Pressure receptacles and open cryogenic receptacles shall be filled according to the working pressures,
filling ratios and provisions specified in the appropriate packing instruction for the specific substance
being filled. Reactive gases and gas mixtures shall be filled to a pressure such that if complete
decomposition of the gas occurs, the working pressure of the pressure receptacle shall not be
exceeded. Bundles of cylinders shall not be filled in excess of the lowest working pressure of any
given cylinder in the bundle.

 

Pressure receptacles, including their closures, shall conform to the design, construction, inspection
and testing requirements detailed in Chapter 6.2. When outer packagings are prescribed, the pressure
receptacles and open cryogenic receptacles shall be firmly secured therein. Unless otherwise specified
in the detailed packing instructions, one or more inner packagings may be enclosed in one outer
packaging.

Valves shall be designed and constructed in such a way that they are inherently able to withstand
damage without release of the contents or shall be protected from damage which could cause
inadvertent release of the contents of the pressure receptacle, by one of the following methods (see
also table of standards at the end of this section):
(a) Valves are placed inside the neck of the pressure receptacle and protected by a threaded plug or
cap;
(b) Valves are protected by caps. Caps shall possess vent-holes of sufficient cross-sectional area to
evacuate the gas if leakage occurs at the valves;
(c) Valves are protected by shrouds or guards;
(d) Pressure receptacles are carried in frames, (e.g. cylinders in bundles); or
(e) Pressure receptacles are carried in protective boxes. For UN pressure receptacles the packaging
as prepared for carriage shall be capable of meeting the drop test specified in 6.1.5.3 at the
packing group I performance level.

Non-refillable pressure receptacles shall:
(a) be carried in an outer packaging, such as a box or crate, or in shrink-wrapped or stretchwrapped
trays;
(b) be of a water capacity less than or equal to 1.25 litres when filled with flammable or toxic gas;
(c) not be used for toxic gases with an LC50 less than or equal to 200 ml/m3; and
(d) not be repaired after being put into service.

Refillable pressure receptacles, other than cryogenic receptacles, shall be periodically inspected
according to the provisions of 6.2.1.6, or 6.2.3.5.1 for non UN receptacles, and packing instruction
P200, P205 or P206 as applicable. Pressure relief valves for closed cryogenic receptacles shall be
subject to periodic inspections and tests according to the provisions of 6.2.1.6.3 and packing
instruction P203. Pressure receptacles shall not be filled after they become due for periodic inspection
but may be carried after the expiry of the time-limit for purposes of performing inspection or disposal,
including the intermediate carriage operations.

Repairs shall be consistent with the fabrication and testing requirements of the applicable design and
construction standards and are only permitted as indicated in the relevant periodic inspection
standards specified in chapter 6.2. Pressure receptacles, other than the jacket of closed cryogenic
receptacles, shall not be subjected to repairs of any of the following:
(a) weld cracks or other weld defects;
(b) cracks in walls;
(c) leaks or defects in the material of the wall, head or bottom.

Receptacles shall not be offered for filling:
(a) when damaged to such an extent that the integrity of the receptacle or its service equipment
may be affected;
(b) unless the receptacle and its service equipment has been examined and found to be in good
working order; and
(c) unless the required certification, retest, and filling marks are legible.

Filled receptacles shall not be offered for carriage:
(a) when leaking;
(b) when damaged to such an extent that the integrity of the receptacle or its service equipment
may be affected;
(c) unless the receptacle and its service equipment has been examined and found to be in good
working order; and
(d) unless the required certification, retest, and filling marks are legible.

Owners shall, on the basis of a reasoned request from the competent authority, provide it with all the
information necessary to demonstrate the conformity of the pressure receptacle in a language easily
understood by the competent authority. They shall cooperate with that authority, at its request, on any
action taken to eliminate non-conformity of the pressure receptacles which they own.

For UN pressure receptacles, the ISO standards listed below shall be applied. For other pressure
receptacles, the requirements of section 4.1.6 are considered to have been complied with if the
following standards, as relevant, are applied:
 
 

Applicable paragraphs

Reference

Title of document

4.1.6.2

ISO 11114-1:2012

Gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 1: Metallic Materials

ISO 11114-2:2013

Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 2: Non-metallic Materials

4.1.6.4

ISO 11621:1997

Gas cylinders – Procedures for change of gas service

NOTE: The EN version of this ISO standard fulfils the requirements and may also be used.

4.1.6.8 Valves with inherent protection

Annex A of ISO 10297:2006 or annex A of ISO 10297:2014

Gas cylinder – Refillable gas cylinder valves – Specification and type testing

NOTE: The EN version of this ISO standard fulfils the requirements and may also be used.

EN 13152:2001

+ A1:2003

Testing and specifications of LPG cylinder valves – self closing

EN 13153:2001

+ A1:2003

Testing and specifications of LPG cylinder valves – manually operated

EN ISO 14245:2010

Gas cylinders – Specifications and testing of LPG cylinder valves – Self closing (ISO 14245:2006)

EN ISO 15995:2010

Gas cylinders – Specifications and testing of LPG cylinder valves – Manually operated (ISO 15995:2006)

4.1.6.8 (b) and (c)

either ISO 11117:1998 or ISO 11117:2008 + Cor 1:2009

Gas Cylinders – Valve Protection caps and valve guards for industrial and medical gas cylinders – Design construction and tests

EN 962:1996 + A2:2000

Valve protection caps and valve guards for industrial and medical gas cylinders – Design, construction and tests

ISO 16111:2008

Transportable gas storage devices – Hydrogen absorbed in reversible metal hydride

 

Special packing provisions for organic peroxides (Class 5.2) and self-reactive substances of Class 4.1

For organic peroxides, all receptacles shall be "effectively closed". Where significant internal pressure
may develop in a package by the evolution of a gas, a vent may be fitted, provided the gas emitted
will not cause danger, otherwise the degree of filling shall be limited. Any venting device shall be so
constructed that liquid will not escape when the package is in an upright position and it shall be able
to prevent ingress of impurities. The outer packaging, if any, shall be so designed as not to interfere
with the operation of the venting device.

Use of packagings (except IBCs)

Packagings for organic peroxides and self-reactive substances shall conform to the requirements of
Chapter 6.1 and shall meet its test requirements for packing group II.

The packing methods for organic peroxides and self-reactive substances are listed in packing
instruction 520 and are designated OP1 to OP8. The quantities specified for each packing method are
the maximum quantities authorized per package.
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