This International Standard specifies the minimum requirements for the design, manufacture and testing of centrifugal pumps for cryogenic service. This International Standard does not apply to reciprocating pumps. This International Standard also gives guidance on the design of installations (see Annex A). It does not specify requirements for operation or maintenance. NOTE For general requirements for materials used in cryogenic fluid service, see ISO 21029-1, ISO 20421-1 and/or ISO 21009-1.