Lance A. Lot
SLASH Member
Plumbing question I wouldn't mind some opinions on. See post #21
http://www.reefcentral.com/forums/showthread.php?t=2554245
http://www.reefcentral.com/forums/showthread.php?t=2554245
Question on my build thread
- Thread starter Lance A. Lot
- Start date
I was going to say the same thing. putting it on the outside allows you to not have a lip on the inside on the tip of the PVC. just another place for junk to build up as well as interrupt water flow.
makeshift101
Member
I read for the bulkheads the outside thread was NOT meant for pvc conenction, and youre suppose to glue pvc on the inside of the bulk head
it can still be done, just not recommended
it can still be done, just not recommended
ebius
Yup!
This is exactly why I love the threaded ones. Think of the headache if those were glue connections and you had the same problem! I also do not glue my drains or return on the inside of the overflow. I could swap out my bulkheads in less than an hour without cutting any pipes.
I agree with what has already been said. Lip on the outside in the direction of flow.
Lance A. Lot
SLASH Member
I was told on the build thread to do it the other way and use the threads on the inside of the bulkhead because the threads on the outside are only for the bulk head nut. Should I ask BRS? I wasn't going to glue these. I was going to use Teflon tape.
:headwally:
Lance A. Lot
SLASH Member
Does anyone have some spare plumbing parts they want to sell specifically:
1.5 inch gate valves
1.5 inch pvc fittings
1.5 inch pvc in red?
1.5 inch gate valves
1.5 inch pvc fittings
1.5 inch pvc in red?
Pife
Active member
He didn't say to use the outside threads....
Lance A. Lot
SLASH Member
Thanks for clearing that up for me. I am easily confused by plumbing issues.
That makes since for the outside being for the nut but why couldn't you put the pvc on the outside? assuming the threads are the same size and pitch i can't see where it would cause any issues. I understand it could mess up the threading, but you have that same risk on the inside.
Just curious, I deal with a lot of house plumbing but bulkheads are still new to me for the most part
Just curious, I deal with a lot of house plumbing but bulkheads are still new to me for the most part
mpgrant77
New member
I would like to clarify my earlier statement. My original reply was more general as it comes to plumbing also. (like ebius mentioned). I concur though that bulkheads are either slip fit or threaded but if they are threaded they are female threaded only (FPT). The external thread on bulkheads are for the nut only. Here is why. Plumbing fittings are typically tapered threads. (Unless you get into o-ring or gasketed straight threads.) Which means the threaded part of the fitting is slightly cone shaped. The outside thread of a bulkhead is for the nut which is a straight thread not tapered. Threading a tapered fitting onto a straight threads makes for a very poor seal because you only get one thread turn that truly contacts. It will almost always leak a little. Although the thread is the same pitch it is not the same type. So a threaded bulkhead is generally a female connection because the outside thread is used for the nut.
NPT National Pipe Thread (tapered)
FPT Female Pipe Thread (interchangeable with NPT)
MPT Male Pipe Thread (interchangeable with NPT)
European
BSPT British standard pipe tapered (R type)
BSPP British standard pipe parallel (G type)
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kegogut
Active member
This. I dont glue my stand pipes in either. It comes in handy when you have fish in the overflow and need to pull the stand pipe to flush them down into the sump.
