ICS 23.020.30                          MED 16

Reaffirmed 2022

1. Scope

This standard specifies the requirements for the design, manufacture, inspection and testing of a transportable refillable seamless steel cylinder cascade. It is applicable to cascades containing permanent compressed gases and mixtures there of excluding toxic gases and acetylene.

This standard does not apply to cascades in which cylinders are manifolded together in a support frame which is designed to be an integral part of a railway wagon or fixed to the ground as a customer storage vessel , for use in extreme environmental or operational conditions when additional and extraordinary requirements are imposed to maintain safety standards, reliability and performance (for example off shore cascades are a specific example) and cascade for gases dissolved in liquid under pressure.

Some special applications (for example electronics) require an alternative design approach. With the agreement of the inspection body, the manifold and its piping components may be designed and tested at a pressure which is appropriate to the service conditions.

Unless otherwise stated, individual cylinders within cascade shall have to conform to applicable standards for single cylinders. This standard specifies the additional requirements that apply when individual cylinders are assembled into a cascade. Cascades complying with this standard may be used for stationery application.