Chemical Engineering and Materials Science Syracuse University. Piping and Pumping. Process Design CEN 574 Spring 2004. Outline. Pipe routing Optimum pipe diameter Pressure drop through piping Piping costs Pump types and characteristics Pump curves NPSH and cavitation
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At the end of this section, you should be able to…
The optimum pipe diameter gives the least total cost for annual pumping power and fixed costs. As D , fixed costs , but pumping power costs .
Velocity guidelines and Nomograph.
Select standard size, nominal 3 in. pipe.
-Convert gpm to cfm 13.4 cfm.
-Find cfm on left axis.
-Find density (62 lb/ft3) on right axis.
-Draw a line between points.
-Read optimum diameter from middle axis.
Sum K = 19.5
P = (/144)(Z+[v22-v12]/2g+hLsum)
P = ( /144)(150+0+12.9)= 70.1 psi due mostly to elevation. Use P to size pump.
elevation velocity friction and fittings
400 gpm water
4 in pipe
Use charts from Peters and Timmerhaus.
Fittings (T, elbow, etc.)
simple and cheap
uniform pressure, without shock or pulsation
direct coupling to motor
discharge line may be closed
can handle liquid with large amounts of solids
no close metal-to-metal fits
no valves involved in pump operation
maintenance costs are lower
cannot be operated at high discharge pressures
must be primed
maximum efficiency holds for a narrow range of operating conditions
cannot handle viscous fluids efficientlyCentrifugal Pumps
For a given pump
NPSHactual= Pinlet-P* (vapor pressure)
Pinlet = P(top of tank, atmospheric) + gh - 2fLeqV2/D