方案二十三

　　What

　　Leakage detection atmospheric side of seal utilizing a

　　throttle bushing and orifice plug

　　Why

　　Safety indicator for primary seal detects failure

　　Where

　　May be used alone or with Plan 65A or Plan 65B

　　Used with close clearance throttle bushing

　　Used with flashing or non-flashing fluids

　　Useful when adding atmospheric side leakage detection to an

　　existing seal

　　Useful with single seals in remote locations and critical

　　services .

　　Preventative Maintenance

　　Drain must be on bottom of gland with downward sloped

　　piping

　　Continuously drain to a liquid recovery system .

　　Monitor for high pressure .

　　Check orifice regularly for build up and plugging