ISO 10464:2004
(Main)Gas cylinders — Refillable welded steel cylinders for liquefied petroleum gas (LPG) — Periodic inspection and testing
Gas cylinders — Refillable welded steel cylinders for liquefied petroleum gas (LPG) — Periodic inspection and testing
ISO 10464:2004 specifies the intervals and inspection and testing procedures for the periodic inspection of refillable welded steel dedicated LPG cylinders of water capacity from 0,5 l up to and including 150 l. It applies to cylinders protected by a system to prevent external corrosion and designed and manufactured in accordance with ISO 4706, ISO 22991 or an equivalent design and construction standard. ISO 10464 may also apply to other refillable welded steel cylinder designs for LPG with the approval of the national authority. Cylinders for the on-board storage of LPG as a fuel for vehicles are excluded from the standard, except cylinders used for fork-lift truck applications.
Bouteilles à gaz — Bouteilles rechargeables soudées en acier pour gaz de pétrole liquéfié (GPL) — Contrôles et essais périodiques
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 10464
First edition
2004-08-15
Gas cylinders — Refillable welded steel
cylinders for liquefied petroleum gas
(LPG) — Periodic inspection and testing
Bouteilles à gaz — Bouteilles rechargeables soudées en acier pour gaz
de pétrole liquéfié (GPL) — Contrôles et essais périodiques
Reference number
©
ISO 2004
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Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Intervals between periodic inspections . 2
5 Procedures for periodic inspection . 2
5.1 General . 2
5.2 Test procedures . 3
5.3 External visual inspection . 3
5.4 Additional test procedures . 6
6 Inspection of cylinder threads . 9
6.1 General . 9
6.2 Internal threads . 9
6.3 External threads . 9
6.4 Damaged threads . 9
7 Final operations . 9
7.1 Drying . 9
7.2 Purging . 10
7.3 Tare mass . 10
7.4 Valving . 10
7.5 Marking . 10
7.6 Reference to next periodic inspection date . 10
7.7 Identification of contents . 10
8 Rendering cylinders unserviceable . 10
9 Records . 11
Annex A (normative) Requirements for 15-year periodic inspection interval . 12
Annex B (informative) System of protection against external corrosion . 13
Annex C (informative) Procedure that may be adopted when it is suspected that a cylinder valve is
obstructed/blocked . 14
Bibliography . 15
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ISO 2004 – All rights reserved iii
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 10464 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational
requirements for gas cylinders.
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iv ISO 2004 – All rights reserved
Introduction
The primary objective of the periodic inspection of transportable refillable welded steel liquefied petroleum gas
(LPG) cylinders is that, at the completion of the test, the cylinders can be reintroduced into service for a further
period of time.
The original periodic inspection and test procedures for transportable refillable welded steel LPG cylinders were
based on those for gas cylinders or other pressure vessels, including those used for high-pressure industrial
gases. These early methods relied on a periodic hydraulic proof pressure test being carried out at intervals as
frequently as two years (pre-1940). With increasing experience and confidence so gained, together with
improved cylinder manufacturing quality, it has been possible to allow the extension of the intervals between
periodic tests to 15 years.
Periodic inspection is normally carried out at a test station operating under the supervision of a competent body.
This International Standard has been prepared to reflect the current state of the art for the periodic inspection
of LPG cylinders and is based on the operating experience of millions of cylinders in service over many years.
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ISO 2004 – All rights reserved v
.
vi
INTERNATIONAL STANDARD ISO 10464:2004(E)
Gas cylinders — Refillable welded steel cylinders for liquefied
petroleum gas (LPG) — Periodic inspection and testing
WARNING — This International Standard calls for the use of substances and procedures that can be
injurious to health if adequate precautions are not taken. It refers only to technical suitability and does
not absolve the user from legal obligations relating to health and safety at any stage. It has been
assumed in the drafting of this International Standard that the execution of its provisions is entrusted to
appropriately qualified and experienced people.
1Scope
This International Standard specifies the intervals and inspection and testing procedures for the periodic
inspection of refillable welded steel dedicated LPG cylinders of water capacity from 0,5 l up to and including
150 l.
It applies to cylinders protected by a system to prevent external corrosion and designed and manufactured in
accordance with ISO 4706, ISO 22991 or an equivalent design and construction standard. This International
Standard may also apply to other refillable welded steel cylinder designs for LPG with the approval of the
national authority. Cylinders for the on-board storage of LPG as a fuel for vehicles are excluded from this
standard, except cylinders used for fork-lift truck applications.
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 4706, Refillable welded steel gas cylinders
ISO 8501-1:1988, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates
and of steel substrates after overall removal of previous coatings
ISO 8504-2, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 2: Abrasive blast-cleaning
ISO 9162, Petroleum products — Fuels (class F) — Liquefied petroleum gases — Specifications
ISO 10691, Gas cylinders — Refillable welded steel cylinders for liquified petroleum gas (LPG) — Procedures
for checking before, during and after filling
ISO 14245, Gas cylinders — Specifications and testing of LPG cylinder valves — Self-closing
ISO 15995, Gas cylinders — Specifications and testing of LPG cylinder valves — Manually operated
ISO 22991, Gas cylinders — Transportable refillable welded steel cylinders for liquefied petroleum gas
(LPG) — Design and construction
EN 837-1, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology, requirements
and testing
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ISO 2004 – All rights reserved 1
EN 837-3, Pressure gauges — Part 3: Diaphragm and capsule pressure gauges — Dimensions, metrology,
requirements and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
competent body
person or corporate body, defined by the national or relevant authority, which by combination of appropriate
qualification, training, experience and resources is able to make objective judgments on a subject
3.2
competent person
person who by a combination of training, experience and supervision is able to make objective judgments on a
subject
3.3
liquefied petroleum gas
LPG
a mixture of predominantly butane or propane with traces of other hydrocarbon gases classified in accordance
with UN number 1965, hydrocarbon gas mixture, liquefied, or NOS or UN number 1075, petroleum gases,
liquefied
NOTE In some countries, UN number 1011 and UN number 1978 may also be used to designate LPG.
3.4
periodic inspection
activities carried out at defined intervals including but not limited to examining, measuring, testing or gauging
the characteristics of a cylinder and comparing these with specified requirements as defined in the cylinder
design standard and marking to attest conformity with the standard
3.5
periodic inspection test station
place where cylinders are tested and periodically inspected
3.6
tare mass
sum of the empty mass, the mass of the valve including a dip tube where fitted, and the mass of all other parts
that are permanently attached to the cylinder when it is being filled, e.g. the fixed valve guard
4 Intervals between periodic inspections
The determination of the interval between periodic inspections shall be dependent on the content of a written
scheme that shall be approved by a competent body as complying with the conditions outlined in Annex A.
The interval between periodic inspections shall be 15 years provided the conditions of Annex A are fully met. A
shorter time interval not exceeding 10 years shall apply if any of the conditions specified in Annex A are not met.
5 Procedures for periodic inspection
5.1 General
The determination of the periodic inspection procedures shall be dependent on the content of a written scheme
approved by a competent body.
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5.2 Test procedures
In all cases, periodic inspection procedures shall consist of an external visual inspection as given in 5.3.
Additionally, where required by national regulations, one of the following test procedures shall be performed:
a) hydraulic proof pressure test (see 5.4.2);
b) internal visual inspection (see 5.4.3) provided that cylinders have an adequate wall thickness and the
design burst pressure is known or the actual burst pressure is proven equal to or exceeding:
1) 35 bar for cylinders designed for dedicated butane service,
2) 70 bar for cylinders designed for propane service;
c) pneumatic proof test and leak test (see 5.4.4);
d) pneumatic leak test for LPG cylinders of water capacity 6,5 l or less (see 5.4.5) where the actual burst
pressure is equal to or exceeds:
1) 35 bar for cylinders designed for dedicated butane service,
2) 70 bar for cylinders designed for propane service;
e) volumetric expansion test (see 5.4.6) where authorized by the national or other relevant authority.
5.3 External visual inspection
5.3.1 Preparation for external visual inspection (see also Annex B)
Where the cylinder surface has loose coatings, corrosion products, tar, oil or other foreign matter, these shall be
removed by steel wire brushing, shot blasting in accordance with ISO 8504-2, water jet abrasive cleaning,
chemical cleaning or other suitable methods.
Care shall be taken to avoid damaging the cylinder.
Cylinders treated by a process that may remove cylinder material shall be checked by a suitable means, e.g. a
thickness check.
5.3.2 Inspection procedure
The entire surface of the cylinder shall be inspected by a competent person for:
a) dents, cuts, gouges, bulges, cracks, laminations or punctures, applying the guidelines for rejection in
Table 1;
b) corrosion, giving special attention to areas where water can be trapped, at the base of the cylinder, the
junction between the body and the foot ring, the junction between the body and the valve guard or shroud,
and in particular hidden corrosion (e.g. behind the data plate), applying the criteria for rejection given in
Table 2;
c) other defects (e.g. depressed bung or fire damage), applying the criteria for rejection given in Table 3;
d) the integrity of all permanent attachments.
Any cylinder rejected by the competent person shall be segregated for reconditioning, for further testing or to be
rendered unserviceable (see Clause 8).
NOTE In some countries, to render unserviceable means to scrap.
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ISO 2004 – All rights reserved 3
5.3.3 Visible defects
Rejection criteria for physical and material defects on the cylinder shell are contained in Tables 1, 2 and 3.
Under exceptional conditions and with the approval of a competent person, the wall thickness may be less than
the minimum design value, in which case the cylinder shall pass the pressure test specified in 5.4.2.
Table 1 — Physical defects in the cylinder wall
Defect Description Rejection limit
Bulge Visible swelling of the cylinder Rejection in all cases
Dent A depression in the cylinder that has When the depth of the dent exceeds 25 % of its
a
neither penetrated nor removed metal, width at any point
and its width at any point is greater than
2%
of the external cylinder diameter
Cut or gouge A sharp impression where metal has been Where the original calculated wall thickness is
removed or redistributed known: where depth of cut or gouge is such that
the undamaged (remaining) wall is less than the
minimum calculated wall thickness
Where the original calculated wall thickness is
not known: rejection in all cases
Intersecting cut or gouge The point of intersection of two or more Rejection in all cases
cuts or gouges
Dent containing cut or gouge A depression in the cylinder within which When the size of the dent or cut or gouge
there is a cut or gouge exceeds the dimensions for rejection as an
individual defect
Crack A split or rift in the cylinder shell Rejection in all cases
Lamination Layering of the material within the cylinder Rejection in all cases
wall appearing as a discontinuity, crack,
lap or bulge at the surface
a
Consideration of appearance and location also plays a part in the evaluation of dents.
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Table 2 — Corrosion on the cylinder wall
Defect Description Rejection limit
Isolated corrosion pits Pitting of metal occurring in isolated areas When the depth of discrete pits exceeds 0,6 mm
at a concentration not greater than 1 pit (a greater depth can be accepted provided the
per 500 mm of surface area depth of corrosion does not reduce the wall
thickness below the minimum calculated wall
thickness)
Area corrosion Reduction in wall thickness over an area When the depth of penetration of any pit
not exceeding 20 % of the cylinder exceeds 0,4 mm (a greater depth can be
surface, including the ends (top and accepted provided the depth of corrosion does
bottom) not reduce the wall thickness below the
minimum calculated wall thickness)
General corrosion A reduction in wall thickness over an area When the depth of penetration of any pit
exceeding 20 % of the cylinder surface exceeds 0,2 mm (a greater depth can be
accepted provided the depth of corrosion does
not reduce the wall thickness below the
minimum calculated wall thickness)
Chain pitting or line or A series of pits or corroded cavities of 1) When the total length of corrosion in any
channel corrosion limited width along the length or around direction exceeds 50 % of the
the corrosion circumference circumference of the cylinder
2) When the depth of penetration exceeds
0,4 mm (a greater depth can be accepted
provided the depth of corrosion does not
reduce the wall thickness below the
minimum calculated wall thickness)
3) When the depth of corrosion cannot be
measured
Crevice corrosion Crevice corrosion occurs in the area of the When the depth of penetration exceeds 0,4 mm
intersection of the foot ring or shroud with or when the depth of corrosion cannot be
the cylinder measured
Table 3 — Other defects
Defect Description Rejection limit
Depressed bung Damage to the bung which has altered the Rejection in all cases, or a limited level of
profile of the cylinder depression/alignment deviation may be
accepted as agreed with the competent body
Arc or torch burns Burning of the cylinder base metal, a Rejection in all cases
hardened heat-affected zone, the addition
of extraneous weld metal, or the removal
of metal by scarfing or cratering
a
Fire damage Excessive general or localized heating of Rejection in all cases
a cylinder, usually indicated by:
— charring or burning of paint
— fire damage of the metal
— distortion of the cylinder
— melting of metallic valve parts
— melting of any plastic components,
e.g. date ring, plug or cap
a
If paint is only superficially charred, a cylinder may be accepted by a competent person.
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ISO 2004 – All rights reserved 5
5.4 Additional test procedures
5.4.1 Preparation of cylinders
The cylinders shall be emptied of any liquid and depressuri
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