Piping stress analysis at the limits of engineering

The challenge

Cryogenic piping systems fail differently from conventional process piping. The thermal contraction between ambient installation conditions and operating temperatures of -160°C to -196°C generates pipe movements and anchor loads that dwarf anything seen in standard hydrocarbon service.

The materials — austenitic stainless steels, aluminium alloys, 9% nickel steel — behave in ways that conventional pipe stress approaches do not capture. And brittle fracture, the failure mode that is catastrophic and instantaneous, waits at the intersection of low temperature, stress concentration, and incorrect material selection.

Our approach

Emveedo's cryogenic piping stress analysis is grounded in live project delivery — not adapted from ambient temperature methodology. Our experience includes liquid air energy storage systems operating at -196°C, incorporating cryogenic transfer pumps, cold box systems, cryogenic expanders, and liquid air storage vessels.

Analysis is performed to ASME B31.3 with specific application of the low-temperature toughness requirements and the special design provisions for cryogenic service. Caesar II modelling incorporates the full thermal load case matrix — cooldown, normal operation, warm-up, and emergency conditions. Where vacuum-jacketed piping is present, the interaction between inner and outer pipe is explicitly modelled.

Material selection input is provided as part of every cryogenic scope — the stress analysis and the material specification cannot be developed independently when brittle fracture is the governing failure mode.

What makes this different

Cryogenic pipe support design

Pipe support design for cryogenic systems is not an extension of conventional support engineering. It is a distinct discipline governed by three competing requirements that conventional supports cannot satisfy simultaneously: structural restraint, thermal isolation, and vapour barrier integrity.

At operating temperatures of -160°C to -196°C, a steel support in direct contact with cryogenic piping becomes a heat leak — conducting ambient energy into the cold system, accelerating boil-off, and generating condensation or ice formation that compromises both the support structure and the insulation system.

Our cryogenic support design addresses this through an integrated approach covering cold shoe design, thermal isolation, vapour barrier continuity, and spring support selection for cryogenic service.

What you get

A fully documented cryogenic piping stress analysis package: Caesar II model files incorporating cryogenic thermal load cases, support reaction report, cold spring calculation where required, nozzle load compliance check, cryogenic pipe support design package including cold shoe calculations and insulation block sizing, material selection confirmation against minimum design temperature, and an independent technical narrative.

For LAES, LNG, and liquid hydrogen facilities, deliverables are structured for FEED gate review, detailed design acceptance, and regulatory submission under UKCA pressure equipment regulations.