Bakery in Khanty-Mansiysk, Khanty-Mansi Autonomous Okrug, gas pollution project

1. General provisions.

The project provides for automation and control of the gas content of the equipment for the bread baking workshop.

1.1 Basis for project development and initial data.

The working design was developed on the basis of: contract No. ____ dated ______ and "Technical Assignment" for the development of design documentation issued by the Customer "Langepass Bakery." Source Data:

1. technical assignment from the customer;

2. architectural and planning solutions of the building;

3. Technical specifications of adjacent sections of GSV, EOM, ViK, OM.

The working documentation is developed in accordance with the existing norms, rules and standards, as well as territorial norms and meets the requirements for environmental protection.

The project was executed in accordance with SNiP 23576, SNiP 2.04.0887, SNiP 3.05.0288 ,

RD 1234100, PB12-529-03 and PUE2007.

1.2 Brief description of the object

Object represents one floor monolithic industrial building, to the address: HantyMansiysk, HMAO HHHHH St.

Building height: m.

Total area: 374.6 m.

Toxic and combustible gas leakage area: 104m.

2. Design solutions

The project provides for installation of the Gas Automation Panel. The board is equipped with an automation system based on the controller and equipment of SEITRON Italy, which performs control and alarm functions when the concentration of carbon monoxide is increased by 100mg/m3 or natural gas 10% NKPR CH4.

2.1 Gas content control.

RGY000MBP4 annunciator with four additional sensors for toxic and combustible gases is installed in the bread baking shop room.

The device is designed for continuous monitoring of carbon monoxide and natural gas content with trigger thresholds in accordance with RD 1234100, PB12-529-03.

The RGY 000 MBP4 indicator is designed to measure the pre-explosion concentrations of methane and the volume fraction of carbon monoxide in the air, as well as to indicate the excess of the maximum permissible carbon monoxide concentration and pre-explosion concentrations of methane in the spirit.

The annunciator is a microprocessor device with LCD display and is installed on the DINrack. Sensors with output signal 4... 20mA type SGYME0V4NC for methane detection and SGYCO0V4NC for carbon monoxide detection.

The annunciator can separately monitor the condition of the preliminary and main alarm by controlling each output relay (the relay clock is normally open), refer to sheet 3. When the pre-alarm threshold is triggered on any sensor, the RGY000MBP4 unit activates the pre-alarm relay corresponding to this sensor and starts flashing the red indicator. If the gas concentration in the sensor area continues to rise and reaches the specified threshold of the main alarm, the unit activates the alarm relay, the red indicator starts to burn continuously and the sound signal is turned on.

If the concentration decreases below the threshold values, the relays rotate to the initial state.

2.2 Sensor Functionality

2.2.1 SGYCO0V4NC sensor;

Used to determine the current concentration of carbon-genus monoxide (CO). It is connected from 3 wire cables and has a current output signal in the range 4... 20 mA. The device consists of a plastic housing in which an electronic module is installed, and a sensitive element located in the lower part with a protective filter.

The sensor measures the CO carbon monoxide concentration and converts it to the current current value in the range of 4... 20 mA, according to applicable industrial standards.

Sensitive element - electrochemical type. This ensures good stability and quick availability. When power is supplied, the sensitive element is preheated for 30 seconds, after which the device is ready for operation. However, the highest stability is achieved after 48 hours of operation.

Mechanical and electrical installation of the instrument shall be in accordance with applicable safety standards.

The sensor shall be installed by the sensor element downwards for ease of maintenance and removal of possible condensate.

To correctly locate the sensor, consider the following factors:

● - air flow rate;

● - availability of windows, doors, etc.;

● - room configuration;

● - area of the room.

Since carbon monoxide has the same density as air, the sensor must be installed at a height of 1.5... 1.8 m from the sex level (average human growth).

Electrical connections are made with copper 3-wire cable. The signal cable shall be installed separately from the 220V cable.

2.2.1.1 Technical characteristics:

Supply voltage: 12B-

Current consumption: 45 mA

Detectable gas: Carbon monoxide (CO)

Sensor type: Electrochemical

Output: 4... 20 mA

Sensitivity range: 0... 200 ppm

Clean air displacement: 5% of signal per year

Response time: < 150 sec

Degree of protection: IP54

Operating temperature: 0 ° С... + 40 ° С

Storage temperature: 10 ° С... + 50 ° С

Operating humidity: 20%... 80% (no condensate)

Dimensions: 155x107x62 mm

Weight: ~ 480 gr.

2.2.2 SGYMEOV4NC sensor;

The natural gas gas sensor SGYME0V4NC is a three-wire transmitter with a current output signal 4... 20 mA.

The device has a strong housing with a degree of protection IP54, in which an electric board and a sensitive element are built in, which is reliably protected by a filter located at the bottom of the housing.

The instrument measures the concentration of methane in the range for which it is calibrated and converts it into a current signal from 4.0 to 20.0 mA, which meets current standards.

Sensor uses sensitive element of catalytic principle of action. If the gas content is lower than the Lower Concentration Propagation Limit, the sensitive element of this type has good reliability and stability. In addition, it has low sensitivity to other environmental parameters, such as temperature and humidity.

Since the sensor can sense several types of hydrocarbons at the same time, it is necessary to take into account this sensitivity to other gases.

After voltage supply, the device is ready for operation after 30 seconds of preliminary heating, but maximum stability is achieved after 48 hours of operation.

In order for the device to give the correct readings, it is necessary to fully verify that there is enough oxygen in the controlled room, that is, about the same as in the atmosphere (20.9%).

The instrument shall be installed by the sensor element downwards for ease of maintenance and automatic removal of possible condensate.

To correctly determine the location inside the controlled space, consider the following factors:

- gas characteristics (heavy or light);

-airflow rate;

- possible slits in walls and ceilings;

- room configuration;

- room area.

For light natural methane gas, the sensor should be installed at the top of the room at a height of 1020 cm from the ceiling above the places of possible leakage, in places convenient for maintenance.

Electrical connections are made with copper 3-wire cable.

The signal cable shall be laid separately from the 220V cable.

2.2.2.1 Technical characteristics

Supply voltage: 12V = 15%... 24V = + 10%

Current consumption: 80mA

Detected gas: methane (CH4)

Sensor type: catalytic

Output: 4... 20 mA

Sensitivity range: 0... 50% NKPR

Clean air displacement: 5% of signal per year

Response time: < 30 sec

Degree of protection: IP65

Operating temperature: 0 ° С... + 40 ° С

Storage temperature: 10 ° С... + 50 ° С

Operating humidity: 20%... 80% (no condensate)

Sizes: 135х101х72 mm

Weight: ~ 767 g.

2.3. Valve operation:

To cut off the gas supply from the gas supply system, the design provides for the installation of an electromagnetic valve with a manual cocking of the EVG NC type by SEITRON (normally closed).

After supplying power to the power supply and control unit RGY000MBP4, voltage is also supplied to the solenoid cover of the normally closed valve through contacts 15-16 of the auxiliary relay.

In case of carbon monoxide gas gas, contacts 15-16 of the auxiliary relay open, voltage drops from the solenoid coil of the valve and it closes. Contacts 16-17 are closed, and the sound alarm "Alarm" sounds.

At the same time, contacts 21-22 or 26-27 of the main alarm zone relays are closed, thereby including the "CO Gas" light indication on the dispatcher panel. After disappearance of gas content contacts 21-22 or 26-27 of zone relays of main alarm and 16-17 of auxiliary relay are opened.

"CO gas" indication goes OFF and "Alarm" sound alarm is silent. Contacts 15-16 of auxiliary relay are closed and voltage is supplied to solenoid valve coil. But to open the normally closed valve, you need to take it manually.

In case of gas contamination by natural gas, contacts 15-16 of auxiliary relay open, voltage disappears from solenoid coil of valve and it closes. Contacts 16-17 are closed, and the sound alarm "Alarm" sounds.

At the same time, contacts 45-46 or 50-51 of the main alarm zone relays are closed, thereby, including the "CH4 Gas" light indication on the dispatcher panel. After disappearance of gas content, contacts 45-46 or 50-51 zonal relays of head alarm and 16-17 auxiliary relays are opened.

Indication "Gas contamination of CH4" dies away and the sound Alarm alarm system stops. Contacts 15-16 of auxiliary relay are closed and voltage is supplied to solenoid valve coil. But to open the normally closed valve, you need to take it manually.

2.3.1 Technical characteristics:

Medium non-aggressive gases

Supply voltage: 230B ~, 24B ~, 12B ~

Power consumption: Du15-50 - 9W

Closing time: < 1 second

Maximum pressure: 500 mBar - 6 Bar

Filter element: steel mesh (DU 25-200)

Operating temperature: -15 ° С... + 60 ° С

Tightness class: A

Degree of enclosure protection: IP65

2.4. Gas Alert:

A siren sound device with ACCSRL flashing light from SEITRON is installed to supply the gas content signal.

2.5 Laying of information line:

The information line is a 3x0.5 KVGeng cable, which is laid in a metal tray without a cover. A corrugated IPA pipe is used to protect the cable laid up to the sensors.

2.6. To protect the equipment of the automatic gas content control system from short circuits and overloads, install a single-phase circuit breaker at the input at 6A.

3. Tray device.

For cable laying, the project provides for the installation of the OSTEC Russia cable metal tray system. The C-system of OSTEC trays meets the requirements of GOST 2080381, GOST 2078381 and is certified according to the following characteristics:.

- protection class: IP20 (trays imperforated with covers);

- fire resistance class: NG, R 30

3.2. Cable Tray System to Support and Backplanes

wiring and cable lines.

3.3 Cable tray system is made of sheet and roll

cold rolled steel of 08 PS grade galvanized by hot method

in continuous galvanizing units according to the Sendzimir method (GOST 1491880).

3.4. Cable tray system corresponds to climatic type

execution "Y" of placement category "3" (GOST 15150).

3.5. Cable tray system can be used

as a protective PE conductor.

3.6. The cable tray system consists of:

- metal trays for electrical wiring;

-metal cables for electrical wiring;

-consteins wall-ceiling;

- accessories to trays.

4. Installation works:

4.1. For installation and maintenance of the system, persons who have undergone safety training are allowed. Passing the briefing is noted in the journal.

During installation works comply with the requirements of SNiP 111480 Safety in Construction, Rules for Operation of Consumer Installations, Safety Rules for Operation of Electric Installations of Consumers of the State Energy Supervision.

4.2. During construction and installation works, the workstations of the installers must be equipped with devices that ensure the safety of the work.

When working with electrical installations, hang warning posters.

4.3. Perform electrical works in operating units only after voltage removal.

4.4. Commissioning shall be carried out in accordance with requirements

SNiP 3.05.06.

5 Power supply and earthing:

5.1 Power supply of SEITRON gas supply system shall be performed in accordance with "Electrical Installation Rules" (PUE), from designed AC network with voltage of 220V, frequency of 50Hz. Install the power supply circuit of the device with 3x1.5 VVG cable from the main electrical panel with separation into a separate group and installation of the automatic circuit breaker. Lay the cable in the pipe of IPA D16 corrugation.

5.2 Grounding (grounding) shall be performed in accordance with the "Electrical Installation Rules" (PUE), SNiP 3.05.06.85 "Electrical Devices," the requirements of GOST 12.1.3081 and technical documentation of manufacturers of components.

5.3 All metal parts of electrical equipment that are not formally energized, but which may be under it, due to failure of insulation, shall be grounded (grounded). The potentials must be balanced. The resistance of the grounding device must be not more than 4 ohms. The latter shall be provided by the Customer.

6. Occupational safety requirements:

6.1 Installation works shall be carried out by a specialized organization, in strict accordance with the applicable norms and regulations for the installation, testing and commissioning of alarm units RD 78.14593.

6.2 Start installation and installation works after safety measures as per SNiP 111480. And the incoming control act.

When working with the power tool, it is necessary to ensure compliance with the requirements of GOST 12.2.013-87