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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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944 Drilling and Well Completions<br />

d<br />

I<br />

t<br />

Flgure 4-255. Typical positive pulse valve design.<br />

where Q = flowrate in ft3/s<br />

A = flow area in ft2<br />

C = flow factor (C = 1.0)<br />

dP = pressure loss in psi<br />

y = fluid specific weight in lb/fts<br />

g, = 32.18 ft/s2<br />

Trace the curve representing dP versus the puppet valve displacement<br />

for the 500-gal/min flowrate.

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