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Old 04-24-2017, 09:39 AM
Mike185 Mike185 is offline
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Piggy back - cracked tank / vacuum issues

I've read about people having issues cracking hard tanks with piggy backed bags due to a vacuum created by the collapsed bags blocking the vent line when draining.

Is this a real concern?

Has anyone tried putting something in the bag (maybe some extra smaller diameter hose, plastic balls or something else to keep the bag from sticking together and creating a blocked vent???
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Old 04-24-2017, 10:07 AM
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CruisinGA CruisinGA is online now
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Quote:
Originally Posted by Mike185 View Post
I've read about people having issues cracking hard tanks with piggy backed bags due to a vacuum created by the collapsed bags blocking the vent line when draining.

Is this a real concern?

Has anyone tried putting something in the bag (maybe some extra smaller diameter hose, plastic balls or something else to keep the bag from sticking together and creating a blocked vent???
Just install a tee with check valve venting to atmosphere between tank and bag.
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Old 04-24-2017, 08:21 PM
Skyskiguy Skyskiguy is offline
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Originally Posted by CruisinGA View Post
Just install a tee with check valve venting to atmosphere between tank and bag.
This is how MC now vents the tanks.
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Old 04-25-2017, 04:41 AM
Mike185 Mike185 is offline
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Makes sense, thanks! Funny the wakemakers and waterski kits do not include these....
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Old 04-25-2017, 09:36 AM
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bet_on_black bet_on_black is offline
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So the check valve on the tee lets air into the tank but doesn't allow water to come out?
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Old 04-25-2017, 09:48 AM
flyguy570 flyguy570 is offline
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On the new piggy back systems do they have a hose from the check valve to a thru-hull port, or are they just letting it pull air from inside the hull? I'm considering adding this so that I don't cracks tank but don't want to drill a hole through the side of my boat. I might be inclined to put the check valve high inside with no vent to outside of the hull and hope the check valve doesn't leak.
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Old 04-25-2017, 11:33 AM
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Originally Posted by bet_on_black View Post
So the check valve on the tee lets air into the tank but doesn't allow water to come out?
That's the idea.
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Old 04-25-2017, 11:34 AM
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Quote:
Originally Posted by flyguy570 View Post
On the new piggy back systems do they have a hose from the check valve to a thru-hull port, or are they just letting it pull air from inside the hull? I'm considering adding this so that I don't cracks tank but don't want to drill a hole through the side of my boat. I might be inclined to put the check valve high inside with no vent to outside of the hull and hope the check valve doesn't leak.
I can't speak for the new systems but I know that I wouldn't add a through hull, no reason too. For example, your engine draws a much large volume of air from within the boat.
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Old 04-25-2017, 11:54 AM
flyguy570 flyguy570 is offline
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Originally Posted by CruisinGA View Post
I can't speak for the new systems but I know that I wouldn't add a through hull, no reason too. For example, your engine draws a much large volume of air from within the boat.
Yeah I wasn't worried about air volume. I was more just curious if the new ones had it. I'm more concerned with the check valve failing and ending up with water filling my bilge. Again if I were to do it I'd put the check valve up high so in the event of a failure it would leak a smaller about of water. In reality the valve itself could be low if just need a hose got by up higher the the top of the fat sack when it's full.
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Old 04-25-2017, 11:55 AM
Skyskiguy Skyskiguy is offline
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Quote:
Originally Posted by flyguy570 View Post
On the new piggy back systems do they have a hose from the check valve to a thru-hull port, or are they just letting it pull air from inside the hull? I'm considering adding this so that I don't cracks tank but don't want to drill a hole through the side of my boat. I might be inclined to put the check valve high inside with no vent to outside of the hull and hope the check valve doesn't leak.
Yes, they use a 1/2 lb., spring type check valve right off the top of the tank with a hose to a thru hull fitting. The reason for the thru hull is that if the check valve were to fail you wouldn't fill your bilge with ballast water.

Last edited by Skyskiguy; 04-25-2017 at 10:26 PM.
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