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The ARC valve provides protection for centrifugal pumps during low flow conditions. It recirculates a minimum flow requirement automatically to the deaerator to prevent the pump from overheating and causing internal damage. Pump manufacturers will dictate a pump's minimum flow requirement. The ARC valve will be designed to flow normal capacities through the main valve and also size the bypass to handle the minimum flow. Additionally, the flow sensing element, a disc, also acts as a check valve to prevent reverse flow to the pump.
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Why is used the balancing line in boiler feed pump and its direction of flow?
In boiler feed pumps usually the discharge pressure is 20 to 30 times tie suction Pressure so to protect the pump balancing line is given from discharge to suction.
What is the function of back pressure valve in Boiler feed pump?
The function of back pressure valve is to prevent back flow to the pump in case there is an obstruction on downstream side of valve.
What is the difference between boiler and reboiler?
In boiler the feed is only liquid but in reboiler the feed may be any liquid. second is that, reboiler do partial vapourization but the boiler does complete vapourization
What is TDBFP?
TDBFP = Turbine Driven Boiler Feed Pump
Hot water baseboard heating system?
Hot water heating systems must be free of air to operate properly. The art of purging air from one of these systems comes with experience. There are usually purge setups in the piping, if the system was installed properly. The purge setup will consist of one ball valve or gate valve and one boiler drain somewhere in the loop or zone. There should be a half inch copper line connected to the water in the house that's used to fill the boiler and to purge air. This line will have an auto feeder valve somewhere between the tie into the water lines and the boiler. There is a lever on top of the auto feed valve. This lever is to override the automatic setting that keeps the boiler at the right pressure. When lifted up the lever allows city water pressure to be fed into the boiler. When the lever is down the setting will be somewhere between 12 and 25 pounds. This safeguards the system in case of a leak somewhere. Water will be added automatically. The way we purge the system is by hooking a hose to the boiler drain in the purge setup. Close the ball or gate valve and feed water through the system and out the boiler drain. The ball valve is to make sure the water we're putting in goes through the entire system before exiting. After the hose is hooked up and opened and the ball valve is closed, lift the lever on the automatic feeder and force city water into the boiler, around the loop your purging and out the hose. Be sure to watch the pressure gauge on the boiler and never exceed twenty five pounds. You will set off the pressure relief valve at 30 pounds. This is why the hose must be opened before the lever is lifted on the auto feeder. Put the hose end into a five gallon bucket and watch for air bubbles. Once the air bubbles have subsided, allow the system to purge for a few more minutes. Close the lever on the auto feeder and then the boiler drain. Open the ball valve and you're done.
What is boiler feed water pump?
Boiler feed pumps are an important part of any boiler operation. They control the amount of water fed to the boiler and the manner in which it is fed.
What is the feed check valve of boiler?
The feed check valve of a boiler is on the line coming out of the boiler it is usually to prevent the water from going back in to the boiler its coming out of so it would build up excessive amounts of pressure which will cause the t&p valve to blow temperature and pressure
In boiler feed water line whether a non return valve should precede or succeed the delivery valve of feed water pump?
In boiler feed water line the NRV is normally installed between Pump and stop valve if the line is short and an another NRV is installed at boiler entrance and after stop valve if the line is long or pump is 10 to 15 m away from the boiler.
What is the use of boilerfeed pump?
The boiler feed pump pumps hot feedwater into the boiler. The boiler pressure is to high for water to flow into it by gravity, so a pump is required.
What is NAS value of lube oil and the basics for determination required NAS value of lube oil for Boiler feed pumps?
Well, it depends on the lube oil you use. The basics for determination is usually common sense, to be honest. It will also depend on how big the boiler feed pumps are too.
Why is used the balancing line in boiler feed pump and its direction of flow?
In boiler feed pumps usually the discharge pressure is 20 to 30 times tie suction Pressure so to protect the pump balancing line is given from discharge to suction.
What is the function of back pressure valve in Boiler feed pump?
The function of back pressure valve is to prevent back flow to the pump in case there is an obstruction on downstream side of valve.
How boiler feed valve works?
There are automatic boiler feeder and manual feeds and depending on the desired working pressure required that would determine the "SET" pressure of the feeder
What you will do if both feed pumps tripped when boiler is in service?
Immediately the load on Generator should be reduced to Zero n desynchronised, and the turbine be tripped.
What is boiler feed water?
Boiler feed is the fresh or treated water to replenish the water loss though evaporation or leak
What is the difference between boiler and reboiler?
In boiler the feed is only liquid but in reboiler the feed may be any liquid. second is that, reboiler do partial vapourization but the boiler does complete vapourization
What is Boiler feed pump?
Function - It adds the pressure to the feed water before it entyers into boiler feed pump suction Advantage - Ensures high margin NPSH A for boiler feed pump spinning at high rpm (5250Rpm) Drive for booster - Normally @1450 rpm Type of impeller- Mostly preferred Double suction
