Reconstruction of the internal and external gas supply of the existing heating boiler house.

Explanatory Note

General part

The section "Gas supply" of the working design is based on:

- design tasks b/n;

- Specification

- section TM of this project.

and in accordance with the requirements of the following regulatory documents:

- SNiP 42012002 "Gas distribution systems";

- SP 421012003 "General Provisions for Design and Construction

gas distribution systems made of metal and polyethylene pipes ";

- PB 1252903 "Safety Rules for Gas Distribution Systems and

gas consumption. "

This section of the project provides for the reconstruction of the internal and external gas supply of the existing heating boiler house. The purpose of the boiler house reconstruction is to replace obsolete equipment and put the boiler house into operation without maintenance personnel .

The boiler house provides for the installation of two "Laars Mighty Therm HN500" water heating boilers with a capacity of 0.1187 MW each and one "Hoper 25A" water heating boiler with a capacity of 0.025 MW, with atmospheric burners for gas pressure of 2.2 kPa and 1.3 kPa, respectively. For the operation of the Hoper 25A boiler at the required pressure, a coupling low pressure regulator J 78 R Du 15 manufactured by KROMSHRODER, Germany, with an outlet pressure range of P = 917 mbar (yellow spring with 10 turns) is provided.

It is planned to place new gas-consuming equipment in the existing brick building of the existing boiler house, consisting of two boiler rooms, with a total volume of 271 m ³. The area of ​ ​ easily throwable structures is 10.3 m ². Boiler house belongs to category D and has II degree of fire resistance.

The boiler room operates in automatic mode without permanent maintenance staff around the clock year-round. Natural gas is used as fuel. Maximum total gas flow per boiler house is 29.0nm3/h, minimum - 3.0 nm3/h.

Internal gas supply

This project provides for the laying of in-boiler dilution gas pipelines from commissioning into the building to boilers. The connection point is the inlet of the low-pressure pipeline DN 80, coming from the designed GRPP (see the seeker sheet). Inlet pressure 2.2 kPa.

The boilers are equipped with an automatic shut-off valve that cuts off gas in emergency situations.

In addition, for the safe operation of the boiler room and the gas supply system, the following measures are provided:

- at the inlet of the low pressure gas pipeline in the boiler room are installed

heat-intake valve, which cuts off gas supply at temperature increase in

in case of fire and solenoid shut-off valve, which disconnects gas supply via

signal of automatic gas content control system at increase

concentrations of carbon monoxide (CO) and methane (CH4) in the air of the working zone above

norms;

- instrumentation for visual inspection and

recording of gas operating parameters (see ATM partition);

- safety plugs are removed from each burner unit to be installed;

- blowdown pipelines are removed from the points farthest from the input

gas pipeline;

- alarm about violation of gas parameters is output to the control panel of heating networks via mobile communication, refer to section of OPS.

Ground all electrical devices of the designed internal gas supply system of the boiler house (refer to E.).

Lightning protection of blowdown pipelines of the designed internal gas supply system is performed in section E.

For installation of internal gas pipelines, steel electric welded straight-joint pipes according to GOST 1070491, supply according to Group B of GOST 1070580 and (for Du < 50) steel water and gas pipes according to GOST 326275 are accepted. Install the gas pipeline on welding. The welded joint shall be of equal strength to the main pipe metal or shall have the strength factor of the welded joint guaranteed by the manufacturer according to the standard or the pipe specification .

The valves provided by the design are intended for the gas environment. Tightness of valves of the accepted shut-off valves is not less than class "B" of solenoid valves - not less than class "A."

The passage of gas pipelines through the walls should be made in cases of series 5.90525.05 efflux 1, part 1 in relation to .

The gas pipelines shall be attached according to 5.90518.05 and 5.90525.05 series. Paint the gas pipeline along the entire length with yellow enamel in 2 layers according to 2 layers of GF021 primer.

Installation, testing and commissioning shall be carried out in accordance with "Safety Rules for Gas Distribution and Gas Consumption Systems" PB 1252903 and SNiP 42012002 "Gas Distribution Systems."

Installation of the gas supply system facilities shall be performed by the construction and installation organization in a contracted manner, subject to permission (license) of the gas supervision bodies.

The working project adopted technical solutions that meet the requirements of environmental, sanitary, fire and other standards applicable on the territory of the Russian Federation

External gas supply

This section of the project provides for the reconstruction of the external gas supply to the heating boiler house with a total installed capacity of 0.263 MW and includes:

- section of medium pressure gas supply pipeline from tie-in point to GRPSH;

- GRPP for pressure reduction from medium to low;

- section of low pressure gas pipeline from GRPP to boiler house wall.

The point of tie-in is the existing medium pressure steel gas pipeline

Ø 80, laid on the wall of the boiler room. The mean-factic pressure at the tie-in point is 0.15 - 0.25 MPa.

Length of the section of the pipeline of average pressure of Ø57x3.0. from the tie-in point to the site of GRPSH installation is 1.2 m. The tie-in should be performed according to the series 5.905 -25.05 effect.1, part 2.

To reduce the pressure from the average (0.25MPa) to the low (0.0022MPa), the GRPSN (U) 032 with the pressure regulator RDNK32/6, with the main and standby reduction lines, is provided. GRPSH is delivered in full factory configuration of ZAO ZAVOD SLAVA AND NADEZHDAGAZ of Saratov .

Maximum regulator capacity at Pinl = 0.25MPa and

The moat = 0, 0022MPa is 47 nm3/hour. The percentage of regulator loading is 62% at Qmax = 29 m3/h and 6% at Qmin = 3 m3/h.

Settings for actuation of safety valves:

- discharge - at pressure increase - 2.42 kPa

- shut-off - at pressure increase - 2.55 kPa

- at pressure decrease - 1.7 kPa

The limits of UCS and PZK actuation shall be specified during installation according to the minimum and maximum permissible pressure at which the burner can operate.

Discharge and blowdown gas pipelines from GRPP shall be brought above the boiler house roof skate by 1m.

Gas release from pipelines is short-term - in case of parameters violation or during start-up after installation or repair .

Grounding, lighting and lightning protection of GRPS are executed in Section (E).

GRPSH is attached to the boiler room wall. (refer to NPP section).

There is a free approach path to the GRPP with a solid base for emergency and fire engines.

A gas rotary meter RVGG65 (1:100) with the direction of the arrow on the housing in the direction of gas flow is provided for commercial accounting of gas flow at the medium pressure gas pipeline in the same cabinet from the FRG to the pressure regulators (in the place of the coil). To correct the gas flow rate by temperature and pressure, the counter is equipped with the corrector SPG741.1 (see section AGSNU). The meter, corrector and corresponding sensors are available to the customer .

Installation of URG is performed by a specialized organization .

Before and after GRPP install shutoff valves - ball valves KSH16/50. Install a non-detachable insulating flange joint manufactured by Malen CJSC on the low pressure gas pipeline before entering the boiler room.

The designed low-pressure gas pipeline from GRPP to the boiler room shall be made of pipes ∅89kh3,5 and ∅57kh3,0 according to GOST 1070491, having a manufacturer's certificate, supply according to Group B of GOST 1070580 from steel grade st3sp according to GOST 38094 .

Attachment of pipelines ∅89kh3,5 and ∅57kh3,0 to the wall shall be made according to the series 5.90518.05 effect1, part 1, and the pipelines ∅20 be attached in place, the material for attachment is taken into account in the specification.

Prior to installation it is envisaged to remove the section of existing gas pipeline l = 8m and drying cabinet of hydraulic fracturing with equipment.

Install the gas pipeline on welding. The welded joint shall be of equal strength to the main pipe metal or shall have the strength factor of the welded joint guaranteed by the manufacturer according to the standard or the pipe specification.

Paint the gas pipelines and supports along the whole length with yellow enamel in 2 layers according to 2 layers of GF021 primer .

The project shall be agreed with all interested organizations.

Installation, testing and commissioning shall be carried out in accordance with "Safety Rules for Gas Distribution and Gas Consumption Systems" PB 1252903 and SNiP 42012002 "Gas Distribution Systems."

Construction of gas supply system facilities is carried out by contracting method of construction and installation organization with permission (license) of gas supervision bodies.

The working design has adopted technical solutions that meet the requirements of sanitary, fire and other standards applicable on the territory of the Russian Federation.

ГСН и ГСВ(Рабочая 70а).dwg