4 冲洗方案.ppt

1,API Piping PlansAPI 冲洗方案,November 2004,JC Tianjin TrainingModule 4.3,Seal Environment密封环境,API Piping Plans API 冲洗方案,Integral (internal) recirculationfrom pump discharge to seal内部循环从泵的出口到密封,Advantage 优点 - No external piping 没有外部冲洗 Limitations 局限性 - Changing flow rate required dismantling of pump 改变流量需要拆泵 - For clean pumpages only 只能是适用干净的介质,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,,,,,,Points to Note for API Plan 02: API 02 冲洗方案应注意的事项：The injection tapping is used for venting prior to start–up. -在开车前，冲洗口或泵盖开口用来进行放空API plan 02 is often used together with plan 62, especially on high temperature bellows seals.冲洗方案2经常与62一起用，特别是用在高温波纹管密封,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,No flushing to the mechanical seal (‘dead-ended’)机械密封里没有冲洗,,,,,,,,,,Points to Note for API Plan 11: API 冲洗方案11 应注意的事项- Use an orifice to restrict the flow rate if the discharge pressure is 3 bar higher than seal chamber pressure.如果出口压力高于密封腔压力3bar，需要用一个孔限制流量- Use on clean and low abrasives duties用在干净，含磨石性颗粒少的工矿,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,Seal Flushing By-Pass from Discharge单密封通过出口进行冲洗,API Piping Plans API 冲洗方案,,,Overhung Pump – 1 seals,API Piping Plans API 冲洗方案,,,Overhung Pump – 1 seals,API Piping Plans API 冲洗方案,,,Between Bearings Pump – 2 seals,API Piping Plans API 冲洗方案,,,Between Bearings Pump – 2 seals,Recirculation from seal chamber through a flow control orifice and back to pump suction从密封腔里出通过一个孔板返回到泵的入口,,,,,,,,,,,,,,,Points to Note for API Plan 13:API 冲洗方案 13 应注意的事项- Use an orifice to restrict the flow rate if the seal chamber pressure is 3 bar higher than suction pressure.如果密封腔压力高于入口压力3bar，需要用一个孔限制流量- handle abrasives duty better than API plan 11处理含有磨石性颗粒的工况13方案优于11方案- higher seal chamber pressure to suppress vaporisation较高的密封腔压力可抑制介质的汽化,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,,,,,,,,,+,=,Points to Note for API Plan 14: API 冲洗方案 14 应注意的事项：- Flow back to suction side will evacuate vapours that may collect in seal chamber.- Recommended for light hydrocarbon service.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,Recirculation from pump discharge through a flow control orifice and cooler to sealOpen Loop Cooling Circuit,,,,,,,,,,Cooling Water Outlet冷水出口,Cooling Water Inlet冷水入口,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,API Piping Plans API 冲洗方案,,,API Piping Plans API 冲洗方案,,,API Piping Plans API 冲洗方案,,,Heat Exchanger,Recirculation from a pumping ring in the seal chamber through cooler and back to seal Closed Loop Cooling Circuit 冲洗液通过密封腔中的泵效环从密封腔中流出经过换热器，再返回到密封中，形成自封闭循环。

形成封闭的冷却回路,Throat bushing,Suction入口,Discharge出口,,,,,,18 - 24",,,Vent at highest point of the piping排起在管线的最高点,,,,Cooling Water Outlet冷水出口,Cooling Water Inlet冷水入口,,,,,mechanical seal with pumping ring,Heat exchanger换热器,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,,Points to note for API Plan 23:Thermosyphon design热虹吸设计 * heat exchanger 换热器 18 to 24“ above pump centre line. 在泵中心线以上 18 to 24" * Prevent overheating in standby and start–up. * 在泵启动和备用时，要防止过热Install close fitting neck bushing at the bottom of seal chamber to isolate the heat from the impeller end.在密封腔底部安装喉部衬套用来隔离从叶轮传出的热量Used on high temperature applications to minimise heat load on the cooler by cooling only small amount of liquid that is recirculated.用于高温工况，通过冷却密封腔的小部分的循环流体来使冷却器的热负荷降至最低.For high temperature boiler feed pump applications用于高温锅炉给水泵上Other applications其他应用 * high temperature liquid close to bubble point. * 接近沸点的高温液体.,,,API Piping Plans API 冲洗方案,Recirculation from pump discharge through a cyclone separator delivering clean fluid to the seal and fluid with solids back to pump suction line冲洗液从泵出口流出，通过一旋液分离器，使干净流体进入密封腔，带有颗粒的流体返回到泵入口处形成封闭循环,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,,,Points to Note for API Plan 32:对于API plan 32 须注意:- Chose a proper source of seal flush to eliminate the potential for vaporisation of the injected fluid and to avoid contamination of the fluid being pumped with the injected flush.选择合适的密封冲洗源， 以减少冲洗流体的汽化，同时可避免冲洗流体被污染。

Install a labyrinth bushing at the bottom of the stuffing box to control the flushing and pressure if necessary.- - 如有必要的话，在密封腔底部安装喉部衬套或迷宫密封来控制冲洗和压力API Piping Plans API 冲洗方案,Single Seal Flushing from External Source单密封通过外部来源进行冲洗,,Throat Bushing,API Piping Plans API 冲洗方案,,,Clean external flush,API Piping Plans API 冲洗方案,,,Clean external flush,Recirculation from pump discharge through a cyclone separator delivering clean fluid through a cooler and then to seal and fluid with solids back to pump suction line,,,,,,,,,,,,,,,,,,,,,,,,,,,Cooling Water Outlet,Cooling Water Inlet,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,API Piping Plans API 冲洗方案,,Needle valve,,,External reservoir providing a dead-ended blanket of fluid to the quench connection of the gland.,Points to Note for API Plan 51:对于API plan 51 须注意: -- Dead ended blanket on atmospheric side of seal to prevent freezing of moisture. Seal face will not stick together when the pump started. - 在密封大气侧，一端封闭的情况可防止潮气的冻结，这样在泵启动时，密封面就不会粘接在一起。

Typical application : 典型的应用Pump operating below 0° C应用于泵在 0°C以下-- API 610 8th Edition has eliminated this piping plan.API 610 第八版已经取消这个冲洗方案--,。