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Mechanical Seal Piping Plans Single Seals plans 01, 02, 03, 11, 13, 14, 21, 23, 31, 32, 41 Dual Seals plans 52, 53A, 53B, 53C, 54, 55 Quench Seals plans 62, 65A, 65B, 66A, 66B Gas Seals plans 72, 74, 75, 76 Mechanical Seal Piping Plans Flowserve recognizes that one of the most effective ways to achieve long, uninterrupted mechanical seal life is to create a healthy environment around the seal faces. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational availability of rotating equipment. This reference book provides a concise summary of the most essential piping plans used successfully in today’s process plants. Each plan shows all the standard and optional auxiliary components referenced in ISO 21049 / API Standard 682 and recommended by Flowserve. Consult your local Flowserve sales engineer to identify the right solution that satisfies your application requirements. Page Layout Seal End View Piping Plan Layout What, Why, and Where • Viewed from drive end • Shows preferred gland connection orientation • Illustrated schematic of auxiliary components • Describes piping plans, their purpose, and typical applications flowserve.com Plan 53A inlet liquid fill, normally closed level switch (high) level indicator level switch (low) reservoir cooling coils cooling out cooling in drain, normally closed Why Isolate process fluid. Zero process emissions. Where Used with dual pressurized seals (”double”). High vapor pressure fluids, light hydrocarbons. Hazardous/toxic fluids. Heat transfer fluids. Dirty/abrasive or polymerizing fluids. Mixers/agitators and vacuum service. Plan 53A pressure source, normally open pressure indicator (low) pressure switch (high) outlet seal end view What Pressurized barrier fluid circulation through reservoir. Fluid is circulated by a pumping ring in the dual seal assembly. Preventative Maintenance - Reference Appendix B Piping loop must self-vent to reservoir locate at highest elevation. Pressurize reservoir at all times, maximum gas charge 150 - 200 psi (10 - 14 bar). Barrier fluid must be compatible with process. Reservoir level gage indicates both inboard and outboard seal leakage. Pump Cross-section Mechanical Seal Preventative Maintenance • Simplified centrifugal pump shown for all plans • Shows typical seal arrangements • Provides general tips to improve reliability and for troubleshooting Plan 01 seal end view internal porting flowserve.com Why Seal chamber heat removal. Seal chamber venting on horizontal pumps. Reduce risk of freezing/polymerizing fluid in exposed Plan 11 piping. Where Custom seal chamber, most likely an ANSI/ASME pump. Clean, moderate temperature fluids. Used with single seals, rarely with dual seals. Preventative Maintenance Flush typically can not be directed over seal faces and seal heat removal is limited. Calculate flush flow rate based on head loss through internal porting. Plan 01 What Internal seal chamber flush from pump discharge. Operates similar to Plan 11. Plan 02 seal end view flowserve.com What Dead-ended seal chamber with no flush. Where Cooling jacket seal chambers in high temperature services. Clean fluids. Top-entry mixers/agitators with dry seals. Heating jacket seal chambers in fluids that solidify at low temperatures. Preventative Maintenance Process must have adequate boiling point margin to avoid vaporization. Cooling fluid in seal chamber jacket may be needed at all times in hot services. Horizontal equipment must be self-venting. Often used in combination with steam quench, Plan 62. Plan 02 Why No fluid recirculation needed. Plan 03 seal end view tapered bore seal chamber shown flowserve.com What Circulation created by the design of the seal chamber. Where Large bore/open throat seal chambers. Dirty or contaminated fluids. Preventative Maintenance Proper seal chamber design helps prevent solids from collecting at the seal faces. Plan 03 Why No external fluid recirculation needed. Solids removal from seal chamber. inlet Plan 11 seal end view orifice