I have a question regarding how you guys would control this. Outside pump house with aboveground tank, 500,000 gal. Three diesel drive fire pumps in parallel from 10" tank supply to 10" yard supply. All three pumps are rated at 2500 GPM but different pressure ratings. I have no design information right now but it's a record storage facility, 50' high piles of paper, fwiw. I'm looking at replacing one of the pumps, the oldest and original, I'll call it pump #1. Pump #1, original 1971 is a 10x8 rated for 2500@125 PSI. Pump #2 was replaced in 2003, same model 10x8, nice tier 2, 2500@125. Check. Pump #3 was replaced in 1994, same model 10x8, but 2000@65. Huh? Jockeys are dual vertical turbine, 100@140. Check. If I work under the premise of direct replacement and quote a 2500@125, tier 3 or 4, how would you guys balance these pumps for lead to lag with a pump so small compared to the rest? Pump #2 becomes the lead pump and #1 and #3 fall in 10# each behind? TD
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