Overhead Crane Configurations for Paint & Coating Manufacturing
Paint & coating manufacturing (resin reactors 3–15 t/unit, bead mills 1–5 t/unit, filling machines 1–3 t/unit) is a critical industry requiring both explosion-proof and corrosion-resistant handling equipment. Class A explosion-proof zones (toluene/xylene/ethyl acetate) demand full-range ExdⅡBT4 certification. Recommended configuration: explosion-proof QD 5–10 t + explosion-proof KBK 2 t + standard LD 1–3 t. Kelude's coating industry solutions are configured by explosion-proof zone classification.
Paint and coating manufacturing is classified into hazardous areas per GB50058: the resin synthesis area (Zone 0/1), pigment grinding area (Zone 2), and solvent storage tank area require explosion-proof cranes; the filling and packaging area is a general area where standard-duty cranes are acceptable. Class A warehouses prohibit crane installation entirely (explosion-proof forklifts only). A firewall separates explosion-proof zones from general areas. This article provides crane configurations by zone classification.
Resin Synthesis Zone (Ex-Proof): Reactor Installation & Replacement
Resin reactors (3–15 t/unit, 316L stainless steel or glass-lined) are located in the Class A explosion-proof zone. Solvent vapors (toluene/xylene/ethyl acetate) can reach the lower explosive limit. Reactors require periodic replacement of the agitator mechanical seal (every 1–2 years) and glass-lined layer repairs. Wire rope is prohibited for hoisting (spark risk) — use copper wire rope or stainless steel explosion-proof lifting slings instead.
Recommended model: Explosion-proof QD type double-girder bridge crane, 5–10 t / span 12–18 m (ExdⅡBT4 full range: motor, electrical cabinet, limit switches, and controls all explosion-proof). Fitted with a spark-free copper alloy hook + stainless steel explosion-proof lifting sling + positive pressure control box. A C-type explosion-proof lifting spreader is used for reactor replacement.
Price reference: Explosion-proof QD 5 t approx. $14,800–$26,700 per unit (60–80% more than standard duty). Kelude's resin solution includes the Explosion Proof Certificate, nameplate, and 3C certification.
Pigment Grinding Zone (Ex-Proof): Bead Mill & Three-Roll Mill Maintenance
Grinding equipment (bead mills at 1–5 t/unit, three-roll mills at 2–8 t/unit) operates in Explosion-proof Zone 2. Zirconia beads inside the bead mill grinding chamber (500–2,000 kg) are replaced 1–2 times per year. Pigment dust (titanium dioxide/CB) poses an explosion hazard. During maintenance, lifting spreaders must be anti-static (surface resistance 10⁶–10⁹ Ω).
Recommended model: Explosion-proof KBK flexible crane, 2 t (ExdⅡBT4), with stainless steel hoist and anti-static lifting spreader. A C-type bracket is used for bead mill chamber replacement. Three-roll mill rollers (300–1,000 kg each) are handled with a dedicated rubber-coated spreader to protect the roller surface.
Price reference: Explosion-proof KBK 2 t: approx. $8,900–$17,800 per unit. Kelude's pigment solution includes an anti-static spreader, chamber bracket, and Explosion Proof Certificate.
Filling & Packaging Area (General Zone) — Filling Machine Installation
The filling area (filling machines at 1–3 t/unit) is a general zone, kept at a minimum fire separation distance of 10 m from explosion-proof zones. Filling accuracy: ±1 g to ±5 g. Hopper: 316L Stainless Steel, 200–500 kg. Filling speed: 20–60 containers per minute.
Recommended model: LD Type single-girder electric crane, 1–3 t, Span 8–12 m, Standard configuration. A Pneumatic balancer (50 kg) is used for filling head Assembly. Finished-product palletizing is handled by a robot (no crane required).
Price reference: LD single girder, 1 t: approx. $3,000–$5,900 per unit. Kelude's filling solution is configured as Explosion-proof or Standard type according to the zone classification.
Crane Configuration Guide for the Coatings Industry (by Explosion-Proof Zone)
| Area | Explosion Protection Class | recommended model | tonnage | reference price |
|---|---|---|---|---|
| Resin Synthesis | 0Zone/1Zone ExdⅡBT4 | Explosion-proof QD+copper alloy Hook | 5~10t | 10~1810,000 |
| Pigment Grinding | 2Zone ExdⅡBT4 | Explosion-proof KBK+anti-static Lifting spreader | 2t | 6~1210,000 |
| Filling & Packaging | Non-General Area Explosion-proof | Standard LD+Gasdynamic balancing | 1~3t | 2~410,000 |
| Class AWarehouse | 0Zone/1Zone | Prohibited Installationcrane | — | — |
Kelude Service Advantages for the Coatings Industry
Kelude Heavy Industry configures every crane for paint and coatings facilities strictly by hazardous area classification — full ExdⅡBT4 range for explosion-proof zones, standard models for general areas, each delivered with an Explosion-Proof Certificate and a zone-configuration drawing.
Full Explosion-Proof Range
QD, KBK and LD models all available in ExdⅡBT4 with non-sparking copper alloy hooks and anti-static lifting slings, certified to national explosion-proof standards.
Zone-Based Configuration Planning
Crane explosion protection classes are matched to the hazardous area classification drawing per GB50058, ensuring the right protection level for each zone — no over-specification, no wasted cost.
Frequently Asked Questions
Q: What special requirements apply to the core components of an explosion-proof crane?
A: Each component of an explosion-proof crane (ExdⅡBT4) has specific requirements: ① Motor — flameproof enclosure (HT250 cast iron, 8 mm wall thickness) with a sealed explosion-proof junction box; ② Electrical cabinet — flameproof (8 mm welded steel plate, machined flange surfaces); ③ Control buttons — Intrinsic Safety type (current ≤50 mA); ④ Hook — copper alloy (beryllium bronze, non-sparking under friction); ⑤ Limit switch — flameproof (Exd); ⑥ Fasteners — stainless steel for corrosion resistance. Every Kelude explosion-proof crane is supplied with an Explosion-Proof Certificate and nameplate.
Q: Can cranes in explosion-proof and non-explosion-proof zones share the same crane rail?
A: No. The crane rail must be interrupted at the firewall separating explosion-proof and non-explosion-proof zones, with an expansion joint of 50–100 mm, to prevent an explosion shockwave in the hazardous area from traveling along the rail into the safe zone. In addition, rail earthing resistance inside the explosion-proof zone must be ≤4 Ω (≤10 Ω in non-hazardous areas), reflecting different anti-static requirements. Kelude designs the rail system independently for each zone.
Q: Why are cranes not permitted in Class A warehouses?
A: GB50016 prohibits fixed equipment that can generate sparks inside Class A warehouses (storage of flammable liquids such as toluene/xylene with flash point ≤28°C). Crane motors, conductor rails and control boxes can all produce electrical or friction sparks, so Class A warehouses must rely on explosion-proof forklift trucks (diesel or electric explosion-proof versions) instead. A fire dike is required at the warehouse entrance, with a minimum clearance of 12 m from production workshops.
Q: What are the inspection intervals and maintenance requirements for explosion-proof cranes?
A: Inspection intervals for explosion-proof cranes: ① Daily — visual check of the explosion-proof motor and electrical cabinet for cracks or corrosion; ② Weekly — measure grounding resistance (≤4 Ω); ③ Monthly — inspect flameproof flange gaps (≤0.15 mm); ④ Quarterly — check copper alloy hook wear (≤5% of original dimension); ⑤ Annually — comprehensive explosion-proof performance inspection with a report issued by an accredited testing body. Kelude offers annual inspection services for explosion-proof cranes.
