The paper analyzes the masor cause and damage of railway freight car periodic inspection overdue production and backlog,introduces the major counter measures and effects,and proposes some suggestions.

Discussion on Several Problems of the Periodic Inspection Rules of Pressure Vessels;

Periodic inspection on the in-service pressure vessels in air separation unit

The periodic inspection of three long trailer seamless pressure vessels was performed by using conventional methods and acoustic mission testing.

The contents and methods as well as matters needed attention about periodical inspection of hyperbaric oxygen chamber which is different from pressure vessel have been introduced.

According to inspection experience, connecting with related rules and standards, periodical inspection content and items of cryogenic & adiabatic storage vessel are analyzed, inspection project is established and some periodical inspection questions lacking of idiographic standards about cryogenic & adiabatic storage vessel are solved.

In fact,the upper limit deformation rate of residual volume 10% was meaningless in practical periodical inspection.

Performing periodic inspection to improve the management level of hydropower stations in Xinjiang;

It introduces the constitution and function of TIG welding machine,relates the attention items about the equipment,preparation and operation of TIG welding machine,analyzes the relationship of welding current,diameter of nozzle and flow capacity of air current,and introduces the maintenance,periodic inspection and breakdown diagnosis method of TIG welding machine in detail.

A maintenance policy of combining periodic inspection and preventive replacement is suggested.

Brief introduction to regular inspection on industrial pipeline in the metallurgical sector

By analyzing the importance of regular inspection of boilers, some measures to minimize blast / leakage of “four-piping” of boilers are proposed.