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The Proton Improvement Plan-II (PIP-II) is a superconducting linearaccelerator being built at Fermilab that will provide 800 MeV proton beam forneutrino production. The linac consists of a total of twenty-three (23)cryomodules of five (5) different types. Cooling is required at 2K, 5K and 40K.The Cryogenic Distribution System (CDS) consists of a Distribution Valve Box,~285 m of cryogenic transfer line, modular Bayonet Cans to interface withcryomodules, and a Turnaround Can. The cryogenic system must provide protectionfrom over-pressure by sizing pressure relief devices for all volumes andprocess line circuits. The cryomodule cavity circuits have dual pressureratings, 4.1 bara when cold and 2.05 bara when warm (T>80K). Worst caserelieving cases will be identified. The methods for determining heat flux willbe presented. For the relieving occurring in the linac tunnel, flow must ventto outside to avoid an oxygen deficiency hazard. Also, we will present vacuumvessel relief sizing to protect the cryogenic distribution system vacuum shellsfrom over pressure during an internal line rupture. The project is funded by USDOE Offices of Science, High Energy Physics.

Pressure safety approach for PIP-II cryogenic distribution system and cryomodules