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post #1 of 18 Old 01-04-2014 Thread Starter
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bottom pressure wash

Pressure washing the bottom in-water. Any info on an wantxextension to do this?

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post #2 of 18 Old 01-04-2014
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Re: bottom pressure wash

Hope you have hard bottom paint, because if you have ablative, ANY in water cleaning is fineable up to $10K. Seem to recall a potential incarceration penalty too.....but could have a foggy brain on the latter.........

Might be simpler to make an appt here in Edmonds for an hour, have the PW the boat, change zincs etc and relaunch and hr later........besides, its legal!

Otherwise, I would suggest a diver with a soft cloth/rag unless you have some really hard shell fish, ie barnacles/mussels etc.

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post #3 of 18 Old 01-04-2014 Thread Starter
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Re: bottom pressure wash

FYI
Wash. Dept of Ecology allows in water bottom cleaning for "hard" bottom paints. The details on what it considers to be "hard" is on thier website: Hull Cleaning and Boat Washing | Clean Green Boating | Washington State Department of Ecology
Some marinas, maybe Edmonds, apply restrictions beyond what DoE requires.

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Re: bottom pressure wash

Edmonds does restrict more than DOE, not that it stops us from cleaning the bottoms with in the marina. POE does not allow ANY bottom cleaning in the marina, hard or ablative.

The state on the other hand, does as you and i stated, allow it for hard paints. That is why I was hoping you have a hard paint. If not......that could get fun.......Even if you have hard paint, I would still talk to a diver with a soft cloth. That seems to work best.

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post #5 of 18 Old 01-04-2014
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Re: bottom pressure wash

Several years ago someone in the marina tried using a power washer on the waterline and I immediately saw the ablative paint start washing away. Definitely not recommended.
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post #6 of 18 Old 01-04-2014
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Re: bottom pressure wash

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Originally Posted by Waltthesalt View Post
Pressure washing the bottom in-water. Any info on an wantxextension to do this?
You will likely ruin your anti fouling paint if you attempt this, whether you have hard or ablative paint. Pressure washers should never be used to clean painted surfaces underwater. The reason is that in order to overcome the ambient pressure of the water surrounding the hull, you will have to have the wand tip extremely close to the surface being cleaned. At the distance we are talking about, the pressure of the water being emmitted from the wand is very high and uncontrollable. You will blast the paint off your hull.
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Re: bottom pressure wash

What distance did you have in mind? I was thinking that a depth of up to three feet pressure was about 16 psi.

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Re: bottom pressure wash

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What distance did you have in mind? I was thinking that a depth of up to three feet pressure was about 16 psi.
I think you will find the pressure washer is pretty much ineffective at any safe distance underwater. Again, you will have to get the wand tip right up on the surface of the hull before it will remove fouling growth. A distance so close that you will be unable to keep from removing paint as well.

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post #9 of 18 Old 01-05-2014 Thread Starter
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Re: bottom pressure wash

Right. Assuming the pressure washer is operated with a tip to give 800 to 1200 PSI it appears that a washer submerged with 16 psi of sea back pressure isn't significantly different than operating a washer out of water with no back pressure. For house paint you pick a the nozzle tip to avoid removing paint from too high a pressure. Seems like that would be the same underwater with a hard paint.

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post #10 of 18 Old 01-05-2014
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Re: bottom pressure wash

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Originally Posted by Waltthesalt View Post
What distance did you have in mind? I was thinking that a depth of up to three feet pressure was about 16 psi.
If this worked the pros would use it, don't you think? There are few things more tiring than hand cleaning a hull in scuba gear.

Also, at 3 feet depth the added pressure is only 1.3 psig, so I suppose you're getting 16 from that plus the atmosphere? I think it's the medium that's the issue (spraying in water vs air) that's the problem, not the absolute pressure.
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