Why eccentric reducer is used

Register now or log in to join your professional community. Concentric Reducers are used for vertical piping whereas eccentric reducer are used at Pipe rack to maintain bop and Flat side Up at Pump Suction to avoid cavity.

Eccentric reducers are used to maintain the same bottom of pipe. Exceptions are at pump suction where we should haveflat side up in order to avoid bubble formation in the pump inlet which could lead to cavtation and damage of impellars of the pump.

All other places concentric reducer is fine. Other exception is with control valves. A eccentric reducer with flat side down will give a more constant flow through the control valve rather than a concentric reducer or eccentric reducer with flat side up, which will give your more flow disruption and will cause problems with your control valve.

Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. 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. There are two main types of reducer: Concentric reducers Eccentric reducers Reducers are usually concentric but eccentric reducers are used when required to maintain the same top-or bottom-of-pipe level.

Concentric Reducer In Concentric Reducer the reduction of the pipe size is achieved by decreasing the diameter of the fitting at a constant rate over a specified length, maintaining symmetry around the fitting.

If the design fails to produce a uniform velocity distribution profile at the pump inlet many pump problems and failures can be traced. For example,. Any of these issues could lead to pump failure. 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. A reducer is a constriction and requires careful design to avoid both turbulence and the creation of pockets where air or vapour might collect.

The best solution is to use an eccentric reducer orientated to eliminate the possibility of air pockets. Because we want minimum frictional losses in pipe and full bore flow to the impeller eye. For the same flow rate, if we increase the line size, fluid velocity as well as frictional losses decreases.

Greater the area of pipe, lower is the velocity, lower frictional loses higher NPSHa , lower is differential pressure generated by the pump and there by lower power required by motor to drive the pump. Also the flow being reached at the pump inlet or impeller will not be of uniform velocity profile causing various issues discussed above.

The right pump suction pipe size is a compromise between cost bigger pipes are more expensive and excessive friction loss small pipes cause high friction loss and will affect the pump performance.

Your first and last name required. Your e-mailadress required. Your telephone number. I apply for the job:. Your motivation. Upload your CV. Reducers Reducers are applied in piping systems, in order to have the pipe diameter differ from one end to the next.

Types There are 2 types of standard reducers available: concentric and eccentric reducers. Arcus Arcus provides a wide range of butt weld reducers in various stainless steel grades. Get in touch. Our services Pipes, flanges and fittings Steel pipes, flanges and fittings Machining and Pickling. Privacy Privacy statement Cookies.