Model recommended addition of flow straightening grid due to unstable flow patterns in suction piping due to multiple bends and plug valve with rectangular reduced area port opening. 3. 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. This is BAD; therefore you must place the reducer in the top flat . How can you calculate line loses in the suction pipe if the liquid is forced through only part of the pipe because the rest of the pipe is occupied by a large air pocket? This also helps produce an even flow to the pump and avoid cavitation. Eccentric reducer Always use an eccentric reducer at the pump suction when a pipe size transition is required. Eccentric Reducer Material and Grades. 5 Fitting: Reducer for avoiding air pockets. Why eccentric reducers are preferred in pump suction? Larger suction piping on the suction side is usually preferred if the liquid viscosity is greater than water. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Slope upward to pump. size. This also helps produce an even flow to the pump and avoid cavitation. The top of the reducer should go straight into the suction flange. The gradual accumulation of air in a concentric reducer can result in a large bubble, causing the pump to stall or cavitation when drawn into the pump. sidebar. Besides, why eccentric reducer is used in pump suction? Concentric reducer is recommended for vertical inlet (suction) piping or horizontal installations where there is no potential for air vapor accumulation. 3. The best solution is to use an eccentric reducer orientated to eliminate the possibility of air pockets. Eccentric Suction Reducer 125#. 04/18/2012 2:05 PM. When the source of supply is above the pump, then the eccentric reducers must be placed with the flat side at the bottom. Solution: Move eccentric reducer from pump suction nozzle to upstream location at least as much as HI 9.6.6 recommends. The tee can be equal tee to connect three equally sized pipes or unequal tee to connect unequally sized pipes. So, please remember - eccentric reducer FSU is what should be used in a horizontal centrifugal pump suction line. 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. Available texts often give no indication as to whether the pumpage c 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. Eccentric type, TOP Flat is selected for suction pump. 14 1 and noted that this was quite typical of illustrations found in many textbooks. Check the pump selection, change the suction pipe 3. Eccentric reducer (FSU) prevents vapor from being trapped and encouraging the phenomenon of cavitation which can further damage the pipe and pump impeller. Maintain 5 to 10 pipe diameters of straight pipe between the tower and the pump. Eccentric reducer is typically installed at the centrifugal process pump suction. The fitting is then hot dipped galvanized. An eccentric reducer with the flat side on top is typically the prescribed reducer to be used. Eccentric type, TOP Flat is selected for suction pump. 1.4462 The lowering of the pressure of the line fluid lowers the vapor pressure in the line. The ability of a concentric reducer to provide an improved approach flow to the pump while still allowing air to be transported through the fitting is investigated. 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. 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. Conduct physical modeling to confirm. The straight run shall be of the same line size as the pump suction nozzle. If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. An eccentric pipe reducer fitting is manufactured with the smaller outlet off center to the larger end, which allows it to align with only one side of the inlet. 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. Products:Eccentric Reducer/ECC reducer. Eccentric reducer in pump section pipeing minimized accumulation of any air or gas bubbles in the suction. An eccentric reducer, used as a transition piece between a centrifugal pump suction flange and the suction piping flange, must be installed with the eccentric portion below the suction pipe centerline to _____. See foundation section. You must ensure proper installation of eccentric reducer in pump suction piping to minimize accumulation of any air or gas bubbles in the suction. 7. Branch fitting for avoiding air pockets. The most trusted supplier of fire pumps and parts for your Fire Suppression System needs. This configuration prevents air pocket accumulation at the upstream end of the reducer. Art Montemayor, senior process engineer Universal Ensco, Inc., Houston, Texas. Eccentric reducers are used at the suction side of pumps to ensure that air does not accumulate in the pipe. Suction pump service fluid is liquid. Eccentric reducers with the flat side up are used for all pump suction lines (excluding pumps handling slurry) on horizontal lines. pump suction and to maintain pump prime after shut-off. Eccentric reducers installation instructions. Once, a pump user referred to Fig. Eccentric Reducer. A reducer is also installed upstream and downstream of pressure safety valves (PSVs) in flare lines. Most reducers are going to be concentric. An eccentric reducer differs from a concentric reducer in that the centerlines of the openings on each end of the fitting do not line up. An Eccentric Reducer is used on the suction side of a fire pump assembly to reduce the likelihood of air pockets entering the pump impeller. In turn, the eccentric reducer may be placed at the inlet of the pump and should be positioned so the straight side is up. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. In essence, Fig. Pump Suction Pipe Size 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. . The suction components shall consist of all pipe, valves, and fittings from the pump suction flange to the connection to the public or private water service main, storage tank, or reservoir, and so forth, that feeds water to the pump. Using eccentric reducers on the horizontal run of suction piping is technical and very important in most all pump installations. The ability of a concentric reducer to . The reducer shall be close to the pump inlet. Larger suction piping on the suction side is usually preferred if the liquid viscosity is greater than water. In some instances, an eccentric reducer is installed on the suction side of the pump when a pipe size transition is required. Fig. Always use an eccentric reducer at the pump suction when a pipe size transition is required. RE: Pump Eccentric reducers - bottom flat / top flat ApC2Kp (Mechanical) 31 Aug 07 10:59. mfelzien, Eccentric reducers are used when the pipes have to maintain the same top or bottom level. Re: Eccentric Suction Reducer and Concentric Discharge Reducer 02/06/2015 2:30 PM By the way, the pump operating point (total dynamic head) with the friction losses that may be created due to reducers, match the rated point as per the pump curve. A horizontal suction pipe must have a gradual rise to the pump. Make sure eccentric reducers are not installed upside down at the pump suction. Types of Piping Reducers based on End Connection Read PDF Data Sheet. Choose an option 10 x 8 4 x 3 5 x 4 6 x 4 6 x 5 8 x 5 8 x 6. To avoid condensate accumulated which might will be potential cause slug flow, the eccentric, BOTTOM Flat type shall be used. 4.16.6.4 requires the use of eccentric reducer where the suction pipe and pump suction flange are not of the same size. To avoid build up vapor or bubble in the system, the eccentric type with TOP FLAT should be used. $ 165.00 - $ 335.00. See illustration GS-0089. This will avoid an air pocket at the pump suction and allow air to be evacuated. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Suction Pump. Concentric reducers can cause accumulation of vapor or air in upper pockets. They are: (1) A long-radius sweeping 90º elbow in the vertical plane, and (2) an eccentric reducer oriented with the flat at the top. A = Suction Pipe Œ NFPA 20, Section 5.14.3.4, fiThe size . 6. The eccentric pipe reducers allow simple connection of different sized pipes. Pipe velocity must not exceed the suction nozzle velocity. The eccentric pipe reducers allow simple connection of different sized pipes. To avoid build up vapor or bubble in the system, the eccentric type with TOP FLAT should be used. This will avoid an air pocket at the pump suction and allow air to be evacuated. Info Buy Eccentric Suction Reducers; Showing the single result. a) prevent the formation of air pockets b) allow sediment to settle on the bottom Figure 7 illustrates an elevation (side) view of a double suction pump with two maybe not perfect, but nevertheless better, practices. Eccentric Reducer flat side up. 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. If an eccentric reducer is used FSU at the pump suction, the tiny bubbles which we talked about earlier would go into the pump without getting a chance to gather and grow. Pipe from the pump suction flange to the pipe rack, not the other way around. UL Listed Flanged Fittings Castings conform to ASTM A126 and ASTM A48 Dimensions conform to ASME B16.1 and ANSI/AWWA C110/A21.10 Clear. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Valve stems, T Branches and elbows should be installed perpendicular to the pump shaft, not at right angles. Eccentric reducers are traditionally recommended for the pump suction reducer fitting to allow for transportation of air through the fitting to the pump. 1 indicates that, with a suction line entering the pump in the horizontal plane, the eccentric reducer is placed with the flat at the top. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Picture 1 - Eccentric reducers installation when source of supply is below or above the pump suction nozzle. It's the pump SUCTION that needs to be an eccentric reducer that is always flat on top (F.O.T.) Equalizing lines are required for equal sump levels. If concentric reducer are used, their upper part allow accumulation of trace amounts of air or vapours at the pump section. Eccentric reducer are commonly introduced at the divergent procedure pump suction spots with a specific end goal to encourage a legitimate move from the bigger breadth (low stream speed, moderate rubbing misfortune)suction piping to the pump suction spout. They are commonly used where the diameter of the pipe on the upstream side of the fitting is larger . Concentric or Eccentric Reducers do not "cause" cavitation and they do not prevent cavitation. It's the pump SUCTION that needs to be an eccentric reducer that is always flat on top (F.O.T.) Eccentric reducers are used on the suction side of pumps to stop air trapping in the tubing. Consider eccentric reducers on the suction side. Steam Flow. When liquids are pumped that carry a small fraction of a heavier and immissible liquid the practice is to put in an eccentric reducer with the flat side on the bottom. In case of long horizontal pipe runs, air pockets are avoided by . Eccentric reducer offset table to eccentric reducer. Eccentric adapters should be installed straight side up, as pictured, to avoid air pockets from forming. 2. Suction Pump. Eccentric renders: are fitted between two different pipe diameters. The purpose of an eccentric reducer on the suction side of a fire pump (when a size change is necessary) is to create a horizontal transfer of air/water into the pump. Eccentric reducers installation instructions. Limit reducers to just one pipe size change. The suction of a pump causes the lowering of the pressure in the suction line to the pump. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. Steam Flow. Upvote (0) Downvote (0) Reply (0) See More Answers The bottom flat eccentric reducer type is used for pipe-racks (the bottom of the reducer is flat and at the same level of the bigger sized run pipe), while the top flat pipe reducer type is used at the inlet of piping suction pumps as shown in the image below (this setup prevents the formation of vapor traps in the pipeline): . Suction pump service fluid is liquid. Eccentric Reducer is used with flat facet up in pump suction to avoid cavitation. See Fig. The horizontal eccentric reducer at the inlet of centrifugal pump is generally arranged at the top level, but when the reducer is directly connected with the upward bend elbow, the bottom level arrangement can be adopted. A reducer is a constriction and requires careful design to avoid both turbulence and the creation of pockets where air or vapour might collect. Title: Review and optimisation of pump suction reducer selection Author: RM Mahaffey Supervisor: Professor SJ van Vuuren Department: Civil Engineering University: University of Pretoria Degree: Master of Engineering (Water Resource Engineering) Eccentric reducers are traditionally recommended for the pump suction reducer fitting to allow transportation of air through the fitting to 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. The pump suction line shall have a minimum straight run of five pipe diameters between between the pump suction flange and the first elbow, tee, valve,reducer,permanent strainer or other obstruction. • Use pipe, tubing, or reinforced hose to make suction connection . To avoid condensate accumulated which might will be potential cause slug flow, the eccentric, BOTTOM Flat type shall be used. It also increases the liquid velocity at pump suction, which is undesirable. 6 Fitting; For further fittings see bellmouth, intake chamber and intake elbow (see Inlet conditions). of the pump an eccentric reducer needs to be installed. Placing an eccentric reducer at the pump's suction flange should be done with the smaller diameter (pump flange) AT THE TOP. The pump thus avoids the above mentioned high shock loads. In a concentric reducer, air gradually accumulates and form a large bubble that could eventually cause the pump to stall or cause cavitation when drawn into the pump. This way one can avoid air getting trapped inside the pipeline during initial venting through pump casing and will help in avoiding Cavitation. In slurry pumps for primary and secondary mill circuits, eccentric "Flat on Bottom" reductions (Figures 31, 33 and 34) are generally recommended so as to avoid the settling of particles in the suction piping; in circuits of this type the particles present in slurry are larger in size, so the sedimentation speed is greater. End Suction Pump Parts; Engine Accessories; Fire Suppression Pumps; Fire System Accessories; Jockey Pumps; Rotating Assembly; Vertical In-Line Pump Parts . The reducer must be installed with straight side up so that it can prevent trapping air at the pump suction. The eccentric reducer on . Did you will be run along wind direction angle is reduced flow. Footer. 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 bigger gas bubbles near the pump suction. Support pipe as required NOTICE: All connections must be air tight. Both of these have a consequence regarding flow. Eccentric branch fittings should be installed in horizontal suction lines to avoid the formation of air pockets. We have the right . Eccentric reducer is commonly introduced at the divergent procedure pump suction spots with a specific end, goal to encourage a legitimate move from the bigger breadth (low stream speed, moderate rubbing misfortune), suction piping to the pump suction spout. Duplex & Super Duplex Steel Eccentric Reducer: ASTM A 815, ASME SA 815 UNS NO S31803, S32205.UNS S32750, S32950. The other application of an eccentric reducer is to increase the line size to 4″ for thermowell (temperature gauge) installation. Note: the straight run length of five pipe diameter is usually . Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers. Werkstoff No. For Han-Dee Primer connection, see start-up. 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 . 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. As a general rule of thumb, suction pipe velocities should be kept below 2 m/s. (More on reducers and their implications mo-mentarily). 2. FREE Standard Shipping. after caesar 4.4 version caesar has facility to model reducer here i want to know if we model a eccentric reducer in pump suction line(top discharge-end suction),we found that at pump nozzle there will be a minor displacement(0.0002")vertical upward direction.as far as vendor . In case of centrifugal pumps, if this vapor can cause pump cavitation if it escapes into the pump. Reducer fittings used in pump inlet pipe work are divided into two types—concentric and eccentric reducers.
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