Working design of the high-pressure gas pipeline to the designed block-module boiler house

Contents

Introduction

Description of gas pipeline route and main decisions taken in the project

Technical documentation

Appendix 1. Design Certificate

Appendix 2. Design Task

Appendix 3. Technical Specifications for Gas Supply of Lenoblgaz OJSC

№ 2-20/2356/120 dated 23.07.2010

Appendix 4. Project Passport

Appendix 5. Permits of Gosgortekhnadzor of Russia and certificates of conformity for used equipment and materials

Explanatory Note

The project documentation complies with the current state norms, rules and standards.

Introduction

The working design of the high-pressure gas pipeline to the designed block-modular boiler house BMK12.08 MW, located at the address: Leningrad Region, Vsevolozhsk District, Shcheglovo Village, was commissioned by Mezhregionenergogaz OJSC in accordance with the specifications of Lenoblgaz OJSC.

The initial design data are:

- specifications of Lenoblgaz JSC No. 220/2356/120 dated 23.07.2010;

- technical assignment of Mezhregionenergogaz OJSC;

- topogeodetic materials;

The gas pipeline shall be laid in accordance with the requirements of:

- SNiP 42012002 Gas distribution networks.

- SNiP 1.04.0885 * Standards of construction duration and backlog in

construction of enterprises, buildings and structures.

- SNiP 2.07.0189 * Urban planning. Layout and development

urban and rural settlements.

- SNiP 3.02.0187 * Earthworks, foundations and foundations.

Rules for production and acceptance of works. Technology

safety in construction.

- SNiP 12.042002 Occupational safety in construction.

- GOST 9.6022005 Protection of building structures and structures

corrosion protection.

- SP 421012003 General Provisions for Design and Construction

gas distribution systems made of metal and

polyethylene pipes.

- SP 421022004 Design and construction of gas pipelines

from metal pipes

- SP 421032003 Design and construction of gas pipelines

polyethylene pipes and reconstruction

worn out gas pipelines.

- "Rules for the performance of work during the laying and reconstruction of underground engineering networks and structures, the construction and repair of road surfaces and the improvement of urban areas," approved by the Executive Committee of the Leningrad City Council.

- PB 1252903 Gas Distribution System Safety Rules

and gas consumption.

The purpose of the work is to carry out a working project of a high-pressure gas pipeline to the designed block-modular boiler room BMK12.08 MW, located at the address: Leningrad Region, Vsevolozhsky District, Shcheglovo.

The working documentation complies with the requirements of safety rules for gas distribution and gas consumption systems, construction codes and rules and other regulatory documents agreed with the Gosgortekhnadzor of Russia.

All works on the construction of gas pipelines must be carried out in accordance with the current SNiP, SP and Safety Rules. Boundaries of gas distribution networks protection zones shall comply with the Rules for protection of gas distribution networks (2 m on each side of the gas pipeline).

2. Characteristics of the gas pipeline route and main decisions made in the project

Gas supply project of the designed block-modular boiler house from the high-pressure distribution gas pipeline of category II, passing to the site of boiler house No. 38 .

The designed steel gas pipeline of high pressure Ø159x4.5 is connected to the existing underground gas pipeline of high pressure of the II category Ø219. Tie-in is carried out without pressure reduction using Manibs technology. At the point of connection, the project provides installation of a ball valve for gas with an elongated rod KSH150f and a HDPE adapter/steel 160/150. Further underground laying of the polyethylene Ø160x14.6 gas pipeline directly to the building of the boiler house is carried out. After an exit from the earth on a facade of the boiler house the steel Ø159x4.5 gas pipeline before input to the room is laid.

Laying of the underground gas pipeline of high pressure of Ø160x14.6 is carried out in the open way. During open laying of polyethylene gas pipeline it is necessary to provide laying at a distance of 0.2 m from the top of gas pipeline of signal tape with width of at least 0.2 m with indelible inscription "Flammable - GAZ." For sections of intersection with engineering communications, the tape must be laid along the gas pipeline twice at a distance of at least 0.2 m between each other and 2 m to both sides of the crossed structure.

For laying of the elevated gas pipeline of high pressure the project accepted steel pipes Ø159x4.5 in accordance with GOST 1070580 * and GOST 1070491 gr. Century.

For laying of underground high-pressure gas pipeline the following are accepted:

- steel pipes Ø159x4.5 in accordance with GOST 1070580 * and GOST 1070491 gr. In;

- polyethylene pipes PE 80 GAZ SDR 11 Ø160x14.6 in accordance with GOST P 5083895 with amendment 1-3 with durability safety factor not less than 2.8.

Steel section of underground gas pipeline is provided in insulation of "very reinforced type" according to GOST 9.6022005.

The disconnecting devices on the underground gas pipeline are a ball valve for gas with an elongated rod Vexve 117 KSH150s, on the above-ground - a ball valve for gas full-pass Vexve 309 KSH150f.

The above-ground steel gas pipeline is designed as a self-compensating system and is protected against atmospheric corrosion by a coating consisting of two layers of paint for external work on the primer layer.

Protection of underground polyethylene gas pipeline against electrochemical corrosion is not required.

The design uses polyethylene parts (tap, HDPE/steel adapters) with embedded electric heaters. Welding of polyethylene pipes is carried out using electric welded couplings of factory manufacture.

Installation of polyethylene pipes shall be performed at air temperature not lower than 15 ° С and not higher than + 40 ° С.

Sealing of the ends of the case installed at the outlet of the polyethylene gas pipeline from the soil is carried out by polyurethane foam of the Macroflex aerosol type.

Prior to testing, the installed gas pipeline is purged with compressed air to remove dust and debris from welding and installation works.

Construction of a system of gas supply has to be carried out by the construction organizations specialized in this area according to requirements Construction Norms and Regulations 42012002 and the Safety rules of systems of gas consumption and gas distribution existing ″ ″ in PB 1252903, etc.

Materials shall not be used without manufacturer's certificates or re-laboratory quality test data. Material replacement is only allowed with material having higher technical data.

All replacements must be previously agreed with the project organization.

Road signs shall be installed prior to commencement of works in accordance with traffic organization scheme. Protect the work area and install red warning lights. In the dark, the lighting of the construction site should be at least 6.0 lux excluding the possibility of blinding drivers and pedestrians.

The main technical and economic indicators are given in the project certificate.

General Instructions

1. The documentation was developed in accordance with the design assignment of Mezhregionenergogaz OJSC and the specifications of Lenoblgaz OJSC.

The adopted altitude system is Baltic.

Protection of the gas pipeline against electrochemical corrosion is not required .

2. Diameters of gas pipelines are accepted on the basis of hydraulic calculation made in

in accordance with the requirements of SP 421012003.

3. Technical solutions adopted in the detailed drawings meet the requirements

existing rules and regulations and ensure safety for life and health of people

operation of the facility in compliance with the measures specified in the drawings.

4. The gas pipeline shall be laid in accordance with the requirements of:

a/" Safety Rules for Gas Distribution and Gas Consumption Systems "PB 1252903.

b/SNiP 42012002, SNiP 118980 *, SNiP 2.07.01-89 *

in/SNiP 3.02. 0187 *, SP 421012003, SP 42-103-2003

d/SP421022004

e/" Rules of works execution during laying and re-arrangement of underground

engineering networks and structures, construction and repair of road surfaces

and improvement of urban areas, "approved by the Executive Committee of the Leningrad City Council .

4.1 Butt-connect steel pipes using manual arc

electric welding.

4.2 Connecting parts and parts for steel gas pipelines shall be factory

manufacturing. Connection parts and parts may be used,

manufactured at the bases of construction organizations, subject to the control of all welded

connections by non-destructive methods.

4.3 Polyethylene pipes and parts shall be interconnected by couplings and parts with embedded heaters as per SNiP 42012002 and SP 421012003, SP 421032003.

4.4 Connections of polyethylene pipes branches, as well as turns of gas pipelines

shall be made with polyethylene connectors according to

SNiP 42012002, SP 421012003, SP 421032003.

4.5 Tests of the gas pipeline shall be carried out in accordance with SP 421012003 and PB 1252903.

4.6 After gas pipeline laying and testing, cut blankings and weld to

operating gas pipeline. Warranty joint/at junction/check

physical control methods.

4.7 SNiP 42012002 shall be used when laying the gas pipeline.

a/The minimum depth of the gas pipeline shall be taken in accordance with paragraph 5.2.1.

b/Steel pipes shall be made of calm steel.

c/Steel pipeline fittings shall be used

and polyethylene pipeline valves on polyethylene gas pipelines.

g/Ends of cases of polyethylene gas pipelines shall be sealed with macroflex.

4.8 PB 1252903, SNiP 42012002,

SP 421012003.

4.9 Underground laying of gas pipelines and steel pipe cases is provided

with very reinforced insulation according to GOST 9. 6022005.

4.10 Perform quality control of welded joints by physical control methods.

4.11 Above-ground gas pipelines shall be protected against atmospheric corrosion by coating,

consisting of two layers of paint, lacquer or enamel intended for external work

under the color of the boiler room facade. Reinforcement and all supporting metal structures shall be protected against corrosion by paint coating.

4.12 The connection of the new gas pipeline to the existing one shall be made by the workers,

authorized to perform gas hazardous works under special

in addition to the presence of a representative of the operational gas service.

4.13 When laying the polyethylene gas pipeline, make sure to lay the signal tape

yellow color not less than 0.2 m wide with indelible inscription "Flammable gas" on

0.2 m from the upper generatrix of the gas pipeline. At the intersections of gas pipelines with underground engineering communications, the signal tape must be laid along the gas pipeline twice at a distance of at least 0.2 m between each other and 2 m to both sides of the crossed structure.

4.14 In this project, the patentability and patent purity of the applied

technological processes, equipment, instruments, structures, products and

no materials are required.

4.15 All works on redesign of gas pipelines shall be performed in accordance with SNiP,

SP and Safety Regulations. Boundaries of gas distribution networks protection zones shall comply with the Rules for Protection of Gas Distribution Networks (2 m on each side of the gas pipeline ).

General Instructions

1. The basis for the works is the contract agreement No. 06/1021 dated 01.12.2010 between the Customer - LLC Petersburg Teploenergo and General Contractor - LLC Severnaya Company and the boiler house design task (Appendix No. 1 to the contract) approved by the Customer.

The technical solutions adopted in the working drawings comply with the requirements of environmental, sanitary, fire and other standards applicable in the territory of the Russian Federation, and ensure safe operation of the facility for life and health of people, subject to the measures provided for in the working drawings.

The right to design is granted by the following documents:

Certificate of admission to work that has an impact on the safety of capital construction facilities series KL No. 000007, number 0002.0320107810183813P096 dated 21.05.2010 issued by Severnaya Company LLC.

The project was developed in accordance with the following regulatory documents:

PB 1252903 "Safety Rules for Gas Distribution and Gas Consumption Systems,"

SNiP 42012002 "Gas distribution systems,"

PR 50.2.01996 "Procedure for measurement using turbine and rotary meters" 1996,

SNiP II3576 * "Boiler Units"

The project provides for the installation in the boiler house of two water heating boilers Wolf Duotherm 500 with a capacity of 500 kW each. Boilers are equipped with combined burners: VGL 05.700 DP, KM company "ELCO."

Main indicators as per working drawings of GSV grade

The source of gas supply of the boiler house is the medium pressure gas pipeline P = 0.3 MPa (g ).

Gas pipeline symbols are accepted in accordance with GOST 21.609 - 83

Butt-joint of pipes, by manual arc electric welding as per GOST 1603780 "Welded joints of steel pipelines. Main types, structural elements and dimensions (with Change N 1), "except for connection points to valves. To make welding of gas pipelines GOST 946775 E42A electrodes.

Quality control of welded joints shall be performed by transmission method as per GOST 751282 *. Welding joints of the internal gas pipeline in the amount of 5% of their total number shall be checked by physical control methods.

The distances between gas pipelines laid on the walls of the building and other utilities should be taken in accordance with the requirements for laying gas pipelines indoors.

The gas pipelines shall be fixed as per design and in accordance with drawings of 5.9058 series.

Lay gas pipelines in the case through the boiler building wall according to the design and in accordance with drawings of 5.90515 series and SNiP 42012002 * item 7.5.

The space between the gas pipeline and the case should be sealed with a resin pack GOST 1618377, the ends of the case should be sealed with an elastic material (oil insulation bitumen GOST 961274). The space between the wall and the case should be carefully sealed to the entire thickness of the structure to be crossed

Blow-down and discharge gas pipelines shall be 1 m above the roof cornice.

To protect against corrosion, blowdown and discharge pipelines shall be insulated with anticorrosive coating consisting of 2 layers of primer GF021 and 2 layers of paint for external works. As a solvent, use coal solvent GOST 192879.

Installation of the gas counter (length of straight sections before and after it, insulation of the gas pipeline section during installation of the temperature sensor) shall be carried out strictly according to the design with compliance with the requirements of PR 50.2.0192006

The temperature sensor shall be installed in the straight section of the pipeline after the meter at a distance of not less than 2D and not more than 5D. The pressure sensor shall be installed at a distance of not less than 1D and not more than 3D.

Installation of gas pipelines shall be carried out by a specialized installation organization licensed to perform this type of work.

Installation, testing and acceptance of gas pipelines shall be carried out in accordance with the requirements of PB 1252903 "Safety Rules for Gas Distribution and Gas Consumption Systems," SNiP 42012002 "Gas Distribution Systems."

After completion of installation works and tests, gas pipelines, indoors, paint with oil paint for internal works in 2 layers.

Connect gas pipelines and blowdown gas pipelines to the grounding loop of the boiler room with a special core cable.