Schedule 10 for steam piping?

LarryC

I am helping a neighbor with his 1 pipe steam system. Reading LAOSH, Dan recommends using no smaller than 2" pipe for mains. Currently the neighbor's house is piped with 1 1/4" mains. I have a bunch of 2" steel pipe formerly used in a sprinkler system at work. The pipe is labeled ASTM-A-120 ERW 2" x SCHED 10 x 21 FT

The steam system is running at 1.5 psi cut out and as low as I can get it cut in. Do you folks have any concerns about using this pipe for the mains?

Thanks,

Larry C

Brad White_9

Your local code will dictate

but I certainly would not. Too thin even if it can take 150 psig in a fire protection system, steam is a dynamic system expanding and contracting in cycles.

Many codes dictate wall thickness or reference standards that do.

You are going to build the system once. Why give yourself cause to look back with regret? I would use Sch. 40 and on condensate returns, Sch. 80.


My $0.02

Brad

EBEBRATT-Ed

I agree with Brad. Use #40 for the mains and #40 or #80 for the returns. #80 is sometimes used for the returns because condensate is acidic and the thicker wall will last longer.

I never tried threading #10 it's pretty thin and I would think it would be pretty weak at the joints after threading

Just mho,

Ed

Tombig_5

Sch 10

It might be good for fence posts if it's galvanized. Sch 40 for any low pressure boiler. Haven't seen sch 80 since the welding days. Use the light pipe to support the tomato plants and do the right thing with the boiler. JMEHO

TG

Perry_2

A 120 Schedule 10. Nope. P11 or P22 would be OK

A 120 ERW is pretty junky pipe in the scheam of pipe specs. I would not use Sch 10 for steam service - and would question using it at all in steam service.

Crome Molly alloys, typically referred to as "P11" and "P22" alloys would be great at schedule 10 - and last forever. Of couse - its a lot more expensive than Sch 40 (or 80) A53 Black Iron or A106(or is it A105 - my memory is slipping).

I suggest you stick with the standard steam pipe spec.

Perry

LarryC

Thanks

I was just looking see if I could help the neighbor, but I see the point of doing it once and doing it right.

Schedule 40 it is.

Thanks,

Larry C