Boiler feedwater pump
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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. 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.
Construction and operation
Feedwater pumps range in size up to many horsepower and the electric motor is usually separated from the pump body by some form of mechanical coupling. Large industrial condensate pumps may also serve as the feedwater pump. In either case, to force the water into the boiler, the pump must generate sufficient pressure to overcome the steam pressure developed by the boiler. This is usually accomplished through the use of a centrifugal pump. Another common form of feedwater pumps run constantly and are provided with a minimum flow device to stop overpressuring the pump on low flows. The minimum flow usually returns to the tank or deaerator.
Failure of mechanical seal
Since the corrosion inhibitor hydrazine has been forbidden as of the health risks connected to it, mechanical seals of boiler feedwater pumps show signs of electrical corrosion unknown before. The relative movement between the sliding ring and the stationary ring provokes static charging which – in contrast to the past – are no longer diverted as of the very low conductivity of the boiler water below one micro-Siemens per cm [μS/cm]. Within short periods of operation – in some cases only a few hundred operational hours – pieces having the size of finger tips break off from the sliding and/or the stationary ring and cause rapid increases in leakage current. Diamond-coated (DLC) mechanical seals avoid this problem and extend durability remarkably.
Steam locomotives and the steam engines used on ships and stationary applications such as power plants also require feedwater pumps. In this situation, though, the pump was often powered using a small steam engine that ran using the steam produced by the boiler. A means had to be provided, of course, to put the initial charge of water into the boiler (before steam power was available to operate the steam-powered feedwater pump). The pump was often a positive displacement pump that had steam valves and cylinders at one end and feedwater cylinders at the other end; no crankshaft was required.
Duplex steam pump
A duplex steam pump has two sets of steam and water cylinders. They are not physically connected but the steam valves on the first pump are operated by the movement of the second pump's piston rod, and vice versa. The result is that there are no "dead spots" and the pump is always self-starting.
- Diamond-coated (DLC) seals in 27.000h endurance test, Technical University of Graz
- "Duplex Pump (from Internet Glossary of Pumps)". Animatedsoftware.com. Retrieved 2012-04-22.
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