EN ISO 10286:2025

SLOVENSKI STANDARD
01-december-2025
Nadomešča:
SIST EN ISO 10286:2022
Plinske jeklenke - Terminologija (ISO 10286:2025)
Gas cylinders - Vocabulary (ISO 10286:2025)
Gasflaschen - Vokabular (ISO 10286:2025)
Bouteilles à gaz - Vocabulaire (ISO 10286:2025)
Ta slovenski standard je istoveten z: EN ISO 10286:2025
ICS:
01.040.23 Tekočinski sistemi in sestavni Fluid systems and
deli za splošno rabo (Slovarji) components for general use
(Vocabularies)
23.020.35 Plinske jeklenke Gas cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10286
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 01.040.23; 23.020.35 Supersedes EN ISO 10286:2021
English Version
Gas cylinders - Vocabulary (ISO 10286:2025)
Bouteilles à gaz - Vocabulaire (ISO 10286:2025) Gasflaschen - Vokabular (ISO 10286:2025)
This European Standard was approved by CEN on 30 June 2025.

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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10286:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10286:2025) has been prepared by Technical Committee ISO/TC 58 "Gas
cylinders" in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the
secretariat of which is held by BSI.
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 February 2026, and conflicting national standards
shall be withdrawn at the latest by February 2026.
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.
This document supersedes EN ISO 10286:2021.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 10286:2025 has been approved by CEN as EN ISO 10286:2025 without any modification.

International
Standard
ISO 10286
Sixth edition
Gas cylinders — Vocabulary
2025-08
Bouteilles à gaz — Vocabulaire
Reference number
ISO 10286:2025(en) © ISO 2025
ISO 10286:2025(en)
© ISO 2025
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10286:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms related to pressure receptacles .1
3.1.1 All pressure receptacles .1
3.1.2 All gas cylinders .5
3.1.3 Composite gas cylinders .6
3.1.4 Acetylene cylinders .7
3.1.5 Bundles of cylinders, battery-vehicles and MEGC .8
3.2 Terms related to accessories .9
3.3 Terms related to manufacture . . 15
3.4 Terms related to testing and inspection .16
3.5 Terms related to characteristics, properties and pressures . 20
3.6 Terms related to material . 25
Annex A (informative) Pressure system for pressure receptacles .27
Annex B (informative) Terms of Clause 3 and additional terminology — Equivalent terms in
French and German . .28
Annex C (informative) Figures related to the additional terminology given in Annex B .47
Bibliography .59
Index .60

iii
ISO 10286:2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 58, Gas cylinders, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 23, Transportable
gas cylinders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This sixth edition cancels and replaces the fifth edition (ISO 10286:2021), which has been technically
revised.
The main changes are as follows:
— introduction of several new terms and definitions throughout Clause 3;
— correction of definitions throughout Clause 3;
— removal of some terms and definitions in Clause 3;
— addition to Annex B of both the terms introduced in Clause 3 and of additional terms where no definition
were given but the correct translation into French and German are given.
In addition to text written in the official ISO languages (English, French), this document gives text in
German. This text is published under the responsibility of the Member Body for Germany (DIN) and is given
for information only. Only the text given in the official languages can be considered as ISO text.
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 10286:2025(en)
Introduction
The terms and definitions in this document are given in the following layout:
preferred term(s) in bold typeface
admitted term(s) or synonyms, in normal typeface
DEPRECATED: deprecated term deprecated term(s), in normal typeface, with the designation
“DEPRECATED”:
definition the definition, where available, in normal typeface
Note 1 to entry: notes to entry, cross-references and examples.
Figures/non-verbal representations
The terms in this document are sorted in systematic order as far as possible. Further guidance on
terminological presentation can be found in ISO 10241-1.
The definitions support the understanding of the terms used in this document. They have been prepared
with due regard to possible uses in different fields related to gas cylinders. However, it is possible that they
will require adaption for particular uses.
Within this document, the term “ADR” is for simplification used as to also include similar regulations such as
RID and ADN, where appropriate.
Table 1 shows a hierarchical overview of pressure receptacles according to the UN Model Regulations.
Annex A shows the different pressures for pressure receptacles in relation to each other.
Annex B shows a table giving both the terms of clause 3 as well as terms for additional terminology including
the translation to the other two languages of this three-language document.
Annex C shows figures related to the additional terminology given in Annex B.
Terms given in square brackets are not within the scope of this document. They are shown for information only.
Unless noted by exception, the use of the word “cylinder” in this document refers to cylinders as well as
tubes and pressure drums.
In International Standards, weight is equivalent to a force, expressed in Newton. However, in common
parlance (as used in terms defined in this document), the word “weight” continues to be used to mean
“mass”, even though this practice is deprecated (ISO 80000-4).

v
ISO 10286:2025(en)
vi
Table 1 — Overview of terms for pressure receptacles and related containers which are not defined as pressure receptacles
Small pressure receptacle
receptacle
containing
MEGC (mul-
gas (gas
Battery-vehi- tiple-element
Salvage pres- [Closed [Metal-hy- a
[Tank ]
Pressure Bundle of
d
cartridge)
cle gas contain-
Cylinder Tube sure recepta- cryogenic dride storage
drum cylinders
b c
and er)
cle receptacle ] system ]
aerosol dis-
penser
a
In scope of CEN/TC 296 and CEN/TC 286.
b
In scope of ISO/TC 220.
c
In scope of ISO/TC 197.
d
This designation is used in the ADR.
NOTE Within this document, for simplification, the use of the term “ADR” also includes similar regulations such as RID and ADN, where appropriate.

International Standard ISO 10286:2025(en)
Gas cylinders — Vocabulary
1 Scope
This document defines terms for the manufacture and use of gas cylinders and other pressure receptacles
and their fittings.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Terms related to pressure receptacles
3.1.1 All pressure receptacles
3.1.1.1
pressure receptacle
DEPRECATED: receptacle
transportable receptacle intended for holding substances under pressure including its closure(s) and other
service equipment
Note 1 to entry: It is a collective term that includes cylinders, tubes, pressure drums, closed cryogenic receptacles,
metal-hydride storage system, bundle of cylinders and salvage pressure receptacles.
EXAMPLE Seamless gas cylinder:

ISO 10286:2025(en)
3.1.1.2
cylinder
gas cylinder
transportable pressure receptacle of a water capacity not exceeding 150 l with a test pressure volume
product not exceeding 1,5 million bar·litres
Note 1 to entry: In ISO/TC 58 standards, the term “gas cylinder” is frequently used for clarification.
5 2
Note 2 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
3.1.1.3
tube
pressure receptacle of seamless or composite construction having a water capacity exceeding 150 l but not
more than 3 000 l with a test pressure volume product not exceeding 1,5 million bar·litres
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
3.1.1.4
pressure drum
welded pressure receptacle of a water capacity exceeding 150 l and of not more than 1 000 l
3.1.1.5
bundle of cylinders
DEPRECATED: cylinder bundle, cylinder pack
pressure receptacle comprising an assembly of cylinders or cylinder shells that are fastened together and
which are interconnected by a manifold and transported as a unit, having a product of test pressure and
total water capacity not exceeding 1,5 million bar·litres except that bundles intended for the transport of
toxic gases are limited to 1 000 l total water capacity
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
EXAMPLE
Note 2 to entry: In ISO/TC 58 standards, the term “bundle” is frequently used for simplification.
3.1.1.6
salvage pressure receptacle
pressure receptacle having a total test pressure volume product not exceeding 1,5 million bar·litres into
which are placed damaged, defective, leaking or non-conforming pressure receptacle(s) for the purpose of
transport, e.g. for recovery or disposal
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

ISO 10286:2025(en)
3.1.1.7
pressure receptacle shell
cylinder, tube, pressure drum or salvage pressure receptacle without its closures or other service equipment,
but including any permanently attached device(s) (e.g. neck ring, foot ring etc.)
[SOURCE: UN Model Regulations]
3.1.1.8
small receptacle containing gas
gas cartridge
non-refillable receptacle having a water capacity not exceeding 1 000 ml for receptacles made of metal and
not exceeding 500 ml for receptacles made of synthetic material or glass, containing under pressure a gas or
mixture of gases
3.1.1.9
aerosol
aerosol dispenser
non-refillable receptacle made of metal, glass or plastics and containing a gas, compressed, liquefied or
dissolved under pressure, with or without a liquid, paste or powder and fitted with a release device allowing
the contents to be ejected
EXAMPLE
Note 1 to entry: This note applies to the German language only.
3.1.1.10
metal hydride storage system
single complete hydrogen storage system, including a pressure receptacle shell, metal hydride, pressure relief
device, shut-off valve, service equipment and internal components used for the transport of hydrogen only
Note 1 to entry: Metal hydride storage systems are covered by ISO/TC 197.
Note 2 to entry: See also Table 1.
[SOURCE: UN Model Regulations.]
3.1.1.11
closed cryogenic receptacle
transportable thermally insulated receptacle for refrigerated liquefied gases, of a water capacity of not more
than 1 000 l
Note 1 to entry: Closed cryogenic receptacles are covered by ISO/TC 220.
Note 2 to entry: See also Table 1.
[SOURCE: UN Model Regulations]

ISO 10286:2025(en)
3.1.1.12
MEGC
multiple-element gas container
multimodal assembly of cylinders, tubes or bundles of cylinders which are interconnected by a manifold and
assembled within a framework, including service equipment and structural equipment necessary for the
transport of gases
Note 1 to entry: ADR uses a different definition.
[SOURCE: UN Model Regulations]
3.1.1.13
battery-vehicle
vehicle containing elements which are linked to each other by a manifold and permanently fixed to a
transport unit
Note 1 to entry: The following elements are considered to be elements of a battery-vehicle: cylinders, tubes, bundles of
cylinders and pressure drums, as well as certain tanks destined for the carriage of gases with a capacity of more than 450 l.
Note 2 to entry: This term is used in the ADR only.
3.1.1.14
tank
portable tank, including a tank container, a road tank-vehicle, a rail tank-wagon or a receptacle to contain
solids, liquids or gases, having a capacity of not less than 450 l when used for the transport of gases
Note 1 to entry: ADR uses a different definition.
[SOURCE: UN Model Regulations]
3.1.1.15
portable
capable of being carried by hand
Note 1 to entry: When used in connection with tanks, this means “transportable”.
3.1.1.16
user
entity (or individual) that operates and/or uses equipment
3.1.1.17
minimum design wall thickness
thickness of the metallic cylinder wall calculated from the design standard, taking into account the material
properties and dimensions at time of manufacture
3.1.1.18
external coating
layer of material applied to the cylinder as a protective coating not intended to be removed or for cosmetic
purposes
EXAMPLE Gel coat and paint.
Note 1 to entry: Not all composite cylinders will have an external coating.
3.1.1.19
precautionary label
label giving information on the recommended measures to minimize or prevent adverse effects resulting
from exposure to content, which includes identification of content (UN Number, Proper Shipping Name),
hazards of the content and precautions to be observed in the storage and use of the pressure receptacle and
its contents
EXAMPLE
ISO 10286:2025(en)
Note 1 to entry: See ISO 7225 for additional examples.
3.1.2 All gas cylinders
3.1.2.1
type 1
category of pressure receptacles that includes all metal pressure receptacles
3.1.2.2
composite cylinder
cylinder reinforced by continuous filaments held in a matrix
Note 1 to entry: Cylinders of type 2, type 3, type 4 and type 5 are composite cylinders.
3.1.2.3
type 2
category of pressure receptacles that refers to hoop wrapped pressure receptacle with a load-sharing metal
liner and composite reinforcement on the cylindrical portion only
3.1.2.4
type 3
category of pressure receptacles that refers to fully wrapped pressure receptacle with a load sharing metal
liner and composite reinforcement on both the cylindrical portion and the dome ends
3.1.2.5
type 4
category of pressure receptacles that refers to fully wrapped pressure receptacle with a non-load sharing
liner and composite reinforcement on both the cylindrical portion and the dome ends
3.1.2.6
type 5
category of pressure receptacles that refers to composite pressure receptacle without a liner
3.1.2.7
acetylene cylinder
cylinder manufactured and suitable for the transport of acetylene, containing a porous material and solvent
(where applicable) for acetylene with a valve and other accessories affixed to the cylinder
3.1.2.8
cylinder end
part of the cylinder either closing the cylindrical section or enabling the installation of a closure, e.g. valve
EXAMPLE Cylinder base, cylinder shoulder.
3.1.2.9
cylinder neck thread
axial hole with a tapered or parallel thread formed on the internal surface of a cylinder neck
Note 1 to entry: For parallel threads, this includes a thread formed on the internal surface including a sealing recess
for the “O” ring and thread relief.

ISO 10286:2025(en)
3.1.2.10
non-refillable cylinder
cylinder including a non-refillable sealing device that permits the cylinder to be filled only once
3.1.2.11
sleeve
transparent or non-transparent cover fitted to the outside surface of the cylinder
3.1.2.12
non-refillable sealing device
device permanently attached to the cylinder which, once activated, prevents the cylinder from being refilled
3.1.3 Composite gas cylinders
3.1.3.1
overwrap
reinforcement system of filament and matrix applied over the liner
3.1.3.2
matrix
material used to bind and hold the fibres in place
3.1.3.3
resin
polymer used for composite cylinders as a matrix or coating
3.1.3.4
liner
inner portion of a composite cylinder, comprising a metallic or non-metallic vessel, whose purpose is both to
contain the gas and transmit the gas pressure to the overwrap
3.1.3.5
load-sharing liner
load-bearing liner
liner which has a burst pressure greater than or equal to 5 % of the nominal burst pressure of the finished
composite cylinder
3.1.3.6
non load-sharing liner
non load-bearing liner
liner having a burst pressure less than 5 % of the nominal burst pressure of the finished composite cylinder
3.1.3.7
fibre
strand
roving
material provided as a filament or a bundle of filaments
3.1.3.8
translucent cylinder
cylinder that permits the passage of light
3.1.3.9
permanent protective attachment
integral part of the cylinder design permanently affixed to composite cylinders (type 2 to 5) covering part of
or the entire surface of the cylinder, providing additional functions during handling, transport and use

ISO 10286:2025(en)
3.1.4 Acetylene cylinders
3.1.4.1
porous material
single- or multiple-component material introduced to, or formed in, the cylinder shell, that, due to its
porosity, allows the absorption of a solvent/acetylene solution
Note 1 to entry: The porous material can be either:
— monolithic, consisting of a solid product obtained by reacting materials or by materials connected together with a
binder; or
— non-monolithic, consisting of granular, fibrous or similar materials without the addition of a binder.
3.1.4.2
top clearance
gap between the inside of the cylinder shoulder and the monolithic porous material
3.1.4.3
solvent
liquid absorbed by the porous material and is capable of dissolving and releasing acetylene
3.1.4.4
specified solvent content
weight of solvent that the acetylene cylinder nominally contains and that is established during prototype testing
3.1.4.5
maximum acetylene content
specified maximum weight of acetylene including saturation acetylene in an
acetylene cylinder
Note 1 to entry: Acetylene content can be calculated by subtracting tare A from the weight after filling.
3.1.4.6
maximum acetylene content
specified maximum weight of acetylene including saturation acetylene in the
bundle of cylinders
Note 1 to entry: Acetylene content can be calculated by subtracting tare A from the weight after filling.
3.1.4.7
maximum acetylene charge
maximum acetylene load
specified maximum quantity of acetylene minus the saturation acetylene
Note 1 to entry: The maximum acetylene charge is considered to be the maximum quantity of acetylene available for
the end user.
Note 2 to entry: Acetylene charge can be calculated by subtracting tare S from the weight after filling.
3.1.4.8
residual gas
residual acetylene
weight of acetylene including the saturation acetylene contained in an acetylene cylinder
returned for filling
3.1.4.9
saturation acetylene
saturation gas
acetylene that remains dissolved in the solvent in the acetylene cylinder at atmospheric pressure (1,013 bar)
and at a temperature of 15 °C
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

ISO 10286:2025(en)
3.1.4.10
tare A
sum of weights of the empty cylinder shell, the porous material, the specified solvent content, the valve,
the coating and the valve guard, where applicable, and all other parts that are permanently attached to the
acetylene cylinder when it is presented to be filled
3.1.4.11
tare S
tare A plus the weight of the saturation acetylene
3.1.4.12
tare F
tare A minus the specified solvent content
3.1.4.13
acetylene decomposition blocker
safety device that stops acetylene decomposition at a pressure of ≤25 bar
Note 1 to entry: The decomposition blocker for high-pressure acetylene can optionally comprise other safety elements
such as non-return valves or automatic quick-acting shut-off devices (see ISO 15615).
Note 2 to entry: 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
3.1.5 Bundles of cylinders, battery-vehicles and MEGC
3.1.5.1
frame
structural and non-structural members of either a bundle, a MEGC or equivalent assembly which combine
all other components together, while providing protection for the assembly’s cylinders, valves and manifold,
and which enable the assembly to be transported
EXAMPLE
3.1.5.2
manifold
piping system for connecting pressure receptacle(s) valves or cylinder fittings to the main valve(s) or the
main connection(s)
EXAMPLE
ISO 10286:2025(en)
3.1.5.3
main connection
means of making a gas connection to a bundle/battery-vehicle/MEGC
3.1.5.4
main valve
main shut-off valve
DEPRECATED: bundle valve
valve which is fitted to the manifold of a bundle of cylinders, battery-vehicle, battery wagon or MEGC
isolating it from the main connection(s)
3.1.5.5
cylinder fitting
component with no gas shut-off capability that serves as a
method for connecting a manifold to individual cylinders or tubes when valves are not fitted to the cylinders
or tubes
Note 1 to entry: Cylinder fittings are in use both for bundles of cylinders and for assemblies such as MEGCs and
battery-vehicles.
3.2 Terms related to accessories
3.2.1
accessory
device fitted to a pressure receptacle needed for operation and/or transport
EXAMPLE Cylinder valve, valve protection cap/valve guard, fitting, pressure regulator, pressure gauge.
3.2.2
fitting
component with no gas shut-off capability that serves as a connection
3.2.3
closure
device which closes an opening in a receptacle
EXAMPLE Valves, pressure relief devices, plugs, pressure gauges.
3.2.4
cylinder valve
type of closure which is fitted to a cylinder with the purpose of allowing or restricting the flow of gas from
the cylinder
3.2.5
valve operating mechanism
mechanism which closes and opens the valve orifice and which includes the internal and external sealing systems
Note 1 to entry: For a VIPR, the valve operating mechanism is called the primary valve operating mechanism.

ISO 10286:2025(en)
EXAMPLE A threaded valve spindle which, when rotated, raises and lowers a seal/seat.
3.2.6
valve operating device
component which actuates the valve operating mechanism
EXAMPLE Handwheel (including knob), key, toggle, lever or actuator.
3.2.7
activation device
means for initiating the activation of the valve operating device
EXAMPLE Manually, mechanically, electrically, magnetically, thermally, hydraulically, pneumatically,
pyrotechnically or a combination thereof.
3.2.8
valve inlet connection
DEPRECATED: valve stem
connection on the valve which connects the valve to the pressure receptacle
3.2.9
valve outlet connection
connection on the valve used to discharge the contents of the pressure receptacle
Note 1 to entry: For most valves this connection is also used for filling the pressure receptacle.
3.2.10
valve filling connection
connection on the valve used to fill the pressure receptacle
Note 1 to entry: For some valves (e.g. VIPRs) the valve filling connection is different from the valve outlet connection.
3.2.11
filling connection closing device
closing device located in the filling connection
EXAMPLE Non-return valve, isolating valve.
3.2.12
pressure outlet
outlet intended to deliver gas at a controlled pressure
3.2.13
pressure regulating system
device(s) that reduce(s) the inlet pressure to a controlled outlet pressure
Note 1 to entry: A pressure regulating system can comprise of one or more stages of pressure regulation.
3.2.14
non-return valve
automatic valve which allows gas/liquid to flow only in one direction
EXAMPLE
ISO 10286:2025(en)
3.2.15
residual pressure valve
RPV
valve which incorporates a residual pressure device
3.2.16
residual pressure device
RPD
device that is designed to prevent ingress of contaminants by maintaining a positive pressure within
the pressure receptacle relative to atmosphere by closing off its internal gas passages in the discharging
direction
3.2.17
excess flow device
device designed to close or partially close when the flow of liquid, gas or vapour passing through it exceeds
a predetermined value and to re-open when the pressure differential across the device has been restored
below a certain value
Note 1 to entry: Some excess flow valves are designed to stay shut-off until reset.
3.2.18
pressure relief device
PRD
pressure- and/or temperature-activated device used to prevent the pressure in a pressure receptacle from
rising above a predetermined maximum, thereby preventing rupture of the pressure receptacle
Note 1 to entry: In some regions like North America, the term “pressure relief device” implies non-reclosing function.
EXAMPLE Pressure relief valves, bursting discs, fusible plugs and combinations of these devices.
3.2.19
pressure relief valve
PRV
DEPRECATED: safety valve
type of pressure relief device designed to relieve excessive pressure and to reclose and reseal to prevent
further flow of gas or fluid from the pressure receptacle after resealing pressure is achieved
EXAMPLE
ISO 10286:2025(en)
3.2.20
ball valve
valve which uses the rotation of a ball with a through-passage to allow or shut-off flow through it
Note 1 to entry: Ball valves can have multiple ports.
3.2.21
self-closing cylinder valve
cylinder valve with a normally closed valve operating mechanism that is actuated by a separate operating
device which is not an integral part of the cylinder valve
3.2.22
quick-release cylinder valve
cylinder valve with a valve operating mechanism designed for quick release of gas cylinder contents that is
actuated by a valve operating device which can be activated by an activation device
Note 1 to entry: Commonly used valve operating mechanisms are pistons, flaps, bursting discs, piercing discs or
differential pressure devices.
Note 2 to entry: The activation device is not necessarily part of the quick-release cylinder valve.
3.2.23
valve with integrated pressure regulator
VIPR
device intended to be permanently fitted to a pressure receptacle which comprises of at least a shut-off
function and pressure regulating system
3.2.24
dual valve
dual port valve
valve designed to allow separate vapour and liquid withdrawal from a cylinder in its normal operating
position each port having its own valve operating mechanism
3.2.25
thermally activated pressure relief device
TPRD
pressure relief device which is activated by temperature rather than by pressure
EXAMPLE Fusible plug, fusible trigger, shape memory metal, electrical trigger, glas bulb, chemical trigger.
3.2.26
bursting disc
rupture disc
operating part of a pressure relief device that when installed in the device is designed to burst at a
predetermined pressure to permit the discharge of fluid
3.2.27
fusible plug
non-reclosing pressure relief device designed to function by yielding or melting of a plug of fusible material
within the specified temperature range
3.2.28
valve protection cap
device protecting the valve during handling, transport and storage and which needs to be removed for
access to the valve to allow for connection, disconnection, opening and closing
EXAMPLE
ISO 10286:2025(en)
3.2.29
valve guard
device protecting the valve during handling, transport and storage, which allows access to the valve
without removal
Note 1 to entry: There are two types of valve guards: rotational and non-rotational valve guards.
EXAMPLE
3.2.30
valve shroud
integral part of a welded cylinder design or pressure drum design for valve protection during transport,
handling and storage
EXAMPLE
3.2.31
dust cap
device which is intended to protect the external inlet or outlet connection of a pressure receptacle valve
against the ingress of dust, dirt or other contaminants
EXAMPLE
3.2.32
dust plug
device which is intended to prevent the ingress of dust, dirt or other contaminants by protecting the internal
inlet or outlet connection of a valve, cylinder, tube or pressure drum

ISO 10286:2025(en)
3.2.33
sealing cap
device which is intended to seal the external outlet connection of a pressure receptacle valve
EXAMPLE
3.2.34
sealing plug
device which is intended to seal the internal outlet connection of a pressure receptacle valve
EXAMPLE
3.2.35
neck ring
ring securely attached externally to the cylinder or neck boss, with external thread or other means for
attaching valve protection cap or valve guard
3.2.36
periodic inspection date ring
DEPRECATED: test date ring
ring indicating the date of the next periodic inspection
Note 1 to entry: Sometimes different forms and colours are used to enable quick identification of oncoming periodic
inspection dates.
3.2.37
eduction tube
eductor tube
dip tube
tube fitted to the valve inlet to allow withdrawal of the liquid phase of a liquified gas with the cylinder in its
normal operating position
Note 1 to entry: When this tube is used to homogenise mixtures, it is often called 'mix tube'.
3.2.38
single-part gauge
gauge of sufficient length to contact the length of full form taper threads
Note 1 to entry: These gauges are either plugs or rings, plain or threaded.

ISO 10286:2025(en)
3.2.39
internal leak tightness
leak tightness across the valve seat (leakage in and/or leakage out) when the valve is closed
3.2.40
external leak tightness
leak tightness to atmosphere (leakage in and/or leakage out) when the valve is open
Note 1 to entry: The total external leakage typically comprises that from the valve external sealing system plus, for
example, pressure relief device, RPD, pressure indicating devices and pressure regulating system.
3.3 Terms related to manufacture
3.3.1
batch
set of homogeneous items or material, where the number of items in a batch can vary according to the
context in which the term is used
Note 1 to entry: For specific applications, the definition can differ, but in this case the applications are identified within
ISO/TC 58 standards by pointed brackets.
3.3.2
finished cylinder
cylinder which is fully assembled and appropriately marked, with or without any external coatings
3.3.3
finished drum
drum which is fully assembled and appropriately marked, with or without any external coatings
3.3.4
finished tube
tube which is fully assembled and appropriately marked, with or without any external coatings
3.3.5
autofrettage
pressure application procedure which strains the metal liner past its yield strength sufficient to cause
permanent plastic deformation, and results in the liner having compressive stresses and the fibres having
tensile stresses when at zero internal gauge pressure
3.3.6
stress relieving
heat treatment given to reduce the residual stresses of the metal
3.3.7
solution heat treatment
solution annealing
thermal treatment which consists of heating the products to a suitable temperature, holding at that
temperature long enough to allow constituents to enter into solid solution, and cooling rapidly enough to
hold the constituents in solution
3.3.8
quenching
hardening heat treatment in which a cylinder, which has been heated to a uniform temperature is cooled
rapidly in a suitable medium
3.3.9
tempering
toughening heat treatment which follows quenching, in which the cylinder is heated to a uniform temperature
below the lower critical point (AC1) of the steel

ISO 10286:2025(en)
3.3.10
normalizing
heat treatment in which the steel cylinder is heated to a uniform temperature above the upper critical point
(AC3) of the steel and then cooled in a controlled atmosphere
3.4 Terms related to testing and inspection
3.4.1
testing
carrying out one or more test(s)
3.4.2
test
technical operation(s) for determining one or more characteristics according to a specified procedure to
identify differences between specified, expected and actual results
Note 1 to entry: The term "testing" describes the activity of performing (a) test(s). It is not a synonym for the term "test".
3.4.3
type test
prototype test
test or series of tests conducted to prove that the design meets the requirements
3.4.4
inspection
evaluation of conformity by observation and judgement accompanied as appropriate by measurement,
examination, testing or gauging
3.4.5
interval
length of time between two specified inspections and/or tests
3.4.6
design life
maximum number of years for which a pressure receptacle is designed and approved in accordance with the
applicable standard
3.4.7
service life
number of years a piece of equipment is permitted to be in service
3.4.8
verification
DEPRECATED: check
confirmation, by examination of objective evidence, that specified requirements have been fulfilled
3.4.9
validation
confirmation of performance, through the provision of objective evidence, that the requirements for a
specific use or application have been fulfilled
3.4.10
examination
process of determining a condition by judgement
Note 1 to entry: The examination results in a pass or fail or further measurement, testing or gauging.

ISO 10286:2025(en)
3.4.11
maintenance
DEPRECATED: reconditioning
set of activities performed during the operating life of pressure equipment to ensure it complies with the
relevant specification
Note 1 to entry: Maintenance can include cleaning and replacing worn or damaged parts meeting the original
specification.
3.4.12
repair
set of activities performed on defective pressure equipment to restore its compliance with the relevant
specification
Note 1 to entry: Repair can include replacing
...