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If I'm pumping 280 GPM water in 4" dia. stl. pipe with an ANSI horizontal process pump, and I don't have the pump selected yet, I have to specify the TDH between the 4" inlet and outlet. Let's say the pump vendor recommends a 3 x 2 pump, They rate it's performance based on the 3" inlet and 2" outlet. I think the pump performance has to include an allowance added for the 4 x 3 inlet reducer and 2 x 4 outlet increaser. I'm having a hard time convincing the vendors to do this. For example, in my case I calculate 130 ft. TDH between a 4" inlet and outlet. TDH between a 3" inlet and 2" outlet is 150 ft. Since I can't predict the pump size combinations between different pump vendors it seems they should have these factors programmed into there selection programs for connection to the customer pipe sizes. I would think this situation has occurred before with someone else. Can someone else please comment on this situation?
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