GMNA - GM6130M
Fuel and Oil Resistant Coupled Hose Assembly Braid Reinforced - Polytetrafluoroethylene
|Publication Date:||1 May 2018|
This specification covers coupled hose for use with gasoline, oil, and diesel fuel and related evaporative systems. These hose assemblies, Type I and Type II, are suitable for use at temperatures of -40 to +230°C and operating pressures to 1.75 MPa. If no type is specified on drawing, it shall be assumed to be Type I. All testing parameters shall apply to both Type I and Type II unless specified.
1. Type I: Stainless Steel Reinforcement
2. Type II: Glass Fiber Reinforcement.
The hose shall consist of an inner tube of virgin polytetrafluoroethyl
Inner Tube. The inner tube shall be a black, conductive smoothbore seamless tube of polytetrafluoroethyl
Wire Braid Reinforcement. The reinforcement shall consist of 0.20 to 0.40 mm diameter AISI Type 302 or Type 304 stainless steel wire applied with a weaving construction of two over and two under such that a minimum 90% coverage is achieved. 184.108.40.206.4 Quick Connectors. Quick connectors used in Fuel and Oil Resistant Coupled Hose Assemblies released to the GM6130M specification shall meet the requirements of GM9060P.
The hose shall consist of an inner tube of virgin PTFE reinforced with electrical grade continuous filament glass fibers and aramid fibers.
The inner tube shall be black, conductive smoothbore seamless tube of PTFE resin conforming to the requirements of virgin Type I Grade 4 Class B resin per ASTM D4895.
Fiber Reinforcement. The reinforcement shall consist of 90% electrical grade continuous filament glass fibers blended with 10% aramid fibers having minimum 9,000 yarn denier for 5/16 inch nominal inside diameter hose, 14,000 yarn denier for 3/8 inch nominal inside diameter hose, and 14,000 for 1/2 inch hose bonded to the tube by means of a Teflon coating with a weaving construction of two over and two under such that a minimum 90% coverage is achieved. Coating pigment shall be black. No glues or adhesives are permissible. 1.1.2 Coupling Construction.
The coupling shall be designed, inserted, and swaged or crimped so that no internal. PTFE tube abrasions, cuts, or flaws shall result under any condition or combination of assembly component dimensioning or tolerancing allowed by supplier production specifications or under any condition of tube compression allowed by supplier production specification.
Sharp corners shall be avoided where the coupling contacts the tube to prevent cutting of the hose when subjected to internal pressure.
Tube Insert. The end of the tube insert must be radiused to eliminate burrs or sharp edges which might cause PTFE tube damage under conditions of assembly vibration or pressure impulse.
Damage. Damage to PTFE tube or reinforcement generated by the crimping of the tube is not permissible under any possible production manufacturing conditions or supplier production tolerance stack-up, including variations in tube compression concentricity.
Tube Collapse. Metal tube insert collapse during crimping is not permissible, except when this collapse is limited, predictable, controllable, and does not increase the potential for assembly leakage or other malfunction.
Grooves, upsets, or serrations are not permitted on the tube stem OD, or on the crimp shell ID, except that these grooves, upsets, or serrations do not cause PTFE tube cutting or other damage under any condition or combination of assembly component dimensioning or tolerancing allowed by supplier production specifications, or under any condition of PTFE tube hose compression allowed by supplier production specifications.