Check out our FAQs. This standard has been revised by ISO Abstract ISO deals with seamless steel transportable gas cylinders single or those that comprise a bundle intended for compressed and liquefied gases under pressure, of water capacity from 0,5 l up to l; it also applies, as far as practical, to cylinders of less than 0,5 l water capacity. Status : Withdrawn. Publication date : Life cycle Previously Withdrawn.
The retester symbol is the symbol of the inspection body or test station. The retest date is the date of the current test, which shall be indicated by the year and month. Annex G provides one example of an existing system for indicating retest dates; other systems are in use, and the same systems are used with different colours for the same year.
Before the cylinder is re-introduced into service, the intended contents shall be identified. This need not be part of the periodic inspection and test procedure. If painting is required, care shall be exercised in accordance with If a change of gas service is involved, care shall be taken to follow the requirements of ISO A cylinder periodic inspection and test shall be recorded by test station personnel, and the following information shall be available for inspection:.
Additionally, it shall be possible to obtain the following items of information from records, which need not necessarily be kept on a single file, but will enable a particular cylinder to be uniquely traced. These items are:. The decision to reject a cylinder may be taken at any stage during the periodic inspection and test procedure. If it is impossible to recover a rejected cylinder, after notifying the owner the testing station shall make the cylinder unserviceable for holding gas under pressure so that it is impossible for any part of the cylinder, especially the shoulder, to be re-issued into service.
In case of any disagreement, ensure that the legal implication of the contemplated action is fully understood. The following information includes intervals as outlined in the United Nations Recommendations for the Transport of Dangerous Goods, Model Regulations , 13 th edition. The most current edition should be consulted. Gas cylinder defects may be physical, material or due to corrosion as a result of environmental or service conditions to which the cylinder has been subjected during its life.
The object of this annex is to give general guidelines to gas cylinder inspectors as to the application of rejection criteria. This annex applies to all cylinders, but those that have contained gases having special characteristics may require modified controls. Any defect in the form of a sharp notch may be removed by grinding, machining or other approved methods. Permanent attachments e. The cylinder may be subjected to environmental conditions that could cause external corrosion of the metal.
There is difficulty in presenting definite rejection limits in tabular form for all sizes and types of cylinders and their service conditions. The limits of rejection are usually established following considerable field experience. Extensive experience and judgment are required in evaluating whether cylinders that have corroded internally are safe and suitable for return to service.
It is important that the surface of the metal is cleaned of corrosion products prior to the inspection of the cylinder. The following procedures shall be carried out only by trained personnel. In view of the potential hazards in cylinders, this operation can lead to injury from stored energy release, fire and toxic hazards; hence, personnel shall take such precautions as deemed necessary for the work to be performed.
When the gas, if any, has been released and the pressure within the cylinder reduced to atmospheric pressure, and, in the case of liquefied gases, when there is no frost or dew on the outside of the cylinder, the valve may be removed after an additional check is made to establish that there is free passage through the valve. As indicated in Clause 6, a systematic check shall be made to establish that the passage through the valve is unobstructed.
The method adopted shall be a recognized procedure such as one of the following or one that provides equivalent safeguards:. If there is a positive difference, the cylinder may contain either liquefied gas under pressure or contaminants. Lack of a positive difference does not rule out the presence of a gas under pressure;. Only when it is established that there is no obstruction to gas flow in the cylinder valve, may the valve be removed.
Personal protection during de-valuing shall be assessed. The following methods are applicable for cylinders of non-toxic, non-flammable and non-chlorofluorocarbon non-CFC gases.
Appropriate safety precautions should be taken to ensure that no hazard results from the uncontrolled discharge of any residual gas. When a cylinder is found to have an obstructed gas passage in the valve, the cylinder shall be set aside and handled by specially trained personnel in this task as follows:. The operation shall be properly cooled particularly when handling oxidizing gases; or. The following methods are applicable to cylinders of toxic, flammable, air reactive, water reactive, oxidizing and CFC gases.
After release, containment and subsequent disposal shall be carried out safely and without impact to the environment. The principles of a suitable device are illustrated in Figure D. This procedure shall be performed in a controlled manner in such a way as to avoid personal injury; or. This annex gives details of the three methods for determining the volumetric expansion of steel gas cylinders:.
The water jacket volumetric expansion test shall be carried out on equipment with a leveling burette, with a fixed burette or with a weighing scale that contains water. This method of test necessitates enclosing the water-filled cylinder in a jacket that is also filled with water.
The total and any permanent volumetric expansion of the cylinder are measured as to the amount of water displaced by the expansion of the cylinder when under pressure and after the pressure is released. The water jacket shall be fitted with a safety device capable of releasing the energy from any cylinder that may burst at test pressure. Two methods for performing this test are described in E.
Other, equivalent methods are acceptable provided they are capable of measuring the total and, if any, permanent volumetric expansion of the cylinder. The procedure for this method of test is similar to that described in E. Apply pressure until test pressure is reached and record the burette reading. The reading above the datum is the total expansion and shall be recorded on the test certificate;. This method consists of measuring the amount of water passed into the cylinder under proof pressure, and on release of this pressure, measuring the water returned to the burette.
It is necessary to allow for the compressibility of water and the volume of the cylinder under test to obtain true volumetric expansion. No fall in pressure under this test is permitted. The water used should be clean and free of dissolved air. Any leakage from the system or the presence of free or dissolved air will result in false readings. The equipment should be installed as shown in Figure E.
This figure illustrates diagrammatically the different parts of the apparatus. The water supply pipe should be connected to an overhead tank as shown, or to some other supply giving a sufficient head of water. Figure E. The apparatus shall be arranged such that all air can be removed and that accurate readings can be determined of the volume of water required to pressurize the filled cylinder and of the volume expelled from the cylinder when depressurized.
In the case of larger cylinders, it may be necessary to augment the glass tube with metal tubes arranged in the manifold. All threads should be checked to ensure the thread diameters, form, length and taper are satisfactory. If threads show signs of distortion, deformation or burring, these faults should be rectified.
Excessive thread damage or serious deformation of the valve body, handwheel, spindle or other components is cause for replacement. Maintenance of the valve should include general cleaning, together with replacement of elastomers and worn or damaged components, packing and safety devices, where necessary.
After the valve has been reassembled, it should be checked for correct operation and should undergo internal and external leak checks at intended operating pressure for example, see ISO and ISO This may be done prior to the valve being refitted to the cylinder or during and after the first gas charge subsequent to the inspection and test of the cylinder. This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing.
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Annex B normative Description, evaluation of defects and conditions for rejection of seamless steel gas cylinders at the time of visual inspection. Annex F informative Inspection and maintenance of valves and their junctions—Recommended procedures. Generally, mixtures that are toxic or corrosive have a 5—year interval, and other mixtures have a 10—year interval. NOTE 1 These test periods may be used provided the dryness of the product and that of the filled cylinder are such that there is no free water.
This condition shall be proven and documented within a quality system of the filler. If these condition cannot be fulfilled, alternative or more frequent testing may be appropriate.
NOTE 2 At all times, certain requirements may necessitate a shorter time interval, e. Cylinders not in conformance with the special hydrogen requirements shall be withdrawn from hydrogen service.
See ISO for possible additional testing. See ISO Repair possible b Repair possible b Render unserviceable. Excessive general or localized heating of a cylinder usually indicated by: a partial melting of the cylinder b distortion of cylinder c charring or burning of paint d fire damage to value, melting of plastic guard or date ring or fusible plug if fitted. All cylinders in categories a and b Cylinders in categories c and d may be acceptable after inspection and testing.
Render unserviceable Repair possible. In case of doubt, render unserviceable. All cylinders unless it can be clearly established that addition is part of approved design. Partial melting of the cylinder, the addition of weld metal or the removal of metal by scarfing or cratering. Marks introduced other than by the cylinder manufacturing process and approved repair. Deviation from verticality which may present a risk during service especially if fitted with foot-ring.
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