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Feedwater Systems Exam 5
Terms in this set (25)
A makeup control valve is used to _____.
maintain a constant water level in the feed water heater.
The _____ is the water level designated as being the proper water level for safe boiler operation.
normal operating water level (NOWL)
The purpose of a feed water regulator is to _____.
maintain a constant water level in the boiler
Feed water regulators control the feed water pump to maintain the water level _____.
at the NOWL
The sequence of three numbers found on the nameplate mounted on a reciprocating feed water pump refers to the _____.
diameter of the steam piston, diameter of the water piston, and length of the pump stroke
_____ are usually used to create the draft needed to overcome the resistance caused by economizer tubes.
Induced draft fans
An economizer uses the heat energy from the gases of combustion leaving the boiler to heat the _____.
Turbine feed water pumps are _____.
A turbine feed water pump must be equipped with a(n) _____ on the discharge line to protect the pump from excessive pressure.
Water that is too hot in the open feed water heater can cause _____.
the feed water pump to become steam bound
Water temperatures that are too low in an open feed water heater will cause _____.
oxygen pitting in the boiler
The _____ of a centrifugal feed water pump is the rotating element that imparts centrifugal force to the liquid.
Plant efficiency is increased when a(n) _____ uses steam that is bled or extracted from a steam turbine.
closed feed water heater
If only one low-water fuel cutoff is used, it must have a(n) _____.
One way to increase the efficiency of a plant is to _____.
recover as much heat as possible from the fuel
A _____ is a boiler fitting that reduces the turbulence of boiler water to make it easier to measure the water level.
The piping that connects a water column to the boiler must be a minimum of _____" and must meet the ASME Code requirements for pressure and temperature.
_____ is the process where the water level in a boiler momentarily rises with an increase in steam demand.
_____ feed water regulators are found on package fire tube or water tube boilers were feed water pumps run either intermittently or continuously.
A three element feed water regulator measures the steam flow from the boiler, the _____ into the boiler, and the water level.
feed water flow
After blowing down a thermohydraulic feed water regulator, approximately 60 mins should be allowed for the regulator to _____ before being returned to service.
A(n) _____ is used in applications where there are varying flows of condensate and additional condensate storage capacity is required.
The _____ pump uses the shape of its casing to direct the discharge.
Some boiler rooms use _____ pumps for reverse or back up units in the event of an electrical power failure.
A(n) _____ feed water heater allows steam and feed water to mix with each other at atmospheric pressure to raise the temperature of the water.
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