Urban Pump Series (008) - Pumping In Pressure

This clip is part of Episode 4 in our Urban Pump Series. The entire episode can be viewed (multiple clips, written content, resources) for free over at The Roll Steady Network - www.therollsteady.com (Which can also be accessed via the Mighty Networks App on your phone by searching for "Roll Steady")
-- Every month(ish) we plan to release a new Episode in this series.
-- The series is broken up into three parts:
Part 1 - Getting Water
Part 2 - Moving / Optimizing Water
Part 3 - Flowing Water
-- Each Episode is going to look slightly different due to the content we're covering. You'll also notice the Full Episodes are quite a bit more in depth than the previous Pump Series we released on CZcams.
-- Within an individual Episode there could be multiple video clips, audio interviews, and exclusive written content.
-- We will continue to post some of the "Clips" to our social media platforms (CZcams, Facebook, Instagram, etc), however the FULL Episode, like the one you're about to see, will only be available here on The Roll Steady Network - www.therollsteady.com
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DISCLAIMER: Dallas Fire-Rescue does not endorse or necessarily promote these videos. The information herein is my best understanding of the material covered and the subsequent views expressed are my own and not necessarily those DFR. These videos are strictly for educational purposes only. It is critical that you follow your department's MOP/SOP, and talk with your Station Officer (and crew) before implementing anything you see here on The Roll Steady.

[@jont6556]

This is very interesting, I thought when using the series mode, when you gain the extra pressure, you lose volume....so using your example, that 500 gpm would be less gpm but more pressure....I think the exact numbers is it would be 70% of your original gpm...?

[@TheRollSteady]

When you run in series you lose volume only in the sense that you are now limited by the capacity of a single impeller.
You could gain greater volume by “splitting your impellers” (aka Volume/parallel mode), but you sacrifice potential pressure capacity.
Multi-stage pumps are designed to offer efficiency in both pressure and volume needs. It is a give-take relationship though. If you maximize one side of that equation, you’ll sacrifice “potential” on the other side… and vice versa.
Hope that answers your question. If I went down a different path, let me know.

[@TheRollSteady]

If you are referring to 100% capacity @ 150psi, 75% capacity @ 200psi, etc….
This is in reference to your pumps rated capacity from UL, set by the manufacturer during drafting operations. This simply is telling you that as your pressure increases above 150psi that you’re volume capacity is diminishing. I believe it’s something to the effect of 50% capacity at 250psi. This is important, but in the urban environment becomes less important information because you are tied into a pressurized water source (not drafting).