Hydrogen pressure tank including an inner liner with an outer annular flange
A tank for storing a compressed gas, such as hydrogen, that includes a connection assembly to increase seal integrity. The tank includes an inner gas tight liner and an outer support layer that provides the structural integrity. The connection assembly includes a boss positioned within an opening of the support layer. The inner liner includes a neck portion extending through an internal bore of the boss having an outer collar or flange at an outside surface of the boss. A tank valve is bolted to the boss at an outer perimeter of the collar where a portion of the tank valve extends through the neck portion of the liner and into the tank.
1. A high pressure tank assembly for storing compressed hydrogen, said tank assembly comprising:
an outer structural layer defining an opening;
an annular metal boss positioned within the opening and having an internal bore, said boss including an annular groove at an outside face of the boss;
an inner liner layer positioned within the outer structural layer and providing a gas tight environment, said inner liner layer including a neck portion extending through the internal bore of the boss, said neck portion including an outer annular flange positioned within the annular groove of the boss at a location outside of the outer layer, said outer annular flange extends outwardly beyond the boss and the outer layer, said outer layer completely enclosing an outside surface of the boss opposite to the internal bore of the metal boss and the neck portion of the inner liner layer; and
a tank valve mounted to a front face of the boss and extending through the neck portion of the liner.
2. The tank assembly according to claim 1 wherein the boss is a single piece boss.
3. The tank assembly according to claim 1 wherein the boss is a divided boss including a plurality of boss pieces.
4. The tank assembly according to claim 1 further comprising an O-ring positioned between a base portion of the tank valve and the annular flange to provide a sealed environment.
5. The tank assembly according to claim 1 wherein the liner layer is made of a plastic and the outer layer is made of a graphite composite material.