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In the field of explosion-proof certification technology, the application of explosion-proof technology in various oil and gas locations is quite extensive, especially in various fuel dispensers, fuel guns, fuel vehicles, refueling sites, etc. Below, Zhongnuo Testing will briefly introduce the explosion-proof certification technology for fuel dispensers.
A fuel dispenser is generally composed of a complete device for measuring liquid volume, which is mainly composed of an oil pump, an oil-gas separator, a measuring transformer, a counter, an indicator device, an oil sight, an oil gun, and other main parts.
Common fuel dispensers can be divided into two parts: electrical and non electrical:
The electrical part mainly includes:Power and control board, computer control motherboard, keyboard, display board, metering sensors, motors, solenoid valves, oil gun switches, and lighting fixtures, etc.
The non electrical components mainly include:Oil pump, oil-gas separator, flow meter, sight glass, oil gun, casing, and oil pipeline, etc.
The explosion-proof electrical equipment of fuel dispensers mainly includes intrinsic safety equipment and intrinsic safetyAssociated devicesExplosion proof electrical equipment, sealed electrical equipment, andIncreased safety typeElectrical equipment.
As an explosion-proof system, fuel dispensers should undergo comprehensive explosion-proof inspections on related explosion-proof electrical equipment, mechanical equipment, wiring, and their interconnections, and obtainExplosion proof whole machineA certificate of conformity is necessary to ensure the overall safety of the fuel dispenser. This requires all explosion-proof components to be individually designed or treated for explosion-proof purposes. Including data collectors, encoders, liquid level switches, etc. applied to fuel dispensers.
So the entire fuel dispenser is like a composite explosion-proof product made up of many explosion-proof components, with multiple functions.
What are the characteristics of explosion-proof technology for composite explosion-proof fuel dispensers?
1Electrical equipment or components with composite explosion-proof type requirements should also meet the different requirements involvedExplosion proof typeThe standard requirements.Explosion proof power box with both explosion-proof performance and intrinsic safety related circuit performance,Strictly followGB/T 3836. 2andGB/T 3836. 4Standard review and inspection,Achieve the corresponding explosion-proof level.
2The wiring of the whole machine should be inspected for intrinsic safety wires(Or cable)Non intrinsic safety wires(Or cable)Separate arrangements should not be mixed.
3Intrinsic safety circuits that are located in the same enclosure or junction box as non intrinsic safety circuits should be marked with blue terminal blocks or labeled with intrinsic safety markings near the terminals.
4The cables used for introducing and extracting explosion-proof equipment should be solid core cables, and the outer diameter of the cable should match the inner diameter of the sealing ring to ensure its compression and sealing. To prevent explosion transmission through the gaps between multi-core cable cores, the two ends of the cable must be strictly sealed. Check if there are blind pads on the unconnected inlet device.
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