ISO 21013-2:2007

INTERNATIONAL ISO
STANDARD 21013-2
First edition
2007-06-15

Cryogenic vessels — Pressure-relief
accessories for cryogenic service —
Part 2:
Non-reclosable pressure-relief devices
Récipients cryogéniques — Dispositifs de sécurité pour le service
cryogénique —
Partie 2: Dispositifs de sécurité non refermables




Reference number
ISO 21013-2:2007(E)
©
ISO 2007

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ISO 21013-2:2007(E)
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ISO 21013-2:2007(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 21013-2 was prepared by Technical Committee ISO/TC 220, Cryogenic vessels.
ISO 21013 consists of the following parts, under the general title Cryogenic vessels — Pressure-relief
accessories for cryogenic service:
⎯ Part 1: Reclosable pressure-relief valves
⎯ Part 2: Non-reclosable pressure-relief devices
⎯ Part 3: Sizing and capacity determination

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INTERNATIONAL STANDARD ISO 21013-2:2007(E)

Cryogenic vessels — Pressure-relief accessories for cryogenic
service —
Part 2:
Non-reclosable pressure-relief devices
1 Scope
This International Standard specifies the requirements for the design, manufacture and testing of
non-reclosable pressure-relief devices for cryogenic service, i.e. for operation with cryogenic fluids in addition
to operation at temperatures from ambient to cryogenic.
This International Standard is restricted to bursting-disc and buckling-pin devices not exceeding a size of
DN 200 designed to relieve single-phase vapours or gases. A bursting-disc or buckling-pin assembly may be
specified, constructed and tested such that it is suitable for use with more than one gas or with mixtures of
gases.
NOTE This International Standard does not provide methods for determining the capacity of bursting-disc or
buckling-pin devices for a particular cryogenic vessel. Such methods are provided in ISO 21013-3.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 4126-2, Safety devices for protection against excessive pressure — Part 2: Bursting disc safety devices
ISO 20421-1, Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design,
fabrication, inspection and testing
ISO 21009-1, Cryogenic vessels — Static vacuum-insulated vessels — Part 1: Design, fabrication, inspection,
and tests
IS 21010, Cryogenic vessels — Gas/materials compatibility
ISO 21028-1, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature — Part 1:
Temperatures below −80 °C
ISO 21028-2, Cryogenic vessels — Toughness requirements for materials at cryogenic temperature — Part 2:
Temperatures between −80 °C and −20 °C
ISO 21029-1, Cryogenic vessels — Transportable vacuum insulated vessels of not more than 1 000 litres
volume — Part 1: Design, fabrication, inspection and tests
ISO 23208, Cryogenic vessels — Cleanliness for cryogenic service
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ISO 21013-2:2007(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4126-2 and the following apply.
3.1
DN (nominal size)
alphanumeric designation of size for components of a pipework system, which is used for reference purposes
and which comprises the letters DN followed by a dimensionless whole number which is indirectly related to
the physical size, in millimetres, of the bore or outside diameter of the end connections
NOTE Adapted from ISO 6708:1995.
3.2
pressure
gauge pressure
pressure for which the value is equal to the algebraic difference between the absolute pressure and the
atmospheric pressure
3.3
rated minimum temperature
lowest temperature for which the pressure-relief device is rated
3.4
rated maximum temperature
highest temperature for which the pressure-relief device is rated
3.5
coincident temperature
temperature of the bursting disc associated with a burst pressure (see 3.11, 3.12 and 3.13 of
ISO 4126-2:2003) and which is the expected temperature of the bursting disc when it is required to burst
3.6
cryogenic fluid
fluid defined as cryogenic fluid in ISO 21029-1 or ISO 21009-1 or ISO 20421-1
NOTE This includes totally evaporated liquids and supercritical fluids.
4 Requirements
4.1 General
Non-reclosing pressure-relief devices shall satisfy the requirements of ISO 4126-2. In the event of conflicting
requirements, this International Standard takes precedence over ISO 4126-2.
4.2 Design
4.2.1 Design temperature
The rated minimum temperature shall be equal to the equilibrium temperature at atmospheric pressure of the
coldest fluid to be relieved. The rated maximum temperature shall be +65 °C unless a higher temperature is
specified in the purchase order.
4.2.2 Coincident temperature
Unless otherwise specified in the purchase order, the coincident temperatures for normal ambient conditions
and for fire conditions shall be 20 °C and 427 °C, respectively. Coincident temperatures for other conditions
shall be specified in the purchase order.
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ISO 21013-2:2007(E)
4.2.3 Sublimating fluid service
Where the pressure-relief device is specified as suitable for service with products that — when vented to
atmosphere from a pressure anywhere between the device’s specified maximum and minimum operating
pressures and at a temperature anywhere between the device’s specified maximum and minimum
temperatures — condense from gas or vapour directly to
...