Though vapor lock of swing arm and cavitation bubble collapse of pump indicate different objects, they have same physical significance, i.

The vapor lock of light oil swing arm, which is a technical issue to be solved, has been puzzling the people related to oil.

In this article,the analysis on the causes and influence factors of vapor lock of railway swing arm for unloading oil are carried out,and a computational practical example is given.

In the revamp design of Xishan railway loading jetty of PetroChina Dalian Petrochemical Company, the maximum number of hoses and installation of detachable ladder were studied.

The structure and operating principle of hydraulic loading arm of rail tanker are introduced, the common failures and troubleshooting methods of the lift hydraulic cylinder,horizontal centering cylinder,and tanker trailer of loading arm are analyzed.

To realize artesian discharge, there must be a certain height of liquid level, or an adequate level difference between the liquid stored and the outlet of unloading arm.

After analysis on air lock check formula, given are two solutions to air lock problem; (1)make the oil product with large H pass through the peak point of unloading arm by changing unloading sequence; (2) adjust the arm to reduce its distance to tank bottom.

In view of the features of long tube,thin wall,major diameter and high manufacturing precision of the big diameter liquid loading & unloading arms,the processing technology is expounded and the essential process is discussed in detail,this approach benefits the processing of such kind of parts.