The article presents a series of practical approaches to hydraulic computation of condensate in fan coil and horizontal main pipe, which are based on the research of exhaustion of condensate that occurs in the air conditioning system characterized by fresh air fan coil.

The project of sewage main pipes in north bank of the Xiaoqing River is a subsidiary engineering of sewage collection system of Jinan City.

Through introduction of spiral inner winding pipe technology application in Yuya road sewage main pipe maintenance and reforming engineering of Sanya city,the technical principle and implementing process of spiral inner winding pipe technology were illustrated,many advantages of the technology were generalized at the same time,so as to further popularization and application.

Computational method of designing storm water pipes of unattached drainage areas;