ISO/AWI 19880-11

Gaseous hydrogen — Fuelling stations — Part 11: Part 11: High pressure Liquid Hydrogen Pumps

Scope

This document describes the technical requirements and testing methods for liquid hydrogen pumps used in hydrogen refueling station to meet high pressure onboard storage requirements which is typically with pressure of H35 or H70.
The document is applicable to cryogenic reciprocating pump, including internal type and external type. The pump components include cold-end cylinder assembly, warm-end drive, and cold- and warm- end connection.
The cold-end cylinder assembly consisting of key components such as the piston, piston rings, cylinder, and suction and discharge valves; through which the LH2 passes and is elevated in pressure. The warm-end drive is usually rated for the pressure and flow rate expected for the cold end, is used to drive the cold end and control the piston's forwards and backwards movements via a drive mechanism. The cold- and warm-end connection ensures both correct alignment and transmission of forces, and also ensures that any leakage of cryogenic liquid is kept away from the warm end.
It is not applicable to liquid transfer pumps for fuelling liquid hydrogen vehicles.