Gas supply to commercial warehouse

Contents

PROJECT COMPOSITION

PERFORMERS

1. GENERAL PART

1.1. BASIS FOR PROJECT DEVELOPMENT

1.2. OBJECT CHARACTERISTICS

1.3. MASTER PLAN

2. GAS SUPPLY SYSTEM

2.1. GAS SUPPLY SCHEME

2.2. INTERNAL GAS EQUIPMENT

2.3. AUTOMATIC GAS ALARM

2.4. GAS PIPELINES AND STRUCTURES ON THEM

2.4.1. Gas pipelines

2.4.2 Gas Control Station

2.4.3. Gas flow metering point

2.5. ANTI-CORROSION COATING OF GAS PIPELINE

2.6. INCOMING QUALITY CONTROL OF PIPES AND PARTS

2.7. QUALITY CONTROL OF WELDED JOINTS AND TESTING OF GAS PIPELINES

3. ENVIRONMENTAL PROTECTION

4. MAIN PROVISIONS FOR THE ORGANIZATION OF CONSTRUCTION

4.1. GENERAL PART

4.2. GAS PIPELINE TEST

4.3. MEASURES TO PRESERVE AND REBUILD ADJACENT ENGINEERING FACILITIES

4.4. MANDATORY TERMS AND CONDITIONS

4.5. HEALTH AND SAFETY MEASURES

PROJECT COMPOSITION

PERFORMERS

1. GENERAL PART

1.1. BASIS FOR PROJECT DEVELOPMENT

1.2. OBJECT CHARACTERISTICS

1.3. MASTER PLAN

2. GAS SUPPLY SYSTEM

2.1. GAS SUPPLY SCHEME

2.2. INTERNAL GAS EQUIPMENT

2.3. AUTOMATIC GAS ALARM

2.4. GAS PIPELINES AND STRUCTURES ON THEM

2.4.1. Gas pipelines

2.4.2 Gas Control Station

2.4.3. Gas flow metering point

2.5. ANTI-CORROSION COATING OF GAS PIPELINE

2.6. INCOMING QUALITY CONTROL OF PIPES AND PARTS

2.7. QUALITY CONTROL OF WELDED JOINTS AND TESTING OF GAS PIPELINES

3. ENVIRONMENTAL PROTECTION

4. MAIN PROVISIONS FOR THE ORGANIZATION OF CONSTRUCTION

4.1. GENERAL PART

4.2. GAS PIPELINE TEST

4.3. MEASURES TO PRESERVE AND REBUILD ADJACENT ENGINEERING FACILITIES

4.4. MANDATORY TERMS AND CONDITIONS

4.5. HEALTH AND SAFETY MEASURES

5. MEASURES TO ENSURE INDUSTRIAL SAFETY, PREVENTION OF ACCIDENTS AND LOCALIZATION OF THEIR CONSEQUENCES AT HAZARDOUS PRODUCTION FACILITY

5.1. CONSTRUCTION REQUIREMENTS

5.2. REQUIREMENTS FOR ORGANIZATIONS OPERATING HAZARDOUS PRODUCTION FACILITIES

5.3. REQUIREMENTS FOR TECHNICAL DEVICES

5.4. STATE SUPERVISION OF COMPLIANCE WITH REGULATIONS

5.5. PRODUCTION MANAGEMENT AND ORGANIZATION OF OCCUPATIONAL SAFETY

6. EMERGENCY PREVENTION ACTIVITIES

7. OPERATION OF THE GAS FARM

9. INPUT DATA

1.3. Master Plan

The general plan for laying the gas pipeline route has been decided in accordance with the agreed gas pipeline route scheme and provides for the implementation of environmental, sanitary, fire and other standards in force on the territory of the Russian Federation and linking the decisions made with the existing development and placement of a gas control point (cabinet).

The medium pressure gas pipeline route is laid by horizontal directional drilling.

According to the Decree of the Government of the Russian Federation No. 878 of 20.11.2000 for gas distribution networks, maintain the following protection zones:

- along the route of external gas pipelines in the form of an area limited by conventional lines passing at a distance of 2 meters on each side of the gas pipeline;

- along the gas pipeline route of polyethylene pipes when using a copper wire - satellite to indicate the gas pipeline route - at least 3 meters from the gas pipeline from the pro-water-satellite side and 2 meters from the opposite side;

- around separate gas control points - in the form of an area bounded by a closed line, drawn at a distance of 10 meters from the borders of these objects.

Any work in the protection zone of gas distribution networks is carried out with strict compliance with the requirements for the safety of open networks and other engineering communications, as well as for the safe passage of special vehicles and pedestrians.

The following restrictions (encumbrances) are imposed on land plots included in the protection zones of gas distribution networks in order to prevent their damage or violation of their normal operation conditions:

a) to build residential, civil and industrial facilities;

b) demolish and reconstruct bridges, headers, roads and railways with gas distribution networks located on them without preliminary removal of these gas pipelines in agreement with operating organizations;

c) destroy coastal structures, culverts, earthen and other structures that protect gas distribution networks from destruction;

d) move, damage, fill and destroy identification marks, control points and other devices of gas distribution networks;

e) arrange landfills and warehouses, pour solutions of acids, salts, alkalis and other chemically active substances;

f) fencing and fencing protection areas, preventing access of personnel of operating organizations to gas distribution networks, maintenance and repair of damage to gas distribution networks;

g) raise fire and place sources of fire;

and) dig cellars, dig and cultivate soil with agricultural and reclamation tools and mechanisms to a depth of more than 0.3 meters;

k) open the gates and doors of gas control stations, cathodic and drainage protection stations, hatches of underground wells, switch on or off the power supply of communications, lighting and telemechanics systems;

l) discard, attach and tie foreign objects, stairs to supports and above-ground gas pipelines, fences and buildings of gas distribution networks;

m) unauthorized connection to gas distribution networks.

Forestry, agricultural and other works not related to the violation of the land horizon and soil cultivation to a depth of more than 0.3 meters are carried out by owners, owners or users of land plots in the protection zone of the gas distribution network, subject to prior written notification to the operating organization at least 3 working days before the start of work.

Economic activity in security zones of gas distribution networks at which is made violation of a surface of the land plot and processing of the soil on depth more than a meter, carried out on the basis of the written permission of the operational organization of gas distribution networks.

2. Gas supply system.

2.1. Gas supply diagram.

The project provides for the gas supply of a trade and warehouse premises located at the address: Tula Region, Leninsky Rn, Medvenskoye village, 3600 m in the direction to the south-west of Molodezhny village, Tsentralnaya St., 4.

Gas supply is provided from the existing underground steel gas pipeline of medium pressure (Rpr = 0.3MPa, Rfact0.28MPa) 159mm, laid from GGRP No. 118 to the Stamp plant.

For reduction of gas pressure from average Rpact = 0.28 MPa, to low P = 2.0 kPa, and automatically maintaining the output pressure at a predetermined level regardless of the change in flow rate and input pressure, automatic stop of gas supply in case of emergency increase or decrease of inlet pressure above the specified limits, provision is made for installation on the outer wall of the gasified building of the cabinet gas control station GRPSH10MS with one reduction line with the pressure regulator RDGK10M, throughput B = 40 m ³/h at Pinl = 0.3 MPa. Setting range of the regulator 0.0015 MPa ... 0.002 MPa.

2.4. Gas pipelines and structures on them.

2.4.1. Gas pipelines.

The designed medium pressure gas pipeline is laid underground from polyethylene pipes according to GOST R 508382009.

Pipes are produced by domestic plants and have a quality certificate of the manufacturer's plant.

The depth of the gas pipeline laying in highly sandy soils is accepted below the freezing depth, namely at least 1.4 m to the top of the pipe.

When passing the gas pipeline route in highly submerged soils, it is necessary to fill under the gas pipeline with non-freezing loose soil (sand) to a height of not less than 10 cm and fill not less than 20 cm, according to PB 1252903 p.6.6.

To determine the location of the polyethylene gas pipeline route, at the angles of rotation, at the places of installation of valves and structures (belonging to the gas pipeline), at the boundaries of the gas pipeline laying by horizontal directional drilling, reinforced concrete columns 1.5 m high are installed at a distance of 1 m from the gas pipeline axis on the right side of the gas path or signs for permanent landmarks.

The identification mark shall bear data on the diameter, pressure, depth of the gas pipeline, material of pipes, distance from the gas pipeline, structure or characteristic point and information about the operating organization with indication of contact telephones and address.

Along the entire gas pipeline route, with the exception of sections of the navigator operation area, a signal tape is laid at a distance of 0.2 m from the upper generatrix of the gas pipeline.

Transition of polyethylene gas pipeline through a/road:

Laying of the gas pipeline of the average pressure P0.3 of MPa of 63х5.8 polyethylene through and / to execute the road by method of the horizontal directed drilling. The transition length will be L = 20.4 m (PC0 + 3, 7PK0 + 24.1).

The transition by the medium pressure polyethylene gas pipeline of the highway is provided in the case in 2 places by the HNS method.

The depth of gas pipeline laying is accepted during works by horizontal directional drilling - not less than 1.5 m below the terrain profile.

Application of the method of transition by horizontal directional drilling through natural barriers allows:

- Exclude the performance of coastal reinforcement works, which account for more than 50% of the cost of construction of the transition;

- reduce the cost of construction of the transition;

- eliminate the necessity of gas pipeline ballasting;

- preserve the natural-ecological state of the area.

Polyethylene pipes with SDR of not more than 11 and safety factor of not less than 2.6 are used for horizontal directional drilling transitions.

Work on the production of a closed construction method using the horizontal directional drilling method is carried out in accordance with the requirements of SP 421012003 item 10.118 10.131 and applications L, M.

The project for the performance of work on the production of the closed method of construction of the transition is carried out by a specialized organization before the start of work.

Working and receiving pits are arranged. Their attachment is provided by 30 mm thick boards. Boards are laid on vertical posts and fixed with braces.

In the place of tie-in there is provided installation of polyethylene ball valve of 63 mm at medium pressure in underground non-colodless version with rod withdrawal under the carpet to PK0 + 1.5.

Polyethylene cranes are installed in accordance with the recommendations of the manufacturer, as a rule, on the support pad. Polyethylene faucets made of high density polyethylene (PEHD) are used at ¼ turns. Polyethylene grade PE100 SDR11. The maximum allowable operating pressures are 10 bar (for gas).

Installation of polyethylene gas pipelines.

Connections of 63 mm polyethylene pipes to each other are made using couplings with embedded heating elements. Welding by means of connecting parts with embedded heaters is also used for welding to the pipeline of parts from PSP (tees). Welding of polyethylene pipes shall be performed at ambient air temperature of 15 ° С-+ 40 ° С, at lower ambient air temperature welding shall be performed in special shelters.

When laying gas pipelines in a trench, measures are taken to reduce stress in pipes from temperature changes during operation at the temperature of pipes (ambient air) above + 10 ° C, the gas pipeline is laid with a free bend ("snake"), and backfilling - in the coldest time of day; at ambient temperature below + 10 ° С, it is possible to lay the gas pipeline rectilinear, including in narrow trenches, and fill the gas pipeline at the warmest time.

The linear part of the pipeline of polyethylene pipes in horizontal and vertical planes shall be rotated using cast taps of polyethylene manufactured in the factory. If there are no polyethylene taps, it is allowed to perform elastic or natural bending with radius of not less than 25 pipe diameters.

Polyethylene pipes shall be stored under conditions ensuring their safety from damage. It is not allowed to use flattened pipes for the construction of the gas pipeline, having a diameter reduction of more than 5% of the nominal, and pipes with cuts and scratches with a depth of more than 0.7 mm.

Installation of steel gas pipelines.

Lay the gas pipeline on a dense and even base, which protects the gas pipeline from subsidence, and insulation - from damage.

Steel pipes of gas pipelines shall be connected by electric welding.

Compensation of temperature extensions of the steel pipe of the gas pipeline is made due to natural bends.

The construction of the gas pipeline can be started with the complete provision of pipes and connecting parts.

Installation of gas pipelines shall be carried out by a specialized installation organization in accordance with the requirements of SP 421012003 "General Provisions for the Design and Construction of Gas Distribution Systems from Metal and Polyethylene Pipes," SP 421032003 "Design and Construction of Gas Pipelines from Polyethylene Pipes and Reconstruction of Worn Out Gas Pipelines," "Safety Rules for Gas Distribution and Gas Consumption Systems" PP. 1252903

2.4.2 Gas Control Station

For pressure decrease of gas from an average of the RPR of =0.30 MPas (Rfakt of =0.28 MPas) to low the RPR of =2.0 kPa, provides installation gas control cupboard GRPSh10MS with one line of reduction and the regulator of pressure RDGK10M, m³/ч B=40 capacity at Rvkh of =0.3 MPas.

The maximum hourly gas consumption in winter for a non-residential building is 9.7 nm3/h.

Minimum - 2 nm3/h.

The type of pressure regulator is selected by the design pressure at the inlet to the SGR and the design maximum load.

The GRPSH10MS installation consists of a metal cabinet with a door in which process equipment is installed. The plant process gas equipment consists of one reduction line.

The reduction line consists of:

- crane at the inlet;

- RDGK10M gas pressure regulator with built-in PZK and filter designed to reduce gas pressure and keep it within the specified limits;

- autonomous UCS.

The station operates as follows: gas is supplied through the inlet pipeline through the valve to the regulator inlet, where it is reduced to the required value and through the valve it is supplied to the consumer. Relief relief valve is used for discharge of part of gas into atmosphere at increase of output pressure. In case of further increase or decrease of output pressure, safety shut-off valve is actuated.

For control of gas pressure at inlet and outlet there are nozzles for pressure gauges.

2.4.3. Gas flow metering point.

Commercial accounting of gas flow rate is provided using BKG6T diaphragm meter with mechanical thermal compensation installed in the heat generator. The measuring range of the volume flow rate of gas (under operating conditions) is 0.06-10.0m ³/h.

Technical specifications:

Maximum allowable pressure: 50 kPa.

Pressure loss is not more than: 200 Pa.

Working medium temperature: from minus 25С to plus 40С.

The ambient temperature at which the meter does not malfunction: from minus 40С to plus 55С.

Interval: 10 years.

The service life of the meter is at least 24 years.

Object Source:

- gas flow rate: max - 9.7 m ³/h;

min - 2 m ³/h.

- excess gas pressure 2 kPa.

The gas flow range that the BKG6T diaphragm meter is able to calculate at operating parameters:

According to the calculation, the received counter is able to take into account the necessary gas consumption.

2.5. Anti-corrosion coating of gas pipeline.

Underground gas pipelines made of polyethylene pipes are not subject to corrosion.

Permanent polyethylene-steel joints for protection against electrical chemical corrosion are filled with sand to the entire depth of gas pipeline laying.

Protection of underground steel gas pipeline against corrosion shall be provided by insulation of highly reinforced type from extruded polyethylene. For steel inserts with a length of not more than 10 m on the linear part of the gas pipeline, it is allowed not to provide EHZ according to paragraph 2.3.4 of PB 1252903. Backfilling of the trench in this case along the entire length and depth should be sandy.

Sections of the above-ground steel gas pipeline, for passive protection, be painted with enamel in 2 times, on two layers of primer.

At the outlet of the medium pressure gas pipeline from the ground, at the site of the SGR installation, an insulating welded joint of the SI20s type is installed.

The insulator design and the materials used provide high electrical co-resistance (more than 500 Mohm at 1kV voltage), tightness, protection of the insulating layer both from the influence of the external environment (ultraviolet radiation, moisture, dust, etc.) and from the transported gas. The dielectric properties of SI are significantly higher than IFS. Insulating connections, preventing current leakage during cathodic protection of gas pipelines, give significant savings in electricity.

2.6. Incoming quality control of pipes and parts

Pipes and parts delivered to the construction site are subject to external inspection in order to determine compliance with their design documentation and detect mechanical damages during their transportation; in addition, incoming quality control is carried out according to their main dimensions and characteristics.

Incoming quality control of pipes and parts at the construction site should be carried out by specialists of a certified laboratory in accordance with the established procedure.

For incoming control the following is taken from the batch of polyethylene pipes and parts:

- diameter 225 mm or more - 2% of pipes and parts;

- diameter from 90 to 200 mm - 1% of pipes and parts;

- diameter 75 mm and less - 0.75% of pipes and parts.

For incoming quality control of pipes in terms of appearance and dimensions from the incoming lot, the customer takes at least five samples in the form of pipe sections. If the number of post-drank pipes and parts is less than five pieces, then everyone is subject to control.