SNIP 3.05.03-85 - The thermal network

SNIP 3.05.03-85 - The thermal network

building regulations

THERMAL NETWORK

SNIP 3.05.03-85

USSR State Committee for Construction

Moscow1996

Orgenergostroy developed by the Institute of Energy of the USSR (LY Mukomel - the head of the theme; Candidate of Technical Sciences S. Jacobson..).

INCLUDED USSR Ministry of Energy.

prepared for approval Glavtehnormirovaniem USSR State Construction Committee ( NA SHishov ).

With the introduction of SNIP 3.05.03-85 "Heating networks" loses force SNIP III-30-74 «Water supply, sewerage and heating.External networks and facilities. "

approved by Gosgortechnadzor USSR April 15, 1985

When using the standard document should take into account the changes approved building codes and state standards, published in journal "Bulletin of construction machinery", "Compendium of changes to the building regulations"State Construction Committee of the USSR and the information signs "State standards of the USSR" State standard.

your country of Gov. USSR Committee for construction (Gosstroy USSR)	Building Regulations	SNIP 3.05.03-85
thermal network	Instead SNIP III-30-74

These rules apply to new construction, expansion and reconstruction of existing heat network, transporting the hot water temperature t £ 200 ° C and pressure Py £ 2,5 MPa (25 kgf / cm2)and the steam temperature t £ 440 ° C and pressure Py £ 6,4 MPa (64 kgf / cm2) from the heat source to the heat consumers (buildings, structures).

1. GENERAL PROVISIONS

1.1. During the construction of new, expansion and reconstruction of existing heating networks in addition to the requirements of design drawings, manufacturing works projects (PPR), and these rules must comply with the requirements of SNIP 3.01.01-85, SNIP 3.01.03-84, SNIP III-4-80 andstandards.

1.2. works on manufacturing and installation of pipelines, which are subject to the requirements of installation and safe operation of steam and hot water Gosgortechnadzor USSR (hereinafter - Rules Gosgortechnadzor USSR), must be made in accordance with the said Rules and the requirements of these regulations.

1.3. Completed construction of heating networks should be taken into operation in accordance with the requirements of SNIP III-3-81.

2. EARTHWORK

2.1. Excavation work and work on base of the device must be performed in accordance with the requirements of SNIP III-8-76, SNIP 3.02.01-83, CH 536-81 and this section.

2.2. smallest width of the bottom of the trench during the underground laying of pipes should be equal to the distance between the outer side edges of the extreme isolation of pipelines of heat networks (associated drainage) with the addition on each side for pipelines conventional Dy diameter up to 250 mm - 0.30 m, more than 250 to 500 mm- 0.40 m, 500 to 1000 mm - 0.50 m;the width of the pits in the trench for welding and pipe insulation joints at underground laying of pipelines should be equal to the distance between the outer side edges of the extreme isolation of pipelines with the addition of 0.6 m on each side, the length of the pits - 1.0 m and depth from the bottom edge of the insulation of pipelines -0.7 m if the other requirements are not justified by the working drawings.

Made USSR Ministry of Energy

Approved by Decree of the USSR State Committee for building Affairs from October 31, 1985 № 178

Term introduction into effect July 1, 1986

2.3. smallest width of the trench at the bottom of the channel a lining of thermal networks must be equal to the width of the channel based on the formwork (in solid areas), waterproofing and drainage associated dewatering device mounting structure of the trench with the addition of 0.2 m. The width of the trench should be less than. 1.0 m

If necessary, the work of people between the outer edges of the channel structure and the walls and slopes of the trench width between the outer edges of the channel structure and the walls and slopes of the trench in the world should be at least 0.70 m - to the trenches with vertical walls and0.30 m - for trenches with slopes.

2.4. backfilling of the trench with the channel-free channel and pipeline construction should be carried out after preliminary tests on pipelines strength and tightness, insulation and full implementation of civil and erection works.

backfill must be carried out in this process sequence:

Quilting sinuses between the pipelines underground laying and ground;

simultaneous uniform filling of cavities between the walls of trenches and pipes underground laying, as well as between the walls of the trench and channel the camera when the channel strip at a height of not less than 0.20 m above the pipes, channels, chambers;

backfilling the trench to the design marks.

backfilling of the trench (pits), which are not transferred to the additional external loads (except its own weight of soil), as well as tranches (pits) on the crossing sites with existing underground utilities, streets, roads, thoroughfares, squares and other structures of settlements andindustrial sites should be carried out in accordance with the requirements of SNIP III-8-76.

2.5. After disconnecting the temporary dewatering devices, channels and chambers should be visually inspected at their lack of groundwater.

2. EARTHWORK

2.1. Excavation work and work on base of the device must be performed in accordance with the requirements of SNIP III-8-76, SNIP 3.02.01-83, CH 536-81 and this section.

2.2. smallest width of the bottom of the trench during the underground laying of pipes should be equal to the distance between the outer side edges of the extreme isolation of pipelines of heat networks (associated drainage) with the addition on each side for pipelines conventional Dy diameter up to 250 mm - 0.30 m, more than 250 to 500 mm- 0.40 m, 500 to 1000 mm - 0.50 m;the width of the pits in the trench for welding and pipe insulation joints at underground laying of pipelines should be equal to the distance between the outer side edges of the extreme isolation of pipelines with the addition of 0.6 m on each side, the length of the pits - 1.0 m and depth from the bottom edge of the insulation of pipelines -0.7 m if the other requirements are not justified by the working drawings.

Made USSR Ministry of Energy

Approved by Decree of the USSR State Committee for building Affairs from October 31, 1985 № 178

Term introduction into effect July 1, 1986

2.3. smallest width of the trench at the bottom of the channel a lining of thermal networks must be equal to the width of the channel based on the formwork (in solid areas), waterproofing and drainage associated dewatering device mounting structure of the trench with the addition of 0.2 m. The width of the trench should be less than. 1.0 m

If necessary, the work of people between the outer edges of the channel structure and the walls and slopes of the trench width between the outer edges of the channel structure and the walls and slopes of the trench in the world should be at least 0.70 m - to the trenches with vertical walls and0.30 m - for trenches with slopes.

2.4. backfilling of the trench with the channel-free channel and pipeline construction should be carried out after preliminary tests on pipelines strength and tightness, insulation and full implementation of civil and erection works.

backfill must be carried out in this process sequence:

Quilting sinuses between the pipelines underground laying and ground;

simultaneous uniform filling of cavities between the walls of trenches and pipes underground laying, as well as between the walls of the trench and channel the camera when the channel strip at a height of not less than 0.20 m above the pipes, channels, chambers;

backfilling the trench to the design marks.

backfilling of the trench (pits), which are not transferred to the additional external loads (except its own weight of soil), as well as tranches (pits) on the crossing sites with existing underground utilities, streets, roads, thoroughfares, squares and other structures of settlements andindustrial sites should be carried out in accordance with the requirements of SNIP III-8-76.

2.5. After disconnecting the temporary dewatering devices, channels and chambers should be visually inspected at their lack of groundwater.

3. STRUCTURES AND INSTALLATION CONSTRUCTION

3.1. production work on the construction and installation of building structures should be carried out in accordance with the requirements of this section and the requirements:

SNIP III-15-76 - in the construction of monolithic concrete and reinforced concrete foundations, supports for pipes, chambers and other structures, as well asembedment of joints;

SNIP III-16-80 - the installation of precast concrete and reinforced concrete structures;

SNIP III-18-75 - the installation of metal structures supports superstructures for pipelines and other structures;

SNIP III-20-74 - with waterproofing channels (cameras) and other building structures (buildings);

SNIP III-23-76 - in the protection of building structures against corrosion.

3.2. outer surfaces supplied to the track elements of channels and chambers should be covered lubricative coating or lining hydraulic seals in accordance with the working drawings.

installation elements channels (cameras) in the design position should be carried out in the technological sequence of production linked to the project of installation and preliminary testing of pipe lines for resistance and impermeability.

booster cushion under the sliding pipe supports should be installed at the distances specified in SNIP II-D.10-73 * (II-36-73 *).

3.3. Monolithic stationary shield support must be performed after the installation of the pipelines in the area shield support.

3.4.In places I underground laying of pipelines in the channels and chambers of the building (construction) cases should wear bushing seals on pipes during their installation.

to input pipeline underground installation in the building must be made (in accordance with the working drawings) of the device, preventing the penetration of gas into the building.

3.5. Before installing the upper trays (plates) channels should be cleaned of soil, debris and snow.

3.6. deviation channel bottom slope heating network and drainage pipes from the project permitted by the amount of ± 0,0005, while the actual slope should not be less than the minimum allowed by SNIP II-D.10-73 * (II-36-73 *).

deviation parameters set other building structures from the project must comply with the requirements of SNIP III-15-76.SNIP III-16-80 and SNIP III-18-75.

3.7. the construction project and the project of works to be provided for advancing the construction of drainage and pumping devices for the water issue in accordance with the working drawings.

3.8. Before laying in a trench drains should be inspected and cleaned of soil and debris.

3.9. dusting filter in layers of drainage pipes (except trubofiltrov) gravel and sand must be performed using the separation of inventory forms.

3.10. straight sections of drainage pipes between adjacent wells should be checked by inspection "born" with the help of a mirror before and after backfilling the trench.Reflected in the mirror pipe circumference must have the correct shape.Allowable deviations from the horizontal circle should be less than the tube diameter of 0.25, but not more than 50 mm in each direction.

deviation from the correct vertical circle shape is allowed.

4. Pipelining

4.1. Piping must be performed by specialized installers, with installation of the technology must provide high operational reliability of the pipelines.

4.2. Details of pipelines (joints, mudguards, insulated pipes, as well as components of pipelines and other products) should be made centrally (in the factory, workshops, workshops) in accordance with the standards, specifications and project documentation.

4.3. pipe laying in the trench, the channel or to the aerial structure should be carried out according to the technology provided by the project of manufacture of works and eliminates the appearance of residual deformations in pipelines, tampering with anticorrosive coating and thermal insulation through the use of appropriate mounting accessories, the correct placement of simultaneous hoisting machinery.

design fastening installation devices to the pipes must ensure the safety of the coating and pipe insulation.

4.4. laying of pipelines within the bearing shield should be performed with a maximum pipe length of the delivery.Thus ovarnye transverse seams of pipelines must generally be arranged symmetrically with respect to the shield support.

4.5. Laying pipes with a diameter of 100 mm with a longitudinal or spiral weld should be made with an offset of the seams by no less than 100 mm.When laying pipe diameter of less than 100 mm offset seams must be at least three times the pipe wall thickness.

longitudinal seams must be within the upper half of the circumference of the stacked pipes.

knuckle and pressed bends pipelines allowed to weld together without a straight section.

Welding of pipes and taps in welded joints and bent elements are not allowed.

4.6. When installing piping movable supports and suspension should be offset with respect to the design position at the distance specified in the working drawings in a direction opposite to the movement of the pipeline in operation.

In the absence of data in the working drawings moving support and suspension of horizontal pipes must be offset with a correction for the outdoor temperature when mounted on the following values:

slide bearings and fasteners suspension to the tube - half of the thermal elongation of the pipeline at the site of attachment;

Rollers roller bearings - a quarter of thermal elongation.

4.7. Spring hangers for mounting pipes must be tightened in accordance with the working drawings.

During the execution of hydraulic tests of steam pipelines of 400 mm or more in diameter should be placed in the suspension spring to unload the unit.

4.8. pipeline valves should be installed in a closed state.Flanged and welded connection fittings should be performed without tension lines.

deviation from perpendicularity of the plane of the flange is welded to the pipe with respect to the axis of the pipe must not exceed 1% of the outer diameter of the flange, but be not more than 2 mm at the top of the flange.

4.9. Bellows (wavy) and expansion glands should be mounted in assembled form.

When laying underground heating networks installation of expansion joints in the design position shall be permitted only after the preliminary testing of pipelines on the strength and integrity, backfill underground laying of pipelines, channels, chambers and shield supports.

4.10. Axial bellows expansion joints and stuffing box should be installed on pipes without breaking axis compensators and pipe axes.

deviate from the design position of connecting pipes joints when installing and welding should be no more than indicated in the technical specifications for the manufacture and supply of compensators.

4 .11.