EN 16728:2016+A2:2020
(Main)LPG equipment and accessories - Transportable refillable LPG cylinders other than traditional welded and brazed steel cylinders - Periodic inspection
LPG equipment and accessories - Transportable refillable LPG cylinders other than traditional welded and brazed steel cylinders - Periodic inspection
This European Standard specifies procedures for periodic inspection and testing, for transportable refillable LPG cylinders with a water capacity from 0,5 l up to and including 150 l.
This European Standard is applicable to the following:
- welded steel LPG cylinders manufactured to an alternative design and construction, see EN 14140 or equivalent standard;
- welded aluminium LPG cylinders, see EN 13110 or equivalent standard;
- composite LPG cylinders, see EN 14427 or equivalent standard;
- over-moulded cylinders designed and manufactured according to EN 1442 or EN 14140, see Annex F.
NOTE The requirements of RID/ADR take precedence over those of this standard in the case of cylinders complying with that regulation, including pi marked cylinders.
This European Standard does not apply to cylinders permanently installed in vehicles.
Flüssiggas-Geräte und Ausrüstungsteile - Ortsbewegliche, wiederbefüllbare Flaschen für Flüssiggas (LPG), ausgenommen geschweißte und hartgelötete Stahlflaschen - Wiederkehrende Inspektion
Diese Europäische Norm legt Verfahren für die wiederkehrende Inspektion und Prüfung von ortsbeweglichen, wiederbefüll¬baren Flaschen für Flüssiggas (LPG) mit einem Fassungsraum von 0,5 l bis einschließlich 150 l fest.
Diese Europäische Norm gilt für:
- geschweißte Flaschen aus Stahl für Flüssiggas (LPG), die mit alternativer Gestaltung und Konstruktion hergestellt wurden, siehe EN 14140 oder eine gleichwertige Norm;
- geschweißte Flaschen aus Aluminium für Flüssiggas (LPG), siehe EN 13110 oder eine gleichwertige Norm;
- Flüssiggasflaschen aus Verbundwerkstoff, siehe EN 14427 oder eine gleichwertige Norm;
- umformte Flaschen, gestaltet und hergestellt nach EN 1442 oder EN 14140, siehe Anhang F.
ANMERKUNG Für Flaschen, die den Vorschriften der/des RID/ADR entsprechen sowie für Flaschen mit der Kennzeichnung "pi", haben die in der/dem RID/ADR angegebenen Anforderungen Vorrang gegenüber den Anforderungen in der vorliegenden Norm.
Diese Europäische Norm gilt nicht für Flaschen, die dauerhaft in Fahrzeugen eingebaut sind.
Équipements pour GPL et leurs accessoires - Bouteilles transportables et rechargeables pour GPL autres que celles en acier soudé et brasé - Contrôle périodique
La présente Norme européenne spécifie des modes opératoires pour le contrôle et les essais périodiques des bouteilles transportables et rechargeables pour GPL d'une capacité en eau comprise entre 0,5 l et 150 l.
La présente Norme européenne s'applique aux éléments suivants :
- bouteilles pour GPL en acier soudé, fabriquées selon une conception et une fabrication différentes ; voir EN 14140 ou une norme équivalente ;
- bouteilles pour GPL en aluminium soudé ; voir EN 13110 ou une norme équivalente ;
- bouteilles pour GPL en matériau composite ; voir EN 14427 ou une norme équivalente ;
- bouteilles surmoulées conçues et fabriquées selon l'EN 1442 ou l'EN 14140 ; voir Annexe F.
NOTE Les exigences des règlements RID/ADR prévalent sur les dispositions de la présente norme dans le cas de bouteilles conformes à ces règlements, y compris les bouteilles comportant un marquage pi.
La présente Norme européenne ne s'applique pas aux bouteilles installées en permanence dans des véhicules.
Oprema in pribor za utekočinjeni naftni plin (UNP) - Premične, ponovno polnljive jeklenke za UNP, ki niso varjene in trdo spajkane - Periodična kontrola (vključno z dopolnilom A2)
Ta evropski standard določa postopke za periodično kontrolo in preskušanje premičnih, ponovno polnljivih jeklenk za utekočinjeni naftni plin (LPG) z vodno kapaciteto od 0,5 l do vključno 150 l.
Ta evropski standard se uporablja za:
– varjene jeklenke za utekočinjeni naftni plin z alternativno zasnovo in konstrukcijo (glej standard EN 14140 ali enakovreden standard);
– varjene aluminijaste jeklenke za utekočinjeni naftni plin (glej standard EN 13110 ali enakovredni standard);
– kompozitne jeklenke za utekočinjeni naftni plin (glej standard EN 14427 ali enakovredni standard);
– prelite jeklenke, zasnovane in izdelane v skladu s standardom EN 1442 ali EN 14140 (glej dodatek F).
OPOMBA: V primeru jeklenk, ki izpolnjujejo te predpise (vključno z jeklenkami z oznako pi), imajo pred zahtevami tega standarda prednost zahteve RID/ADR.
Ta evropski standard se ne uporablja za jeklenke, trajno nameščene v vozila.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 16728:2016+A1:2018
Oprema in pribor za utekočinjeni naftni plin (UNP) - Premične, ponovno polnljive
jeklenke za UNP, ki niso varjene in trdo spajkane - Periodična kontrola (vključno z
dopolnilom A2)
LPG equipment and accessories - Transportable refillable LPG cylinders other than
traditional welded and brazed steel cylinders - Periodic inspection
Flüssiggas-Geräte und Ausrüstungsteile - Ortsbewegliche, wiederbefüllbare Flaschen für
Flüssiggas (LPG), ausgenommen geschweißte und hartgelötete Stahlflaschen -
Wiederkehrende Inspektion
Équipements pour GPL et leurs accessoires - Bouteilles transportables et rechargeables
pour GPL autres que celles en acier soudé et brasé - Contrôle périodique
Ta slovenski standard je istoveten z: EN 16728:2016+A2:2020
ICS:
23.020.35 Plinske jeklenke Gas cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 16728:2016+A2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 23.020.35 Supersedes EN 16728:2016+A1:2018
English Version
LPG equipment and accessories - Transportable refillable
LPG cylinders other than traditional welded and brazed
steel cylinders - Periodic inspection
Équipements pour GPL et leurs accessoires - Bouteilles Flüssiggas-Geräte und Ausrüstungsteile -
transportables et rechargeables pour GPL autres que Ortsbewegliche, wiederbefüllbare Flaschen für
celles en acier soudé et brasé - Contrôle périodique Flüssiggas (LPG), ausgenommen geschweißte und
hartgelötete Stahlflaschen - Wiederkehrende
Inspektion
This European Standard was approved by CEN on 19 April 2018 and includes Amendment 2 approved by CEN on 6 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 16728:2016+A2:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements for periodic inspection . 9
4.1 General . 9
4.2 Steel and aluminium cylinders . 10
4.3 Over-moulded cylinders . 10
4.4 Composite cylinders . 10
4.5 Rejected cylinders . 10
5 Inspections and tests . 12
5.1 General . 12
5.2 External visual inspection . 12
5.2.1 Preparation for external visual inspection. 12
5.2.2 Inspection procedure . 12
5.2.3 Rejection criteria . 13
5.3 Proof pressure test . 13
5.3.1 General . 13
5.3.2 Hydraulic proof pressure test. 14
5.3.3 Pneumatic proof test and leak test . 15
5.4 Check of the internal condition of the cylinder . 16
5.4.1 Welded aluminium and steel cylinders of alternative design and construction . 16
5.4.2 Check of the internal condition of composite cylinders . 16
5.5 Inspection of cylinder threads . 17
5.5.1 General . 17
5.5.2 Internal threads . 17
5.5.3 External threads . 17
5.5.4 Damaged threads . 17
5.6 Inspection of valves . 17
6 Final operations . 18
6.1 General . 18
6.2 Valving . 18
6.3 Tare mass . 18
6.4 Marking . 18
6.5 Purging . 18
7 Repair of cylinders . 18
8 Records . 19
Annex A (normative) Specific requirements for external visual inspection for welded steel
LPG cylinders in accordance with EN 14140 or equivalent standard . 20
A.1 General . 20
A.2 Procedure for establishing rejection criteria carbon steel cylinders . 20
A.3 Rejection criteria for stainless steel cylinders . 23
Annex B (normative) Specific requirements for external visual inspection of welded
aluminium LPG cylinders . 25
Annex C (normative) Specific requirements for visual inspection of composite LPG
cylinders . 28
C.1 Establishment of rejection criteria . 28
C.1.1 General . 28
C.1.2 Procedure . 28
C.2 Examples of rejection criteria . 28
C.2.1 Cylinders without a metallic liner . 28
C.2.2 Cylinders with a metallic liner . 33
Annex D (informative) Conditions for 15-year periodic inspection interval of welded steel
st
cylinders manufactured before 1 January 2015 . 37
D.1 General . 37
D.2 Concept of control. 37
D.3 Conditions . 37
Annex E (informative) Guidance on conditions for 10-year periodic inspection interval of
composite cylinders . 39
Annex F (normative) Specific Periodic inspection procedure for over-moulded cylinders
(OMC) . 40
F.1 General . 40
F.1.1 Introduction. 40
F.1.2 Valve . 40
F.1.3 Marking and records . 40
F.2 Periodic inspection . 40
F.2.1 General . 40
F.2.2 External visual inspection . 42
F.2.3 Burst test . 43
F.2.4 Supplementary tests . 43
F.2.5 F.2.5 Statistical evaluation of test results – Method and minimum requirements . 44
F.2.6 F.2.6 Measures if the acceptance criteria are not met . 46
F.2.7 F.2.7 Periodic inspection tests reports and records . 47
Annex G (informative) Example of an Over-Moulded Cylinder . 48
Bibliography . 50
European foreword
This document (EN 16728:2016+A2:2020) has been prepared by Technical Committee CEN/TC 286
“Liquefied petroleum gas equipment and accessories”, the secretariat of which is held by NSAI.
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 [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document includes Amendment 1 approved by CEN on 19 April 2018.
This document includes Amendment 2 approved by CEN on 6 March 2020.
This document !supersedes EN 16728:2016" and deals with the periodic inspection requirements
for transportable refillable LPG cylinders that are not covered by EN 1440.
#This document supersedes EN 16728:2016+A1:2018.$
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
The start and finish of text introduced or altered by amendment is indicated in the text by tags #$.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
This European Standard has been submitted for reference into the RID [1] and the technical annexes of
the ADR [2].
NOTE These regulations take precedence over any clause of this standard. It is emphasized that RID/ADR are
being revised regularly at intervals of two years which may lead to temporary non- compliances with the clauses
of this standard.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
The primary objective of the periodic inspection of transportable refillable liquefied petroleum gas
(LPG) cylinders is that, on the completion of the tests, the cylinders may be re-introduced into service
for a further period of time.
The new designs of LPG cylinders have led to the development of alternative methods of inspection.
This European Standard has been prepared to reflect the current methodology for periodic inspection
of LPG cylinders, and is based on extensive operating experience.
This European 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.
Protection of the environment is a key political issue in Europe and elsewhere, for CEN/TC 286 this is
covered in CEN/TS 16765 [3], and this Technical Specification should be read in conjunction with this
standard.
It has been assumed in the drafting of this European Standard that the execution of its provisions is
entrusted to appropriately qualified and experienced people.
Where judgements are called for, it has been assumed that they are made by competent persons who
have been specifically trained for the tasks.
1 Scope
This European Standard specifies procedures for periodic inspection and testing, for transportable
refillable LPG cylinders with a water capacity from 0,5 l up to and including 150 l.
This European Standard is applicable to the following:
— welded steel LPG cylinders manufactured to an alternative design and construction, see EN 14140
or equivalent standard;
— welded aluminium LPG cylinders, see EN 13110 or equivalent standard;
— composite LPG cylinders, see EN 14427 or equivalent standard;
— over-moulded cylinders designed and manufactured according to EN 1442 or EN 14140,
see Annex F.
NOTE The requirements of RID/ADR take precedence over those of this standard in the case of cylinders
complying with that regulation, including pi marked cylinders.
This European Standard does not apply to cylinders permanently installed in vehicles.
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.
EN 837-1:1996, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology,
requirements and testing
EN 837-3:1996, Pressure gauges — Part 3: Diaphragm and capsule pressure gauges — Dimensions,
metrology, requirements and testing
EN 1442, LPG equipment and accessories — Transportable refillable welded steel cylinders for LPG —
Design and construction
EN 10028-7, Flat products made of steels for pressure purposes — Part 7: Stainless steels
EN 12816, LPG equipment and accessories — Transportable refillable LPG cylinders — Disposal
EN 13110, LPG equipment and accessories — Transportable refillable welded aluminium cylinders for
liquefied petroleum gas (LPG) — Design and construction
EN 14140:2014, LPG equipment and accessories — Transportable refillable welded steel cylinders for
LPG — Alternative design and construction
EN 14427:2014, LPG equipment and accessories — Transportable refillable fully wrapped composite
cylinders for LPG — Design and construction
EN 14894, LPG equipment and accessories — Cylinder and drum marking
EN 14912, LPG equipment and accessories — Inspection and maintenance of LPG cylinder valves at time of
periodic inspection of cylinders
EN ISO 4628-3:2003, Paints and varnishes — Evaluation of degradation of coatings — Designation of
quantity and size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of
degree of rusting (ISO 4628-3:2003)
EN ISO 14245, Gas cylinders — Specifications and testing of LPG cylinder valves — Self-closing
(ISO 14245)
EN ISO 15995, Gas cylinders — Specifications and testing of LPG cylinder valves — Manually operated
(ISO 15995)
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed
by acceptance quality limit (AQL) for lot-by-lot inspection
ISO 16269-6:2014, Statistical interpretation of data — Part 6: Determination of statistical tolerance
intervals
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
competent authority
authority or authorities or any other body or bodies designated as such in each State and in each
specific case in accordance with domestic law
3.2
competent person
person which by combination of appropriate qualification, training, experience, and resources, is able to
make objective judgments on the subject
3.3
inspection body
independent inspection and testing body approved by the competent authority
3.4
liquefied petroleum gas
LPG
low pressure gas composed of one or more light hydrocarbons which are assigned to UN 1011,
UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane,
butane isomers, butene with traces of other hydrocarbon gases
#
3.5
minor repair
operations that include cleaning and replacement of components accessible without any dismantling of
the valve (e.g. outlet seal, excess flow device) and that do not affect the integrity of the pressure
receptacle$
!
3.6
over-moulded cylinder
OMC
pressure receptacle intended for the carriage of LPG of a water capacity not exceeding 13 l made of a
coated steel inner cylinder with an over-moulded protective case made from cellular plastic, which is
non removable and bonded to the outer surface of the steel cylinder wall"
3.7
periodic inspection
activities carried out at defined intervals, such as examining, measuring, testing or gauging the
characteristics of a pressure vessel and comparing these with specified requirements
3.8
protective casing
layer of protective material which gives mechanical protection which, either cannot be removed
without destroying it or is only removable with special tools or is bonded to the cylinder wall
Note 1 to entry: This definition can be applied to cylinders with over-moulded layers or with separate casings.
!
3.9
reconditioning
major repairs to cylinders, which can include hot work, welding or de-denting carried out by specialists
away from potential sources of flammable air/gas mixture"
!
3.10"
tare mass
sum of the mass of the empty cylinder, 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. fixed
valve guard
#
3.11
basic population of OMC
production of cylinders from only one over-moulding manufacturer using new inner cylinders
manufactured by only one manufacturer within one calendar year, based on the same design type, the
same materials and production processes
3.12
sub-group of OMC
part of a basic population, owned by one single owner
Note 1 to entry: A basic population is split into sub-groups, one per owner. If the whole basic population is owned
by one owner, the sub-group equals the basic population.$
4 Requirements for periodic inspection
4.1 General
The interval between periodic inspections shall be dependent on the content of a written scheme.
Periodic inspections/tests shall be carried out by a competent person under the control of an inspection
body based on a written scheme and in accordance with the procedures specified in Table 1.
NOTE 1 A written scheme describes work procedures, criteria, responsibilities and other minimum
requirements.
NOTE 2 With the agreement of the competent authority an alternative to the proof pressure test of cylinders is
acoustic emission testing, ultrasonic examination or a combination of both. !deleted text"
NOTE 3 Tests can be performed in any order as determined by the written scheme.
4.2 Steel and aluminium cylinders
The maximum interval between periodic inspections for welded steel cylinders in conformance with
EN 14140 or an equivalent standard and, welded aluminium LPG cylinders in conformance with
EN 13110, or equivalent standard, shall be 10 years.
st
However for welded LPG steel cylinders in conformance with EN 14140 manufactured before the 1
January 2015, this maximum interval can be extended to 15 years, provided the conditions of Annex D
are fully met and approval from the relevant competent authority(ies) has been given.
4.3 Over-moulded cylinders
For over-moulded cylinders the interval is determined in accordance with Table 1.
4.4 Composite cylinders
For composite cylinders, the determination of the interval between periodic inspections shall depend
on the content of a written scheme that shall be approved by a competent authority, or body designated
by this authority, which issued the type approval.
Annex E provides guidance on the requirements for 10-year periodic inspection interval for composite
cylinders.
4.5 Rejected cylinders
Rejected cylinders shall be segregated and be either reconditioned, re-tested or rendered unserviceable.
The decision to render a cylinder unserviceable may be taken at any stage during the periodic
inspection procedure. With agreement by the owner, a cylinder shall be rendered unserviceable in
accordance with EN 12816 such that it cannot be re-issued into service as a pressure vessel.
NOTE In some countries, render unserviceable means scrapping.
Table 1 — Requirements for periodic inspection
Cylinder types Maximum periodic Procedures
inspection interval
— External visual inspection as described in 5.2 and
Welded steel 10 years
Annex A;
cylinders in
conformance with
— Proof pressure test (hydraulic proof pressure test
EN 14140, or
or, with the agreement of the competent
equivalent standard.
authority, a pneumatic proof test and leak test) as
— 10 years; or
Welded steel described in 5.3;
cylinders in
— 15 years with the
— Internal condition check as described in 5.4.1 and
conformance with
agreement of the
Annex A;
EN 14140 or
competent
equivalent standard –
authority and
— Inspection of threads as described in 5.5;
manufactured before
under the
st
1 January 2015.
conditions of — Inspection of valves as described in 5.6.
Annex D.
— External visual inspection as described in 5.2 and
Welded aluminium 10 years
Annex B;
cylinders.
— Proof pressure tests (hydraulic proof pressure
test or, with the agreement of the competent
authority, a pneumatic proof test and leak test) as
described in 5.3;
— Internal condition check as described in 5.4.1;
— Inspection of threads as described in 5.5;
— Inspection of valves as described in 5.6.
— External visual inspection as described in 5.2 and
Composite cylinders As determined by the
Annex C;
competent authority.
Guidance for 10 year
— Proof pressure test (hydraulic proof pressure test
periodic inspection
or, with the agreement of the competent
interval described in
authority, a pneumatic proof test and leak test) as
Annex E.
described in 5.3;
— Internal condition check as described in 5.4.2;
— Inspection of threads as described in 5.5;
— Inspection of valves as described in 5.6.
— External visual inspection as described in F.2.2;
Over-moulded Annex F provides
cylinders specific additional
— Burst Tests as described in F.2.3;
inspection
requirements with
Cylinder types Maximum periodic Procedures
inspection interval
destructive tests with — Internal condition check as described in 5.4;
an interval of maximum
— Inspection of threads as described in 5.5
3 years after putting in
service and thereafter
— Inspection of valves as described in 5.6.
every 5 years.
5 Inspections and tests
5.1 General
Relevant cylinder data shall be identified before any inspections or tests are carried out.
Cylinders which cannot be safely emptied of gas shall be set aside for special handling.
Cylinders with inoperative or blocked valves shall be set aside for safe valve removal.
Before preparing for inspection, manufacturer's guidelines shall be taken into account to avoid any
damage to the cylinders.
Any chemical solutions and/or cleaning methods used shall be selected to ensure that they do not
adversely affect the cylinder material.
5.2 External visual inspection
5.2.1 Preparation for external visual inspection
a) If necessary, the cylinder shall be cleaned and have all loose coatings or labels, corrosion products,
tar, oil or other foreign matter removed from its external surface.
b) Care shall be taken to avoid damaging the cylinder.
c) When cylinders are treated by a process that might remove cylinder material, the inspection body
shall decide whether a thickness test is required, e.g. ultrasonic thickness check.
NOTE Cleaning methods include wire brushing, shot blasting (in accordance with EN ISO 8501-1 ![4]"
and the EN ISO 8504 ![5]" series), water jet cleaning, chemical cleaning or other suitable methods, that do
not adversely affect any part of the cylinders.
5.2.2 Inspection procedure
5.2.2.1 Welded steel and welded aluminium LPG cylinders:
Cylinders shall be inspected for:
a) dents, cuts, gouges, bulges, cracks, laminations or punctures, while applying the criteria for
rejection in Annex A and Annex B, as appropriate;
b) corrosion while applying the criteria for rejection in A.2 and Table B.2 as appropriate, giving special
attention to areas where water can be trapped;
EXAMPLE At the base of the cylinder;
the junction between the cylindrical shell and the foot-ring;
the junction between the cylindrical shell and the valve guard or shroud;
the cylindrical shell and the valve guard or shroud; and
hidden corrosion e.g. under handles, applying the criteria for rejection given in Annex A and Annex B as
appropriate.
c) other defects (e.g. depressed bung or fire damage), while applying the criteria for rejection given in
Annex A and Annex B as appropriate;
d) integrity of all permanent attachments including protective casing where relevant; and
e) integrity of all mandatory permanent markings.
5.2.2.2 Composite cylinders:
Cylinders shall be inspected for:
a) cuts, gouges, bulges, cracks or de-laminations, while applying the criteria for acceptance/rejection
in Annex C;
b) other defects e.g. depressed bung or fire damage, while applying the criteria for
acceptance/rejection in Annex C;
c) integrity of all permanent attachments including protective casing; and
d) integrity of the mandatory permanent marking.
5.2.3 Rejection criteria
Details of defects and rejection limits are described in:
— Annex A for specific requirements for welded steel LPG cylinders manufactured in accordance with
EN 14140 or equivalent standard;
— Annex B for specific requirements for welded aluminium LPG cylinders; and
— Annex C for specific requirements for composite LPG cylinders.
5.3 Proof pressure test
5.3.1 General
The test shall consist of one of the proof pressure tests, as described in 5.3.2 and 5.3.3. #deleted
text$ !The pneumatic proof test shall only be implemented where such an operation does not
entail any danger."
#NOTE See also ADR, chapter 6.2.1.6.1.$
Pressure gauges that are used to read the cylinder test pressure shall be in accordance with EN 837-
1:1996 and EN 837-3:1996, accuracy class 1,6 or better. They shall be calibrated or checked for
accuracy against a master gauge at regular intervals and not less frequently than once every six months.
The master gauge shall be re-calibrated in accordance with national requirements.
All joints within the system shall be leak tight.
The test equipment shall not restrict the expansion of the cylinder.
5.3.2 Hydraulic proof pressure test
5.3.2.1 General
A non-corrosive liquid, that is compatible with the material of construction of the cylinder, shall be used
as the test medium.
5.3.2.2 Preparation of cylinders
a) Cylinders shall be depressurized in a safe and controlled manner before proceeding.
b) The external surface of the cylinder shall be in such condition that any leak can be detected. If the
cleaning method involves the wetting of the outside surface or if the outside surface is wet due to
outdoor storage conditions, the outside surface shall be completely dried before commencing the
test procedure.
5.3.2.3 Test equipment
The design and installation of the equipment and the cylinders connected to it shall ensure that no air is
trapped in the system.
A device shall be fitted to the test equipment to ensure that no cylinder is subjected to pressure in
excess of its test pressure by more than the tolerance given in 5.3.2.4.
5.3.2.4 Procedure
a) Where appropriate, cylinders shall be positioned so that the welds are visible during the test.
b) The test pressure shall be at least the test pressure marked on the cylinder.
c) The pressure shall be gradually increased in the cylinder until the test pressure is reached.
d) The test pressure shall not be exceeded by more than 20 % or 6 bar, whichever is the least. More
than one cylinder can be tested at a time provided they all have a test pressure within the tolerance
specified. If the cylinder is tested at a higher pressure than that marked, the owner of the cylinder
shall calculate the maximum pressure not to be exceeded to ensure that the general membrane
stress in the cylinder wall does not exceed 95 % of the guaranteed minimum yield strength of the
material used in the finished cylinder.
e) The test pressure shall be held for the time necessary to inspect the cylinder and examine it for any
leak and/or other defects, but no less than 15 s.
f) If there is leakage in the pressure system, it shall be corrected and the cylinders re-tested.
g) Cylinders that do not leak or show any permanent visible distortion after the pressure has been
released shall be deemed to have passed this test. Cylinders, showing visible defects, shall be
examined by a competent person.
h) Cylinders that fail this test shall be rejected.
i) Records of rejected cylinders shall be maintained !for a minimum of 10 years".
5.3.3 Pneumatic proof test and leak test
5.3.3.1 Preparation of cylinders
a) Where a cylinder has to be depressurized, it shall be carried out in a safe and controlled manner
before proceeding.
b) Repainting before the pneumatic test shall be limited to a primer coat. The finishing coat shall be
applied after the test in order not to mask potential leaks.
5.3.3.2 Procedure
5.3.3.2.1 Proof test
a) Cylinders shall be tested in a safe enclosure to protect against rupture under pneumatic pressure.
Adequate safety procedures and measures, e.g. hearing protection, shall be adopted to protect
personnel in charge of the test.
b) The pressure of the test for a RID/ADR cylinder shall be at least the test pressure marked on the
cylinder.
c) Where a separate pressure relief valve is fitted, an adequate margin of safety shall be maintained
between the pneumatic proof test pressure and the pressure setting of the pressure relief valve.
Where necessary, the pressure relief valve shall be removed and the port plugged for testing.
d) After the cylinder has been placed in a safe enclosure, it shall be charged with the pneumatic test
medium (e.g. air, nitrogen) to the test pressure and held at that pressure for at least 5 s. The gas to
be used for testing shall be non-flammable to avoid any internal explosion risk. The cylinder shall
pass the proof test if it does not burst. The cylinder shall then be isolated from the pressure source.
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e) The test pressure shall be held for the time necessary to inspect the cylinder and examine it for any
leak and/or other defects, but not less than 5 s.
f) If there is leakage in the pressure system, it shall be corrected and the cylinders re-tested.
g) Cylinders that do not leak or show any permanent visible distortion after the pressure has been
released shall be deemed to have passed this test. All other cylinders shall be set aside and
examined by a competent person.$
NOTE Care needs to be taken to avoid corrosion if full water immersion is used.
!
h) Cylinders that fail this test shall be rejected.
i) Records of rejected cylinders shall be maintained for a minimum of 10 years."
5.3.3.2.2 Leak test
a) The pressure shall be reduced to not less than 6 bar. The pressure drop shall be monitored in a safe
and controlled manner.
b) The reduced pressure shall be held for as long as it is necessary to inspect the cylinder and check
for any leaks.
c) Cylinders that do not leak or show any visible permanent distortion after the pressure has been
released shall pass this test.
NOTE Care needs to be taken to avoid corrosion if full water immersion is used.
d) Cylinders that fail this test shall be rejected.
e) Records of rejected cylinders shall be maintained !for a minimum of 10 years".
5.4 Check of the internal condition of the cylinder
5.4.1 Welded aluminium and steel cylinders of alternative design and construction
5.4.1.1 General
The check shall consist of one of the following tests, see 5.4.1.2 and 5.4.1.3.
5.4.1.2 Internal visual inspection
5.4.1.2.1 Preparation of cylinders
a) Cylinders shall be depressurized in a safe and controlled manner before proceeding.
b) Valves shall be removed from cylinders.
c) Where necessary, residual liquid and possible foreign matter shall be removed from the inside of
the cylinder.
5.4.1.2.2 Procedure
a) Cylinders shall be inspected internally for any sign of corrosion or other defects that can affect their
integrity, using a safe inspection lighting system with appropriate internal illumination (e.g. an
endoscope).
b) Cylinders showing signs of internal corrosion, except those having only a film layer of surface rust,
shall be removed for further detailed evaluation in accordance with Table A.2.
c) If cleaning is required, care shall be taken to avoid damaging the cylinder walls. Cylinders shall be
re-inspected after cleaning.
5.4.1.3 Check of the minimum wall thickness
The wall thickness shall be measured e.g. by ultrasonic method, according to the procedure agreed with
the competent authority, in a sufficient number of places, in order to guarantee the minimum wall
thickness of the entire cylinder. The measurements shall be compared to the required calculated
minimum wall thickness. If one of the measurements is lower than the required calculated minimum
wall thickness, the cylinder shall be rejected.
The required calculated minimum wall thickness shall be provided by the owner of the cylinder.
5.4.2 Check of the internal condition of composite cylinders
5.4.2.1 General
An internal visual inspection shall be performed on cylinders to detect internal defects or the presence
of foreign matter.
For translucent/transparent composite cylinders, the internal visual inspection can be made from
outside without depressurizing the cylinder or removing the valve, provided that the internal defects, as
defined by the manufacturer, can be identified from the outside.
5.4.2.2 Preparation of cylinders
a) Cylinders shall be depressurized in a safe and controlled manner before proceeding.
b) Care shall be taken when clamping composite cylinders in order to avoid damage.
5.4.2.3 Procedure
a) Cylinders shall be inspected internally for any sign of corrosion or other defects that could affect its
integrity, using a safe inspection lighting system with appropriate internal illumination (e.g. an
endoscope).
b) Cylinders showing signs of internal corrosion (e.g. general corrosion, local corrosion, chain pitting
or line corrosion, crevice corrosion), except those having only superficial surface rust, shall be
removed for further detailed evaluation.
c) Cylinders showing signs of internal defects, e.g. cracks, damaged liner or chemical attack, shall be
scrapped.
d) If cleaning is required, care shall be taken to avoid damaging the cylinder walls. Cylinders shall be
re-inspected after cleaning.
5.5 Inspection of cylinder threads
5.5.1 General
When the valve (and any other fitting) is removed during periodic inspection, the cylinder threads shall
be inspected in accordance with 5.5.2, 5.5.3 and 5.5.4.
5.5.2 Internal threads
The internal threads of the cylinder shall be visually inspected and cleaned of any foreign matter. The
leak-tightness of the valve onto the cylinder shall be checked after valving.
NOTE The leak-tightness test can be performed at the test station or at the filling station.
5.5.3 External threads
External neck threads, which are required for operational reasons, shall be examined for integrity and
for thread damage.
5.5.4 Damaged threads
Where necessary and where the design permits, damaged threads shall be repaired by a competent
person or the cylinder shall be rendered unserviceable in accordance with EN 12816.
5.6 Inspection of valves
Valves shall be inspected, repaired, refurbished or scrapped in accordance with EN 14912 or equivalent
standard referred to in the RID/ADR.
6 Final operations
6.1 General
After hydraulic testing, effective precautions shall be taken to prevent internal corrosion and/or
contamination.
6.2 Valving
If the valve is removed for inspection or refurbishment, a new, inspected or refurbished valve, suitable
for the intended use, shall be fitted to the cylinder using a sealing material/system and the optimum
torque necessary to ensure a seal between the v
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