What does a boiler feed pump do?

What does a boiler feed pump do?

Boiler feed pumps are also referred to as feed pumps (see Reactor pump) and designed as multistage radial flow pumps. (Also see Multistage pump.) They serve to feed a steam generator such as a boiler or a nuclear reactor with a quantity of feed water corresponding to the quantity of steam emitted.

What water source provides the supply to the main boiler feed pumps?

A boiler feed water pump is a pump that is specifically designed to pump feed water into a steam boiler. The water may be supplied by an outside source or be returning, recycled condensate that is produced via the condensation of steam generated by the boiler.

Why feed water treatment is necessary in a boiler?

Water has higher heat capacity than most other substances. Boiler water is treated to prevent scaling, corrosion, foaming, and priming. Chemicals are put into boiler water through the chemical feed tank to keep the water within chemical range. These chemicals are mostly oxygen scavengers and phosphates.

Which pump used in boiler feed?

There are two types of pumps that are most often used for boiler feed water applications: stamped stainless steel vertical multistage inline pumps and multistage horizontal ring section pumps.

How do I choose a boiler feed water pump?

16 Steps to Proper Boiler-Feed-Pump Selection

1. Determine the control method to be used.
2. Calculate the base flow rate.
3. Add for continuous boiler blowdown flow.
4. Add for bypass flow, if required.
5. Determine the total flow rate required.
6. Calculate base head for the feed pump.
7. Add all suction-piping head components.

What will happen if temperature of the water in a boiler is rises?

When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. This will cause breaks to begin occurring at valves and connectors.

What is the source of boiler feed water?

Both hydronic boilers as well as steam boilers require a water source for their operation. This boiler feed water can be obtained either in the form of city water supply or well water that is provided by the pump.

Why blowdown is provided in a boiler?

The primary purpose of blowdown is to maintain the solids content of boiler water within certain limits. This may be required for specific reasons, such as contamination of the boiler water. In this case, a high blowdown rate is required to eliminate the contaminants as rapidly as possible.

Which one is not a boiler accessories?

2. Which of the following is NOT a boiler accessory? Explanation: The correct answer is mud hole (or sight hole). Feed pump, steam trap, steam separator are all boiler accessories whereas a mud hole is a boiler mounting.

How do I know what size pump I need for my boiler?

1 GPM = 10,000 BTU/hr, meaning that for every 10,000 BTU’s of heat load the circulator must output a 1 gallon per minute flow. Assuming that system calls for 100,000 BTU/hr, a circulator pump should have a minimum 10 Gallons Per Minute flow rate at a given pressure drop.

How do I size a boiler feed pump?

Another quick rule of thumb is that 1/10 of a gallon is needed for every boiler horsepower. So a 500 HP boiler will need a pump capable of delivering 50 gpm. An 800 HP boiler will need an 80 gpm pump.

What do you need to know about boiler feed pumps?

Here are six interesting facts you should know about boiler feed water pumps. 1. Boiler feed pumps are used to supply fresh water to a boiler. Condensation that forms in the boiler systems is typically recycled and fed back into the boiler with condensate return pumps. 2.

What causes a boiler to have low water?

Some common causes of low-water conditions include: Feedwater pump failure. Control valve failure. Loss of water to the deaerator or make-up water system. Drum level controller failure.

Can a boiler pump handle both hot and cold water?

Nowadays, almost all boiler feed pumps must be able to handle both cold starts (high-temperature shock loads) and semi-warm starts without any damage. In these start-up procedures hot feed water abruptly flows into the cold pump, which results in the inner components heating up much faster than the pressure boundary.

What is system resistance of a boiler feed pump?

The curve denoted as ‘system resistance’ is the relationship between feedwater flow and the head that has to be produced by the boiler feed pump to pump the feedwater into the boiler. Also shown in the diagram are the design values of feedwater flow for the turbine plant, boiler plant and the feed pump itself.

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