The working project is intended to increase the energy efficiency of the centralized heating system of consumers by reconstructing the heat networks from the boiler house "KMK" in the area from the left "wing" of the pumping station No. 59 (TRP-59) to consumers, which are residential buildings and buildings in blocks 300-302, which are characterized by high rates of heat energy losses and unsatisfactory technical condition. Additional land acquisition is not required. When performing major repairs of old external heat networks, it is planned to: - replace existing pipelines of external heat networks with pipelines pre-insulated with polyurethane foam elements with a conductive steel pipe and an outer shell of polyethylene resistant to atmospheric corrosion (according to DSTU B V.2.5-31:2007); - replacement of existing pipelines of district heating networks using flexible pre-insulated pipes, with a working temperature of the coolant up to 95 ºС and a maximum working pressure of 1.0 MPa - replacement of existing pipelines in thermal chambers and basements using steel pipes, hot-deformed seamless (according to DSTU 8938:2019); - replacement of existing and installation of new shut-off valves in thermal chambers; - thermal insulation of pipelines and valves in thermal chambers; - repair and reconstruction of thermal chambers and construction of drainage wells if necessary; - dismantling and replacement of impassable channels (precast concrete trays); - restoration of road surfaces and sidewalks in places of laying pipelines of external heating networks; - performance of works on landscaping and improvement of the territory of work. Temperature schedule – 95-70⁰С. The maximum design pressure in the heating network is P=1.0 MPa. Consumers connected to the designed network in terms of heat supply reliability belong to the second category. The operation mode of the centralized heating system is seasonal, only for heating needs (without DHW). The surrounding development is represented by a complex of non-residential and residential buildings. The territory under consideration has existing landscaping and landscaping. The relief of the territory under consideration is planned in accordance with the planning of the adjacent territory. The natural and climatic characteristics of the site, which belongs to the II architectural and construction climatic region (according to DSTU N B V.1.1-27:2010 "Protection against dangerous geological processes, harmful operational influences, from fire. Construction climatology"), are characterized by the following data: - the average temperature of the coldest five-day period, with a provision of 0.92 - (minus 21ºС); - annual precipitation from 400mm to 500mm, average - 475mm. The direction of the prevailing winds: - in the summer - eastern; - in the winter - northern. The average wind speed in January is 4.7 m/sec. The climate of the area is temperate. Summer is hot and dry with dry winds, winter with frequent thaws, the average air temperature is 8.5°C, the average temperature of the warmest month is July +22.3°C, the coldest month is January -3.4°C. According to DBN V.1.2-2:2006 "System for ensuring the reliability and safety of construction objects. Loads and impacts. Design standards" the characteristic values of loads and impacts are: - snow load - 1110 Pa; - wind load - 440 Pa; - ice wall thickness - 19mm; - wind load during ice - 260 Pa. As a result of the reconstruction of heat networks, the qualitative indicators of heat supply to consumers will be improved and the following results will be obtained: - minimizing the frequency of damage to heat network pipelines in the area of the left "wing" of pumping station No. 59 and branches to consumers in blocks 300-302 by replacing old pipelines with new ones; - reducing the loss of thermal energy and energy resources by using pre-insulated pipelines; - providing the consumer with uninterrupted and high-quality heat supply services. Currently, the project is being adjusted to make the following changes to the design and estimate documentation: - Replacement of the pipeline material of existing district networks with pipes and fittings made of high-temperature polyethylene PE-RT type II with an external anti-diffusion layer, trademark "PROTERM", with a heat-insulating layer of foamed polyurethane (PPU) and a polyethylene shell, with a working temperature of the coolant up to 95 ºС and a maximum working pressure of 1.0 MPa; - Calculation of pipeline diameters, in accordance with the internal diameter of the "PROTERM" pipes; - Additional construction work that arose during construction according to the contractor's letters

At the moment, the existing section of the heat main consists of uninsulated steel pipelines from DN 50 to DN 150 supply and return. Pipe fittings for connecting branches are located in existing heat chambers (TC). U-shaped compensators are used to compensate for temperature loads. This working project provides for the replacement of pipelines in the section from the insertion into the existing pipeline in the premises of pumping station No. 59 (TRP-59) to the connection of branches to houses and buildings located in blocks 300-302, which includes: - replacement of existing pipelines of external heat networks using pipelines pre-insulated with polyurethane foam elements with a conductive steel pipe and an outer shell of polyethylene resistant to atmospheric corrosion (according to DSTU B V.2.5-31:2007); - replacement of existing pipelines of district heating networks using pipes and fittings made of high-temperature polyethylene PE-RT type II with an external anti-diffusion layer, trademark "PROTERM", with a heat-insulating layer of polyurethane foam (PPU) and a polyethylene shell, with a working temperature of the coolant up to 95 ºС and a maximum working pressure of 1.0 MPa; - replacement of existing pipelines in thermal chambers and basements using steel pipes, hot-deformed seamless (according to DSTU 8938:2019); - replacement of existing and installation of new shut-off valves, compensators in thermal chambers; - thermal insulation of pipelines and valves in thermal chambers and basements; - repair and reconstruction of thermal chambers and construction of drainage wells at the lower points of the route; - dismantling and installation of new impassable channels (precast concrete trays); - restoration of road surface and sidewalks in places of laying pipelines of external heating networks; - execution of works on landscaping and improvement of the territory of work. Connection to the existing heating network was made: - from the cut-in into the existing pipeline in the premises of pumping station No. 59 (28 Vitaliya Matusevycha Street); - for branches from the heat chamber to the inner wall of residential buildings and buildings in the basement; - the design boundary for branches of the designed pipelines that are not included in the reconstruction boundaries is the wall of the heat chamber. - The temperature schedule at the connection points is 95°-70°C, the maximum design pressure in the heating network is P=1.0 MPa. Consumers connected to the designed network belong to the second category in terms of heat supply reliability. The pipelines provided for in this working project are made of: - steel electrowelded pipes ST/PE 219x6/315, 159x6/250 pre-insulated according to the DSTU B V.2.5-31:2007 standard; - polyethylene pipes RE-RT type II pre-heat-insulated pipes with sizes from 63/125 to 125/200 according to the DSTU-N B.V.-2.5-81:2015 standard. - seamless steel hot-deformed pipes according to DSTU 8938: 2019 from steel 20, for diameters from Du 50 to Du 200 mm - in thermal chambers, basements; Connecting parts of pipelines are provided - in thermal chambers according to DSTU 17375: 2003, from steel 20. - in impassable channels according to DSTU B V.2.5-31:2007. Laying of pipelines is provided underground, in existing impassable channels/trays manufactured according to the 3.006.1-2-87 series and without channels. Compensation of temperature deformations of steel pipelines of the heat network is carried out by arranging U-shaped compensators. For compensators, the arrangement of the compensator niche NKK-8 and NKK-7 according to the 4.904-66 series is provided. Arrangement of fixed supports, supports of movable guides and sliding supports in impassable channels is provided using supports for pre-insulated pipelines according to DSTU B V.2.5-31:2007. The pitch of the sliding supports does not exceed 7.0 m. Sliding supports are installed on support cushions according to the 3.006.1-2-87 series. The arrangement of fixed supports in thermal chambers and basements is provided according to the 4.903-10 series, issue 4. Compensation of temperature loads for PE-RT type II pipes, pre-insulated pipes is carried out at the expense of the angles of the route turns and U-shaped compensators. Pipelines are laid on a sand bed 100 mm thick, followed by backfilling with sand to a height of at least 100 mm above the outer shell of the pipes. This method of laying pipes does not require the arrangement of sliding or fixed supports in the tray. The connection of flexible polymer pipes with a steel counterpart in the thermal chamber is provided using PERT/steel transitions - welded and flanged. The arrangement of fixed supports in thermal chambers is provided using clamp supports of the TS series 5.903-13 issue 8-95 and serves to fix the pipeline for which a transition to a flexible polymer pipe is provided. In thermal chambers, pipelines are replaced on branches to consumers along with the replacement of existing pipeline fittings, including jumpers, air vents and drainage pipes. Flanged valves and valves are provided as shut-off valves, and pipeline fittings for air vents and drainage. All pipelines and shut-off valves located in thermal chambers and basements must be thermally insulated with mineral wool basalt insulation 60 mm thick with a coating of foil-coated foamed polyethylene insulation tape. Thermal insulation of pipeline fittings is provided as removable. Structural solutions, see drawing Volume 2 set KTM-25.10 -TM.K. When performing work: 1. The presence and depth of laying existing underground communications should be clarified during the work. Earthworks at intersections should be carried out manually in the presence of a representative of the operating organization. 2. At intersections of heat networks with highways or driveways, lay pipelines by excavating the highway and arranging new impassable channels/cases. 3. In thermal chambers, if necessary, pump out water and clean from debris, with subsequent removal to a landfill. 4. Dismantled trays, floor slabs and dismantled pipelines that are in satisfactory condition should be transferred to KPTM "Kryvorizhteplomerezha". Damaged trays and floor slabs should be disposed of as construction waste. 5. Preliminary and final tests of pipelines should be carried out. The test pressure of the pipelines is 1.25 of the working pressure in accordance with clause 6.3.59 of the “Rules for the technical operation of thermal installations and networks”. 6. Installation, testing and insulation of pipelines shall be carried out in accordance with DBN A.3.2-2-2009 “System of occupational safety standards. Occupational safety and industrial safety in construction”, “Rules for the safe operation of thermomechanical equipment of power plants and thermal networks”, “Rules for the technical operation of thermal installations and networks”. Before starting work, it is necessary to: - open an order for the execution of earthworks; - disconnect all consumers from the thermal network; - coordinate the location of the work with all authorities. All existing water supply, sewage and gas pipeline networks that cross the thermal network (when it is laid underground) above the thermal network pipelines are arranged in cases 3 m long on both sides from the edge of the channel building structure. At the intersections of heat networks with gas pipelines at a distance of no more than 15 m on both sides of the gas pipeline, control tubes are provided on the heat network channel for sampling gas leaks. The project does not allow the discharge of water from pipelines at the lowest points of water heat networks directly into heat chambers. Water should be discharged from each pipe separately into drainage wells. From the drainage wells, pump directly into a tanker truck with subsequent removal by a specialized company according to the concluded contracts.