Thread Sealant for 2 1/2\" and up?

Booger

I will be running about 10 lengths of 3" black pipe (nat. gas) next week for boilers in an office/warehouse...I was wondering if anyone has recomendations or personal favorites for pipe dope? I have tried Permatex (black messy stuff) and Block (green messy stuff) in the past on the big stuff......

oil-2-4-6-gas

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welder////

oil-2-4-6-gas

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rectorseal #5 --no lampwick

Bruce M.

Rectorseal Number 5

Rectorseal No. 5 pipe thread sealant is a soft-set, slow drying compound which seals, lubricates, and protects threaded pipe and fittings. It is recommended for a wide range of applications including threaded PVC, polyethylene, galvanized steel, iron, copper, brass, aluminum, stainless steel, and fiberglass reinforced pipe. Temperature range of -50 F. to +400 F. Brushable to +20 F. Brush top can. No. 25631: 1/4 pint No. 25551: 1/2 pint

bob young

lampwick not recommended for gas work word on street is that it rots

Dave Bush

I believe that for over 2\",

Rectorseal specifies that their #7 sealant be used.

The #5 is for 2" and below.

I agree with the welder remark. 6010 electrodes on the root pass and 7018 hot passes on top...

Bruce M.

Here is the information about # 7 but # 5 should be used.

http://www.rectorseal.com/productdata/sealantprdcts/dsno7.htm

It is specially formulated for corrosive chemicals. Pipe size is not a factor. Rectorseal # 5 should be used for natural gas not # 7. There is also # 5 Special and # 5 Sub-Zero.

Mike Reavis_2

I second the vote for a welder

You can probably get one for a minimum charge fee and it would probably be what you calculated for labor.

Scott Denny

Thread Sealant for 2 1/2\" and up?

I've started using Super Dope for 2-1/2" and larger sizes. You can find it at:
http://www.argco.com/cgi-bin/item/scan/fi=products/st=db/co=1/sf=category/se=Super-Dope/op=rm/nu=0/ml=50/tf=description/to=x.html

Dale

Standard pressure?

Assume you are 5# or under since you are considering threaded, we use teflon tape ( up from the last 2 threads) and also our standard teflon pipe dope for all our 4" required threads. For higher pressures indoors like 2 - 5 pounds refrigerant "leak lock" works well. However we weld whatever we can as then there's no leaks.