1. Line Sizing And Pressure Drop. :-
Step 1.1 Slurry Characteristics.
Cement kiln feed slurry
Mixed behavior of Slurry
Step 1.2 Slurry concentration (Solid content of Slurry)
Step 1.3 Trial pipe size selection
Step 1.4 Calculate critical velocity
Step 1.5 Compare design velocity with critical velocity
(V-Ve) should be 0.3 m/s or more . In the calculations above
(V-Vc) = 0.417 m/s , therefore selected pipe size is satisfactory.
Step 1.6 calculate design friction loss
Step 1.7 Calculate pump dish charge pressure
2. Special considerations
3. Pump for Slurry
3.2 Positive displacement (Plunger/piston type)
3.3 Lock-hopper system
3.4 Surge –log pump
3.5 Diaphragm pumps
3.6 Moyno pump
4.2 If a side stream is drawn and then returned conveniently measured by magnetic flow meters (which are rather expensive).
4.3 Flow rate of slurry can be conveniently measured by magnetic flow meters (which are rather expensive).
4.4 When positive displacement pump is used for slurry transfer pump speed and displacement can be used to calculate slurry flow rate.
4.5 Pressure gauges and other instruments mounted on pipe line are susceptible to damage due to vibrations.
4.6 For measurement of pressure, diaphragm type gauges are recommended these should be provided with back flushing arrangements, connected to pipe line with capillary. Moreover the gauges should be separately supported and not mounted directly on pipe line.
Cowper , T.L. Thompson , E.J. Wasp, chemical Engineering , June28 , 1971, page
74 - 87.