Pump Size Calculations

For preliminary work, you might use a pipe velocity of 3 m/s (10 ft/s) for the pump discharge. The pump suction will typically be one pipe size larger. If you have catalogs ffrom one or more pump manufacturers that would be commonly used in your locale, this will give you some pump dimensions. A commonly seen requirement is for the suction inlet to have a straight section of length 6 x diameter. Add suction valve, possible strainer, possible discharge check valve, discharge valve, and other accessories needed. Add servicing/working clearances as appropriate. This will give you a total "footprint" for the pump. These numbers may be revised somewhat as you pin down an actual pump selection, but this should be a reasonable starting point.

It will help in deciding space requirement for pump piping, but first we need to calculate the pump dimentions so that we could calculate the space requiremnt for locating the pumps in our layouts.

Please throw some light on it.

That was the third sentence in the earlier post (#1).

Once you have estimated the pump flow and head requirements, make a tentative selection from virtually any pump catalog. Use those dimensions for a start. You (or some other specifier) must decide whether to use a close-coupled pump (motor mounted directly to pump) versus a frame-mounted unit (either with direct-drive coupling or belt drive). There are advantages and disadvantages for each of these choices; the close-coupled version takes up the least space.