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Go Back   SailNet Community > Boat Builders Row > CS Yachts > Air vent for water tank on cs30
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Thread: Air vent for water tank on cs30 Reply to Thread
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Topic Review (Newest First)
10-15-2014 09:24 PM
albrazzi
Re: Air vent for water tank on cs30

No screen, will come up with a plan for the whole system as I prioritize, I noticed it while working on the head plumbing and didn't know what it was at the time.

I just picked up my Boat in Deale at Herrington North, Beautiful place.
CS30 "Cashed Out" on the hard for a while but everything is coming to life well thanks to the care of her PO.
10-15-2014 05:56 PM
pdqaltair
Re: Air vent for water tank on cs30

Quote:
Originally Posted by albrazzi View Post
... I also spotted the water tank vent on my Boat and would like to come up with a better solution plus this could introduce water into an already too small bilge.
I'm shooting for dry under the floor boards but that might prove to be difficult.
a. I saw a guy sink his boat with in interior vent; he left the hose running and got distracted. It was a small boat. Still, it seems like poor design. Running it into the sink obviously solves that.

b. Is there a screen in the vent hose? Anything to keep bugs from crawling into the tank? This is required (16 mesh) by the plumbing code for water storage tanks.
10-15-2014 05:03 PM
albrazzi
Re: Air vent for water tank on cs30

Yea, the PO told me it was to tell the Thermostat is open, so its both that and the equivalent of the vented loop. Was there ever a loop on the rear engine cover outside in the quarter berth ??, my cooling hose goes from the seacock to the trans (as a cooler I guess) then to the water pump. I can clean that area up if what I have is an acceptable way to do the vented loop.

I see you have a CS30 as well, how is your head vented??, mine has what looks original from manufacture a loop in between the seacock and the pump suction which is by all practice the wrong place, and instead of a vent (that wouldn't work anyway) there is a bleed screw that stays closed, you cant even get to it without removing the cabinet behind the head.

Thanks for your help..AL

PS, I have owned this boat for about three weeks, not new to Sailing but to this Boat anyway.
10-15-2014 03:08 PM
Oaksail
Re: Air vent for water tank on cs30

Quote:
Originally Posted by albrazzi View Post
This thread has already answered two questions for me, but I am curious about the Anti-siphon line from the thermostat, there looks like there was a traditional vented loop (now removed) on the rear outside if the engine compartment. The hose is looped in that area presumably where the Vented loop was at one time. Were different methods employed when new. The Volvo manual doesn't mention the line to the thermostat. Any thoughts ?

I also spotted the water tank vent on my Boat and would like to come up with a better solution plus this could introduce water into an already too small bilge.
I'm shooting for dry under the floor boards but that might prove to be difficult.
The small hose off the top of the thermostat housing is routed to a vent on the port side of the hull just below the toerail just forward of the genoa winch.
10-15-2014 12:10 AM
albrazzi
Re: Air vent for water tank on cs30

This thread has already answered two questions for me, but I am curious about the Anti-siphon line from the thermostat, there looks like there was a traditional vented loop (now removed) on the rear outside if the engine compartment. The hose is looped in that area presumably where the Vented loop was at one time. Were different methods employed when new. The Volvo manual doesn't mention the line to the thermostat. Any thoughts ?

I also spotted the water tank vent on my Boat and would like to come up with a better solution plus this could introduce water into an already too small bilge.
I'm shooting for dry under the floor boards but that might prove to be difficult.
10-22-2013 10:07 PM
Alex W
Re: Air vent for water tank on cs30

Quote:
Originally Posted by jimrafford View Post
The hand pump is not the vent. The vent at the sink is a metal tube. They also in the last couple years of production have a deck fill that the vent is in the side of the threaded fill pipe.
Is that deck fill available aftermarket?

My Pearson has the vent going to the forepeak. That works okay until you try to get every last drop of water into the water tank, then the vent overflows and makes a puddle under the V-berth. This deck fill sounds like it would solve my problem gracefully.

I do see a Perko combination unit meant for gas, but not one meant for water.

thanks,
alex
10-22-2013 11:12 AM
chamonix
Re: Air vent for water tank on cs30

sorry Oaksail, Haven't checked this thread for a while. I'll check on all you say next time I'm at the boat.
09-15-2013 08:52 PM
Oaksail
Re: Air vent for water tank on cs30

On the 30 the tank vent runs up behind the cabinet in the head. It runs as high as the underside of the deck and then loops downward for 5 to 6 inches. if you overfill the tank it will dribble into the bilge. If you remove the cabinet you can see it quite easily, you also gain access to the tank fill tube. It is the perfect spot to install a vented loop for the head.
The midship vent on the port side is a CS make shift anti-siphon line. The other end of the line is connected at the engine thermostat housing. You will find at high engine revs you will see and feel hot water dribbling out of the vent.
08-12-2013 11:53 AM
chamonix
Re: Air vent for water tank on cs30

Also checked the three air vent holes on the hull near the deck. As mentioned there are three, one port bow, one port midship at the cockpit locker and fuel tank, and one at the center of the stern. Know for sure that the port bow is the vent for the holding tank. Saw the line for the port midship heading for the fuel tank and assumed it was the vent for the fuel tank. That left the stern vent. Was kind of hoping that was for the water tank. Only one thing to do, empty the cockpit locker again, and jam my lardy ass to the stern of the boat. Surprise, that vent turns out to be for the fuel tank, which runs a considerable way aft. So what about the vent at port midship? Whats that for? Traced that vent line, It runs underneath the fuel tank and joins two other lines passing through a hole at the bottom of cockpit locker near the engine.
Down to the access hatch in the aft berth. Yup, there's the three lines coming through the hole. Can't tell which line is which though, but they all lead to the engine. Two are obviously fuel lines. The third ( what is, I assume, the line leading to the vent hole ) runs to a box like structure at the top rear of the engine that looks like a fuse box. So what is this line and what does it do? No idea at this point. Possible some kind of vacuum line? The box it goes to looks like a fuse box not a vacuum valve. Another mystery.
08-12-2013 11:28 AM
chamonix
Re: Air vent for water tank on cs30

Well, I was at the boat for a week and had a chance to look into the water tank air vent situation, I'll just put down what I found for future reference. Checked the water tank. Problem is that you can't see or even feel the whole tank, so it's possible that there's a line I can't see. What lines I could see I could account for and none where a vent line. Galley area, again no lines I could not account for. Only line going to the hand pump is of the main cold water line. Didn't check the plumbing at he head, ( forgot Mainesail mentioning the head ) but checked all lines running from the tank to the head area and no vent line. Bit of a mystery here. the only clue I seem to have is that I fill the tank until I can see water coming up the fill pipe ( only way to be sure the tank is full ). When I do water runs out the hand pump for a couple of minutes. It's possible that the over pressure runs back down the main cold water line to vent out the hand pump which has a pressure relief valve to let the air/water through. Unlikely, and weak at best, but it's all I've got right now.
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