Qualification Test for the Reliability of Diver Gas Recovery System

A qualification test for the reliability of a newly-developed Diver Gas Recovery System(DGRS)was carried out in the Naval Medical Research Institute of the People's Liberation Army,Chinafrom March 29 to April 2,1995.A sequential test plan of high discrimination ratio for the mean time be-tween failures(MTBF)was adopted.The test procedures simulated those of a 300 msw dive.A hyperbaricbreathing machine was used for the simulation of diver's respiratory functions.Parameters,such as divingdepth,respiratory minute volume(RMV),CO_2 production,gas flow rate,partial pressure of carbondioxide,and ambient temperature and himidity were all displayed and recorded with a microcomputer sys-tem.The results indicated that no failure occurred during the 91.5 h operation.According to the accept-ance and rejection criteria specified in the statistical test plan,a no-failure score in the 88 h operation is ac-ceptable.Therefore,the DGRS has been demonstrated to meet the requirements of MTBF specified in thecontract.

Qualification Test for the Reliability of Diver Gas Recovery System

A qualification test for the reliability of a newly- developed Diver Gas Recovery System (DGRS) was carried out in the Naval Medical Research Institute of the People's Liberation Army, China from March 29 to April 2, 1995. A sequential test plan of high discrimination ratio for the mean time between failures (MTBF) was adopted. The test procedures simulated those of a 300 msw dive. A hyperbaric breathing machine was used for the simulation of diver's respiratory functions. Parameters, such as diving depth, respiratory minute volume (RMV), CO2 production, gas flow rate, partial pressure of carbon dioxide, and ambient temperature and himidity were all displayed and recorded with a microcomputer system. The results indicated that no failure occurred during the 91.5 h operation. According to the acceptance and rejection criteria specified in the statistical test plan, a no-failure score in the 88 h operation is acceptable. Therefore, the DGRS has been demonstrated to meet the requirements of MTBF specified in the contract.