Dear friends
I need your advice on what diametr of CPVC pipe to use from the kitchen sink, shower and bathroom sink to the gray water tank. Is 1.5-inch enough?
Thanks in advance!
1.5 should be fine. you do not need cpvc,however. Pvc is fine.
Thanks a million!
ABS works best for a RV fwiw
Just remember poo flows down hill. goes for all plumbing. even fresh water if you plan on draining from low point in winter. Good luck Steve. Bob
Clifford is right. ABS (black plastic) is designed for drain lines. It won't let things stick to it as bad, so over time you won't get all the build up.
Above all that, all your local building supply stores will have all ABS p-traps that you will need.
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1.5 ABS here ;)
i use 1 1/2 also, but spa line (pvc) is flexible, very tough. It can be glued just like the other into the connectors. I use it when i want a flexible connection, like between the floor and the tanks in the compartment.
has anyone else done this? it works really well as a flexible joint, and actually could be used for most of the drain lines, but it is hard to keep straight.
i have a 3 inch diameter piece of it between the toilet flange and the black tank, and the 1 1/2 to the grey tanks.
i have also noticed when doing initial experiments on it, that it needs well glued, and the glue has to dry for 24 hrs for a good bond..which has me thinking the plastic is way softer than the normal pvc. i was a bit concerned about this when after making my bonding experiment, that i put 3 short screws in the connetion to hold it in place...
have had absolutely no trouble, and my tanks can move a bit if they have a big vibration..
I also put the rubber connectors which have a band on each end... between each tank run, and one on each side of the sewer hose drop...
Remember that Steve is in Mexico and he can't always get the stuff we take for granted here in the USA. I'm surprised that Mexican plumbing pipe is not metric. My bus was made in Mexico and some plastic pipe used for conduit is metric.
1.5 " seems like over kill to me. I ran 3/4 or 1" and have had no problems. I also made a common trap for all 3, K sink, B sink and shower. Tom
The standard for drain lines in a house is 1 1/2". I see no reason to go smaller in a bus unless you absolutely don't have the space. The extra cost is quite minimal.
up here the standard drain lines for almost everything but commodes are 1.25". You can hardly buy fittings for 1.5" for most stuff, except bathtubs.
Brian
Quote from: bevans6 on May 07, 2012, 06:35:02 AM
up here the standard drain lines for almost everything but commodes are 1.25". You can hardly buy fittings for 1.5" for most stuff, except bathtubs.
The interesting thing is the trap on my kitchen sink is 1 1/4", but it connects to ABS plumbing that is 1.5". My house was built in 2001 to then current plumbing code.
I did some research with Google and it appear that in the USA at least that only a bathroom sink is allowed to have a 1 1/4" drain. Others are supposed to be 1 1/2". Using 1 1/2" plumbing allows more fixtures to share the same line per code. Canada might be completely different.
I too went 1 1/2" ABS on all our drain lines and also on the tank vents.
Billy
FWIW . here in Mass. 2" is actually required for showerstalls. A bit of an overkill it seems. mike
Quote from: mikke60 on May 08, 2012, 03:25:44 AM
FWIW . here in Mass. 2" is actually required for showerstalls. A bit of an overkill it seems. mike
Mike -Not if there are several females (or males) in the house with long hair.
Less risk of a plugged line, especially if it's a concrete slab foundation.
Steve -Metric equivalent, if needed, would be 3.175cm = 1.25", 3.81cm = 1.5", and 5.08cm = 2".
Whatever you do/use, be sure to get the correct glue, makes a big difference. Beware, too, that there are "hot", "medium" and "cold" types, which correspond to how quickly they set up. "Cold" gives you lots of time to work with the glued joint before it sets up, sometimes annoyingly so. "Hot" sets up extremely quickly - better get it right the first time, or you'll be cutting it out to do over. Tip: A "Fine Point" Sharpie is a very handy tool when fitting together plumbing before gluing. Can even be seen on black ABS if work area is well-lit.
Highly recommend, if using ball valves anywhere in your plumbing, to get the models with unions on them - these valves do screw up, and with unions, are easily replaceable. If you can't find them at a plumbing supply, try a swimming pool supply (wholesale, not retail.) Buy spare handles at the same time - those are the first to go!
Also, two "45s" together are much less restrictive than straight or street "els", sweep els are even better. Less restriction = better flow. (
One 2" straight/street elbow = 7' of straight pipe in terms of resistance to flow.)
FWIW & HTH. . .
;)
RJ,the Fernco couplings work better than unions on drains a screw driver and you are there lol they are flexible and a lot cheaper to buy
I agree with luvrbus, Fernco is a good friend for RV drains.
Fernco couplings are for apprentice plumbers. Real men use glue, LOL
Dave5Cs
Quote from: Dave5Cs on May 09, 2012, 08:01:04 PM
Fernco couplings are for apprentice plumbers. Real men use glue, LOL
I don't think anyone is saying to use Fernco couplings exclusively. (At least I hope not.) Using a few of them to make it easy to remove a tank for repair isn't a bad idea. I had to cut my plumbing to remove my tank once. The only time I have used a Fernco coupling is for the drain line on my sump pump at home so I can remove the pump. It drips a little as they aren't designed for pressure.
All seriousness aside, I have actually used them for hooking up sewer lines when the owner didn't want to pay the price to change all the clay line to ABS and we took out a portion of it and the used one between to hook up to ABS and clay pipe. They work well. Also if I were to do the tanks again in the coach I would put on on all the top connections to the tanks just incase I had to remove them. Makes life easy.
Dave5Cs 8) ;D
Clifford (and others) -I understand your comment about using Fernco couplings, but I you missed what I said:
Quote from: RJ on May 09, 2012, 12:16:11 AM
Highly recommend, if using ball valves anywhere in your plumbing, to get the models with unions on them - these valves do screw up, and with unions, are easily replaceable.
Completely different application than what you'd use a Fernco for.
Sorry if I didn't make that clear in my original post.
FWIW & HTH. . .
;)