Best rpm for plunger pumps?

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barts
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Re: Best rpm for plunger pumps?

Post by barts » Wed Nov 10, 2021 3:31 am

Steam Captain wrote:
Tue Nov 09, 2021 11:28 pm
I renew Cyberbadger's question 50% for his and 50% for my own curiosity.
I'll try and look at the one in Rainbow tomorrow.

- Bart
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Bart Smaalders http://smaalders.net/barts Menlo Park, CA
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barts
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Posts: 980
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Boat Name: Otter, Rainbow
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Re: Best rpm for plunger pumps?

Post by barts » Thu Nov 11, 2021 1:13 am

So I looked at the Hypro pump on Rainbow (Otter is ~1000 miles south right now) and it's a 5300 series w/ (I think) rubber cups. I've used various displacements (1.5-> 3 gpm) and both rubber and teflon cups. They have all worked reasonable well, but as noted elsewhere are susceptible to problems w/ debris in the check valves. Good fine intake strainers are a must. They should also be mounted with the output port facing upwards to help clear air.

I was at the Columbia River Museum in Astoria, Oregon last week and took some pictures of the pumps on an 75 hp Atlas Imperial diesel engine; I find this sort of pump easy to understand and repair while underway. A simple rocker arm driving a plunger pump with easily opened/rebuilt commercial check valves.
PXL_20211105_235952000.jpg
PXL_20211105_235952000.jpg (110.06 KiB) Viewed 377 times
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Bart Smaalders http://smaalders.net/barts Menlo Park, CA
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