A. Eccentric reducers are used in pump suction to avoid cavitation and concentric reducers are used in pump discharge. A pump is not capable to handle vapor, it . A reducer is a constriction and requires careful . Why do we use concentric reducer in pump discharge? 2 should clarify . My Question is, do we use a reducer to avoid cavitation in the pump. Eccentric, having the axis away from the center, reducers are used under suctions, meaning before the pump. It is done all the time, however it is normally required to change the discharge line from the (smaller) pump discharge size to a larger pipe line size. So lets discuss about the working principle of a simple centrifugal . This will avoid an air pocket at the pump suction and allow air to be evacuated. Can we use eccentric reducer in pump discharge? Use a multi-stage turbine pump for deep wells . Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. The purpose of the foot valve is to preclude back-flow from the pump through the suction line . Eccentric reducers are more often used when the pipework lays on a pipe rack. An eccentric reducer with flat on top is the best way to minimise this. Suction piping should be at least one size larger than the suction flange at the pump. First of all the main reason there is a reducer in a pump suction line or a pump discharge line is because the pipe line size is different from the pump nozzle size. The process engineer determines what line . This way one can avoid air getting trapped inside the pipeline during initial venting through pump casing and will help in avoiding Cavitation. The use of concentric reducers should be considered since they are much more effective at converting the velocity pressure to static pressure. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. The same fitting can be used in reverse as an eccentric increaser or expander. Eccentric screw pumps. Eccentric reducers are more often used when the pipework lays on a pipe rack. Page 2 of 4 In the case of a liquid source above the pump suction, and particularly where the suction line consists of an eccentric reducer followed by an elbow turned vertically upward and a vertical pipe length—all assembled in that sequence from the pump suction flange upstream—it will be mandatory for the eccentric reducer flat side to be at the bottom. Flow control. Eccentric Reducers Installation When the source of supply is above the pump, then . concentric reducer are when wedon't want to change the centre line for fluid while eccentric is used when we want to change the centre line for fluid Why flat side up reducer is used at pump. Try to Keep the reducer close to the pump . Larger suction piping on the suction side is usually preferred if the . An eccentric reducer is a fitting used in piping systems between two pipes of different diameters. Explain pump cavitation? Why pump is not used for air? Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. It's the pump SUCTION that needs to be an eccentric reducer that is always flat on top (F.O.T.) Eccentric reducers are more often used when the pipework lays on a pipe rack. Yes! Q:-How can flanges be classified based on Pressure . Eccentric Reducers Installation Eccentric reducer is recommended for horizontal flow to the pump. required. Use eccentric reducers rather than concentric reducers at the pump suction. This will avoid an air pocket at the pump suction and allow air to be evacuated. What happens if suction line is too small? Eccentric reducer. The major concern about eccentric reducers is that they can collect liquids or gasses in one area if they are not properly aligned. Eccentric reducer in pump section pipeing minimized accumulation of any air or gas bubbles in the suction. What will happen if suction valve of centrifugal pump is closed? Those reducers also come in handy where there is a pump installed in liquid transporting systems. On the suction side, the diameter can be the same size, but often engineers select a size or two bigger, thus requiring an eccentric reducer. In terms of diameter, discharge pipe diameter should normally match the discharge flange on the pump but can be larger to reduce friction losses and decrease system pressure. Why suction is bigger than discharge? Eccentric reducers are more often used when the pipework lays on a pipe rack. You must ensure proper installation of eccentric reducer in pump suction piping to minimize accumulation of any air or gas bubbles in the suction. _____ Look over to the next challenge Register to Reply Good Answer . If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. Fairs; Brochures; Instructions | Spare parts; Multi-component filling and dosing system. Concentric reducers can cause accumulation of vapor or air in upper pockets. _____ The purpose of the foot valve is to preclude back-flow from the pump through the suction line . A. As noted above, a test header can be installed without the use of a metering device and loop.Located on the discharge side of the pump, the test header must be installed on an exterior wall of the pump room or pump house, or in another location outside the pump room so as to allow for adequate water discharge during testing. Concentric reducers will trap air. Concentric reducers will trap air. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. Larger suction piping on the suction side is usually preferred if the . Because of the flat side, aligning and securely mounting the pipes to the rack is easier. In addition to our drum pumps for low-viscosity and medium-viscosity media up to 1000 mPas, we can also offer you a complete range of eccentric screw pumps for pumping highly viscous, still flowable media. I have seen a few (not many) installations where the pump discharge flange is larger than the required line size. A concentric reducer is used to join pipe sections or tube sections on the same axis The concentric reducer is coneshaped, and is used when there is a shift in diameter between pipes For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level Why do we use eccentric reducer in pump Many times the discharge size of a pump is specified small, to allow the use of lower cost valves at the discharge and then expanded up by means of eccentric reducers. Once, a pump user referred to Fig. What happens if you close the discharge valve of a centrifugal pump? In terms of diameter, discharge pipe diameter should normally match the discharge flange on the pump but can be larger to reduce friction losses and decrease system pressure. A reducer fitting is typically used in pump station pipe work to reduce the size of the suction pipe to match the size of the pump suction end flange. Pump Suction Pipe Size It's standard practice to employ suction-side piping one or two sizes bigger than the pump inlet. It is always a good idea to increase the size of the suction and discharge pipes at the pump nozzle in order to decrease the head loss from pipe friction. The pipe diameter can be larger to reduce friction losses and to decrease system pressure. Eccentric reducer is typically installed at the centrifugal process pump suction. In case of centrifugal pumps, if this vapor can cause pump cavitation if it escapes into the pump. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. Eccentric reducers with the flat side up are used for all pump suction lines (excluding pumps handling slurry) on horizontal lines. The . This can lead to creation of bigger gas bubbles near the pump suction. Put the flat on top when the fluid is coming from below or straight (see next Figure) and the flat on the bottom when the fluid is coming from the top. We rarely pass up an opportunity to highlight some of his experience-based comments. Until his death (at age 84, in 1995), world-renowned pump expert Igor Karassik frequently corresponded with the writer and other pump users on pump-related subjects. This will avoid . A. If concentric reducers are used, their upper part can allow accumulation of trace amounts of air or vapors at the pump suction. My Question is, do we use a reducer to avoid cavitation in the pump. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. In addition to our drum pumps for low-viscosity and medium-viscosity media up to 1000 mPas, we can also offer you a complete range of eccentric screw pumps for pumping highly viscous, still flowable media. Eccentric reducers are more often used when the pipework lays on a pipe rack. How do you install eccentric reducer? Occasional damage on the discharge side due to liquid separation. Figure 1 Eccentric reducers at the pump suction . you can put a reducer in the discharge line of a pump. Can we use eccentric reducer in pump discharge? What would happen if we use concentric reducers in pump suction? The process . That said, Fig. What will happen if we reduce the discharge pipe size of a pump? Answer (1 of 2): Starting with the Bernoulli's equation we know that with increase in area the velocity head decreases and to compensate that effect pressure head will increase accordingly so that the energy remains conserved. Besides this, it helps produce an even flow to the pump and avoid cavitation. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. 21. The suction side of a centrifugal pump is sensitive to any flow disturbance or air entrapment. In terms of diameter, discharge pipe diameter should normally match the discharge flange on the pump but can be larger to reduce friction losses and decrease system pressure. The two types of reducer fittings can be described as: Answer: To reduce the friction factor. Check valves are installed on pump discharge lines to prevent liquid flow reversal with the succession of pumping. Larger suction piping on the suction side is usually preferred if the liquid . Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers. Eccentric reducer. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. If a reducer is required on the outlet port of the pump and the discharge is vertical, a concentric reducer should be used. Put the flat on top when the fluid is coming from below or straight (see next Figure) and the flat on the bottom when the fluid is coming from the top. This will avoid an air pocket at the pump suction and allow air to be evacuated. Use of a discharge pipe smaller than the pump discharge outlet increases the total pump head but decreases the volume. Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers. If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. an air pocket at the pump suction and allow air, gas or vapors to be evacuated. The gradual accumulation of air in a concentric reducer could result in a large bubble that could eventually cause the pump to stall or cause cavitation when drawn into the pump. Service. 7. On the discharge side of the pump. The gradual accumulation of air in a concentric reducer would result in a large bubble that could eventually cause the pump to stall or cause cavitation when drawn into the pump. 4. Hoses are connected to the test header during testing to allow for . The eccentric reducer on the pump suction reduces pump cavatation (pump catching air). Why do we use concentric reducer in pump discharge? Check valves are installed on pump discharge lines to prevent liquid flow reversal with the succession of pumping. Be sure the eccentric reducer is not installed up side down. A reducer fitting is typically used in pump station pipe work to reduce the size of the suction pipe to match the size of the pump suction end flange. Why eccentric reducers are preferred in pump suction? Does suction pressure affect discharge pressure? Depending on end connections of this fitting with a straight pipe . Always use an eccentric reducer at the pump suction when a pipe size transition is required. Many pumps are manufactured with suction and discharge flanges of a different size than the suction and discharge sizes listed in Table 4.26 (a), so the size must be adjusted accordingly, typically with eccentric or concentric reducers installed directly on the pump flange. Those reducers also come in handy where there is a pump installed in liquid transporting systems. 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