BS ISO 20475:2018 pdf free.Gas cylinders – Cylinder bundles – Periodic inspection and testing.
Depending upon the nature of the operation, an existing bundle may. upon dismantling, be reassembled using the same frame, cylinders and components. Alternatively, frames, cylinders and components may be interchanged for ease of operation during the periodic inspection and testing, provided these parts are in compliance with the type approval of the bundle.
If a replacement of any part o[the bundle takes place at any stage during the periodic inspection and testing. the new parts shall be compatible with the original design type specification and the tare of the bundle shall be adjusted if necessary.
5.2 Identification of cylinders/bundles and preparation for inspections and tests Upon receipt of the bundle for inspection, the gas content within the bundle shall be identified.
Before any work is carried out, the relevant cylinder data and ownership shall be identified and the bundle type approval made available to the inspection body, if necessary.
5.3 Depressurization of manifold and individual cylinders
WARNING — Safety measures shall be taken to protect personnel carrying out the periodic inspection and testing of bundles due to the considerable damage that could be caused from the stored energy if released. The uncontrolled removal of valves from the elements of the bundle can lead to injury, death or property damage. Additional precautions shall be taken when the bundle has been used in flammable gas service.
Cylinders and any pressure-retaining devices, e.g. valves, fittings, hoses, pigtails or piping, shall be depressurized to atmospheric pressure and emptied in a safe, controlled manner before carrying out any inspection or test work on the individual cylinders.
Particular attention shall be given to cylinders containing flammable, oxidizing, corrosive or toxic gases to eliminate risks at the internal inspection stage, e.g. by purging the cylinders and associated fittings prior to devalving and removal from the bundle.
A positive check shall be performed prior to the removal of pressure-retaining devices to ensure these devices are isolated from all pressure sources. This check shall be performed as described in ISO 25760. Residual pressure valves and non-return valves shall be safely overridden to ensure that the cylinders are fully depressurized in accordance with the requirements of ISO 15996.
Main or cylinder valves that are found to be inoperative or blocked shall be depressurized in accordance with the requirements of ISO 25760. In the case of cylinders disassembled from bundles and not equipped with cylinder valves, the cylinder fittings shall be checked to determine whether the gas is able to pass freely from the cylinders, e.g. using the device shown in ISO 25760.
WARNING — Failing to follow ISO 25760 requirements can cause loss of life, injury and/or property damage.
Provided the requirements described in this clause have been met, the manifold and cylinders may be depressurized safely and the corresponding valves may be removed.BS ISO 20475 pdf download.
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