Qualification for installing and servicing explosion-proof equipment

Jiangxi Wanlong Industrial Co., Ltd. has received a qualification for the installation, maintenance and repair of explosion-proof equipment. Certificate PCEC-2024-BC004 covers two equipment categories: explosion-proof vapour-recovery units and explosion-proof instruments. It is valid from May 2024 to May 2027.

Why this qualification matters

Fuel stations and refuelling skids work in hazardous areas, where fuel vapour can form an explosive atmosphere. Electrical equipment in these areas must be explosion-protected, and it must be installed and serviced correctly to keep that protection.

Our skid-mounted refuelling units carry this kind of equipment. The JY-10, JY-20 and JY-30 units for petrol and diesel use dispensers rated Ex d IIA T4. The JYQ-20 unit for CNG and LNG is rated Ex d IIB T3. The configuration includes:

• SF double-wall tank
• Vapour recovery unit
• Explosion-proof dispenser
• Submersible pump
• Level gauge
• Emergency shut-off valve
• Fire-fighting equipment
• Intelligent control system

What the certificate covers, and what it does not

• Covered: installation, maintenance and repair of explosion-proof vapour-recovery units and explosion-proof instruments.
• Not covered: other categories of explosion-proof equipment. The certificate is a service qualification, not a product certificate for any device.

When you specify a refuelling skid, state the hazardous-area classification and the explosion-protection marking your authority requires. They can then be checked against the equipment list before fabrication.

In these markings, Ex d means a flameproof enclosure, IIA and IIB are gas groups, and T4 and T3 are temperature classes. The marking must suit the gases present and the area classification at the site.

How it fits with our other work

The same equipment sits on SF double-wall underground tanks at fuel stations, which we also fabricate. Our SF range runs from SF-10 to SF-50, 10 to 50 m³, with a 6 mm Q235B inner tank and a 6 mm FRP outer tank, manufactured to SH/T 3178. Our UL 1746 certificate is 20161115-MH61687, for jacketed underground tanks for flammable liquids, issued 2016.

Skid piping falls under our special equipment production licence TS3836019-2027 for GC2 industrial piping installation, valid to 2027-04-14. Skid frames are welded to qualified WPS/PQR, blasted to Sa 2.5 and coated with epoxy zinc-rich primer and polyurethane topcoat.