AerospaceCryogenicsCurrent Projects

Cryogenics for SLS Mobile Launcher

By October 1, 2016 No Comments

YEAR

2016-2017

LOCATION

Space Coast, FL

ABOUT

JP Donovan Construction self-performs fabrication and installation of cryogenic systems.  Projects have included the installation of liquid Oxygen and liquid Hydrogen subsystems to supply liquid fuel and oxidizers from  launch pad interfaces to launch vehicles.

Field installations are completed by JP Donovan including the installation of structural support mounts, pipe support frames, pipe spools, and skids.

Fabrication and machining of structural supports, pipe support frames, and other structural assemblies are completed at our AISC certified fabrication shop.

Due to the delicate nature of cryogenic systems, all pipe spools are maintained and kept clean throughout the process of installation. All lines are purged with dry GN2 to prevent moisture or other contaminants from entering the inner pipe and the annular space. Vacuum levels of pipe spools are also maintained with vacuum pumps and equipment that are equipped with safety check valves to mitigate oil contamination in the systems.

All welding of cryogenic piping and components is performed in a controlled environment with a dedicated clean work area. Welded cryogenic piping and components are examined by radiograph, dye-penetrant, and/or visual inspection per severe cyclic conditions of ASME B31.3.

Post installation, testing for integrity is of the utmost importance. Testing includes pressure testing, vacuum leak and decay testing, cold shocking of the system, and pneumatic and mass spectrometer testing. Structural components and lines are tested with liquid Nitrogen to establish the integrity of the system at cryogenic temperatures.

After cleaning and testing, each pipe assembly is drained, dried, and purged. Weld logs, monitoring records, and test records are diligently maintained to document system fabrication, installation, and final validation at the end of the project.

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