To avoid cavitation, the pipework is connected to the pump via an eccentric reducer that has its flat side facing up. How many types of reducers are . 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. Concentric reducers = Pump discharge, vertical pipeline etc. So lets discuss about the working principle of a simple centrifugal . Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. Fairs; Brochures; Instructions | Spare parts; Multi-component filling and dosing system. where flow is coming from) is larger than the downstream side, and where there is a danger that vapour may accumulate. What happens if suction line is too small? Because of the flat side, aligning and securely mounting the pipes to the rack is easier. Eccentric, having the axis away from the center, reducers are used under suctions, meaning before the pump. 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. Occasional damage on the discharge side due to liquid separation. Eccentric Reducers Installation When the source of supply is above the pump, then . How do you install eccentric reducer? Eccentric reducers are more often used when the pipework lays on a pipe rack. 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. Always use an eccentric reducer at the pump suction when a pipe size transition is required. Eccentric reducers are more often used when the pipework lays on a pipe rack. I want to know in detail the reason of using the reducer & how does it work in both horizontal & vertical piping. If you need to control the flow, use . The purpose of the foot valve is to preclude back-flow from the pump through the suction line . 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. Questions relating to proper reducer application in centrifugal pump suction lines date back many decades. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. Eccentric reducer is typically installed at the centrifugal process pump suction. A. Eccentric reducers are used in pump suction to avoid cavitation and concentric reducers are used in pump discharge. Eccentric reducers are more often used when the pipework lays on a pipe rack. How do you install eccentric reducer? Vortexing can occur if any of the following conditions are present: Low liquid levels an air pocket at the pump suction and allow air, gas or vapors to be evacuated. you can put a reducer in the discharge line of a pump. 7. Concentric reducers will trap air. My Question is, do we use a reducer to avoid cavitation in the pump. Besides this, it helps produce an even flow to the pump and avoid cavitation. 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. A. The process . Eccentric reducer. I want to know in detail the reason of using the reducer & how does it work in both horizontal & vertical piping. What would happen if we use concentric reducers in pump suction? I have seen a few (not many) installations where the pump discharge flange is larger than the required line size. 2 should clarify . Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. An eccentric reducer is a fitting used in piping systems between two pipes of different diameters. 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. In a similar fashion, a foot valve is simply a form of check valve, usually in a vertical position, usually incorporating a strainer, installed in the pump suction line (see Figure 3). This can lead to creation of bigger gas bubbles near the pump suction. If the horizontal suction line carrying slurry inside then it is required to provide an eccentric reducer flat side down or flat side bottom type for smooth flow of slurry. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. Always use an eccentric reducer at the pump suction when a pipe size transition is required. An eccentric reducer with flat on top is the best way to minimise this. No. Hand pumps are suitable for many media and can be adapted to many containers and drums. Concentric reducers can cause accumulation of vapor or air in upper pockets. 7. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. Q:-What is the purpose of providing Graphite Pads in supports below shoes? We rarely pass up an opportunity to highlight some of his experience-based comments. If the horizontal suction line carrying slurry inside then it is required to provide an eccentric reducer flat side down or flat side bottom type for smooth flow of slurry. _____ Use a multi-stage turbine pump for deep wells . Yes! A reducer fitting is typically used in pump suction piping to reduce the size of the suction pipe to match the size of the pump suction end flange. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Explain pump cavitation? If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. The use of concentric reducers should be considered since they are much more effective at converting the velocity pressure to static pressure. Eccentric reducer (FSU) prevents vapor from being trapped and encouraging the phenomenon of cavitation which can further damage the pipe and pump impeller. What happens if you close the discharge valve of a centrifugal pump? Why suction is bigger than discharge? The eccentric reducer on the pump suction reduces pump cavatation (pump catching air). 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. Those reducers also come in handy where there is a pump installed in liquid transporting systems. It's the pump SUCTION that needs to be an eccentric reducer that is always flat on top (F.O.T.) Try to Keep the reducer close to the pump . Types of Piping Reducers based on End Connection. Always use an eccentric reducer at the pump suction when a pipe size transition is required. Concentric reducer is recommended for vertical inlet (suction) piping or horizontal installations where there is no potential for air vapor accumulation. Why do we use concentric reducer in pump discharge? This way one can avoid air getting trapped inside the pipeline during initial venting through pump casing and will help in avoiding Cavitation. On the suction side, the diameter can be the same size, but oftentimes engineers select a size or two bigger, thus requiring an eccentric reducer. Eccentric Reducers Installation Eccentric reducer is recommended for horizontal flow to the pump. 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. To avoid cavitation, the pipework is connected to the pump via an eccentric reducer that has its flat side facing up. Never put the control valve at the suction side, as it can cause more cavitation. 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. Eccentric reducers are more often used when the pipework lays on a pipe rack. 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. 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. Flow control. Use eccentric reducers rather than concentric reducers at the pump suction. 3. 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. What will happen if suction valve of centrifugal pump is closed? Eccentric reducer. 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. This configuration prevents air pocket accumulation at the upstream end of the reducer. 22. The . Use eccentric reducers rather than concentric reducers at the pump suction. Answer: To reduce the friction factor. Does suction pressure affect discharge pressure? Check valves are installed on pump discharge lines to prevent liquid flow reversal with the succession of pumping. On the discharge side of the pump. 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. Eccentric reducer Always use an eccentric reducer at the pump suction when a pipe size transition is required. The co-efficient of friction for Graphite Pads is 0.1 . Can we use eccentric reducer in pump discharge? These reduce in size to match the size of the incoming pipe connecting to the pump suction flange and the pipe size connecting to the pump discharge flange. Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers. Q:-How can flanges be classified based on Pressure . This will avoid an air pocket at the pump suction and allow air to be evacuated. To avoid discharge cavitation we can consider the below points: If needed, we can install a control valve in the discharge line to maintain the desired pressure. Eccentric Reducers Installation When the source of supply is above the pump, then . 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. Consider . This will avoid an air pocket at the pump suction and allow air to be evacuated. For dispensing of low-viscosity to medium viscosity media according . Why do we use concentric reducer in pump discharge? _____ Look over to the next challenge Register to Reply Good Answer . In case of centrifugal pumps, if this vapor can cause pump cavitation if it escapes into the pump. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Put the flat on top when the fluid is coming from below or straight and the flat on the bottom when the fluid is coming from the top. 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. A. 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. The process . Larger suction piping on the suction side is usually preferred if the . 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. Eccentric reducers with the flat side up are used for all pump suction lines (excluding pumps handling slurry) on horizontal lines. required. Depending on end connections of this fitting with a straight pipe . Upvote (0) Downvote (0) Reply (0) Answer added by Danilo Luna, Mechanical supervisor , Electro Mechanical Engineering Company W.l.l 4 years ago …See more no.use discharge line is concentric reducer Upvote (0) Downvote (0) Reply (0) Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. This can lead to creation of gas bubbles near the pump section. Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers. The major concern about eccentric reducers is that they can collect liquids or gasses in one area if they are not properly aligned. The two types of reducer fittings can be described as: 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. Once, a pump user referred to Fig. Eccentric reducer. Larger suction piping on the suction side is usually preferred if the . if we use concentric reducer at suction of pipe ,due to high turbulence flow of fluid ,some vapour pressure generate which generate bad effects on impeller of pump ,which decrease pump efficiency . Please, can anyone help me? The component at the discharge side should be installed in a manner that there should not be an air-trap. Eccentric reducer in pump section pipeing minimized accumulation of any air or gas bubbles in the suction. 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. Global Pumps suggest installing a discharge pipe diameter that matches the discharge flange on the pump. If the : discharge is horizontal an eccentric reducer should be used and should be positioned so the straight side is down. The same fitting can be used in reverse as an eccentric increaser or expander. Eccentric reducer in pump section pipeing minimized accumulation of any air or gas bubbles in the suction. 21. 1 . When used vertically, there is essentially no difference between a concentric or eccentric pipe reducer. The purpose of the foot valve is to preclude back-flow from the pump through the suction line . Concentric shares the same center, reducers are used under vacuum, meaning after the pump. 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. On the suction side, the diameter can be the same size, but oftentimes engineers select a size or two bigger, thus requiring an eccentric reducer. Hoses are connected to the test header during testing to allow for . In a similar fashion, a foot valve is simply a form of check valve, usually in a vertical position, usually incorporating a strainer, installed in the pump suction line (see Figure 3). Upvote (0) Downvote (0) Reply (0) See More Answers Eccentric reducers are more often used when the pipework lays on a pipe rack. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. 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 Why suction is bigger than discharge? This will avoid . Figure 1 Eccentric reducers at the pump suction . Use of a discharge pipe smaller than the pump discharge outlet increases the total pump head but decreases the volume. Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps. the pump does not care any more so you can use what is cheapest and most convenient. Service. The pipe diameter can be larger to reduce friction losses and to decrease system pressure. 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. Always use an eccentric reducer at the pump suction when a pipe size transition is. That said, Fig. Air pockets will form if we use concentric reducers in pump suction and this would lead to cavitation and the pump will be damaged. 4. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. The pump discharge reducer doesn't matter if it's concentric or eccentric. 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. Can we use eccentric reducer in pump discharge? Eccentric screw pumps. The suction side of a centrifugal pump is sensitive to any flow disturbance or air entrapment. A reducer is a constriction and requires careful . Pump Suction Pipe Size It's standard practice to employ suction-side piping one or two sizes bigger than the pump inlet. A larger suction piping on the suction side is usually recommended if the liquid viscosity is greater than water. The two types of reducer fittings can be described as: Why pump is not used for air? Why eccentric reducers are preferred in pump suction? A pump is not capable to handle vapor, it . Larger suction piping on the suction side is usually preferred if the liquid . Concentric reducers will trap air. The process engineer determines what line . 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. They are used where the diameter of the pipe on the upstream side of the fitting (i.e. Eccentric reducer (FSU) prevents vapor from being trapped and encouraging the phenomenon of cavitation which can further damage the pipe and pump impeller. Be sure the eccentric reducer is not installed up side down. This will avoid an air pocket at the pump suction and allow air to be evacuated. If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. To avoid cavitation . Those reducers also come in handy where there is a pump installed in liquid transporting systems. LOCATING VALVES : In suction .
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