机械密封种类课件.ppt

Seal Environment密封环境 API Piping Plans API 冲洗方案 API Piping Plans API 冲洗方案 Plan 53a (A.4.12) Arrangement 3, Contacting Wet (CW) Seals 排列方式3，接触式湿密封 Dual Pressurised (Double) Seals 带压双封 Utilises direct nitrogen blanket for pressure 利用氮气来加压 due to nitrogen entrainment in the barrier liquid，API 682 limits the maximum nitrogen pressure to 10 barg, JC recommendation is maximum nitrogen pressure 21 barg, as long as the barrier fluid temperature is less than 120°C 由于氮气会夹进封液中API 682 限制了氮气的最大压力为10barg, 约翰克兰建议只要隔离液温度小于120度， 最大氮气压力21barg Plan 53b (A.4.12) 53M Arrangement 3, Contacting Wet (CW) Seals 排列方式3，接触式湿密封 Dual Pressurised (Double) Seals 带压双封 Utilizes bladder accumulator for pressure 利用蓄能器来加压 Bladder eliminates nitrogen contact with barrier liquid 橡胶囊把氮气与隔离液分开 Allows for higher pressure applications 允许高压力应用 Plan 53c (A.4.12) Arrangement 3, Contacting Wet (CW) Seals排列方式3，接触式湿密封 Dual Pressurised (Double) Seals 带压双封 Utilizes piston pot for pressure 利用活塞增压 Plan 53c (A.4.12) Allows for higher pressure applications 允许高压力应用 Configuration includes:构造包括 Piston pot 活塞 Pressure indicator压力显示器 Pressure switch 压力开关‘ Heat exchanger换热器 Level switch液位开关 Plan 72 (A.4.16) Arrangement 2, w/ Containment Seal (CS) 排列方式2，辅助二次密封 Dual Un-Pressurised (Tandem) Seals 不带压串联密封 Dry-running secondary containment seal 干运转二次辅助密封 Low pressure nitrogen sweep (purge)低压氮气吹扫 Sweeps primary leakage to collection system 主密封泄漏的东西排放到收集系统里 Dilutes primary leakage to lower emission levels 稀释泄漏的东西 Used in conjunction with Plan 75 or 76 ，与75方案或76方案一起使用 Plan 74 (A.4.17) Arrangement 3, Non-contacting Seals (NC) 排列方式3，非接触式密封 Dual Pressurised (Double) Gas Barrier Seals 带压 Nitrogen gas barrier 氮气隔离 1.75 - 2 bar (25-30 psi) above seal chamber pressure高于密封腔压力1.75-2bar Zero emissions 零泄漏 Essentially a T2800 panel 28