Numerical simulation of thermal parameter of hot oil pipeline during coating overhauling period

Key words:  hot oil pipeline  coating overhauling  dig and backfill  finite volume method  numerical simulation

Abstract:

By simplifying the project schedule and operation condition of the hot oil pipeline during the period of the coating overhauling, a mathematical model of hot oil pipeline for the station space including exposed section was developed. The finite volume method was used in the discretization of the model. In this way，the oil and soil temperature changes along the pipeline during the coating overhauling period in different ambient temperature, operation parameter and different stage can be simulated. And the maximum permitted dig section length of a station space can be determined by the calculated result. Using the program，the operation condition of Huludao-Suizhong station space of Tieqin oil pipeline during the coating overhauling period in year 2006 was simulated. The results demonstrate that the average calculation error of inlet temperature is below 1.0^. Considering the dig section1 s soak by the rainwater or not considering, the maximum permitted dig section length is not exceeding 1,0 km and 6.0 km in July respectively.