PVC Pipe for a holding tank? - Page 3 - SailNet Community
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post #21 of 26 Old 11-10-2010
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Aquarium through fittings - can you please expand on this.

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post #22 of 26 Old 11-10-2010
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Here is my 2 cents on PVC. Based on construction experence, The fittings do not like strain, if they are in a bind they will crack. Pvc swell just slightly when exposed attic temps over 140 degrees. As PVC ages it becomes brittle. Lastly, PVC is can stand no UV light. This applies to all scedules. I have seen air line ran in PVC last 10 years till some bumps them then you have an air leak.
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post #23 of 26 Old 11-10-2010
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Quote:
Originally Posted by YARDPRO View Post
why in the world would you not use white pvc? Pvc is used for municipal water lines all the time? green pipe is used more for drainage and sewer lines.. it is a thinner wall and is more prone to cracking and breaking. there is no difference in smell between the green pipe and others... the green is merely a color used so people can more easily identify the pipe and it's contents in the future... ie. purple pipe for reclaimed non potable water..... same pipe, just a dye used for ID purposed...

Grey conduit is also the same PVC with a dye so it can be identified ad an electrical conduit.

any pvc would work fine, i like the schedule 80 idea as it is stronger. any of the drainage pipe (green, etc) would be a thin wall and more prone to cracking or chafe than the thicker 80, although the volumes would be reduced...
I think just about all Grey PVC has UV stabilizer in it. that is why you can use it for stand pipes and conduit. I cant say Ive seen Grey PVC over 4".
Not sure about the other colors. but I would steer clear of white.
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post #24 of 26 Old 11-11-2010
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Schedule 80 is overkill. Schedule 40 would be fine. I would be more worried about sloshing. You could get an amazing amount of backpressure in a rough sea. This would be magnified by the diameter and the length of the pipe. Think of it like a blowhole.

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post #25 of 26 Old 11-11-2010
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It won't get much UV light in the bilge.
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post #26 of 26 Old 11-11-2010
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Quote:
Originally Posted by jskrypek View Post
Schedule 80 is overkill. Schedule 40 would be fine. I would be more worried about sloshing. You could get an amazing amount of backpressure in a rough sea. This would be magnified by the diameter and the length of the pipe. Think of it like a blowhole.
Surely anyone heading offshore would void their tanks and go to direct pumpout at the first opportunity ? Holding tanks are, after all only for inshore use.

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“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett, Nation

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