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Why there is Sever cavitation sound at the pump suction for the A pump while there is no problem at the B pump which is operating in parallel with this pump.?
Wiki User
∙ 15y ago
this is overhang centrifugal pump . the suction drum level , suction strainer and suction pipings were all checked and found OK
Wiki User
∙ 15y ago
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What is cavitation and priming?
1. PRIMING LOSS: This is the suction loss for a pump whose NPSH is (-ve)2. CAVITATION: It is also suction loss by forming cavity of a volatile liquid whose NPSH(a) is belowNPSH(r) eg..Choking or blockage of suction strainers, closing of suction valve of apump when running.3. VAPOUR LOCK: This is also loss of pumping due to blockage in discharge of a pump..closing of discharge valve and running for more time..running the pump with in adequate minimum flow..liquid above boiling pointHence Cavitation, Vapour Lock and Primimng loss are different
Why is the suction line of a pump larger than the discharge line?
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 has the author G E Thomas written?
G. E. Thomas has written: 'Assessment of the possibility of using suction to inhibit cavitation cylindrical sections'
How cavitation can be eleminated in a pump?
cavitation is caused when vapour pressure in the fluid in higher equal to the surrronding presure. in the case of centrifugal pump, when the hydraulic pressure (due to height) in the fluid falls below the vapour pressure of the fluid itself, cavitation wil occur.
In what position is a suction service valve when operating?
middle position
What indicates a problem while inspecting a suction line of an air conditioner?
"What" on the suction line of an air conditioner indicates a problem?
Will air in the pool filter harm the above ground pool pump?
A small amount probably won't but it suggests a leak in the suction line; and it will reduce the pump's ability to prime itself, which is bad. A lot of air won't do the pump or its motor any good. I'm not sure if cavitation is a problem in pumps.
What is total operating head?
static,dynamic,friction, velocity,suction, preasure
How do you prevent cavitation in pumps?
You have to increase the suction head, or decrease the speed of the pump. As you may know, cavitation happens when the static pressure at the pump inlet minus the equivalent pressure of the fluid velocity in the pump drops low enough to vaporize fluid. To prevent it, the static pressure needs to be higher or the velocity needs to be lower.
Will faulty foot valve restrict supply of water?
faulty foot valve will lead to absence of water column in a line. this gives rise to cavitation in pumps. As a result, suction of pumps is affected.
Why the Deaerator is placed at height and mostly at 15.5mtr?
By putting deaerator at height, vapour doesn't form at the suction area of feed water pumps so cavitation phenomenon in the impeller can be prevented. also to get NPSH.
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.
