Reciprocating pump calculations

Selection of the pumping equipment is a crucial point that determines both process parameters and in-use performance of the unit under development. During selection of the type of pump three groups of criteria can be distinguished:

Reciprocating pump calculations

How to calculate BHP of reciprocating pump

The piston pump is one of the most common reciprocating pumps. Prior to the development of high speed drivers, which enhanced the popularity of centrifugals, it was the pump of choice for a broad range of applications. Today, they are most often seen in low-to-moderate flow applications that require pressures up to 2,000 psi. Its close cousin, the plunger pump, can operate at a higher pressure (more than 40,000 psi). Although they look similar, their pumping action is slightly different.

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Traditional friction analysis of flows in pipes is based on constant, steady-state flows, as you would find in centrifugal pump flow. When starting a cp, there is a peak power requirement that occurs due of the extra energy required to accelerate the liquid from a zero velocity to a steady-state flow velocity.

Reciprocating pump calculations

C in the Equation for Reciprocating Pump Acceleration

For years Equations 1 and 2 have been used to estimate acceleration pressure. Within these equations is the constant C which has been evaluated for a limited number of cases. The constant C can be found by setting K = 1 then setting the equation for Pacc equal to the numerically derived value for acceleration pressure amplitude as described above and then solving for C.

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The direct acting pumps are one of the most common type of pump been used. It is been known so as in the particular design the pump rod is a direct extension of the piston rod in which the lower end is been directly connected to the piston in the cylinder. Single and Double action pumps is as mentioned earlier. Single action has a single suction and a single discharge per revolution and Double action pump has two suctions and discharges per revolution.

Engineering Essentials: Fundamentals of Hydraulic Pumps

A pump produces liquid movement or flow: it does not generate pressure. It produces the flow necessary for the development of pressure which is a function of resistance to fluid flow in the system. For example, the pressure of the fluid at the pump outlet is zero for a pump not connected to a system (load). Further, for a pump delivering into a system, the pressure will rise only to the level necessary to overcome the resistance of the load.


Reciprocating pumps (including diaphragm pumps, plunger pumps, and other positive displacementpumps) are used in many applications, including petroleum production facilities and refineries. 


The module consists of a mobile frame with an oil reservoir, a flow meter, valves and instruments to measure pump performance. The flow meter is a positive displacement unit, so that it still works correctly at any oil viscosity. Any of the optional pumps fit to the module. Two flexible, high-pressure pipes with quick-release, self-sealing connections connect the pump to the oil circuit.