| abstract |
A method of forming a gas-tight metal-composite interface at a boss for compressed gas systems has metal and composite portions of a compressed gas system with respective flanges 701,710. The flanges are pressed against one another using a collar 14 or other clamping device. The collar may comprise at least two part-annular, generally C-shaped in cross section segments having proximal and distal damping arms. The flanges and clamping arms may be chamfered so that pressing the arms against the flanges results into compression of ends of the metal and composite portions which form the gas-tight metal-composite interface. The collar may be secured by welding, or by using threaded connections. Such gas-tight metal-composite interfaces are particularly suitable to marine CNG applications. |