Abstract
Distances from the insulation shell of pipelines duringchannelless laying to utility networks are recommended by regulatory documents, but in real conditions it is not always possible to comply with these parameters. Calculations have been made to verify that the gas pipeline can be laid next to the supply pipeline of the heating network in the problematic section of the installation where these restrictions are not met. The soil temperature on the wall of the gas pipeline case is determined to exclude the heating condition of polyethylene pipes above 40 °C for the entire period of operation. Soil temperatures at the intersection of the heating line and the gas pipeline were determined taking into account the real operating conditions of the district heating networks, the peculiarities of regulating the coolant parameters of the Russian heat systems and the state of thermal insulation.
Highlights
According to SP 42-103-2003 «Design and construction of polyethylene gas pipelines and renovation of underground gas pipelines» at the intersection or parallel laying of the polyethylene gas pipeline with the heat path of the underground gasket, the distance between them is specified by calculation based on the conditions for excluding the possibility of heating polyethylene pipes above 40 °C for the entire period of operation
The dependence of specific heat loss of the main pipes pre-insulated with polyurethane foam on coolant temperature in the range of 70-150 ° С is given in the work [3]
Most works on insulation of pipelines consider the tasks of reduction of heat losses during transportation [4,5,6,7], the effect of insulation thickness on cost parameters and corresponding savings in the heat supply system [5, 8], reduction of air pollution and real savingsof carbon emissions [9,10], impact on the environment of flue gases,the impact on the environment from the use of district heat supply systems [11]and district heating systems [12,13,14,15,16]
Summary
According to SP 42-103-2003 «Design and construction of polyethylene gas pipelines and renovation of underground gas pipelines» at the intersection or parallel laying of the polyethylene gas pipeline with the heat path of the underground gasket, the distance between them is specified by calculation based on the conditions for excluding the possibility of heating polyethylene pipes above 40 °C for the entire period of operation.Pipes in polyurethane foam insulation are a monolithic structure that includes: a steel pipe, a thermal insulation layer made of polyurethane and a protective shell. The dependence of specific heat loss of the main pipes pre-insulated with polyurethane foam on coolant temperature in the range of 70-150 ° С is given in the work [3]. Most works on insulation of pipelines consider the tasks of reduction of heat losses during transportation [4,5,6,7], the effect of insulation thickness on cost parameters and corresponding savings in the heat supply system [5, 8], reduction of air pollution and real savingsof carbon emissions [9,10], impact on the environment of flue gases,the impact on the environment from the use of district heat supply systems [11]and district heating systems [12,13,14,15,16]. Thermal insulation materials as a tool for energy saving are considered in the work [20]
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