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APPENDIX c
Air &
Multipurpose
General Purpose
Heavy Duty
Push-on
Chemical
Transfer
Cleaning
Equipment
Food
Transfer
Washdown
Marine
Material
Handling
Abrasives
Bulk Transfer
Cement & Concrete
Mining
Petroleum
Aircraft Fueling
Dispensing
Dock
Transfer
Spray
Steam
Vacuum
Veyance
Water
Discharge
Suction &
Discharge
Washdown
Welding
Coupling
Systems
APPENDIX
325
GENERAL INFORMATION
PRECAUTIONS FOR WELDING HOSE USE
FOREWORD
:
This bulletin is issued to alert dealers and users of welding hose that special hose may be necessary for
use with certain fuel gases.
SCOPE:
This bulletin relates to welding hose manufactured in conformance to RMA/CGA specification or to welding
hose conforming to individual manufacturer or user specifications.
CAUTION:
The fuel gases listed below are recorded to alert welding hose users to a potential hazard with these or
similar gases. It should be noted that no condemnation of any of the gases listed is intended. The purpose
is to advise against the use of hose that may not be designed for a particular gas or pressure. A user of any
fuel gas is urged to relate the type of gas along with the expected working pressure (regulator setting) to the
hose manufacturer for a specific hose recommendation.
ALERT LISTING:
These and similar fuel gases may damage some grades or types of welding hose:
APACHI, FLAMEX, MAPP, PROPANE, PROPYLENE.
Use of the indicated or similar fuel gases at regulator settings above 40 psi may be particularly hazardous.
Users are also alerted against the use of ACETYLENE at any pressure above 15 psi.
IN-SERVICE CAUTION:
The user is first cautioned to shut off the gas at the torch and then at the regulator or supply source when the torch will not be used
for periods in excess of 30 minutes, in order to limit permeation of gas through the hose wall.
The user is further cautioned not to shut off the fuel gas at the regulator or supply source first as a flashback may result and
thereby damage the hose.
Adequate ventilation must be provided in confined areas where fuel gas is being used to prevent the accumulation or concentration
of gas that could be explosive or otherwise harmful to personnel.
Warning:
THE USE OF CERTAIN FUEL GASES MAY DAMAGE WELDING HOSE AND
LEAD TO FIRES AND EXPLOSIONS.