Need 7" Bushing

joyjoyjoy

Hi can't find a 7"MPT to 4"FPT ROUND Bushing for a 7" pipe on an 1896 radiator system that they don't make anymore. Even a piece of 7" threaded pipe would save the day -anybody happen to have this or know who might? Thanks SO much!!

WMno57

https://en.wikipedia.org/wiki/Nominal_Pipe_Size#NPS_4_to_NPS_9
Wow, apparently a Nominal Pipe Size of both 7 and 9, are standards. I have no idea where you would find something like this. Just to be clear, NPS 7 has an outside diameter of 7.625 inches. Must be a large system.

WMno57

Probably faster and cheaper to pay a mobile weldor to come out anD replace part of the piping.

ScottSecor

I do not recall ever working with 7" steel pipe. That being said, you may be able to weld a more standard 6" or 8" steel pipe to adapt to the old piping. We have done this a few times with 3-1/2" steel pipe.

retiredguy

I don't where you are located or how soon you need that fitting but I would call a company like B M Kramer in Pittsburgh, Pa and ask them. Their phone # is 412-481-3000 or 800-822-1333. If anyone would have it or know where you could get one it would be them. I haven't seen 7" pipe in about 45 years.

EdTheHeaterMan

Weld a custom made flange on the 7" pipe then weld a matching flange to the pipe size you want to transition to. You can use smaller wrenches on the flange bolts.

Pumpguy

Try a machine shop, especially one that does oil field work. A really good machinist shouldn't have any problem making the threaded flanges or bushings you need.

Mad Dog_2

Quentzel in Bed Stuy Brooklyn. If anyone has it ....They got it  718.455.6602  ask for Andrew   mad dog

EBEBRATT-Ed

Cheapest way out is to weld a piece of plate to the 7" pipe. Cut a hole in it to match the 4". If it's low pressure this will fly. Don't think you can buy 7" pipe anymore and I know no one makes 7" fittings anymore.

Mad Dog_2

I remember coming across 3 1/2"    mad dog

lager

Dan's Article in PM Engineer this month about Nominal Pipe sizes, he admitted seeing 7" pipe once

lager

joyjoyjoy

Good Luck finding the 7" x 4" reducers, I think the machine shop is the best idea, for what it's worth

JohnNY

Mad Dog_2 said:

Quentzel in Bed Stuy Brooklyn. If anyone has it ....They got it  718.455.6602  ask for Andrew   mad dog

This is where I get my 3-½" pipe and fittings.

mattmia2

lager said:

joyjoyjoy

Good Luck finding the 7" x 4" reducers, I think the machine shop is the best idea, for what it's worth

welders tend to be cheaper than a piece of steel big enough to turn a 7" fitting out of

JUGHNE

I think that ED had the simplest/cleanest idea.

Just weld a flange on the end of the pipe. Something that would have clearances for the bolts.

The inside diameter of the flange only has to be at least 4"....not full size.

Than a matching flange that would take your 4" pipe.

EBEBRATT-Ed

I only saw 7" once. Don't think you can buy any fitting or pipe in 7". 3 1/2 I only saw once on an old boiler. Last I knew you could buy 3 1/2 " pipe but not fittings, unless someone has old stuff hanging around.

The geared threaders like the Ridgid 141 or Toledo 41E could cut 3 1/2" threads.

Kickstand55

If its steam, be sure not to trap any condensate. If you do, run a condensate line to a return somewhere so as not to disrupt normal condensate flow, or where you could bang your head or trip someone, or introduce it to live steam. If you do, it will let you know what went wrong.
Best to consult someone well versed in the industry.

WMno57

www.detroitnippleworks.com
They will thread 7 inch pipe. Don't know if they have 7 inch pipe in stock. If not they may be able to get it. They also do custom fabrication, so they could make a bushing. As it says on their website, give them a call.