Product Manual

3-11
CAUTION
ALWAYS clear hoses in well-ventilated areas away from any
flames or other sources of ignition. The escaping gases create
conditions for fires and explosions.
3. Clear the fuel hose in the same manner.
NOTE
There are three types of fuel hoses. Grade “R” and “RM” for
acetylene use only and Grade “T” for all fuel gases (including
acetylene). The hose grade is marked on the hose.
NOTE
Industrial gas hose used in the U.S. is generally color-coded
for gas service identification. The oxygen hose is normally
green and the fuel hose is red. The colors are subject to
change in countries other than the U.S.
WARNING
DO NOT use grade “R” or “RM” hose with LP type gases. Only
use grade “T” hose.
3.04 REVERSE FLOW CHECK VALVES
WARNING
We strongly recommend the use of reverse flow check valves
on the torch or regulator. This will reduce the possibility of
mixing gases in the hoses and regulators. Combustible gases
can explode in the hoses, regulators or cylinders, resulting in
serious injury to the operator. Test reverse flow check valves
at least every six months, and more often if you frequently
disconnect the hoses from the torch or regulators.
Torches equipped with built-in reverse flow check valves help reduce
the possibility of mixing gases in the hoses and regulators.