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� Hose information is subject to change. For full details, visit our website or contact Customer Service. WELDING HOSE TECHNICAL INFORMATION PRECAUTIONS IN THE USE OF WELDING HOSE WARNING: The use of certain fuel gases may damage welding hose and lead to fires and explosions. FOREWORD: In recent years, there have been developed or adopted a number of fuel gases based on specific hydrocarbons or This bulletin is issued to alert dealers and users of welding mixtures of hydrocarbons. It is known that these special fuel hose that special hose may be necessary for use with gases have a different effect on rubber compounds than certain fuel gases. does acetylene. The precise effect on all the many and varying hose compounds and constructions of the many SCOPE: manufacturers has not been determined for all the known This bulletin relates to welding hose manufactured in special fuel gases. conformance to RMA/CGA specification or to welding hose conforming to individual manufacturer or user specifications. The effect of any material being conveyed in a hose on the rubber compounds used in the hose can be measured by CAUTION: one or several test procedures. In the case of fuel gases, the test procedures most applicable would be designed to The fuel gases listed below are recorded to alert welding measure a change of the physical properties after exposure hose users to a potential hazard with these or similar gases. to the fuel gas including tensile, elongation, hardness It should be noted that no condemnation of any of the gases and volume. 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 characteristic of rubber hose that is significant in its use A user of any fuel gas is urged to relate the type of gas along as welding hose is a phenomenon known as permeation. with the expected working pressure (regulator setting) to the Any gas confined in the bore of a hose exhibits a tendency hose manufacturer for a specific hose recommendation. to pass through the tube wall and subsequently through the reinforcement and cover to the environment. Each gas has ALERT LISTING: its own specific characteristic tendency to permeate. Each These and similar fuel gases may damage some grades or rubber compound exhibits specific resistance to permeation. types of welding hose: The rate of permeation increases with higher temperature. To minimize the permeation of fuel gas through the hose APACHE, FLAMEX, MAPP, PROPANE, PROPYLENE. wall it is logical to design the tube compound for the lowest Use of the indicated or similar fuel gases at regulator settings possible permeation rate. The problem in the case of welding above 40 psi may be particularly hazardous. hose results from the variety of gases now encountered, the varying pressures used in service, and the varying Users are also alerted against the use of ACETYLENE at temperatures to be found in the work place. The need to any pressure above 15 psi. ventilate the work place is evident, both for maintaining the lowest practical temperature and to dissipate the IN-SERVICE CAUTION: permeating gas, however slight, to prevent buildup to The user is first cautioned to shut off the gas at the torch concentrations that are either explosive or dangerous for and then at the regulator or supply source when the torch breathing by workmen. will not be used for periods in excess of 30 minutes, in order Some rubber compounds are known to have low permeation to limit permeation of gas through the hose wall. rates with several fuel gases but no specific rule can be The user is further cautioned not to shut off the fuel gas at laid down to predict overall performance. Thus, it becomes the regulator or supply source first as a flashback may result advisable to check the characteristic of each hose construc- and thereby damage the hose. tion with each gas under actual or simulated service conditions to qualify it for use. Adequate ventilation must be provided in confined areas where fuel gas is being used to prevent the accumulation or CAUTION: concentration of gas that could be explosive or otherwise harmful to personnel. Users of welding hose are urged to communicate their service conditions to the hose manufacturer and obtain the best recommendation of the manufacturer for a hose BACKGROUND INFORMATION: REFERENCETECHNICALREFERENCETECHNICAL suitable for those conditions. The RMA/CGA specification for welding hose, as originally promulgated, considered welding hose that would be used * Reprinted with permission from the Rubber Manufacturers Association (RMA) Hose Handbook, RMA/IP-2/2003. to convey the then common fuel gas, acetylene, at the recommended low pressure (15 psi). Several grades were described, the variance between grades relating to a difference in their resistance to deterioration in the presence of oil, or to their resistance to destruction by flame, or both. No differentiation was made for a variance in performance resulting from exposure to the fuel gas itself. It had been determined that actylene, when conveyed under the low pressures common to its recommended use, had little effect on hose, regardless of its composition or construction. 117
Goodyear Rubber Products
