Not allowed the construction of polyethylene pipelines on undermined territories and peat bogs in the ground subsidence in type ii nsc 05/01/2001 to urban and rural settlements, and rocky soil. In the field with silnopuchinistymi primers allowed the natural gas pipeline below the zone of seasonal freezing of soils. There should not be laying polyethylene lines in bulk and silt soils. In each case the choice of the pipeline is based on detailed engineering and geological surveys. In cities and towns of underground gas pipelines should be laid under dividing strips or roads between the red line and the line of development, as well as within neighborhoods and districts. Pipeline route should be selected according to the minimum length of the network. Of gas pipelines between settlements should be chosen for undeveloped areas, possibly with quiet relief, the shortest path between start and end points and the lowest crossing of natural and artificial barriers.
When choosing the route to avoid crossing areas with landslides, marshes, wetlands and flood areas. The pipeline route should be given to not intended for agricultural land use or the least valuable farmland. When crossing the forest plots track must be laid on areas with less forest cover, or the least valuable species of trees. When choice of route should take into account the possibility of using existing roads for construction and operation, as well as future development areas along the route during the planned operation pipeline. The route should be selected on the basis of optimality compared alternatives, in order to obtain maximum economic benefit. This takes into account the above construction costs, maintenance and repair of the pipeline, material consumption of the system, the cost of measures for environmental protection, compensation for loss of land users through the temporary withdrawal of land out of circulation, etc. Minimum horizontal distance in light of the polyethylene lines to buildings and structures should be taken as for steel pipelines in accordance with the requirements of the nsc to the requirements 03/03/2002 7.13 04/03/2001 nsc. Horizontal distance between a light polyethylene lines and other underground utilities should be taken in accordance with the requirements of the nsc 03/03/2002, 04/02/2007 snip (with Amendment number 1), wpc 600, sep.
Distance from polyethylene lines to outside walls of the wells and chambers of underground facilities must be at least 0,3 m. The minimum vertical distance of the light at the intersection of all the pressures of polyethylene lines with underground utility networks and facilities (except heating systems) should be taken in accordance with the National Security Council 03.04.2001, VSN600, sep. For heating systems, this distance is determined from the non-heating plastic pipes above the temperature set for your brand polyethylene. Polyethylene pipelines should be buried below the heating networks.