Subject

Back Pressure Regulator

Description

The T-0 vent support assemblies are mounted on the orbiter T-0 Interface to support controlled venting of PRSD tanks after landing. In the event of regulator diaphragm failure, GH2 or GO2 can vent to atmosphere near the orbiter through the back pressure regulators. Leaking GH2 could cause a fire or explosion. Leaking GO2 could contribute to failure of the diaphragm in the back pressure regulator of the FCSS, PRSD T-0 safing system could release GH2 in the vicinity of the orbiter.



Lesson(s) Learned

Failure of the diaphragm in the back pressure regulator of the FCSS, PRSD T-0 safing system could release GH2 in the vicinity of the orbiter.

Recommendation(s)

Install an isolation valve upstream of the back pressure regulator, thereby allowing manual vent line pressure regulation.



Mission Directorate(s)

  • Exploration Systems
  • Space Operations

Additional Key Phrase(s)

  • Hardware
  • Ground Equipment
  • Ground Operations
  • Flight Equipment
  • Facilities
  • Energetic Materials - Explosive/Propellant/Pyrotechnic
  • Hazardous/Toxic Waste/Materials
  • Pressure Vessels
  • Parts Materials & Processes
  • Launch Vehicle

Approval Info

  • Approval Date: 1994-06-01
  • Approval Name: James G. Kline
  • Approval Organization: KSC/HEI
  • Approval Phone Number: