Page 212 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

184 Applied Process Design for Chemical and Petrochemical Plants

- _-------
ua
0
-
Atmospheric -0 0
P
Pressure
V .-
I
4-
4- c Suction Discharge IL c
a
GO
Liquid Head Head a2 Suction: hs=S-hsL
I
W Y h,,=Pipe, Fittings and
I c other Friction Losses
0
u
YI
;3 Discharge: hd 'D*hdL
hdL:Pipe,Fittings and
other Friction Losses
fTRs

Liquid
*Suction: h, = -SL - hFL.
hSL = Pipe, Fitting, Valves,
ExchanQer and
Si other Friction
Losses
Entrance Loss -hs = SL+ hSL
**Discharge: hd = D + hdL
hdL = Pipe, Fittings and
other Friction
Losses
*Suction: Worst Case = SIL (Substitute in
above)
**Discharge: (Worst Case) use (D + D3
Figure 3-39. Suction lift system

Static Head Pressure Head

For Figure 3-40C
This is the overall height to which the liquid must be
raised. Discharge pressure head = 100 psig
Suction pressure head = 0 psig
For Figure 3-40A Total pressure head = 100 - (+O) = 100 psig
= 100(2.31)* = 231 ft of
water
Discharge static head: H
Suction static head: L (actually -L) Note: The totals are differentials and neither gauge
nor absolute values.
Total system static head: H + L; "Applies to water only. For the other fluids use appro-
actually H - (-L) (3-4) priate specific gravity conversion.

For Figure 3-400
For Figure 3-4OB
Discharge pressure head = 100 psig
Discharge static head: H (from centerline of pump) Suction pressure head = t50 psig (=64.'7 psia)
Total pressure head = 100 - (+50) = 50 psi
Suction static head: S, (actually +S)
not gauge or absolute =
Total system static head: H - S; or H- (+S) (3-5) 50 (2.31) = 115.5 ft ofwater