机械密封种类
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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
Throat Bushing
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， 以消除冲洗流体的汽化 ，同时要避免泵送介质被冲洗流 体污染。
API Piping Plans API 冲洗方案
Cooling Water Inlet冷水 入口
ቤተ መጻሕፍቲ ባይዱ
Cooling Water Outlet冷 水出口
Recirculation from pump discharge through a flow control orifice and cooler to seal
Seal Environment 密封环境
API Piping Plans API 冲洗方案
JC Tianjin Training
Module 4.3
1
November 2004
API Piping Plans API 冲洗方案
API Piping Plans API 冲洗方案
Advantage 优点
Pressure of the barrier fluid is always higher than the pump process pressure being sealed. 隔离液压力总是高于泵的运作压力
The purpose of fluid circulation is to remove heat from mechanical seal
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. 可以将密封腔中聚集的气 体回送到泵进口
-Recommended for light hydrocarbon service. 推荐使用在轻烃工况
- 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
Single Seal Flushing from External Source 装迷宫密封来控制冲洗和压力。 单密封通过外部来源进行冲洗
缓冲液的压力通常低于被密封的介质的压力 A fluid which is introduced between dual mechanical
seals to completely isolate the pump process liquid from the environment. 双机械密封里的隔离液使泵送的工艺液体与大气完全分离
* 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端传出的热量 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
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
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 处理含有磨粒的工况13方案好于11方案 - higher seal chamber pressure to suppress vaporisation较高的密封腔压力可抑制它的汽化
API Piping Plans API 冲洗方案
Cooling Water Inlet
Cooling Water Outlet
Recirculation from pump discharge through a cyclone separator delivering clean fluid through a cooler and then to
Heat exchanger 换热器
Suction 入口
18 - 24"
mechanical seal Throat bushing with pumping ring
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
Open Loop Cooling Circuit 开环冷却
API Piping Plans API 冲洗方案
Discharge出 口
Vent at
highest
point of
the piping排 起在管线 的最高点
Cooling Water Inlet冷 水入口
Cooling Water Outlet冷 水出口
API Piping Plans API 冲洗方案
API Piping Plans API 冲洗方案
A fluid used as a lubricant or buffer between dual mechanical seals. 这种液体作为缓冲剂或润滑剂用在两套机械密封之间
The buffer fluid is always at a pressure lower than the pump process pressure being sealed.
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
Clean overflow
Inlet Underflow
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
循环。闭环冷却回路
API Piping Plans API 冲洗方案
Points to note for API Plan 23: API 23方案的注意点
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"
- 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 只- 能Fo是r c适le用an干p净um的p介ag质es only
Integral (internal) recirculation from pump discharge to seal
seal and fluid with solids back to pump suction line
API Piping Plans API 冲洗方案
Needle valve
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. 在密封的大气侧，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
No flushing to the mechanical seal (‘dead-ended’) 机械密封里没有冲洗
API Piping Plans API 冲洗方案
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.如出口压力高于密封腔压 力3bar，需要用一个孔板限制流量 - Use on clean and low abrasives duties用在干净，含磨蚀性颗粒少 的工况
内部循环从泵的出口到密封
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 ，注入口用来进行放空 - API plan 02 is often used together with plan 62, especially on high temperature bellows seals.冲洗方案 02经常与62一起用，特别是用在高温 波纹管密封
Pump operating below 0° C 应用于泵在 0°C以下操作
-- API 610 8th Edition has eliminated this piping plan.API 610 第八版已经取消 这个冲洗方案
Extern--al reservoir providing a dead-ended blanket of fluid to the quench connection of the gland.
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
API Piping Plans API 冲洗方案
+=
Points to Note for API
API Piping Plans API 冲洗方案
Throat Bushing
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， 以消除冲洗流体的汽化 ，同时要避免泵送介质被冲洗流 体污染。
API Piping Plans API 冲洗方案
Cooling Water Inlet冷水 入口
ቤተ መጻሕፍቲ ባይዱ
Cooling Water Outlet冷 水出口
Recirculation from pump discharge through a flow control orifice and cooler to seal
Seal Environment 密封环境
API Piping Plans API 冲洗方案
JC Tianjin Training
Module 4.3
1
November 2004
API Piping Plans API 冲洗方案
API Piping Plans API 冲洗方案
Advantage 优点
Pressure of the barrier fluid is always higher than the pump process pressure being sealed. 隔离液压力总是高于泵的运作压力
The purpose of fluid circulation is to remove heat from mechanical seal
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. 可以将密封腔中聚集的气 体回送到泵进口
-Recommended for light hydrocarbon service. 推荐使用在轻烃工况
- 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
Single Seal Flushing from External Source 装迷宫密封来控制冲洗和压力。 单密封通过外部来源进行冲洗
缓冲液的压力通常低于被密封的介质的压力 A fluid which is introduced between dual mechanical
seals to completely isolate the pump process liquid from the environment. 双机械密封里的隔离液使泵送的工艺液体与大气完全分离
* 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端传出的热量 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
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
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 处理含有磨粒的工况13方案好于11方案 - higher seal chamber pressure to suppress vaporisation较高的密封腔压力可抑制它的汽化
API Piping Plans API 冲洗方案
Cooling Water Inlet
Cooling Water Outlet
Recirculation from pump discharge through a cyclone separator delivering clean fluid through a cooler and then to
Heat exchanger 换热器
Suction 入口
18 - 24"
mechanical seal Throat bushing with pumping ring
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
Open Loop Cooling Circuit 开环冷却
API Piping Plans API 冲洗方案
Discharge出 口
Vent at
highest
point of
the piping排 起在管线 的最高点
Cooling Water Inlet冷 水入口
Cooling Water Outlet冷 水出口
API Piping Plans API 冲洗方案
API Piping Plans API 冲洗方案
A fluid used as a lubricant or buffer between dual mechanical seals. 这种液体作为缓冲剂或润滑剂用在两套机械密封之间
The buffer fluid is always at a pressure lower than the pump process pressure being sealed.
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
Clean overflow
Inlet Underflow
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
循环。闭环冷却回路
API Piping Plans API 冲洗方案
Points to note for API Plan 23: API 23方案的注意点
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"
- 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 只- 能Fo是r c适le用an干p净um的p介ag质es only
Integral (internal) recirculation from pump discharge to seal
seal and fluid with solids back to pump suction line
API Piping Plans API 冲洗方案
Needle valve
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. 在密封的大气侧，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
No flushing to the mechanical seal (‘dead-ended’) 机械密封里没有冲洗
API Piping Plans API 冲洗方案
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.如出口压力高于密封腔压 力3bar，需要用一个孔板限制流量 - Use on clean and low abrasives duties用在干净，含磨蚀性颗粒少 的工况
内部循环从泵的出口到密封
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 ，注入口用来进行放空 - API plan 02 is often used together with plan 62, especially on high temperature bellows seals.冲洗方案 02经常与62一起用，特别是用在高温 波纹管密封
Pump operating below 0° C 应用于泵在 0°C以下操作
-- API 610 8th Edition has eliminated this piping plan.API 610 第八版已经取消 这个冲洗方案
Extern--al reservoir providing a dead-ended blanket of fluid to the quench connection of the gland.
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
API Piping Plans API 冲洗方案
+=
Points to Note for API