Learn the specifics of explosion vents
Explosion-proof board features and advantages
Flame retardant (burning test for 4 hours), explosion resistance, impact resistance.
Moisture proof and fire protection, earthquake resistance, light weight, corrosion resistance and large format.
Weather resistance (does not change with temperature changes), high resistance, sound absorption, antifreeze.
Edit the area of application of this section of the explosion vent.
Power stations, automobile factories, oil industry, containers, waste recycling centers.
Data protection room, sports ground, military area, laboratory, underground passage, conveyor belt.
Edit the application part of this section of the explosion-proof board.
Ventilation ducts, engineering shields, walls and partitions, flame retardant and smoke areas, cable passages.
Explosion-proof and refractory layers, tunnels.
The reporter learned from the Shanghai Metro Operation Company yesterday that the first major overhaul of the Shanghai Metro train for two years and eight months will be fully completed in late August. The 16 trains with 16 trains serving for more than 10 years will be fully refurbished to reach or close to the new car. Performance of use. Over 10 years, over 5,000 parts must be overhauled
Some components of trains that have been in service for more than 10 years have become aging, making the failure rate of trains on Line 1 significantly higher than those on Lines 2 and 3.
As the longest rail transit line in Shanghai, the first four-row DC trains of Metro Line 1 were purchased in 1992. It has been commissioned for 12 years on the track line since the commissioning, and the service life of the remaining 12 trains has exceeded Some vehicle components that have accumulated to more than 1 million kilometers in 10 years have already become aging, making the failure rate of Line 1 trains significantly higher than Line 2 and Line 3. According to the maintenance requirements of the subway train, in addition to the regular daily inspection, monthly inspection, and fixed repair, the train must undergo an overhaul every 10 years.
The overhaul of the DC train on Metro Line 1 was launched on December 18, 2002. This is the first time Shanghai has completely renovated the subway train. After the overhaul train is sent to the workshop, the technicians dismantle the train, inspect and maintain all the parts and repair the damaged parts. There are more than 5,000 parts to be replaced. The floor is completely replaced, the explosion-proof fireproof coefficient is improved.
Seats and armrests have also been dismantled and sent to professional manufacturers for refurbishment, making passengers feel more comfortable
It is understood that the overhaul of the 15 trains of the No. 1 line has been completed. All the train compartments have been replaced with PVC flame-retardant imported flooring that meets the European DIN 5510 standard. The new floor is not only brightly colored, but also improves the interior decoration quality of the vehicle. The safety factor of fire prevention and explosion resistance of subway trains is further improved. In the process of laying new floors, technicians use the entire floor covering method to make the subway car have better anti-leakage function. At the same time, the seat and armrests have been dismantled and sent to manufacturers specializing in FRP and stainless steel for renovation, which makes passengers feel more comfortable. The technicians of the subway company said that after the overhaul of these 10 years old trains, they must undergo three rigorous tests. In addition to the same appearance and the original car, the same performance will also reach the state of the new car at the time of shipment, which will make the fault pressure in the operation of Line 1. Greatly reduced.
The number of passengers on Line 1 is relatively tight. The MTRC has adopted a column-by-column approach to the overhaul of Line 1 trains. It has cooperated internationally with Bombardier of Canada and has been technically guided by foreign experts. The vehicle was overhauled within one working day, so that the normal operation of Line 1 was not affected.
Tunnel fireproof board fireproof standard
When we understand the characteristics of the fire and the main hazards, how should we purchase safe and qualified building materials for residential decoration and decoration?
I. Classification of combustion performance of building materials and building decoration materials
The burning properties of building materials refer to all physical and chemical changes that occur during combustion or fire. This property is caused by the ignitability and flame spread of the surface of the material, heat generation, fuming, charring, weight loss and toxic products. And other characteristics to measure. China's national standard GB8624-97 divides the combustion performance of building materials into the following grades.
Class A: Non-combustible building materials: Materials that hardly burn.
Grade B1: Flame retardant building materials: Flame retardant materials have good flame retardant effects. When it encounters an open flame in the air or it is difficult to catch fire under the action of high temperature, it is not easy to spread quickly, and the combustion stops immediately after the fire source is removed.
Class B2: Combustible building materials: Combustible materials have a certain flame retardant effect. In the air, when exposed to open flames or under high temperature, it will immediately ignite and burn, which may lead to the spread of fire such as wooden columns, wooden trusses, wooden beams, wooden stairs, etc.
Grade B3: Flammable building materials: no flame retardant effect is extremely easy to burn. The fire is very dangerous.
Second, the correct use of materials with different combustion performance levels
The building materials used in the building shall comply with the requirements of the national mandatory regulations. This is the GB50222-95 "Code for the Fire Protection of Interior Decoration Design of Buildings", which requires "the interior decoration design of the building, which should properly handle the decoration effect and the safety of use." Contradictions, active use of non-combustible materials, and flame retardant materials to avoid the use of materials that produce a large amount of smoke or toxic gases during combustion, to achieve safe and applicable technology advanced and economical." Therefore, when consumers choose building materials or interior decoration materials, they should give priority to non-combustible Class A and flame retardant B1 products to protect their safety while ensuring the quality of decoration.