SATPC0041583 Tab 10 Vendor Question and Customer Response.pdf
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- Solicitation number
- 80NSSC26936913Q
About this file
This is a Vendor Question and Customer Response document for NASA contract 80NSSC26936913Q addressing the fabrication of a liquid hydrogen vacuum-jacketed supply section for Cell 7. The document contains four clarification questions from Vendor 1 and corresponding customer responses that establish acceptable design modifications and specifications.
Key clarifications include: (1) JIC fittings and VCR connections are acceptable alternatives to the specified AN swivel fittings; (2) the existing piping comprises two separate sections, and both pumpout/relief ports should be retained in the design; (3) a ½" branch may supplement or replace the 1" x ½" reducing tee specification at the 4-foot point from the bottom of the piping; and (4) globe valves must be fail-closed rather than fail-open. These responses provide vendors with design flexibility while maintaining the functional requirements for the vacuum-jacketed liquid hydrogen supply system.
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Text version
Vendor Question and Customer Response - 80NSSC26936913Q Fabrication of Liquid Hydrogen Vacuum Jacketed Supply Section for Cell 7
Vendor 1 Questions:
• AN swivel fittings are listed on the diagram legend. Are JIC fittings acceptable?
Customer Response: JIC are acceptable, We would also accept VCR connections
• There are two pumpout/relief ports on the piping diagram, but no clear fittings or vacuum breaks separating them. Are these supposed to be two pumpouts on the same vacuum annulus, or is the piping to be made of two separate vacuum-jacketed units?
Customer Response: The existing piping was comprised of two sections, though we would like to keep both pump out ports.
• 4’ from the bottom of the piping, Item 5 mentions a Y-branch, but a 1” x ½” reducing tee (item 8) is also called out. Can either of these options be used for this branch?
Customer Response: If you would like to replace this section with a ½” branch to supplement the reducer that is acceptable
• Are the globe valves fail-closed, or fail-open?
Customer Response: Fail-close
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