SpudFiles

ok so I have some threaded iron pipe fittings -because our drain system is made from iron pipe but most of it has been replaced with pvc- my dad wont miss them if I use it but he says they are just for drain purposes and won't take pressure.

do i have to watch for DWV iron fitting as well when building pneumatics?

whats the wall thickness? is there a seam where it looks like they were folded over eachother? or is it a welded seem? or no seam at all?

Show us some pictures.

well I can't find the cord for my camera

but I'll describe it the coupler that interest me is (what appears to be) a 3" to 2" reducer

there is a ring around each end so it is a little thicker that the actual wall but the 3" threaded end looks like a 3 5/8" OD and a 2 3/4"ID and the 2" end... well it looks like it could be 1.5" but its stuck on a brushing right now so I don't know
the general shape is like this

there is a seam so its probably cast iron

It will work great. Iron of any thicknes over 1/16 can hold lots of pressure.

Wow, a 3x2 reducer must cost a fortune. You should be glad you found one.

Wouldn't happen to have any 3" pipe left from that drain system would you?

Edited: (partially in response to DYI) I kinda doubt it's actually cast iron... "Black iron" just refers to the type of coating they put on the pipe. Almost all "iron" fittings are steel.

If it is cast iron, it probably has a pressure rating of 125 psi. If it is steel, it will probably be 150, but should be able to take more. Cast iron I would be careful with though, it's kind of brittle.

how much 1/2 steel pipe can hold ?

1/2" steel should be pretty safe to use around 800-1000 psi in. So unregulated co2, if that's what you're after.

Make sure it's not the thin walled conduit stuff though.

cast iron sewer pipe is a whole different animal than blan black iron(gas pipe)or even ductile iron water pipe.closer to dwv pvc
it's a little less tough than non pressure reted pvc when it comes to impact.
the usual way to cut it is with snap cutters .

I don't know from your description weather your fitting is drain or pressure ,but I do know that whatever threaded into it was not cast iron drain pipe.
maybe look at the threads to see if they are cast or machined.

threading cast iron pipe or fittings? not apt to happen . then or now
threading anything over 2" raises a whole nuther set of problems in that most threading machines and dies only go up to 2".
you can thread bigger stuff but it cost, and uses a whole different setup.


for what its worth

How old is the pipe?

"Cast iron I would be careful with though, it's kind of brittle."

My husky 36 gallon 135psi 5000 hour air comperssor is cast iron

3 year warrenty,

dosnt iron rust then crack?

Cast iron is iron that is cast in a mold that is made out of high temp sand, that is were the texture comes from. It is still iron and can hold pressure. Tho if it is super rusty or something like that I would not use it.

to answer several questions the fitting is really old and has minor rusting, the body looks like it was casted and the threads were cleanly machined

the threads are in decent condition but it's going to take some elbow grease to get the brushing off the small end

does anyone know about cast iron drain pipe