Single-acting pumps

Capacity actual, for single acting pumps, single cylinder... 

For double acting pumps, single cylinder Q = (two times value for single acting) — 0.0204 d t,... 

The single-action pump is usually available with three, five and even seven pistons. The odd number of pistons allows the pump to be rotationally balanced, and the use of at least three pistons reduces the discharge pulsation of these single-acting pumps. A three piston pump single-action pump is called a triplex pump. A five piston, or seven piston single-acting pump is called a multiplex pump. 

Figure 3-51. Pressure-time curves for single-acting and double-acting pumps (one piston) [21].

A single-acting reciprocating pump has a cylinder diameter of 110 mm and a stroke of 230 mm. The suction line is fi m long and 50 mm in diameter and the level of the water in the suction tank is 3 m below the cylinder... 

A single-acting reciprocating pump has a cylinder diameter of 115 mm and a stroke of 230 mm. The suction line is 6 m long and 50 mm in diameter, and the level of the water in the suction tank is 3 m below the cylinder of the pump. What is the maximum speed at which the pump can run without an air vessel if separation is not to occur in the suction line The piston undergoes approximately simple harmonic motion. Atmospheric pressure is equivalent to a head of 10.4 m of water and separation occurs at a pressure corresponding to a head of 1,22 in of water. 

SINGLE - ACTING RECIPROCATING PISTON PUMP --[fixed speed - AD2U S ABL E S1LR0KE L E GT h]... 

He perhaps saw the elevation of new continents by subterranean heat, and the lowering of the older continents by atmospheric agencies, as in some way analogous to the rise and fall of the piston in one ofWatt s early single-acting pumping engines.37... 

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