Boiler Feed Water Pump Mechanical Seal

Role of boiler feed pump in boiler feed system working principle of a boiler feed pump.

Boiler feed water pump mechanical seal.

To ensure adequate feedwater flow a boiler must have at all times a slightly higher capacity for feedwater than for steam generation capacity of boiler. And at the heart of any power station s pre boiler system is the boiler feed pump. Most of these pumps are between bearings multistage centrifugal designs with mechanical seals installed at each end of the pump. This pump is fitted with mechanical seal or labyrinth glands to prevent leakage along the shaft and a balance piston to achieve hydraulic balance and.

With the rotation of shaft and impeller the hot feed water is thrown outwards radially across the walls of the pump. Mechanical seal series 800hb2 cg. These pumps are normally high pressure units that take suction from a condensate return system and can be of the centrifugal pump type or positive displacement type. The work of a boiler feed pump is to discharge the condensate boiler feed water from hotwell to the boiler drum.

Along the path of the flow. 6 volute casing pump. A boiler feedwater pump is a specific type of pump used to pump feedwater into a steam boiler the water may be freshly supplied or returning condensate produced as a result of the condensation of the steam produced by the boiler. Transient or low flow operating conditions cause additional loads on boiler feed pumps.

Boiler feed water applications are one of the most difficult process fluids that centrifugal pumps can encounter. Along with this the procedure for dismantling and assembling of the boiler feed water pump and seal. Rotating mating ring design makes it suitable for high speed application avoids critical requirments of stuffing box face squareness. Warming up and keeping warm.

Boiler feedwater pumps are used to increase the discharge pressure of the feedwater to the boiler. As the mechanical seals are normally used in the boiler feed water pump because it develops a high pressure as it has to feed the water to the boiler. The sealing conditions for boiler feedwater pumps range from 20 to 200 barg 290 to 2 900 psig up to 175 c 347 f and shaft speeds between 3 600 and 5 500 rpm. Specifying the correct features and options on api 610 centrifugal pumps going into boiler feed systems is the first step in optimal reliability.

Also see shaft seal. Gland packings are less common these days. Common shaft seals for boiler feed pumps are mechanical seals floating ring seals and labyrinth seals. The leak pack designed lps 258 is a unique seal developed to meet stringent technical requirements of boiler feed water pumps rotating stationary ring design makes it suitable for high speed application avoids critical requirement of stuffing box face squareness.

For safe and reliable mechanical seal operation the water temperature must be below 65 c 150 f where the viscosity is above 0 43 cp. This is a unique seal developed to meet stringent technical requirements of boiler feed water pumps.