1、Lessons Learned Entry: 0168Lesson Info:a71 Lesson Number: 0168a71 Lesson Date: 1993-07-01a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Hydrogen Detonation in Propellant Piping Systems Description of Driving Event: A three inch diameter stainless steel manifold containing hydro
2、gen (0.27 lbs) and air (0.26 lbs) at 350 psia ruptured during experimental operation. The hardware was off-the-shelf, slightly modified, pre-safety checked and analyzed by the supply vendor. The test apparatus was in an altitude tank at simulated altitude conditions at the time of the mishap. Damage
3、 was restricted to the manifold and some of the experimental package valves.The cause of the rupture was a detonation of an unplanned hydrogen and air mixture inside the manifold. A contributing factor was the deviation from preplanned test procedure by the test crew while attempting to make the dev
4、ice work.The investigation team determined that the principal cause of the mishap was the lack of backflow prevention devices in the hydrogen and air supplies to the test package. That deficiency permitted the accumulation of the detonation charge within the manifold.Lesson(s) Learned: Small amounts
5、 of hydrogen (0.027 lbs) and air (0.26 lbs) at 350 psia and an ignition source can cause detonation and damage in a confined area.Recommendation(s): Design backflow prevention devices in propellant piping systems to prevent the accumulaion of combustible mixtures in confined areas.Provided by IHSNot
6、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: Recommendations were approved by the LERC executive safety board.Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energetic Materials
7、- Explosive/Propellant/Pyrotechnica71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1994-04-19a71 Approval Name: Evan E. Blancoa71 Approval Organization: LERC/501-4a71 Approval Phone Number: 216-433-8717Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
