Have you heard of gas station display screens that can be used as bulletproof glass? An investigation report on an explosion accident at a chemical plant last year showed that the cause was that the ordinary screen in the control room produced an electric spark. What kind of display should be used in such a deadly place? Today, let’s talk about this unpopular but life-saving knowledge - from oil and gas warehouses to flour workshops, choosing the wrong screen will really be fatal.

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​​1. Explosion-proof screen is not an iron box. These certifications are life-saving symbols.​
Don't be fooled by the saying "metal shell = explosion-proof"! The most scammed case I have ever seen: The "explosion-proof screen" purchased by a certain oil field is actually just a thickened aluminum alloy frame. The result:

• The oil and gas mixture is not tightly sealed at the interface
• A visible arc is generated when the cooling fan rotates
• Static accumulation causes the control board to burn spontaneously

​​A must-have three-piece set for true explosion-proof screen:​

1. ​Explosion-proof certification number​: For example, Ex d IIB T6, a heavenly book-like code (represents that dangerous gases such as methane and ethylene are applicable)
2. ​​Integrated casting process​: Uncover any exposed circuits if you remove the shell (seal like the waterproof glue of a mobile phone)
3. ​​No mechanical switch design​: All operations must be controlled remotely (physical keys are hidden dangers)

Lessons from blood and tears: Let the seller demonstrate on-site demonstration using a lighter to burn the screen interface, and the true explosion-proof screen should be unresponsive.

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​​2. The details of the procurement anti-pit guide are to be watched by life.​
Do you think everything will be fine if you get the test report? A "explosion-proof screen" bought by a coal mine last year was discovered only after an accident:

• The report corresponds to the old model
• The actual shipment of the heat dissipation module has shrunk by 40%
• Control software version is incompatible with security system

​​Trade life and death line:​

1. Require to view the attachment of the explosion-proof certificate (focus on explosion-proof signs and temperature groups)
2. Measure the working temperature (the surface does not exceed 85℃ after running for 2 hours)
3. Test the static dissipation rate (with friction balloons close to them and do not adsorb within 2 seconds)

Key reminder: The contract must indicate "explosion-proof grade matching the usage environment". Youjia liquefied gas station relies on this to find that the supplier mismatched the special screen for hydrogen environment.

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​​3. Fallen details of installation and maintenance are completely ruined​
The most outrageous installation team I have ever seen: installing the explosion-proof screen directly under the pressure relief port, and the result:

• Explosion shock wave directly shatters the screen
• During daily maintenance, tools fall off and smash the sealing layer
• Emergency indicator light is blocked by the screen

​Life-saving installation rules:​

• At least 3 meters away from the hazardous source (refer to the width of the fire passage)
• The bearing capacity of the bracket must be twice as high as the screen weight (prevent shock wave vibration)
• The wiring port must be facing downward (prevent liquid from seeping in)
• Clean the heat dissipation holes with explosion-proof vacuum cleaner every week

Cold knowledge: The screen installed on cement walls has a lifespan of 5 years longer than that of steel structure walls, because metal conducts too fast heat and affects components.

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​​A self-questioning core questions​
Q: Why is the price difference between explosion-proof screens of the same size more than 100,000 yuan?
A: The explosion-proof method may be poor. For example, the cast sealing type is 30% cheaper than the explosion-proof type, but it can only be used in low-risk areas. Teach you how to identify: there are jagged explosion-proof patterns at the joints of the explosion-proof screen.

Q: Can you buy a second-hand explosion-proof screen?
A: It’s more dangerous than buying a second-hand bomb! Explosion-proof qualifications are usually valid for 5 years, and each screen has an independent file. There is a trick: check whether the screen steel stamp number can be verified in the safety supervision system.

Q: How to deal with the emergency when the screen suddenly becomes black?
A: Start the backup mechanical instrument first, then wait for 1 hour before checking (let the combustible gas dissipate). Never unbox the box for inspection with electricity. This is how an accident in a power plant last year was caused.

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​​The secret that only the old fried dough knows​​

1. Scan the screen with an infrared thermal imager every month (stop immediately after local overheating)
2. Prepare two sets of control systems from different manufacturers (prevent the system from crashing and completely paralyzing)
3. Unplug the signal cable before thunderstorm to retain power (lightning protection and maintain basic functions)
4. Check the explosion-proof sealant strip during shift handover (replace immediately after aging and hard work)

To be honest, you really can't save money on buying explosion-proof screens. Remember the chemical plant explosion that shocked the whole country? Afterwards, it was found that if you spent 80,000 yuan to buy a real explosion-proof screen, you could avoid 920 million losses. This money is better than spending on the screen than paying for pensions!

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