Acts of hidden works heat networks. Delivery of heating networks in operation

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ORDER GOSSTROY RF from 13-12-2000 285 ON THE APPROVAL OF A MODEL INSTRUCTION FOR THE TECHNICAL OPERATION OF THERMAL NETWORKS SYSTEMS ... Actual in 2017

4. ACCEPTANCE AND COMMISSIONING OF THERMAL NETWORKS AND HEAT POINTS

4.1. The connection of new heat-consuming installations and thermal networks of the customer to the heat networks of the heat supplying organization, as well as the increase in the heat load and (or) flow of heat carriers in excess of the previously provided technical conditions, if it requires increasing the heat source and (or) the capacity of the heat network of the heat supply organization or subscriber, must be carried out according to the technical conditions for accession.

4.2. Specifications for one or more possible options  heat supply for newly constructed or reconstructed enterprises, buildings, structures, their lines and individual productions are issued by the heat supply organization at the request of the customer.

In the case of connecting complex objects with different thermal loads, technical conditions can be issued in two stages: preliminary and final.

4.3. In case it is necessary to increase the amounts of heat energy and heat carriers received by this heat supply organization from another heat supply organization, technical conditions  the customer should be coordinated with the increase in the maximum hourly load and the maximum hourly flow of the heat carrier with the heat supply organization from which it receives heat energy.

4.4. When issuing the technical specifications between the heat supply company and the customer, a contract is concluded aimed at fulfilling mutual obligations and containing responsibilities and responsibilities of the parties in terms of the amount and timing of the work on connection of heat-consuming installations.

4.5. Technical conditions must be justified; the scope of work determined by them must comply with normative and technical documents for the construction and operation of heat supply facilities and heat consumption.

4.6. The technical conditions for connection to the subscriber's networks are provided by the heat supply company on the basis of a joint application of the customer and the subscriber taking into account the technical requirements of the subscriber.

4.7. Disagreements arising from technical conditions are regulated by the parties, and if agreement is not reached, they are submitted for consideration by the state energy supervision authority, the relevant service of the local government or a specialized independent organization.

4.8. The fulfillment of the technical conditions developed by the heat supply organization is obligatory for the customers.

In cases where the need arises to deviate from the technical conditions when designing, these deviations must be agreed by the customer with the heat supply organization that issued the technical conditions.

4.9. Technical documentation (projects, technical projects), as well as working drawings of those elements of heat supply systems that belong to the heat supply organization (when reconstructing them) are subject to agreement with the heat supply organization prior to the start of construction (reconstruction). The technical documentation of the facility as a whole is subject to agreement with the state energy inspectorate.

4.10. The heat supply organization shall ensure the connection of the consumer to the heat network within the time period specified in the preliminary contract.

After consideration of the submitted documentation and examination of the power installation by the inspector of state energy supervision, an act of admission to operation is drawn up.

4.31. Permission for connection (connection) of the power plant is issued by the state energy inspection authority in the presence of a contract for heat supply between the consumer and the heat supply organization.

The power installation is connected within 5 days from the date of issue of the permit. After connection, the heat supply organization within 24 hours is obliged to report this to the territorial department of state energy supervision.

For connection of power plants without the permission of the inspector of state energy supervision, the heads of the heat supply and heat consuming organizations are liable in the established order.

4.32. The customer must submit to the acceptance committee the documentation prepared by the working commission in the amount stipulated by the effective SNiP.

4.33. Completed construction of detached buildings and structures, as they are ready, are taken into operation by the working commissions with the subsequent presentation of the acceptance commission that accepts the facility as a whole.

4.34. After complex testing and elimination of identified defects and shortcomings, the acceptance commission draws up an act of acceptance of heat networks and heat points with associated buildings and facilities.

The date of commissioning is the date of signing the certificate by the acceptance committee.

Testing of heat networks. The constructed pipelines of heat networks before putting them into operation are tested for strength and density of water pressure (hydraulic test) or air (pneumatic test).

During the test, the tightness and density of welded seams, pipes, flange joints, fittings and line equipment (stuffing boxes, mud collectors, etc.) are checked. Heat pipe is tested twice: preliminarily and finally.

In the preliminary trial  check the strength and density of welded joints and the walls of the pipeline before installing the armature and line equipment. If the heat conductor is made of pipes with a longitudinal or spiral seam, the test is carried out prior to the device on the thermal insulation pipeline.

If the heat conductor is made of seamless seamless tubes, then during the test it can be isolated, while only welded joints remain open. Before the preliminary test, the heat pipe must not be closed with building structures and covered.

The length of the site in the preliminary test is determined depending on local conditions, the organization of work, the availability of test facilities (hydraulic presses, reciprocating pumps), the timing of construction in certain areas, the capacity of the source of water to fill the heat pipeline, the availability of filling facilities, terrain, etc.

In the final test, the construction of a heating duct  must be fully completed in accordance with the project. During the test, the connection points of individual sections are checked (if the preliminary heat pipe was tested in parts), welds, reinforcement and line equipment, density and strength of flange connections, linear equipment housings, etc.

Hydraulic testing is performed in this sequence: Mount the test setup; clean the heat pipe from the inside of the scale, soil and other objects; install plugs, gauges and taps; connect the water supply and press; Fill the pipeline with water to the specified pressure; inspect the pipeline and mark the defective spots; eliminate the detected defects; repeat the test; disconnect the water supply and drain water from the heat pipe; remove plugs and gauges.

To displace air from the pipes, the water pipe is brought to the bottom of the pipeline, all the air valves open, and the drain valves are closed. Near the air valves should be on duty, which overlap them when water appears.

Spring-loaded pressure gauges used for testing should be inspected and sealed by Gosstandart organizations; plugs must match technical requirements. Use of valves to disconnect the test section from existing networks is not permitted.

The test pressure is held for 5 minutes. The pressure gauge is checked to see if there is a drop in pressure, after which the pressure is reduced to the working pressure. At working pressure, the pipeline is inspected and taped with welded seams with a hammer with a handle no longer than 0.5 m. The hammer mass should not exceed 1.5 kg. The blows are applied not by the seam, but by the pipe (not closer than 100 mm from the seam).

The test results are considered satisfactory if there is no pressure drop across the manometer and no leakage or sweating of joints is detected.

At the final hydraulic test  with the installed fittings and equipment, the test pressure is held for 15 minutes. Then inspect the welded and flanged joints, fittings and line equipment and then lower the pressure to the working one. If, at the same time, the pressure drop within 2 hours does not exceed 10%, then the heat pipe is considered to have passed the test.

In winter, hydraulic testing of heat pipes should be carried out in short sections, while water heated to a temperature of 60 ° C must be used for the test. In addition, lowering devices are installed to ensure water drainage from the pipes within 1 hour.

Pneumatic testing of heat pipes  only when hydraulic test  can not be applied. The length of the test section is not more than 1000 m.

The pneumatic test is carried out in this sequence: purify and purge the pipeline; install plugs and gauges; a compressor is connected to the pipeline; fill the pipeline with air to a predetermined pressure; prepare a soap solution; inspect the pipeline, lubricating the joints with a soap solution, and mark the defective spots; eliminate the detected defects; Secondly test the pipeline; Disconnect the compressor and bleed the air from the pipeline; remove plugs and gauges.

Dirt in the pipeline is determined in several ways: by the sound of leaking air; on bubbles formed at the point of leakage, when joints and other welded joints  covered with soap solution; by smell, if ammonia, ethyl and other gases with a pungent smell are added to the air supplied from the compressor to the pipeline. The most common method is using soapy water, which includes water -1 liters and household soap - 100 g. If the test temperature of outdoor air is below 0 ° C, in a soap solution, water is partially (up to 60%) replaced with alcohol or other non-freezing liquid , which dissolves the soap.

When pre-testing the pipeline  are held under test pressure for 30 minutes, then the pressure is reduced to 3 kgf / cm2 and the pipeline is inspected. If inspection shows no leakage, defects in the welded seams, pipeline integrity violation, as well as the shear or deformation of the fixed support structures, the pipeline is considered to have withstood a preliminary pneumatic test.

Defects identified during the inspection of the pipeline defects are eliminated after the excess pressure in it has been reduced to zero.

In the final pneumatic test, the pressure in the pipeline is brought to the test and maintained for 30 minutes. If the integrity of the pipeline is not disturbed, the pressure is reduced to 0.5 kgf / cm2 and the pipeline is maintained at this pressure for 24 hours. Then, a pressure of 3000 mm of water is set. Art. and note the time of the test and the barometric pressure.

Hydropneumatic flushing is more effective than hydraulic. In this case, the air is supplied to the pipeline, the cross-section of which is not completely filled with water. Turbulent movement of water is created in the pipes, which contributes to a good washing.

Pipelines are washed until the water is completely clarified.

Pipeline flushing. In the pipeline after installation, there may be various kinds of pollution: scale, stones, soil, etc. To remove them, the pipeline should be flushed with water (hydraulic flushing) or a mixture of water and air (hydropneumatic flushing).

The heat conductor is usually washed two times: the first washing is roughing, the second - finishing.