A while back we were discussing the Sealand T series pump as a possible replacement for the original bilge pump and wondering what the flow rate would be. I just installed one of the these pumps and did a test for you. Here are the conditions:
1. Sealand T series pump operating at 13.3 volts.
2. 1 1/2" hose used for the pickup and discharge.
3. Length of pickup hose to pump 7 1/2'
4. Length of discharge hose: 2 1/2'
5. Gentle bends in hose shields corrugated exhaust hose.
6. Discharge is into a 1 1/2" tee fitting for a scupper drain that is above the waterline.
7. Pickup is fitted with a Whale coarse plastic strainer, probably some restriction.
8. Total lift is approx. 6' (if you need a more accurate measurement let me know)
Test procedure: The bilge was pumped down until the T series pump was just starting to suck air. 5 measured gallons of water were added to the bilge and the pump was run until it just began sucking air. Time required: 52 seconds, so it appears that the capacity for this installation is about 345 gph.
Sorry that it took a while to get this data to you.