Heat networks

General Explanatory Note

General part

1.1.The working project "Shifting and Laying of Engineering Communications for Residential Buildings., Developed by CJSC" Inzhproectservice "under an agreement with" JSC TsNIIIEP of Residential and Public Buildings "

1.2. Design solutions are made in accordance with:

- design assignment approved by the customer;

-technical conditions of OJSC "Mosenergo" branch of Thermal networks;

-MIP circuit 006570 8 stage.

1.3. This working project provides for connection to the heating networks of residential buildings on the street. Dybenko, st. 18.korp.2; vl.22 corps.2.3; vl.24; vl.26 corps.1

1.4. The designed heating line passes through the territory of the SAO district and is intended for heat supply to consumers.

Heat network route. Gasket Methods and Types

2.1. The heat network route is designed from heat conductors 2Dy = 200 insulated with polyurethane foam in a factory-made polyethylene shell in a channel-free version, laid on a sandy base, with sand sprinkling. Natural sand GOST 873693 of the first or second class with a size modulus of 33.5 with a filtration coefficient of not less than 5 m/day, the size of granules of not more than 16 mm should not contain large sand particles with sharp edges, which can damage the protective layer of pipelines and couplings. After backfilling, the sand must be tamped. It is important that the heat conductors laid in the sand are provided with uniform friction between the outer shell of the pipeline and the soil .

2.2.Transport and install pipes in SGP of insulation and components at ambient air temperature not lower than 00С.

2.3.The present design provides for the termination of joints of thermal pipelines with welded joints Mosflowlain1000 (MFL JONTEK), the technology of which was developed by Mosflowline and agreed with operating organizations. Before backfilling of the route, it is necessary to draw up an act for closing joints .

2.4. When preheating the heat conductors in the act, it is necessary to indicate the preheating temperature and compression value of the starting compensators after heating .

2.5.For the period of construction of heat pipelines along the existing heat network, the working design provides without bypass.

Compensation of heat conductors

3.1. For general provisions on compensation, see "General instructions to the section of the thermal network."

3.2. In areas where compensation is carried out by the installation of starting compensators, the installation of thermal pipelines should be carried out at a temperature of at least + 100С.

3.3. Prior to preheating, the heat line route shall be filled except for ball cranes (gate valves) on the branches.

3.4. Preliminary heating of heating conduits needs to be made up to the temperature + 700C after installation of ball valves (latches) on branches, at the same time pressure in heating conduits should not exceed 0.4 Rrab.

3.5.After preheating of heat conductors to temperature + 700С, with control of their movements, starting compensators are brewed, insulated and filled.

3.6. Heat conductors heating to temperature + 700С till starting compensators brewing must be not less than a day.

3.7. Welding of the last joint shall be performed not lower than -100C at natural compensation and not lower than + 100C at preliminary heating.

3.8. After the start-up compensators are brewed during operation, the temperature of the heat conductors should not decrease below + 100С (during emptying of the thermal network).

3.9. During preheating of heat pipelines by the construction and operation organization, an act is drawn up, indicating the heating temperature and the average daily outside air temperature, which should be attached to the as-built documentation.

3.10. After the construction is completed during the operation of the heating networks in the sections of the starting compensators installation, branch tie-in is possible only under pressure (i.e. without the release of heating water).

3.11. If it is necessary to perform a tie-in to the existing heat pipeline in the section of starting compensators with the release of heating water, an additional installation of the starting compensator with preheating of the heat pipelines up to 700C is required.

Construction structures

4.1. The heating network construction project provides for the use of prefabricated reinforced concrete products included in the territorial catalog for construction in Moscow, as well as products manufactured by Glavmosinzhstroy plants.

4.2. When designing a channel-less laying of thermal networks with polyurethane foam insulation in a polyethylene shell, the materials of the Loxtor Rohr album were used.

4.3. Volumetric elements and precast reinforced concrete are used for the construction of the chambers (see drawings of the set of HW 1).

Piping Status Monitoring System

5.1. This order is monitored by the LR detector, which is connected to the monitored circuits by the LR terminal. LR detector is taken into account in the design of thermal conduction condition monitoring for this order.

5.1. Before insulation of joints connect wires according to special instructions. In order to monitor the condition of the Dy 200mm thermal pipelines, a monitoring signal system shall be provided.

Geotechnical conditions

6.1. Characteristics of soils opened during trench development are given in the conclusion on engineering and geological conditions.

6.2. In the area between T.1-T.9 in the base of the heating network there will be sands of backfilling of the dismantled channel provided by the design, layer-by-layer compacted to K = 0.98. Under them lie moraine and cover loam sandy and dusty, refractory consistency, with design resistance R0 = 150 kPa (1.5 kgf/cm2). And on the area between the base of the heating network there are bulk, loamy soils with crushed stone of brick and concrete, remnants of wood, moist, of medium compaction, up to 0.5 m in capacity, dusty, refractory loam under cover loams. Design resistance of specified soil thickness R0 = 150 kPa (1, 5 kgf/cm2).

6.3. The underground waters of the main horizon on the construction site lie below the elevations of the heating network and the bottom of the dismantling trench and will not be opened during earthworks.

Water removal

7.1. Water removal from the lower points of the heat network is carried out by discharging drainage water and water from emptying pipes into the existing rain sewer Du = 400 mm.

7.2. Drain and air fittings are installed at points of route, t.3 t.9

Note

All other information on construction structures, compensation for thermal elongations, requirements for quality of steel pipes and their welding, insulation of heat pipelines, washing of the heat network and conditions of construction and commissioning, see "General instructions for the section of the heat network" and drawings of TS.1 sets

Energy efficiency and thermal energy management

8.1. In this working design, a channel-free laying of thermal networks with polyurethane foam insulation in a factory-made polyethylene shell is designed, the advantage of which, over previously used gaskets, is in more efficient saving of at least 20% of thermal energy.

8.2. Thermal insulation of pipelines, turning angles, shutoff valves, joints and start-up compensators comply with the norms and change No. 1 to SNIP 2.04.1488 adopted by Resolution No. 1880 of 31.12.97. R.F. State Committee on Housing and Construction Policy, RD 34.2050195 ,

RD 15334.020507-98.

8.3. Thermal insulation is protected against moisture ingress by a waterproof polyethylene shell and a designed control system.

8.4. The method of laying heat networks adopted by the working design corresponds to item 2.1.21 of the "Operating Rules for Technical Specifications and Equipment for Consumers."

8.5. Due to the absence of pressure gauges for measuring pressure on the designed heating system, during operation during switching and disconnection of thermal pipelines, it is necessary to monitor the hydraulic mode by pressure gauges installed in the chambers.

8.6. Maximum operating pressure in the supply heat line 1.6 MPa

(16 kgf/cm2).

8.7. The pressure test in accordance with SNIP 3.05.0385 "Heat networks" shall be 1.5 of the operating pressure.