MT/T 696-1997General technical condition of high-ratio-foam fire extinguisher equipment for coal mine (English PDF)

1 Scope 1

2 Normative references 1

3 Definition 1

4 Classification 1

5 Technical requirements 2

6 Test method 3

7 Inspection rules 4

8 Marking, packaging, transportation, storage 4

Appendix A (Appendix to the Standard) Technical Requirements for Use 6

General technical requirements for high-expansion foam fire extinguishing devices for coal mines

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, signs, packaging, transportation and storage of high-expansion foam fire extinguishing devices for coal mines.

Save, etc.

This standard applies to high-expansion foam fire extinguishing devices for coal mines (hereinafter referred to as high-foam devices).

2 Reference standards the following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards.

GB 191-90 Packing, storage and transportation icon GB 3836.1-83 General requirements for explosion-proof electrical equipment for explosive environments GB 3836.2-83 Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "d" GB 3836.3-83 Explosion-proof electrical equipment for explosive environments Increased safety electrical equipment "e" JB8-82 Product label JB2759-80 General technical requirements for packaging of mechanical and electrical products

3 Definition

This standard uses the following definition.

3.1 foam water contentoffoam Water content per unit volume of foam.

3.2 Windtofoamratio

The ratio of the volume of air consumed to the volume of foam used to generate foam

3.3 Foamingfoamratio the foam extinguishing agent solution (hereinafter referred to as foam solution) that can form foam in the foam extinguishing agent solution consumed by the high-holding device percentage.

3.4 Negativ pressuremixer it is a pump using the Venturi jet principle. The pressure water is sprayed from the nozzle, and the water flow is caused by the nozzle effect and the high-speed jet.

A vacuum is generated in the surrounding area, and the foam solution is sucked in through the drug delivery tube and mixed with water, and then sprayed by a negative pressure proportional mixer. Is to suck foam and form the main component of foam.

3.5 Driving pressure drivingpressue the pressure used to push the bubble forward.

4 Classification

4.1 Classification by driving method.

--- Electric drive;

--- Hydraulic drive.

4.2 Classification by foaming volume.

--- Large, foaming volume above 500m3/min;

--- Medium, foaming volume is 100m3/min ~ 500m3/min;

--- Small, foaming volume is below 100m3/min.

5 Technical requirements

5.1 High-bubble devices shall comply with the provisions of this standard and shall be manufactured in accordance with the drawings and technical documents approved by prescribed procedures.

5.2 Use environmental conditions.

The inert gas device should work normally under the following conditions.

--- Temperature. -5 ~ 40 °C;

--- Relative humidity. 98%;

--- Atmospheric pressure. 86 ~ 106kPa.

5.3 The high foam device consists of a foaming system and a foam solution system.

5.4 General requirements.

5.4.1 The electrical equipment used in high-bubble devices shall comply with the relevant explosion-proof regulations in GB 3836.1, GB 3836.2 and GB 3836.3.

Claim.

5.4.2 The coating and plating of high-bubble devices shall be uniform without blistering, cracking and peeling.

5.4.3 The foaming system should generally consist of a foaming net, a nozzle, an air supply device, a pressure gauge and a water column meter.

5.4.4 The foaming net should be composed of two layers of wire mesh with a distance of 20mm ~ 30mm. The net bar should be made of cotton thread, and the outer layer diameter is 2mm × 2mm, the inner hole diameter is 4mm × 4mm.

5.4.5 Air flow and liquid flow shall be evenly distributed on the net surface.

5.4.6 The structure of the nozzle should ensure that it is not easy to block, and the spraying should be uniform. Its installation position must be in the center of the foaming device.

5.4.7 The foam solution system should be well sealed and properly sealed.

--- When driven by electric power, it includes submersible pumps, water filters, water pipes, negative pressure proportional mixers and suction pipes;

--- Hydraulic drive includes pressure water pipes, negative pressure proportional mixers and suction pipes.

5.4.8 The foam outlet of the high foam device should be provided with an interface to the water column gauge above 5cm ~ 10cm.

5.4.9 A damper or a tight cover can be installed at the inlet of the high-bubble device.

5.5 Performance requirements.

5.5.1 Water consumption should meet the requirements specified in the corresponding product standards.

5.5.2 Use foam solution concentration percentage should be 3% ~ 6%.

5.5.3 Foaming amount it shall meet the requirements of the corresponding product standards and be calculated according to formula (1).

Where.

QP --- foaming volume, m3/min;

Qf --- Air supply volume of the corresponding model, m3/min;

K --- wind bubble ratio.

5.5.4 Air bubble ratio should be 1.1 to 1.3 times.

5.5.5 Foam multiple

Should be 500 times to 800 times.

5.5.6 Foam stability should not be less than 30min.

5.5.7 Foaming rate

Should be greater than 95%.

5.5.8 Pressure of foam solution.

--- The water pressure at the inlet of the negative pressure proportional mixer should not be less than 0.3MPa;

--- The pressure at the nozzle of the spray foam solution should not be less than 0.15MPa.

5.5.9 Driving foam pressure the driving pressure for conveying foam in a horizontal roadway should not be less than 1kPa.

6 Test method

6.1 Test environmental conditions.

--- Water should be free of impurities;

--- Ambient temperature is 15 °C ~ 45 °C;

--- Relative humidity is 70%;

--- The wind speed is within 5m/s.

6.2 Test tools.

--- Stopwatch with a minimum division value of 0.2s;

--- Steel tape measure, measuring range. 2m, error. ± 2mm;

--- graduated cylinder,.200mL;

--- Pressure gauge, 0 ~ 0.6MPa;

--- Water column pressure gauge, range. 0 ~ 5000Pa.

6.3 Explosion-proof performance The explosion-proof inspection unit designated by the Ministry of Coal Industry shall perform the corresponding method.

6.4 In addition to the flameproof performance of the general requirements, use sensory and measuring tools to check.

6.5 Machine performance test.

6.5.1 Water consumption measurement Measure the amount of water consumed over a period of time.

6.5.2 Determination of percentage of foam solution concentration Measure the ratio of the amount of foamed liquid consumed to the total amount of water and foamed liquid consumed in a certain period of time.

6.5.3 Determination of foaming amount when the foam device is working normally, lead the foam into the container or enclosed space, record the foaming time with a stopwatch, measure with a steel tape Calculate the foam volume.

6.5.4 Determination of air bubble ratio Calculated according to the ratio of product air supply volume and foaming volume measured in 6.3.3.

6.5.5 Determination of foam multiple when the foam device works normally, the generated foam is filled in a cylindrical container with a volume of 0.3m3 made of plexiglass.

The volume of the stored liquid was measured with a graduated cylinder after all the foam in the container had burst. Calculate the volume of the container and the measured liquid volume Ratio.

6.5.6 Determination of foam stability Record that from the time when the 0.3m3 cylindrical container in 6.5.5 is fully filled with foam until the foam bursts, its volume is reduced to half.

time.

6.5.7 Determination of foaming rate Calculate the ratio of the volume of foam solution forming foam to the volume of total foam solution consumed.

6.5.8 Supply Foam Solution Pressure Use a pressure gauge to measure the water pressure at the inlet of the negative pressure proportional mixer and the pressure before spraying the foam solution.

6.5.9 Driving foam pressure measurement Read the pressure value of the water column gauge installed on the interface specified in 5.4.8.

7 Inspection rules

Inspection is divided into factory inspection and type inspection.

7.1 Factory inspection

7.1.1 The quality inspection department of the manufacturer shall conduct the inspections one by one, and the products shall not be delivered until the inspection is qualified and a certificate of conformity is issued.

7.1.2 The inspection items at the factory shall be as specified in Table 1.

Table 1

Technical requirements for inspection items

1 Overall machine appearance, manufacturing and assembly quality inspection 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.4.10 delta delta

2 Explosion-proof performance 5.4.1-delta

3 Water consumption 5.5.1 delta delta

4 Use foam agent concentration percentage 5.5.2-delta 5 foaming amount 5.5.3 delta delta

6 Air bubble ratio 5.5.4-delta

7 Foam multiple 5.5.5 delta delta

8 Foam stability 5.5.6-delta

9 Foaming rate 5.5.7-delta

10 Foam liquid pressure 5.5.8 delta delta

11 Foam drive pressure 5.5.9-delta

Note. "delta" is the item to be inspected.

7.2 Type inspection

7.2.1 Type inspection should be carried out in one of the following situations.

--- When new products are identified or old products are transferred to the factory for production;

--- After normal production, if there are major changes in structure, materials, and processes, which may affect product performance;

--- Normal production should be carried out once every two years;

--- When re-production after 1 year of suspension;

--- When the factory inspection results are significantly different from the last type inspection;

--- When the national quality supervision agency requests the type inspection.

There is one prototype for type inspection, one is prepared. Such as a non-conforming inspection machine, if there is a failure, the batch of products is judged to be unqualified.

7.2.2 Type inspection items shall be as specified in Table 1.

8 Marking, packaging, transportation, storage

8.1 Logo

8.1.1 Product Marking

8.1.1.1 The high-foam device shall fix the product label at an obvious location, and its type, size and technical requirements shall comply with the provisions of JB8.

8.1.1.2 The product label shall include the following.

--- product name and model;

--- foaming amount;

---Water Consumption;

--- driving pressure;

--- Power power, voltage;

---Serial number;

---Date of manufacture;

--- Manufacturer name.

8.1.2 Outer packaging mark

8.1.2.1 The outer packaging box should be printed with the shipping mark at the appropriate position.The domestic shipping mark must have the following.

--- product name and model;

--- product quantity, weight or volume;

--- packing date;

---Receiving Unit.

8.1.2.2 The markings on the outer packaging shall comply with the provisions of 1, 3, 7, 10, 11 and 12 of GB 191.

8.2 Packaging

8.2.1 The product's factory packaging shall comply with the provisions of JB2759.

8.2.2 The sections of the high-foam device are tightly covered with plastic cloth, and the ropes are tightly packed into the box.

8.2.3 Place the inner parts of the box with cardboard pads and support with wooden boards.

8.2.4 Packing tools, accessories, spare parts and random technical documents must be protected from rain and moisture.

8.3 Transport

8.3.1 Suitable for iron, public and water transportation.

8.3.2 Avoid strong impact and collision during transportation.

8.4 Storage

8.4.1 The high-foam devices packed into boxes should be stored in a well-ventilated warehouse.

8.4.2 The stacking of high-foam devices packed in boxes should not exceed two pieces, and the unpacked high-foam devices are not allowed to be stacked or placed on top of them.

Heavy object.

8.4.5 After each use, the foam net should be cleaned and dried for storage. The submersible pump sucks clean water to wash away the residual chemical solution in the pump.

Appendix A

(Standard appendix)

Use technical requirements A1 When a high-bubble device is installed and used in a mine, the methane dust concentration in the surrounding environment should be controlled within the range specified in the Coal Mine Safety Regulations.

Inside; there should be power and water sources suitable for its product model; the cross section of the roadway should not be less than 4m2; the air supply volume should be greater than the corresponding model of the high-bubble device Air supply is 1.3 times.

A2 When using a high-foam device, a closed panel wall should be established at the exit of the high-foam device.

Be sure not to leak.

A3 Before using a high-foam device to extinguish a fire in a well, all branches and alleys between the fire source and the high-foam device should be closed.

A4 High foam devices should be installed in a safe place as close to the fire area as possible.

A5 After the fire is extinguished with a high expansion foam, if the remnant fire re-ignites, you can use a water gun and other tools to extinguish the remnant fire under the cover of the foam.

A6 After using the high foam device, the foam net should be cleaned and dried for storage; the submersible pump should pump clean water to wash away the residual chemical solution in the pump.

A7 High multiple foam fire suppression technology is not suitable for extinguishing live electrical fires.