In order to reduce energy loss of oil gathering and transferring system in production process, study heat transfer laws of oil-gas-water three phase flow, and develope petroleum multiphase flow in China, This paper studies on temperature limit and energy saving technology of circular gathering and transferring process in oil field.

It was found that there exists a critical temperature for the SCC in this system.

According to the meteorological data over the periods of 1961-2004 from the 96 weather stations in Hunan Province,Analyses the effect of main crop as ripe,cotton and Cole by the change of average temperature and critical temperature.

Based on the data of critical temperature (0oC, 10oC) over the Tibetan Plateau from 1971 to 2000, we established the small grid reckon model and calculated the critical temperature values of 500 m × 500 m grid node by GIS.

The limit values of concrete relative depth of limiting compression zone in common prestressed concrete beams and slabs were given with the variation of effective prestress level σpe,which provides basis for rationally considering the effect of effective prestress level of prestressed reinforcement to normal section bearing capacity of common bonded prestressed concrete beams and slabs.

According to the fact that the limits of relatively high coefficient on compression zone is not explained in the computing of ultimate bearing capacity by enlarging sectional areas in tensile region,the paper has pre-sented the factors which influence the limits of relatively high coefficient of the tensile region reinforced by en-larging sectional areas.