When testing flammable and explosive medium storage tanks, the explosion-proof design of the breathing valve tester is crucial, which is directly related to the safety of the testing work and the safety of the surrounding environment.
First of all, electrical explosion-proof is one of the core points. The electrical system of the tester should adopt an intrinsically safe design, which means that the energy in the circuit should be limited so that the electric sparks and thermal effects generated under normal operation or specified fault conditions cannot ignite the surrounding flammable and explosive gases. For example, for the power supply, sensor, control circuit and other components of the tester, the voltage, current and power of the circuit should be limited to a safe range by reasonably selecting electrical components, optimizing circuit design and adopting reliable insulation measures. At the same time, all electrical equipment should have good grounding to ensure that the static electricity that may be generated can be discharged in time to prevent the accumulation of static electricity from causing sparks.
Secondly, the shell protection is an important explosion-proof barrier. The shell of the breathing valve tester should have sufficient strength and sealing to prevent external flammable and explosive gases from entering the tester, and also prevent the sparks or high-temperature substances that may be generated inside from leaking to the external environment. High-strength explosion-proof materials such as cast aluminum or stainless steel are usually used to manufacture the shell. The structural design of the shell must comply with relevant explosion-proof standards. For example, a flameproof structure can be used. By increasing the thickness of the shell and reducing the gap of the joint surface, the flame and pressure generated by the internal explosion can be effectively suppressed and attenuated before they spread to the outside.
Furthermore, the explosion-proof design of the sensor cannot be ignored. Since the sensor is in direct contact with the measured medium or the surrounding environment, its explosion-proof performance directly affects the overall safety of the tester. For sensors that detect flammable and explosive media, explosion-proof sensors, such as intrinsically safe or flameproof sensors, should be used. These sensors are designed to work safely and reliably in flammable and explosive environments through special circuit protection and packaging technology. For example, an isolated sensor is used to isolate the sensitive element of the sensor from the electrical part to avoid the energy generated by the electrical part from causing an explosion.
In addition, the operating interface of the tester also needs to be designed to be explosion-proof. The operating interface should adopt a spark-free or low-energy operation mode, such as a capacitive touch screen or a sealed button. At the same time, the display part of the operating interface should adopt an explosion-proof display screen to ensure that no energy sufficient to ignite flammable and explosive gases is generated under any circumstances. For example, a display screen with explosion-proof glass protection is used, and the electrical connection of the display screen is strictly sealed and protected to prevent external gas from entering.
In explosion-proof design, the cable entry device also plays a key role. The cable is an important channel for connecting the various components of the tester and communicating with external equipment. The sealing and explosion-proof performance of the cable entry device must be ensured. A special explosion-proof cable entry device, such as a stuffing box or a cast-in cable entry device, is used to reliably seal the cable and the outer shell of the tester to prevent flammable and explosive gases from entering the tester along the cable. At the same time, the cable should be reasonably routed and fixed to avoid damage to the cable due to external pulling or friction, which may cause safety hazards.
In addition, the tester should also be equipped with a reliable explosion-proof alarm device. When the tester detects an abnormal situation, such as an excessive concentration of flammable and explosive gases or an internal fault that may cause an explosion hazard, the alarm device should immediately send out an audible and visual alarm signal to remind the operator to take corresponding safety measures. The alarm device itself should also have explosion-proof performance, and use explosion-proof speakers and indicator lights to ensure normal operation in flammable and explosive environments.
Finally, the explosion-proof design of the breathing valve tester also needs to consider the connection method with the tank. The connection parts should use explosion-proof quick connectors or flanges to ensure that the connection is firm and well sealed to prevent leakage of flammable and explosive media during the test. At the same time, the material of the connection parts should match the tank and the tester to avoid problems such as electrochemical corrosion that affect the reliability and safety of the connection.
The explosion-proof design of the breathing valve tester in the detection of flammable and explosive medium tanks involves many aspects, from the electrical system to the shell protection, from the sensor to the operation interface, each link needs to strictly follow the relevant explosion-proof standards and specifications to ensure that the tester can operate safely and reliably in a hazardous environment and ensure the safety of personnel and equipment.
