The sealing and returning system in Song Dynasty changed to be different from Tang Dynasty, the Secretary sealing and returning the order came to be much more chiefly than "geishizhong" sealing and returning.

Influences of different samples on the examination results of tensile strength of polymerizer head;

Study on thickness calculation for hem pyramidal heads;

Finite Element Analysis of the Stress of the Offset Nozzles on the Head of a Liquid Tank;

Reliability analysis of the connecting zone of cylinder and vessel head of high pressure vessels;

The manufacture was required considerable technology, especial the vessel heads.

On the basis of the elasto-plastic finite element method, ANSYS software is applied in order to simulate spinning deformation of the vessel head with large size and thin wall thickness.

Study on a new style head plate equipment;

Qualification licence and forcible supervision inspection regulations were enforced by the law and code of China for the first time on head plate manufacture of special equipments such as pressure vessels etc.

Formed heads for steel pressure vessels is the first complete and unite standard about head plate.

Buckling analysis on rear dome of solid rocket motor case;

Development on Dome Reinforcement of Composite Case;

In addition, special care should be taken to the dome insulation, and the replacement with high grade material.