flüssigkeitskühlung im Strom praktisch keine Auswirkung hat.
Es sollte beachtet werden, dass es bei dieser Prüfung nicht praktikabel ist, den gesamten Bereich der unter realen Anlagenbedingungen auftretenden kryogenen Prozessbedingungen abzudecken; insbesondere deckt die Prüfung keine Freisetzungen von kryogenen Hochdruckflüssigkeiten ab, die in Kühlkreisläufen und in LNG-Strömen unmittelbar nach der Verflüssigung vorzufinden sind.
Als kryogenes Medium wird flüssiger Stickstoff (LN2) genutzt, da das Material bei den in dieser Norm beschriebenen Drücken sicher gehandhabt werden kann.
ISO 20088-1 deckt die Freisetzung von kryogenen Flüssigkeiten ab, die bei durch CSP geschützten Stahlarbeiten zu einer Flüssigkeitsansammlung führen können. ISO 20088-3 deckt strahlförmige Freisetzungsbedingungen ab, unter denen im Strom Flüssigkeit vorherrschend ist.
Détermination de la résistance des matériaux d'isolation thermique suite à un refroidissement cryogénique - Partie 2: Phase vapeur (ISO 20088-2:2020)
Le présent document décrit une méthode pour déterminer la résistance de systèmes de protection contre la fuite cryogénique (CSP) à la vapeur générée par une émission de liquide cryogénique dont la teneur en liquide est quasi-nulle. Cette méthode s'applique quand des systèmes CSP sont installés sur de l'acier au carbone.
L'essai fourni dans ce document ne couvre pas les émissions de liquide cryogénique sous haute pression que l'on peut trouver dans les circuits de réfrigération et dans les courants de GNL immédiatement après la liquéfaction.
Ugotavljanje obstojnosti izolacijskih materialov pri puščanju v kriogenem območju - 2. del: Izpostavljenost pari (ISO 20088-2:2020)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 20088-2:2020
01-junij-2020
Ugotavljanje obstojnosti izolacijskih materialov pri puščanju v kriogenem območju
- 2. del: Izpostavljenost pari (ISO 20088-2:2020)
Determination of the resistance to cryogenic spill of insulation materials - Part 2: Vapour
exposure (ISO 20088-2:2020)
Bestimmung der Beständigkeit von Isoliermaterialien bei kryogenem Auslaufen - Teil 2:
Dampfphase (ISO 20088-2:2020)
Détermination de la résistance des matériaux d'isolation thermique suite à un
refroidissement cryogénique - Partie 2: Phase vapeur (ISO 20088-2:2020)
Ta slovenski standard je istoveten z: EN ISO 20088-2:2020
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
SIST EN ISO 20088-2:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 20088-2:2020
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SIST EN ISO 20088-2:2020
EN ISO 20088-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 75.200
English Version
Determination of the resistance to cryogenic spill of
insulation materials - Part 2: Vapour exposure (ISO 20088-
2:2020)
Détermination de la résistance des matériaux Bestimmung der Beständigkeit von Isoliermaterialien
d'isolation thermique suite à un refroidissement bei kryogenem Auslaufen - Teil 2: Dampfphase (ISO
cryogénique - Partie 2: Phase vapeur (ISO 20088- 20088-2:2020)
2:2020)
This European Standard was approved by CEN on 31 March 2020.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20088-2:2020 E
worldwide for CEN national Members.
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SIST EN ISO 20088-2:2020
EN ISO 20088-2:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 20088-2:2020
EN ISO 20088-2:2020 (E)
European foreword
This document (EN ISO 20088-2:2020) has been prepared by Technical Committee ISO/TC 67/SC 9
"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"
in collaboration with 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 October 2020, and conflicting national standards shall
be withdrawn at the latest by October 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 20088-2:2020 has been approved by CEN as EN ISO 20088-2:2020 without any
modification.
3
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SIST EN ISO 20088-2:2020
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SIST EN ISO 20088-2:2020
INTERNATIONAL ISO
STANDARD 20088-2
First edition
2020-01
Determination of the resistance
to cryogenic spill of insulation
materials —
Part 2:
Vapour exposure
Détermination de la résistance des matériaux d'isolation thermique
suite à un refroidissement cryogénique —
Partie 2: Phase vapeur
Reference number
ISO 20088-2:2020(E)
©
ISO 2020
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
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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 2020 – All rights reserved
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test configurations . 2
5 Construction of the test apparatus and substrates . 2
5.1 Apparatus . 2
5.2 Materials and tolerances . 3
5.3 Release nozzle. 3
5.3.1 Nozzle construction . 3
5.3.2 Nozzle position . 4
5.4 Test assembly supports . 4
5.5 Test specimen and recirculation chamber . 4
6 Cryogenic spill protection materials . 5
6.1 General . 5
6.2 Wet applied coating systems . 6
6.3 Preformed system testing . 6
7 Instrumentation for test specimens . 6
7.1 General . 6
7.2 Thermocouple location . 6
8 Test environment . 7
9 Test procedure . 7
10 Repeatability and reproducibility . 8
11 Uncertainty of measurement . 8
12 Test report . 8
13 Practical applications of test results . 9
13.1 General . 9
13.2 Performance criteria .10
13.2.1 General.10
13.2.2 Coatings and spray-applied materials — Substrate temperature .10
13.2.3 Systems and assemblies .10
13.3 Factors affecting the validity of the test .11
13.3.1 General.11
13.3.2 Failure at nozzle .11
13.3.3 Failure of thermocouples . .11
Annex A (normative) Methods for fixing thermocouples .12
Annex B (informative) Classification .13
Bibliography .15
© ISO 2020 – All rights reserved iii
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 282, Installation and equipment for LNG, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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 2020 – All rights reserved
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
Introduction
The test is intended to be, as far as practicable, representative of a potential accidental pressurised
release of cryogenic LNG material manufactured in industrial plants. The test includes
a) release from of cryogenic liquid under pressure, and
b) scenarios where the conditions in the jet characterized predominantly by gaseous exposure.
Liquid jet release may be formed upon release of Liquified Natural Gas (LNG) from process equipment
operating at pressure, e.g., some liquefaction processes utilise 40 - 60 bar operating pressure. However,
at specific distances from the release point, it is expected that the liquid fraction will diminish such
that there is practically no effect from liquid cooling in the stream.
This test is designed to give an indication of how cryogenic spill protection materials will perform in a
sudden exposure to cryogenic jet where it is expected that little or no liquid fraction is present.
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, individual thermal loads imparted to the cryogenic spill protection materials, from
the cryogenic release defined in the procedure described in this document, have been shown to
be representative of areas exposed to a cryogenic LNG accidental release where little or no liquid is
present.
© ISO 2020 – All rights reserved v
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SIST EN ISO 20088-2:2020
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SIST EN ISO 20088-2:2020
INTERNATIONAL STANDARD ISO 20088-2:2020(E)
Determination of the resistance to cryogenic spill of
insulation materials —
Part 2:
Vapour exposure
CAUTION — The attention of all persons concerned with managing and carrying out cryogenic
spill testing is drawn to the fact that liquid nitrogen testing can be hazardous and that there is a
danger of oxygen condensation (risk of 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
shall be identified and provided. Appropriate training and Personal Protection Equipment (PPE)
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 Cryogenic Spill Protection (CSP)
systems to vapour generated from a cryogenic liquid release where the liquid content is practically
zero. It is applicable where CSP systems are installed on carbon steel.
The test provided in this document is not applicable to high pressure cryogenic liquid releases that can
be found in refrigeration circuits and in LNG streams immediately post-liquefaction.
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.
ISO 22899-1, Determination of the resistance to jet fires of passive fire protection materials — Part 1:
General requirements
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/
© ISO 2020 – All rights reserved 1
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
3.1
cryogenic spill protection
CSP
coating or cladding arrangement, or free-standing system which, in the event of a cryogenic jet release,
provides insulation to restrict the heat transfer rate from the substrate
3.2
limiting temperature
minimum temperature that the equipment, assembly or structure that is protected can reach
3.3
nozzle
assembly from which the cryogenic liquid is released as a jet
3.4
sponsor
person or organization who/which requests a test
3.5
specimen owner
person or company that holds or produces a material to test
3.6
cooling power
2
amount of heat transferred per unit area per unit time from a surface (W/m )
4 Test configurations
The test is conducted with the plate specimen placed vertically. The material to be tested is exposed
to a liquid nitrogen release under pressure where the liquid fraction is practically zero (i.e. gaseous
exposure). Due to safety concerns, the test should only be performed outside unless there are sufficient
safeguards implemented to mitigate the confined space and LN (liquid nitrogen) safety risks.
2
5 Construction of the test apparatus and substrates
5.1 Apparatus
The key items required for the test are the following.
5.1.1 Nozzle and cryogenic liquid feed assembly, where the temperature and pressure of the liquid
can be measured at the point the liquid enters the nozzle.
5.1.2 Environmental chamber, (3-sided plastic tunnel) up to a length of 6 m.
5.1.3 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.
5.1.4 Carbon steel specimen, protected with CSP.
5.1.5 Thermocouples, to determine the temperature as a function of time in the steel specimen and
the atmosphere immediately in front of the test specimen.
2 © ISO 2020 – All rights reserved
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
5.2 Materials and tolerances
The steel grade used for the test shall be recorded. Where welded, construction shall be representative
or 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 ±0,2 mm;
— angles ±0’ 30”;
— radius ±0,4 mm.
Test specimen shall be a structural steelwork test specimen as described in ISO 22899-1.
5.3 Release nozzle
5.3.1 Nozzle construction
Liquid nitrogen is released towards the specimen from a nozzle. An example of a suitable nozzle has
the following characteristics. The nozzle of length 150 mm, constructed from a stainless-steel pipe of
nominal diameter 10 mm ± 0,5 mm and of outside diameter 20 mm to 30 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 DN50 diameter schedule 40S
stainless steel pipe, with a machined section reducing in internal diameter to 10 mm over a 250 mm
length as shown in Figure 1.
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
© ISO 2020 – All rights reserved 3
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
5.3.2 Nozzle position
The nozzle shall be positioned horizontally in front of the test specimen, aligned with the centre point
such that the cryogenic release impacts normal to the plate specimen as shown in Figure 2. The tip of
the nozzle shall be located to give the required cooling power described in Clause 8.
EXAMPLE 5 000 mm ± 10 mm from the protected surface of the test specimen when the average outlet
pressure is 8 barg (0,8 MPa) [standard deviation of 0,8 barg (0,08 MPa)] and liquid temperature lower than
°
−170 C (An example of specimen support and side view configuration is shown in Figure 2).
5.4 Test assembly supports
The test assembly shall be supported using material resistant to cryogenic temperatures.
Dimensions in millimetres
Key
1 release nozzle (piping omitted for clarity
2 recirculation chamber (insulated on back surface)
3 protective chamber
4 environmental chamber
5 recirculation chamber and protective chamber supports
Figure 2 — Example of vapour test (side view)
5.5 Test specimen and recirculation chamber
It shall be the primary test piece to which the CSP is applied to the internal surface of the box. Dimension
shall be as described in ISO 22899-1. To provide extra support and stability, the protective chamber
shall be attached to the rear of the recirculation chamber as shown in Figure 3. Insulation board (U
2
Value maximum 1,25 W/m .K) shall be affixed to the rear of the recirculation chamber.
4 © ISO 2020 – All rights reserved
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
Dimensions in millimetres
a
Thirteen holes drilled.
Figure 3 — Recirculation chamber and test sample
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 can be used in conjunction with wet applied
materials.
The application/installation methodology, including any necessary surface preparation, reinforcement,
thickness, top-coats, field joints, etc. shall be determined by the sponsor and/or specimen owner and
details provided for inclusion within the test report.
The thickness shall be measured at the positions specified in Figure 4 for sprayed applied systems. The
measurement positions indicated shall be regarded as approximate. For preformed systems, thickness
shall be measured for the protective layer at locations proximal to those presented 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.
© ISO 2020 – All rights reserved 5
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
Figure 4 — Thickness measurement points for test specimen
6.2 Wet applied coating systems
For CSP systems/materials that are wet applied as coatings, the CSP systems/materials should be
applied in the same manner as will be used in service.
6.3 Preformed system testing
For preformed systems, the system shall also be installed in the same manner as will be used in service.
The method of installing the system shall include representative joints, fixings and wet applied material
interface details; a minimum of two joints should be included as follows.
a) One horizontal joint located over thermocouples: 3, 14 and 4 in Figure 5.
b) One vertical joint located over thermocouples 4, 7, 10 as shown in Figure 5.
Joints should be tested, either in a single test or separate tests, as determined by the sponsor and/or
specimen owner, ensuring the details are representative in accordance with Clause 10.
7 Instrumentation for test specimens
7.1 General
Thermocouples shall be fastened to all test specimens. The type and fixing shall be in accordance with
one of the methods described in Annex A.
Readings shall be recorded at intervals of not more than 1 second.
7.2 Thermocouple location
Thermocouples are positioned as shown in Figure 5. For thermocouple locations shown in red, these
shall be positioned at a distance of 10 mm ± 2 mm away from the test samples (i.e. in the test atmosphere).
Thermocouples shown in black shall be within the steel substrate, as described in Annex A.
6 © ISO 2020 – All rights reserved
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SIST EN ISO 20088-2:2020
ISO 20088-2:2020(E)
Dimension in millimetres
Key
1 thermocouples 13 to 18
2 thermocouples 1 to 12
NOTE Thermocouple locations for specimen. Red thermocouples are in front of the box whereas the black
marks are in relation to thermocouples in the steel.
Figure 5 — Vapour test thermocouple configuration (front view)
8 Test environment
The test shall be preferably operated outdoors. If curing and conditioning is conducted under different
conditions, it shall be clearly stated in the test report.
The test shall be carried out in an environment in which the effects of the weather do not significantly
affect the test and the following conditions shall apply.
— The distance of the nozzle from the test specimen and the pressure measured at the exit of the
schedule 40 feed pipe prior to entry to the nozzle should be such that the thermocouples in front of
an unprotected bare steel back face of the sample reads in the range
...
SLOVENSKI STANDARD
oSIST prEN ISO 20088-2:2019
01-marec-2019
8JRWDYOMDQMHREVWRMQRVWLL]RODFLMVNLKPDWHULDORYSULUD]OLWMXYNULRJHQHPSRGURþMX
GHO 3DUQDID]D ,62',6
Determination of the resistance to cryogenic spill of insulation materials - Part 2: Vapour
phase (ISO/DIS 20088-2:2019)
Bestimmung der Beständigkeit von Isoliermaterialien bei kryogenem Auslaufen - Teil 2:
Dampfphase (ISO/DIS 20088-2:2019)
Détermination de la résistance des matériaux d'isolation thermique suite à un
refroidissement cryogénique - Partie 2: Phase vapeur (ISO/DIS 20088-2:2019)
Ta slovenski standard je istoveten z: prEN ISO 20088-2
ICS:
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
oSIST prEN ISO 20088-2:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 20088-2:2019
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oSIST prEN ISO 20088-2:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 20088-2
ISO/TC 67/SC 9 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2019-01-16 2019-04-10
Determination of the resistance to cryogenic spill of
insulation materials —
Part 2:
Vapour release
Détermination de la résistance des matériaux d'isolation thermique suite à un refroidissement
cryogénique —
Partie 2: Phase gazeuse
ICS: 75.200
Member bodies are requested to consult relevant national interests in ISO/TC
8/SC 8 before casting their ballot to the e-Balloting application.
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
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BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 20088-2:2019(E)
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. ISO 2019
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oSIST prEN ISO 20088-2:2019
ISO/DIS 20088-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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.
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oSIST prEN ISO 20088-2:2019
ISO/DIS 20088-2:2019(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 Materials and Tolerances . 3
5.3 Release Nozzle . 3
5.3.1 Nozzle construction . 3
5.3.2 Nozzle position . 4
5.4 Test Assembly supports . 4
5.5 Test Specimen and Recirculation chamber. 4
6 Cryogenic spill protection materials . 5
6.1 General . 5
6.2 Wet Applied Coating Systems . 6
6.3 Preformed System Testing . 6
7 Instrumentation for test specimens . 6
7.1 General . 6
7.2 Thermocouple location . 6
8 Test Environment . 7
9 Test Procedure . 7
10 Repeatability and reproducibility . 8
11 Uncertainty of measurement . 8
12 Test report . 8
13 Practical applications of test results . 9
13.1 General . 9
13.2 Performance criteria .10
13.2.1 General.10
13.2.2 Coatings and spray-applied materials .10
13.2.3 Systems and assemblies .10
13.3 Factors affecting the validity of the test .11
13.3.1 General.11
13.3.2 Failure at nozzle .11
13.3.3 Failure of thermocouples . .11
Annex A (normative) Methods of fixing thermocouples .12
Annex B (informative) Classification .13
Bibliography .15
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Foreword
ISO (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. 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. 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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO's adherence to the WTO (World Trade Organisation)
principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary
information
ISO 20088 Part 2 was prepared by the Sub Committee ISO/TC 67/SC 9, Liquefied Natural Gas (LNG)
installations and equipment, JWG 3 resistance to cryogenic spill.
Other parts of this standard are:
Part 1- Liquid phase: This is applied where a pool of liquid is expected to result either from jet release
or low pressure release conditions of cryogenic liquid
Part 3 – Jet Release; This is to be applied where a cryogenic liquid jet as a result of a pressurised release
impinges structural steel not resulting in immersion or standing liquid conditions
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Introduction
The test is intended to be, as far as practicable, representative of a potential accidental pressurised
release of cryogenic LNG material manufactured in industrial plants. The test includes:
a. Release from of cryogenic liquid under pressure,
b. Scenarios where the conditions in the jet characterised predominantly by gaseous exposure.
This test is designed to give an indication of how cryogenic spill protection materials will perform in a
sudden exposure to cryogenic jet where it is expected that little or no liquid fraction is present.
The dimensions of the test specimen may 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, individual thermal loads imparted to the cryogenic spill protection materials, from the
cryogenic release defined in the procedure described in this part of ISO 20088, have been shown to
be representative of areas exposed to a cryogenic LNG accidental release where little or no liquid is
present.
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oSIST prEN ISO 20088-2:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 20088-2:2019(E)
Determination of the resistance to cryogenic spill of
insulation materials —
Part 2:
Vapour release
CAUTION — the attention of all persons concerned with managing and carrying out cryogenic
spill testing is drawn to the fact that liquid nitrogen testing can be hazardous and that there is a
danger of oxygen condensation (risk of 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 (PPE) shall be given
to relevant personnel.
The test laboratory is responsible to conduct an appropriate risk assessment according to local
regulations 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 cryogenic spill protection (CSP)
systems to vapour generated from a cryogenic liquid release where the liquid content is practically
zero. It is applicable where CSP systems are installed on carbon steel.
Liquid jet release may be formed upon release of Liquified Natural Gas (LNG) from process equipment
operating at pressure, e.g., some liquefaction processes utilise 40 - 60 bar operating pressure. However
at specific distances from the release point it is expected that the liquid fraction will diminish such that
there is practically no effect from liquid cooling in the stream.
It should be recognised that 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
liquid releases that may be found in refrigeration circuits and in LNG streams immediately post-
liquefaction.
Liquid nitrogen (LN ) is used as the cryogenic medium due to the ability to handle the material at the
2
pressures described in this part of the standard safely.
ISO 20088-1 covers cryogenic liquid releases which may lead to pool formation for steel work protected
by CSP. ISO 20088-3 covers jet exposure conditions where there is predominantly liquid in the stream.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 22899-1, Determination of the resistance to jet fires of passive fire protection materials — Part 1:
General requirements
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Cryogenic jet release
unintended exposure to cryogenic liquid as a result of a pressurised 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 who/which requests a test
3.6
Specimen owner
person or company that holds/produces a material to test
3.7
Cooling power
2
The amount of heat transferred per unit area per unit time from a surface (W/m )
3.8
DBTT
Ductile Brittle Transition Temperature
4 Test configurations
4.1 General
The configuration under which the test is conducted is where the plate specimen is placed vertically.
The material to be tested is exposed to a liquid nitrogen release under pressure where the liquid
fraction is practically zero (i.e. gaseous exposure). 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 LN safety risks.
2
5 Construction of the test apparatus and substrates
5.1 General
The key items required for the test are:
— A nozzle and cryogenic liquid feed assembly where the temperature and pressure of the liquid can
be measured at the point the liquid enters the nozzle;
— An environmental chamber (3-sided plastic tunnel) up to a length of 6m;
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— 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;
— Thermocouples to determine the temperature as a function of time in the steel specimen and the
atmosphere immediately in front of the test specimen.
5.2 Materials and Tolerances
The steel grade used for the test is to be recorded. Where welded , construction is to be representative
or 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 ±0,2 mm;
— angles ± 0’ 30”;
— radius ± 0,4 mm.
Test specimen will be a structural steelwork test specimen as described in ISO 22899-1.
5.3 Release Nozzle
5.3.1 Nozzle construction
Liquid nitrogen is released towards the specimen from a nozzle. An example of a suitable nozzle has
the following characteristics. The nozzle to be of length 150 mm , constructed from 10 mm ±0.5mm
nominal diameter stainless steel pipe with outside diameter of 20-30 mm giving a wall thickness
between 5-10 mm. The nozzle must not be tapered and the end is to be clean cut with no chamfering
of pipe walls. The nozzle is fed with liquid nitrogen from a DN50 diameter schedule 40S stainless steel
pipe, with a machined section reducing in internal diameter to 10mm over a 250mm length as shown in
Figure 1.
Figure 1 — Feed pipe and nozzle construction
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5.3.2 Nozzle position
The nozzle shall be positioned horizontally in front of the test specimen, aligned with the centre point
such that the cryogenic release impacts normal to the plate specimen as shown in Figure 2. The tip of
the nozzle shall be located to give the required cooling power described in section 8 of this document.
One example is 5000 mm ±10 mm from the protected surface of the test specimen when the average
o
outlet pressure is 8 barg (Standard deviation of 0.8 barg) and liquid temperature lower than -170 C
(Figure 2)
5.4 Test Assembly supports
The test assembly shall be supported using material resistant to cryogenic temperatures.
Figure 2 — An example of the specimen support and side view configuration
5.5 Test Specimen and Recirculation chamber
A recirculation chamber as shown in Figure 3 (more details to be found in ISO 22899-1) is to be the
primary test piece to which the CSP is applied to the internal surface of the box. Insulation board (U
2
Value maximum 1.25 W/m .K) is to be affixed to the rear of the recirculation chamber. To provide extra
support and stability, the protective chamber as described in ISO 22899-1 is to be attached to the rear
of the recirculation chamber as shown in Figure 2.
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Figure 3 — Recirculation chamber and test sample
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.
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 shall be measured at the positions specified in Figure 4 for sprayed applied systems. The
measurement positions indicated shall be regarded as approximate. For preformed systems, thickness
shall be measured for the protective layer at locations proximal to those presented 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.
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Figure 4 — Thickness Measurement points for test specimen
6.2 Wet Applied Coating Systems
For CSP systems/materials that are wet applied as coatings, the CSP systems/materials should be
applied in the same manner as will be used in service.
6.3 Preformed System Testing
For preformed systems, the system shall also be installed in the same manner as will be used in service.
The method of installing the system shall include representative joints, fixings and wet applied material
interface details; a minimum of two joints should be included as follows:
1) One horizontal joint located over thermocouples: 3, 14, 4 in Figure 5
2) One vertical joint located over thermocouples 4, 7, 10 as shown in Figure 5.
Joints should be tested, either in a single test or separate tests as determined by the sponsor and/or
specimen owner ensuring the details are representative in accordance with section 10.
7 Instrumentation for test specimens
7.1 General
Thermocouples shall be fastened to all test specimens. The type and fixing shall be in accordance with
one of the methods described in Annex A.
Readings shall be recorded at intervals of not more than 1 s.
7.2 Thermocouple location
Thermocouples are positioned as shown in Figure 5. For thermocouple locations shown in red, these are
to be positioned at a distance of 10mm ±2mm away from the test samples (i.e. in the test atmosphere).
Thermocouples shown in black are to be within the steel substrate as described in Annex A.
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Figure 5 — Thermocouple locations for specimen. Red thermocouples are in front of the box
whereas the black marks are in relation to thermocouples in the steel
8 Test Environment
The test shall be preferably operated outdoors. If curing and conditioning is conducted under different
conditions, it shall be clearly stated in the test report.
The test shall be carried out in an environment in which the effects of the weather do not significantly
affect the test and the following conditions apply:
— The distance of the nozzle from the test specimen and the pressure measured at the exit of the
schedule 40 feed pipe prior to entry to the nozzle should be such that the thermocouples in front of
an unprotected bare steel back face of the sample reads in the range -50 to -70 °C, generating a steel
temperature between -40 to -60 °C after 15 minutes release. The test should only be performed
using a validated test configuration;
— The average steel temperature of the steel to be protected by the CSP material prior to testing shall
be 23 ±3 °C at the beginning of the test;
— An environmental chamber (3-sided plastic tunnel) up to a length of 6m, is to be attached to the
recirculation box , see Annex B;
— No direct sunlight exposure.
9 Test Procedure
It is the responsibility of the test laboratory to ensure test parameters are maintained throughout the
duration of the test.
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The test procedure shall include the following:
a) The test set-up should ensure that the intended vapour from the cryogenic liquid release impinges
the steel specimen, protected with CSP, from the start of the test (e.g. provide a deflector plate or
nozzle until the cryogenic liquid release stabilises with the required test parameters).
b) Pressure and temperature readings at the nozzle are to be taken throughout the test. The
temperature of the protected steel substrate is to be monitored throughout the test taking note
of the locations of any sudden drop in temperature. The measurements are to be taken at every 1
second interval.
c) The specimen owner shall provide the specimen for the test in a condition representative of its
practical application. Specifically the test should feature the proposed joint geometry for preformed
systems as described in 6.3.
d) Photographs shall be taken of the test specimen before the test.
e) The thickness of the CSP as well as the outer dimensions of the CSP system / assembly shall be
verified by the independent testing laboratory prior to commencement of the test.
f) Observations shall be recorded of significant details of the behaviour of the test specimen during
the test and after the cryogenic liquid release impingement ceases. Information on deformation or
partial removal of the surface or cracking shall be noted.
g) Photographs of the test specimen shall be taken as soon as is practicable after the end of the test to
reflect the observations made in point f). These pictures shall be included in the test report.
h) Provision should be made that a sample can be inspected within 5 minutes after termination of the
test. Sample access time should be recorded.
10 Repeatability and reproducibility
The test method described in this standard is expected to be repeatable and reproducible between test
laboratories. It is the responsibility of the specimen owner to demonstrate that the test results of the
sample(s) are representative of their CSP system including any joints and fixing details as well as the
applicability to the specific structures to be protected.
11 Uncertainty of measurement
The o
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