John C.Stennis航天中心（SSC）标准（SSTD）规定了设施管道和管道系统中使用的波登管式压力计和真空计的要求。注:本标准适用于所有新型波登管式压力表和真空表，以及此类现有压力表的必要更换。本SSTD不需要仅为了满足本SSTD的要求而更换状态良好的不合格量规

This John C. Stennis Space Center (SSC) standard (SSTD) establishes the requirements for bourdon tube type pressure and vacuum gauges that are to be used in facility piping and tubing systems. NOTE: This standard applies to all new bourdon tube type pressure and vacuum gauges and to the necessary replacement of such existing gauges. This SSTD does not necessitate replacement of non-conforming gauges considered in good condition just to meet this SSTD's requirements