Pressure vessel with safety features
A vessel, such as a rocket motor tube, comprised of an insert, and a joint that allows the insert to decouple from the vessel to relieve pressure when subjected to excessive temperatures and/or a predetermined temperature or temperature range.
1. A vessel, comprising:
a body defining an internal cavity;
a cylindrical insert to close and seal a cylindrical opening in the body, the insert and opening having coaxial longitudinal axes; and
a joint material forming a joint between the body and the insert, the joint material creating a conditionally secure attachment,
wherein at least one of the body and the insert has formed on a surface thereof one or more circumferential annular rings and one or more grooves that are parallel to the longitudinal axes and intersect the one or more annular rings, the rings and grooves collectively defining a void between the body and the insert, the joint material being disposed within the void,
wherein the joint material is selected so as to be injectable into and set within the void and so that it softens when exposed to a predetermined temperature, and
wherein the joint permits the insert to become displaced from the body by pressure within the internal cavity when the predetermined temperature is exceeded, thereby allowing contents of the vessel to escape in a controlled manner and the pressure to be reduced.
2. The vessel of claim 1 , wherein at least a portion of the one or more annular rings is formed on an interior surface of the body.
3. The vessel of claim 1 , wherein at least a portion of the one or more annular rings is formed on an exterior surface of the insert.
4. The vessel of claim 1 , wherein the body and insert each have one or more circumferential annular rings formed on a surface thereof, and wherein each of the one or more rings on the body is aligned with a corresponding one of the one or more rings on the insert.
5. The vessel of claim 1 , wherein the joint material comprises a polymer having a reduced mechanical strength when exposed to the predetermined temperature.
6. The vessel of claim 1 , wherein the joint material comprises a high density polymer reinforced with glass fiber.
7. The vessel of claim 1 wherein a temperature-sensitive material is disposed within the cavity.
8. The vessel of claim 1 wherein the one or more circumferential annular rings is a plurality of rings and the one or more grooves intersect each of the plurality of rings to provide a fluid path between the rings.
9. The vessel of claim 1 wherein the body comprises one or more injection ports in communication with the one or more cylindrical annular rings, the one or more injection ports being configured to allow injection of the joint material into the void between the body and the insert.