Fuel hose

<div class="htmlview paragraph">The need to meet today's stringent environmental legislation requires that all fuel system components, including flexible rubber hoses, have exceptional permeation resistance to standard and oxygenated fuels.</div> <div class="htmlview paragraph">To help meet this need, new ultra low permeation laminates that retain the flexibility of rubber fuel hose have been developed. These laminates are made up of a fuel contact layer of fluoroelastomer (FKM), a permeation barrier of very thin (0.05 mm) fluorinated ethylene propylene (FEP) plastic film and a conventional elastomeric backing layer. Adhesion between the layers exceeds the tear strength of the elastomers.</div> <div class="htmlview paragraph">These laminates are useful for making fuel hose that exhibits outstanding permeation resistance while retaining the ease of coupling and the flexibility associated with standard rubber hose.</div>

<div class="htmlview paragraph">Laboratory studies suggest that isolated failures of epichlorohydrin copolymer (ECO) fuel hoses on cars equipped with electronic fuel injection systems were caused by exposure to “sour” (oxidized) gasoline.</div> <div class="htmlview paragraph">Results of an intensive program indicate that epichlorohydrin homopolymer (CO) elastomer is significantly more resistant to the effects of sour gasoline than ECO. The incorporation of a suitable stabilizer further enhances the sour gasoline resistance of CO elastomer and permits successful completion of both six-week static and circulation test procedures.</div>

<div class="section abstract"> <div class="htmlview paragraph">SAE J1942, developed through the cooperative efforts of the U.S. Coast Guard and SAE, became effective August 28, 1991<span class="xref"><sup>1</sup></span>, as the official document for nonmetallic flexible hose assemblies for commercial marine use.</div> <div class="htmlview paragraph">This SAE Standard covers specific requirements for several styles of hose and/or hose assemblies in systems on board commercial vessels inspected and certificated by the U.S. Coast Guard. It is intended that this document establish hose constructions and performance levels that are essential to safe operations in the marine environment. Refer to SAE J1273 for selection, installation, and maintenance of hose and hose assemblies.</div> <div class="htmlview paragraph">Refer to SAE J1527 Marine Fuel Hose for hose to convey gasoline or diesel fuel aboard small craft, including pleasure craft and related small commercial craft regulated directly or by reference under 33 CFR 183 Subpart J, and boats and yachts meeting American Boat and Yacht Council standards.</div> <div class="htmlview paragraph">SAE J1942-1—Qualified Hoses for Marine Applications is a listing of the products which have been certified for use in the applications described in SAE J1942, <span class="xref">Table 1</span>—HOSE APPLICATION / CONSTRUCTION, for Fluid Power, Fuel Oil, Lube Oil, Water, and Pneumatic systems.</div> <div class="htmlview paragraph">SAE J1942-1 is updated yearly and is available from SAE as a single copy document.</div></div>

<div class="htmlview paragraph">The recent history of NBR fuel hose tubes is reviewed, with special emphasis on retention of physical properties after exposure to various test media, including fuel-alcohol blends.</div> <div class="htmlview paragraph">Also studied was the problem of permeability. It was found that one route to dramatically lowering permeabilities is the application of a thin veneer of nylon to an NBR base.</div>