API Std 674 Positive Displacement Pumps - Reciprocating

Covers the minimum requirements for reciprocating positive displacement pumps for use in petroleum, chemical, and gas industry services. Both direct-acting and power-frame types are included.

Pump Standard API 676

the minimum requirements for rotary positive displacement pumps for use in the petroleum, chemical, and gas industries. It provides a purchase specification to facilitate the manufacture and purchase of rotary positive displacement pumps.

Centrifugal Pump Affinity Laws

The Affinity Laws of centrifugal pumps or fans indicates the influence on volume capacity, head (pressure) and/or power consumption of a pump or fan due to
change in speed of wheel - revolutions per minute (rpm)
geometrically similarity - change in impeller diameter

Note that the affinity laws for fans are not identical with pumps.
Pump Affinity Laws
Volume Capacity

The volume capacity of a centrifugal pump can be expressed like

q1 / q2 = (n1 / n2)(d1 / d2) (1)

where

q = volume flow capacity (m3/s, gpm, cfm, ..)

n = wheel velocity - revolution per minute - (rpm)

d = wheel diameter
Head or Pressure

The head or pressure of a centrifugal pump can be expressed like

dp1 / dp2 = (n1 / n2)2 (d1 / d2)2 (2)

where

dp = head or pressure (m, ft, Pa, psi, ..)
Power

The power consumption of a centrifugal pump can be expressed as

P1 / P2 = (n1 / n2)3 (d1 / d2)3 (3)

where

P = power (W, bhp, ..)

Pump for filter press

What kind of pump should be use for feeding filter press?