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Old 11-02-2016, 06:10   #1
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Anyone have 3-4 bar water pressure on their boat?

I just wondered if anyone has this level of water pressure on their boat, maybe for washdown?
If you have this, I would be interested in knowing your setup.
Thanks John
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Old 11-02-2016, 06:33   #2
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Re: Anyone have 3-4 bar water pressure on their boat?

Unless I misunderstand this is roughly 45 to 60 PSI?
If so I believe it's pretty common?


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Old 11-02-2016, 06:54   #3
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Re: Anyone have 3-4 bar water pressure on their boat?

Our seawater washdown is 3.5 bar, our potable water for the domestic taps is 3 bar.
And it's not an unusual pressure at all.


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Old 11-02-2016, 06:59   #4
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Re: Anyone have 3-4 bar water pressure on their boat?

I was curious and looked on Defender and found fresh water pumps up to 70 PSI.
I think mine is about 60, which is real close to 4 Bar I think?


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Old 11-02-2016, 07:11   #5
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Re: Anyone have 3-4 bar water pressure on their boat?

Quote:
Originally Posted by a64pilot View Post
I was curious and looked on Defender and found fresh water pumps up to 70 PSI.
I think mine is about 60, which is real close to 4 Bar I think?


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60 psi = 4.08 bar


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Old 11-02-2016, 07:19   #6
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Re: Anyone have 3-4 bar water pressure on their boat?

4 bar is alot of water pressure to have coming out of your sink tap.
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Old 11-02-2016, 09:35   #7
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Re: Anyone have 3-4 bar water pressure on their boat?

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4 bar is alot of water pressure to have coming out of your sink tap.

I don't think so, I think it is actually average output pressure for a pump. I believe the idea is to try to duplicate the house water pressure. Flow rate of course really has a lot to do with it, a smallish pumps pressure will drop drastically with not much flow.


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Old 11-02-2016, 10:03   #8
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Re: Anyone have 3-4 bar water pressure on their boat?

Yes, the pressure is quite a bit lower when water is flowing. Remember these are automatic pumps, the start when the pressure drops because a faucet has been opened, and they shut off when the faucet is closed, and pressure rises to the setting of the (usually internal) pressure switch.

Pumps are sized by expected demand. If it's only supplying a single galley faucet, a pump of about 1.5 to 2 gpm (~ 5.5 - 7.5 lpm) is sufficient, and they typically have pressure switches set around 25-30 psi (~2 bar). Systems that have to supply multiple faucets and a shower or two are typically 4 - 6 gpm (15 - 20 lpm), and the design pressure has to be higher to assure flow and pressure is maintained when more than one faucet is open at a time, thus 50 - 60 psi, 3 - 4 bar.
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Old 11-02-2016, 10:07   #9
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Re: Anyone have 3-4 bar water pressure on their boat?

Forgot to mention, if you know your pump make and model number, you can look up the pressure switch setting.
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Old 11-02-2016, 10:46   #10
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Re: Anyone have 3-4 bar water pressure on their boat?

Just a note of caution for the long distance crowd. Anything over 20 psi can quickly drain tanks if a connection gets loose or a pipe breaks. 20 psi is low enough to make a noise in enough time to stop the system, yet enough flow to do basic rinsing of dishes, hands, etc. 60 psi will give you household pressure flow but can empty tanks quickly. When we left the boat for a day or more, we turned off the water system to be on the safe side. Remember Murphy never sleeps.
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Old 11-02-2016, 11:15   #11
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Re: Anyone have 3-4 bar water pressure on their boat?

We have two jabsco parmax pumps, one for the fresh water system and one for raw water. I think they are 5 or 6gpm -- either way I believe their pressure switches are 4.3bar.

For better or worse, unless the Yanmar is running, one can hear when the pumps turn on; as such, I believe I would soon know if there were a leak. Sometimes when I hear the pump turn on intermittently I will check and see that someone left the aft deck shower on or some such thing.

What would you like to know about the setup? It is pretty simple -- on the fresh water side there are two valves controlling which freshwater tank it pulls from. There is then a T. One side of the T runs through a charcoal filter (or maybe the filter is after the pump?), and then to a strainer and then the pump. From the output of the pump it runs to many places, including the hot water heater, the sink and shower in each head (x3), the galley sink, on-deck shower, ice-maker, washer-dryer, dishwasher, to the flush port on the water maker, and maybe a few I've forgotten. The washdown setup is even simpler -- coming from the fresh water tank T, above, there is a check valve and a ball valve and then a T. Coming into the other side of this T is a hose from a seachest/strainer and a ball valve. The third leg of the T goes through a strainer to the input to the deck washdown pump. I use a freshwater system pump because Xylem said I could and I had an extra one as a spare when the previous pump died. From the output of the pump there is a T and hoses to two deck fittings. There are ball valves below deck near each fitting.

I generally keep the valves set to salt-water washdown (as opposed to fresh).
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Old 11-02-2016, 11:27   #12
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Re: Anyone have 3-4 bar water pressure on their boat?

I'm running a Headhunter Mach 5 pump at 65 psi and 20 gpm .
I started a thread on my setup , just search for " Headhunter "

Regards


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