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Old 28-08-2015, 10:07   #1
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Pulsation dampener for engine driven watermaker

I was wondering if anyone that has pulsation dampener on their engine driven RO would share their make and model.

1/2" NPT diaphragm ones are are gigantic and pricey. I tried the crappy ashcroft 1106 but two of them were leaking.

I am at a point where if I increase the flow vibrations are substantial.
I have Cat 290 on a 7" clutch driven by 5" crankshaft pulley (Westerbeake 40)
I have two SW30-2540 in parallel.
brine flow is anywhere from 1.75(bad) to 2.25(decent) gpm depending on my engine RPM. Interestingly I have a 3/4" scoop strainer for watermaker intake and If i make water while under way, i can get away with more brine flow before vibrations become noticeably bad.

I feel like high pressure hoses will be prone to damage at these types of vibrations and pulsation dampener might help.
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Old 29-08-2015, 00:12   #2
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Re: Pulsation dampener for engine driven watermaker

It sounds like your pump is doing all the work, taking in 0 psi water and making high membrane pressure. Usually there are 2 pumps. One low pressure and one high. The pressure pump is more efficient that way. Probably why underway the vibration is better. Unless you have a pressure gauge, you may be running your membrane at low pressure.
I have a salt water pressure system (for wash down, etc.) that supplies about 40 psi water to the water maker pressure pump. No dampeners, etc.
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Old 30-08-2015, 07:52   #3
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Re: Pulsation dampener for engine driven watermaker

thanks, ill try to increase feedpump pressure. I keep it about 5-10psi. I have a new Flojet 4305 pump. The last one I had was overheating. It was also a flojet. Thats why i try to keep the pressure low.
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