FprEN ISO 21011
(Main)Cryogenic vessels - Valves for cryogenic service (ISO/FDIS 21011:2023)
Cryogenic vessels - Valves for cryogenic service (ISO/FDIS 21011:2023)
This document specifies the requirements for the design, manufacture and testing of valves for a rated
temperature of -40 °C and below (cryogenic service), i.e. for operation with cryogenic fluids in addition
to operation at temperatures from ambient to cryogenic.
It applies to all types of cryogenic valves, including vacuum jacketed cryogenic valves up to size DN
200. This document can be used as guidance for larger size valves. This document is not applicable to
pressure relief valves covered by ISO 21013-1.
Kryo-Behälter - Ventile für den Kryo-Betrieb (ISO/FDIS 21011:2023)
Dieses Dokument legt die Anforderungen an die Konstruktion, Herstellung und Prüfung von Absperr-armaturen bei einer Bemessungstemperatur von −40 °C und darunter (Kryo-Betrieb) fest, d. h. für den Betrieb mit tiefkalten Fluiden zusätzlich zum Betrieb bei Umgebungstemperaturen bis zu tiefkühlen Temperaturen.
Dieses Dokument gilt für alle Arten von tiefkalten Absperrarmaturen, einschließlich vakuum-isolierten tiefkalten Absperrarmaturen mit Nennweiten bis DN 200.
Dieses Dokument kann als Anleitung für Absperrarmaturen mit größeren Nennweiten angewendet werden.
Dieses Dokument gilt nicht für in ISO 21013 1 enthaltene Druck-Ablass-Einrichtungen.
Récipients cryogéniques - Robinets pour usage cryogénique (ISO/FDIS 21011:2023)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 21011:2021
01-maj-2021
Kriogene posode - Ventili za kriogeno območje (ISO/DIS 21011:2021)
Cryogenic vessels - Valves for cryogenic service (ISO/DIS 21011:2021)
Kryo-Behälter - Ventile für den Kryo-Betrieb (ISO/DIS 21011:2021)
Récipients cryogéniques - Robinets pour usage cryogénique (ISO/DIS 21011:2021)
Ta slovenski standard je istoveten z: prEN ISO 21011
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
23.060.01 Ventili na splošno Valves in general
oSIST prEN ISO 21011:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN ISO 21011:2021
oSIST prEN ISO 21011:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 21011
ISO/TC 220 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2021-03-22 2021-06-14
Cryogenic vessels — Valves for cryogenic service
ICS: 23.020.40
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
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
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 21011:2021(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 2021
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2021 – All rights reserved
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 4
4.1 Materials . 4
4.1.1 General. 4
4.1.2 Metallic materials . 4
4.1.3 Non-metallic materials . 4
4.1.4 Corrosion resistance . 4
4.1.5 Gas material compatibility . 5
4.2 Design . 5
4.2.1 General. 5
4.2.2 Packing gland . 6
4.2.3 Operating positions . 6
4.2.4 Cavities . 6
4.2.5 Valve bonnet . 6
4.2.6 Securing of gland extension . 6
4.2.7 Seat . 6
4.2.8 Stem securement . 6
4.2.9 Torque . 7
4.2.10 Electric continuity and explosion proofness . 7
4.2.11 Fire resistance . 7
5 Testing . 7
5.1 Type approval . 7
5.1.1 Verification of the design . 7
5.1.2 Model number . 7
5.1.3 Type approval tests. 7
5.2 Production tests . 9
5.3 Test report . 9
6 Cleanliness . 9
7 Marking . 9
7.1 Marking on the body of the valve . 9
7.2 Marking on an identification plate .10
Annex A (informative) Recommended methods for leak tightness testing of cryogenic valves .11
Annex B (informative) Thermal shock test for valves used in LNG service .13
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure Equipment Directive) aimed to
be covered . .14
Bibliography .15
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(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 220, Cryogenic vessels,
This second edition cancels and replaces the first edition (ISO 21011:2008), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Update of the scope;
— Clarification of the use of pressure units;
— Revision of the type approval tests;
— Revision of Clause 7 Marking.
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 2021 – All rights reserved
oSIST prEN ISO 21011:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 21011:2021(E)
Cryogenic vessels — Valves for cryogenic service
1 Scope
This document specifies the requirements for the design, manufacture and testing of valves for a rated
temperature of −40 °C and below (cryogenic service), i.e. for operation with cryogenic fluids in addition
to operation at temperatures from ambient to cryogenic.
It applies to all types of cryogenic valves, including vacuum jacketed cryogenic valves up to size DN
200. This document can be used as guidance for larger size valves. This document is not applicable to
pressure relief valves covered by ISO 21013-1.
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 5208:2015, Industrial valves — Pressure testing of metallic valves
ISO 10434:2020, Bolted bonnet steel gate valves for the petroleum, petrochemical and allied industries
ISO 10497:2010, Testing of valves — Fire type-testing requirements
ISO 15761:2020, Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and
natural gas industries
ISO 17292:2015, Metal ball valves for petroleum, petrochemical and allied industries
ISO 21010:2017, Cryogenic vessels — Gas/material compatibility
ISO 21028-1:2016, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature —
Part 1: Temperatures below -80 degrees C
ISO 21028-2:2018, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature —
Part 2: Temperatures between -80 degrees C and -20 degrees C
ISO 23208:2017, Cryogenic vessels — Cleanliness for cryogenic service
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/
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
3.1
nominal size
DN or NPS
alphanumeric designation of size for components of a pipe work system, which is used for reference
purposes.
Note 1 to entry: It comprises the letters “DN” or “NPS” followed by a dimensionless whole number or fractional
number which is indirectly related to the physical size of the bore or outside diameter of the end connections.
3.2
rated pressure PR
maximum pressure difference between the inside and outside of any pressure retaining boundary for
which the boundary is designed to be operated at 20 °C
Note 1 to entry: The PR of the valve is the lowest PR of any component of the valve.
3.3
PN or Class
numerical designation relating to pressure that is a convenient rounded number for reference purposes,
and which comprises the letters PN or Class followed by the appropriate reference number
Note 1 to entry: It is desirable that all equipment of the same nominal size (DN or NPS) designated by the same
PN or Class number has compatible mating dimensions.
Note 2 to entry: Tables of pressure/temperature ratings in the appropriate standards provide guidance on the
maximum allowable pressure subject to materials, design and working temperature;
3.4
rated minimum temperature
lowest temperature for which the valve is rated by the manufacturer
3.5
valve category A
valves intended to be operated with normal frequency (above 20 cycles a year)
Note 1 to entry: See 5.1.3.3.
3.6
valve category B
valves intended to be operated only occasionally i.e. with a frequency below 20 cycles a year
Note 1 to entry: See 5.1.3.3.
3.7
flow coefficient
basic coefficient used to state the flow capacity of a valve under specified conditions
Note 1 to entry: Flow coefficients in current use are Kv and Cv depending upon the system of units.
Note 2 to entry: Even though the dimensions and units used with flow coefficient Kv differ from those used with
flow coefficient Cv, it is possible to relate the two flow coefficients numerically by means of the relationship.
KC=0,865
vv
Note 3 to entry: The flow coefficient definitions given in 3.7.1 (for Kv) and in 3.7.2 (for Cv) include certain
units, nomenclature and temperature values which are not consistent with the parts of IEC 60534 other than
IEC 60534-1. These inconsistencies are limited to 3.7.1 and 3.7.2 of this document, and their sole purpose is to
illustrate the unique relationships traditionally used in the valve industry. These inconsistencies do not concern
any parts of IEC 60534 other than IEC 60534-1.
2 © ISO 2021 – All rights reserved
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
3.7.1
flow coefficient
K
v
special volumetric flow rate calculated in cubic metres per hour (capacity) through a valve, with the
1)
valve 100% fully open, where the static pressure loss across the valve is 1 bar (0.1 MPa) , and the fluid
is water within a temperature range 5 °C to 40 °C (278 K to 313 K)
Note 1 to entry: The value of Kv can be obtained from test results by means of the following formula:
Δp
ρ
K
v
KQ=
v
Δp ρ
w
where
Q is the measured volumetric flow rate, in m /h;
Δp
is the static pressure loss of 1 bar (0,1 MPa);
K
v
Δp is the measured static pressure loss across the valve, in bar (MPa);
ρ is the density of the fluid, in kg/m3;
ρ is the density of water, in kg/m3 (1 000 kg/m3).
w
This formula is valid when the flow is turbulent and no cavitation or flashing occurs.
3.7.2
flow coefficient C
v
Cv
non-SI valve coefficient which is in widespread use worldwide
Note 1 to entry: Numerically, Cv is represented as the number of US gallons of water, within a temperature range
of 40 °F to 100 °F, that will flow through a valve in 1 min, with the valve 100% fully open, when a pressure
1)
drop of 0,068 948 bar (0,006 894 8 MPa) occurs. For conditions other than these, Cv can be obtained using the
following formula:
Δp
C ρ
v
CQ=
v
Δp ρ
w
where
Q
is the measured volumetric flow rate, in US gallons per minute
1 gal (US)/min = 309 x 10-5 m3/s.
ρ
is the density of the fluid, in pounds per cubic foot
1 lb/ft3 = 16,018 kg/m3.
ρ
is the density of water within a temperature range of 4 °C to 38 °C (40 °F to 100 °F), in pounds
w
per cubic foot;
Δp
is the measurement state pressure loss across the valve, in psi;
Δ p = 1psi .
C
v
This formula is valid when the flow is turbulent and no cavitation or flashing occurs.
1) 1 psi = 0,068 948 bar = 0,006 894 8 MPa.
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
3.8
bonnet
part connecting the valve body to the seal packing chamber
4 Requirements
4.1 Materials
4.1.1 General
Materials shall be in conformance with an internationally recognized standard and compatible with the
fluid. Galling, frictional heating and galvanic corrosion shall be considered in the selection of materials.
Materials shall also be oxygen compatible, if relevant (see 4.1.5.1).
Materials not listed in an internationally recognized standard shall be controlled by the manufacturer
of the valve by a specification ensuring control of chemical content and physical properties, and
ensuring quality at least equivalent to an internally recognized standard. A test certificate providing
the chemical content and physical property test results shall be provided with the valve.
4.1.2 Metallic materials
Metallic materials to be used in the construction of cryogenic valves shall meet the toughness
requirements of ISO 21028-1 or ISO 21028-2 as appropriate for the rated minimum temperature.
These requirements apply only to the valve parts exposed to low temperatures in normal service.
Metallic materials which do not exhibit ductile/brittle transition and non-ferrous materials which can
be shown to have no ductile/brittle transition do not require additional impact tests.
Forged, rolled, wrought and fabricated valve components from raw materials from these processes need
not be impact tested if the rated minimum temperature is higher than the ductile/brittle transition
range temperatures of the material. Castings meeting the requirements of one of the applicable
mandatory Appendices I and IV or II and III of ASME B16.34 for forgings and rolled or wrought material,
or conforming to equivalent standards, need not be impact tested if the rated minimum temperature is
higher than the ductile/brittle transition range temperatures of the material. When impact testing is
required, at least one randomly selected valve body (including bonnet, if applicable) material from each
production lot castings shall be impact tested at the rated minimum temperature.
4.1.3 Non-metallic materials
Non-metallic materials are well established only for use in packing and glands and for use for inserts
within the plug/stem assembly to provide leak tightness across the seat when the valve is closed. If
such materials are to be used for structural parts, they shall have the properties appropriate to
the application and conform to ISO 21028-1 or ISO 21028-2, as appropriate to the rated minimum
temperature.
Non-metallic materials shall also:
— have mechanical properties that will allow the valve to pass the type approval test for category A
valves defined in 5.1.3.3;
— be resistant to sunlight, weather and ageing.
— be oxygen compatible, if applicable, see 4.1.5.1.
4.1.4 Corrosion resistance
In addition to resistance to normal atmospheric corrosion, particular care shall be taken to ensure that
the valve cannot be rendered inoperative by accumulation of corrosion products. Some copper alloys
4 © ISO 2021 – All rights reserved
oSIST prEN ISO 21011:2021
ISO/DIS 21011:2021(E)
are susceptible to stress corrosion cracking; consequently, careful consideration shall be given before
selection of these materials for components under stress. Careful consideration shall be given to the
leak detection fluid that is used for leak checking copper alloys to ensure that the fluid does not cause
stress corrosion cracking in copper alloys (e.g. ASTM G186).
4.1.5 Gas material compatibility
4.1.5.1 Oxygen
...
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