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Steam seperators:Steam seperators are devices installed in the boiler steam space designed to seperate out moisture and impurities from the steam as it exits the boiler.(Steam and Hot Water Primer,Chris Langley,Andrew Sacks,p:79)
Boiler feed pump system:Many boiler feed pump system configurations have been used in power station applications.The basic system usually includes a deaerating and storage tank at some elevation above the suction of the boiler feed pump to provide a reservoir of heated deaerated condensate to the boiler feed pump and available suction head for the pump.The suction pipeline to the boiler feed pump is amply sized to maintain the required suction velocity into the boiler feed pump as well as limit the friction drop between a deaerator and the boiler feed pump.(Power Plant Engineering,Lawrence F. Drbal,Patricia G. Boston,Kayla L. Westra,p:341)
Pilot operated valves:The nozzle sealed by a piston which is loaded by the process pressure. The differantial area between the nozzle bore and the back of the piston creates an unbalanced force which holds the piston down on the nozzle.As the process pressure increases unbalanced force increases which increases the sealing pressure on nozzle face.Pilot operated valves can operate extremely close to the set pressure similar to pilot assisted and supplementary loaded valves without tending to leak.Most pilot operated valves have resillient seats to further reduce seat leakage.When the pilot valve senses the set pressure normally in the nozzle the pilot vents the process fluid above the piston and the fluid forces from the nozzle bore open the valve.(Guide to European valves:for control,isolation and safety,Brian Nesbitt,p:76)
Capture pumps:Capture pumps operate on the principle of having the molecules of the gas retained in the pump itself by sorption or condensation on internal surfaces.Examples are diffusion pump,sorption pump,sublimation pump,sputterion pump,and the cryopump.Capture pumps are typically low volume ultrahigh vacuum producing pressure pumps.They find application mostly in semiconductor and unique research facilities.(Facility Piping Systems Handbook:For industrial,Commercial and Healthcare,Michael Frankel,p:15-13)