Gas Welding Hoses

[Steve-Maine]

Its time to buy new welding hoses as mine are starting to show wear and cracking. I was looking at tractor Supply,s ad for 25 x 3/16. It says they are available in grades T and R. What doesthis mean?? Thanks

 

[Uncle Ernice]

WELDING HOSES
The cylinder regulators and torch are usually connected together by double line rubber hoses. Double line hose is know as type VD. The Oxygen line is green, the fuel line red. Hoses are available in four sizes, 3/16, 1/4, 3/8 and 1/2 inch I.D. There are different grades of double line hose used for Acetylene. They are:
Non-oil resisting rubber cover
RM- carries both a non-oil and flame and oil resisting cover
(for use with all fuel gases & Acetylene) flame and oil resisting cover.
Grades R & RM should be marked for Acetylene only. Grade T should be marked fuel gas. All hoses should be marked as to their service level (light, standard or heavy ). Date of manufacture, maximum working pressure, ( 200 psig ) nominal I.D size and if it meets RMA/CGA IP-90 (Rubber Manufactures Association, Compressed Gas Association ) specifications for rubber welding hose. The fittings on the hoses are marked as to right and left handed threads.
Single line hose come in three grades, L, light duty, S, standard duty and H, heavy duty. And are also limited to a working pressure of 200 psig.

Google is your friend... I hope!

 

[504]

I would be surprised if any retail store had anything in stock but all fuel hose. There is too much liability if some one hooks up the acetylene hose to propane.

 

[Anonymous-0]

If you use a heating tip, you should get 1/4" hose. Dave

 

[Scott Hightower]

If you are cutting with acetylene you can use T or R. If you are using any other gas such as propane you MUST use grade T. The safest bet is to use grade T for all gas lines.

In 25 ft lengths I like 1/4".

Scott
Fab Manager
http://www.welders360.com/