Acceleration head and NPSHA

As discussed in Section II1.2.1.2, for reciprocating pump, an additional head, acceleration head (Ha, in feet), is required for NPSHA calculation. Ha is calculated by following equation. 

L is length of suction line, in ft v is average liquid velocity in pump suction line, in ft/sec C is a constant for different pump configurations and k is a factor related to liquid compressibility. Values of C and k are listed in Table 2. For suction line with different line size, using Eq, (15) to each section separately. Add the acceleration head for each section to obtain the total acceleration head. 

L equals 1S ft, if a pulsation damper is installed at suction piping. [3] 

U far aj implex dcuble acting k - A factor related to the fluid ccrapressibility  

Note 0 mtl vary from the listed vahiee fbr unusual ratios of oonnectinf rod len h to crank rndius ov r 

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