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It is common practice to specify the pump suction line one size larger than the pump discharge line in order to increase the Net Positive Suction Head available (NPSHA) to the pump. A smaller suction line the same pipe size as the discharge line would result in more pressure drop in the suction line and reduce the amount of head available to the suction side of the pump. This in turn would result in an operating point closer to cavitation of the pump.
What else can I help you with?
With a centrifugal pump what will a blockage in the discharge or suction side do to the pump amps?
A blockage in the downstream side of the pump could make this pump work harder raising the amps as the pump now has to do more work to get through the line. An upstream blockage would make the pump spin more freely lowering the amps on the pump as it will not be doing any work.
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
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 type of heat pump system requires a secondary refrigerant?
A heat pump system that typically requires a secondary refrigerant is a hydronic heat pump system. In these systems, the primary refrigerant transfers heat to a secondary fluid, often water or a water-glycol mixture, which then circulates through radiators or underfloor heating to distribute warmth. This approach enhances efficiency and allows for flexible heating applications, particularly in larger or more complex systems.
What should Petroleum and hazardous liquid pipeline structures include?
Pump Stations
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.
Where is suction and discharge s?
Answer: The terms suction and discharge are the terms refer to hydraulics. In hydraulics if the the liquid has to be lifted or pumped to the usage area the hydraulic pump will be used . This pump will have to functions that is first suction to lift the fluid and the discharge or delivery . The familiar words in pair are lift and discharge; suction and discharge. The specification of pump for these terms are suction head and discharge head.AnswerThe suction pressure refers to the pressure of the referigerant being "sucked" back into the compressor. The suction pressure is a critical variable in ensuring the accuracy of the refrigerant charge, along with the tepmerature of that line as well. The "superheat", or heat added to the vapor in that line can be monitored in this manner.You have not mention which suction pressure... Actually Where ever the suction is presented that pressure is called suction pressure.... and suction pressure in practical cases normally always less that atmospheric pressure and in case of delivery pressure it is oppositeSaying that suction pressure is " the pressure of the referigerant being "sucked" back into the compressor " is not accurate.Simply , the suction pressure of a pump is the absolute pressure of a fluid , measured at the inlet of the pump ( in your answer , the pump is the compressor , and the fluid is whatever refrigerant. )The discharge pressure , is the absolute pressure of the liquid measured at the outlet of the pump.Obviously, the discharge pressure is usually bigger than suction pressure.
Why is pump suction bigger than discharge?
The pump suction is typically larger than the discharge to reduce the velocity of the fluid entering the pump, which helps to minimize turbulence and the risk of cavitation. A larger suction pipe allows for a smoother and more efficient flow into the pump, ensuring that it can operate effectively without drawing in air or creating pressure drops. This design choice also helps accommodate variations in flow rates and reduces the potential for blockages. Overall, it enhances the pump's performance and longevity.
Why concentric reducer is used in pump discharge?
The pump discharge reducer doesn't matter if it's concentric or eccentric. It's the pump SUCTION that needs to be an eccentric reducer that is always flat on top (F.O.T.) The eccentric reducer on the pump suction reduces pump cavatation (pump catching air).
What is the pipe size difference between pump suction and discharge?
idont knw
What is the definition of reciprocating pump?
a pump consisting of a piston that moves back and forth or up and down in a cylinder. The cylinder is equipped with inlet (suction) and outlet( discharge) valves. On the intake stroke, the suction valves are opened, and fluid is drawn into the cylinder. On the discharge stroke, the suction valves close, the discharge valves open, and fluid is forced out of the cylinder.
Where is the only true discharge line on a heat pump?
The only true discharge line on a heat pump is located on the compressor. This line carries the high-pressure refrigerant gas that has been compressed by the compressor and is then directed towards the condenser. It's important to distinguish this from the suction line, which carries the low-pressure refrigerant back to the compressor. Proper identification of these lines is crucial for maintenance and troubleshooting.
What does the capacity of a vacuum pump and its suction line size determine?
The capacity of a vacuum pump and its suction line size determine the efficiency and effectiveness of the vacuum system in removing air or gases from a space. A properly sized suction line ensures optimal airflow and minimizes pressure drops, allowing the pump to reach the desired vacuum level quickly. If the line is too small, it can restrict flow and reduce the system's overall performance. Conversely, a larger capacity pump with an appropriately sized line can handle greater volumes, improving the system's operational speed and reliability.
Are refrigerant temperatures and pressures in the cooling mode of a heat pump about the same in both the suction side and the discharge side of the system?
Yes refrigerant temperatures and pressures in the cooling mode of a heat pump is the same. They are both in the suction side and the discharge side of the system.
What is the maximum horizontal distance allowed in suction line of a pump which is above the water level?
The maximum distance will be relative to the efficiency of the pump and the rated flow of the pump vs the size of the suction hose. The more efficient the pump, the more vacuum it can draw, and the larger the suction hose in relation to the flow rating of the pump the farther you can move the pump away from the water. The manufacturer of the pump will have charts that will help you properly size and set up your pump for optimum performance.
What is the Use of Balancing line in Boiler feed pump?
Boiler feed pump's suction pressure be aprox. 15Kg/cm2 and discharge pressure be 180Kg/cm2. So the balancing line balance the pressure and protect the boiler feed pump. my quastion is that what is the working principal of balancing leak off
Why is Pump discharge line size smaller than suction line size?
An increase in any pipe diameter will lower the flow velocity, and therefore reduce head loss due to friction, but it is not immediately obvious to me why pump manufacturers provide a discharge side of smaller diameter than the suction side. I don't think it has anything to do with cavitation, maybe it is just to ensure that fluid flows easily away from the pump, since it will be travelling at a higher velocity in the discharge line than entering the pump on the suction side. Maybe the NPSHR values are derived from the difference in pipe diamters across the pump by the manufacturers, such that cavitation does become an (indirect) issue. Maybe somebody else can answer this one. The suction side of the pump normally has only atmospheric pressure of approximately 1 bar available to propel the oil into the pump. Using a larger suction diameter reduces friction loss, and keeps the fluid as close to atmospheric pressure as possible. Fluids will boil at a lower temperature when subjected to vacuum, and hydrauic systems already have a high temperature due to friction losses elsewhere in the circuit. If the suction side is allowed to develop too much vacuum, the lowered boiling point will be exceeded, and cavitation that is destructive to the pump will be induced. The problem can be alleviated by pressurising or elevating the oil tank to maintain a positive pressure at the pump inlet.
