The investigation of the cracks produced at the inner wall of 1117 pipe sections of composite large concerete pipe piles and examination for pipe wall cores of 11 pieces is introduced, and maln causes for producing cracks in the inner wall of piles & relevant countermeasures are analyzed.

Numerical simulation and the theoretical analysis with field synergy principle were carried out for the heat transfer and flow state in corrugated tubes,and four specifications of corrugated tubes were analyzed to point out the influence of different Reynolds number and geometric sizes of the tubes on their heat transfer.

Simulation solution to three specifications of corrugated tubes has been done using Ansys.

A corrugated tube heat-exchanger tube-sheet design method of corrugated tube by smooth tube of equivalent wall-thickness was introduced,finite element method and electrical-method were used to the design method.

Multi-stage choking & killing system is composed of multi-stage choke manifold and control system(choke control box,process control box,and control software included).

Experimental research of homemade tubular joint on fatigue property;

Fatigue analysis of tubular joints in a Truss Spar platform;

Analysis and calculation of fatigue life of unconventional tubular joints;

It introduces the design of water spray extinguishing systems which installed in liquid warehouse and expound the importance of throttle pipe and its calculation in this paper.