vent and drain connections
vent and drain connections
(OP)
If I want to use a threaded cap on the outlet of each vent/drain valve pipe nipple then I guess I have to account for the threading allowance. Using 1" pipe, it seems that I will have to use Sch 160 even in low pressure applications in order to meet the required minimum wall considering the thd allowance of 0.07".
Could I consider using a vent/drain valve that is socket welded on the inlet and threaded on the outlet? I would then just use a threaded plug in the outlet and forget about the pipe nipple at the valve outlet. This would simplify my pipe spec and allow me to specify either sch 40 or 80 small bore pipe as long as I do not thread it.
How does this sound?
thanks
Mark
Could I consider using a vent/drain valve that is socket welded on the inlet and threaded on the outlet? I would then just use a threaded plug in the outlet and forget about the pipe nipple at the valve outlet. This would simplify my pipe spec and allow me to specify either sch 40 or 80 small bore pipe as long as I do not thread it.
How does this sound?
thanks
Mark





RE: vent and drain connections
I have seen it done on many projects in various materials.
Go for it!
RE: vent and drain connections
You do not say what size your drain valve is. The way I read it, the 1" pipe is the one you want to tap into. With pipes this small it would be better to install an equal tee and then weld your threaded socket to the branch of the tee, unless you are using 1/2" drain valves.
Harvey
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: vent and drain connections
I will try to be diplomatic with this. Your answer indicates to me that you do not have the training, experience or the basic knowledge of piping. I suggest that you find someone who does know piping and have them explain the details involved with the original question.
RE: vent and drain connections
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: vent and drain connections
so, is this option viable? What kind of premium do I pay for a given valve with these different end preps over one that has a socket on both ends?
Of course, all this is based on the assumption that the outlet of a single valve arrangement for a vent or drain must meet the design conditions of the process pipe when calculating the required minimum thickness. I do not imagine that this pipe is 'exempt' from the code requirements.
thanks to all
mark
RE: vent and drain connections
Harvey
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: vent and drain connections
IF NOT, I HAVE USED THE SW x THR'D END VALVES WITH GREAT SUCCESS
RE: vent and drain connections
I'd say the simple approach for you is to use a 1" SOL with a 1" socket x thread extended body valve with a threaded plug. No pipe nipples to deal with at all.
jt
RE: vent and drain connections
You can buy valves that have a sw male connection by a threaded female end as stymiedpipe said. You can put the sw male end directly into your sol. Then install a plug into the female end.
They are often used for pressure instrument connections.
I will warn you now though that they are not cheap.
One thing that I have seen done in the past but be warned your specification may not allow this (this was in low pressure water service). You can only do this with 3-pieve valves. Buy half the valves you need sw x sw, and buy half the valves you need threaded x threaded.
Since you are supposed to take the valve apart when making the sw connection inorder to not ruin the valve, you can now combine the two and get a much cheaper sw x threaded valve. Not sure if this is kosher or not, but like I said I saw it done.
Zuccus