Boiler Feed Water Pump Mechanical Seal

Specifying the correct features and options on api 610 centrifugal pumps going into boiler feed systems is the first step in optimal reliability.

Boiler feed water pump mechanical seal.

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. 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. 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. Most of these pumps are between bearings multistage centrifugal designs with mechanical seals installed at each end of the pump.

And at the heart of any power station s pre boiler system is the boiler feed 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. 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. 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.

Also see shaft 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. Commissioning of a boiler feed water pump. In this article you can get a clear picture on the boiler feed water pump that is multistage centrifugal pumps and type of seal used in it.

6 volute casing pump. Transient or low flow operating conditions cause additional loads on boiler feed pumps. With the rotation of shaft and impeller the hot feed water is thrown outwards radially across the walls of the pump. Role of boiler feed pump in boiler feed system working principle of a boiler feed pump.

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

There are a number of primary areas to focus on when considering boiler feed water pumps in order to achieve a state of optimal. Warming up and keeping warm. Gland packings are less common these days. Mechanical seal series 800hb2 cg.

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.