Pressure container with thermoplastic fusible plug

A container for the storage and transportion of pressurized fluids, and having a discharge opening said container having a cylindrical portion and comprising a thermoplastic inner liner which is stable and impervious to the fluid to be contained therein up to a predetermined temperature but is fluid-pervious above said temperature and an outer layer of an insulating fire resistant material encasing the inner liner, characterised in that

• (a) said inner liner is blow-moulded or rotational-moulded and opens into said discharge opening, a portion of said inner liner forming a fusible plug which is fluid-pervious above said temperature and which is exposed to the atmosphere when said discharge opening is closed and said container is subjected to at least said temperature,
• (b) said insulating outer layer is formed on the inner liner in a manner to expose said fusible plug portion, and
• (c) said insulating outer layer comprises at least two sets of glass fibre reinforced fibrous windings substantially covering the surface of the inner liner but without covering said fusible plug so that above said temperature, said fluid can pass through said plug to the atmosphere without passing through said outer layer, said two sets comprising a first axial set wound in planes substantially parallel to or at a slight angle to the axis of the inner liner and a second hoop set wound circumferentially in planes substantially normal to the axis of the inner liner, the second hoop set overlying the first axial set at least along the cylindrical portion of said inner liner.

A container for the storage and transportation of pressurised fluids and having a discharge opening, said container having a cylindrical portion and comprising a thermoplastic inner liner which is stable and impervious to the fluid to be contained therein up to a predetermined temperature but is fluid-pervious above said temperature and an outer layer of an insulating fire resistant material encasing the inner liner, characterised in that

• (a) said inner liner is blow-moulded or rotational-moulded and opens into said discharge opening, a portion of said inner liner forming a fusible plug which is fluid-pervious above said temperature and which is exposed to the atmosphere when said container is subjected to at least said temperature,
• (b) said insulating outer layer is formed on the inner liner in a manner to expose said fusible plug portion, and
• (c) said insulating outer layer comprises at least two sets of fibre reinforced fibrous windings substantially covering the surface of the inner liner but without covering said fusible plug so that above said temperature, said fluid can pass through said plug to the atmosphere without passing through said outer layer, said two sets comprising a first axial set wound in planes substantially parallel to or at a slight angle to the axis of the inner liner and a second hoop set wound circumferentially in planes substantially normal to the axis of the inner liner, the second hoop set overlying the first axial set at least along the cylindrical portion of said inner liner.