The Gradin Explosion-Proof Maintenance Scissor Lift elevates 5000 kg across a 5500mm stroke, providing sheltered access to refinery reactors while eliminating scaffolding erection inside hazardous operating zones.
Rated Capacity: 5000 kg (5T payload)
Envelope / Pit: 8.5 x 3.2 x 1.4 m footprint
Motion Spec: 5.5m rise @ 3.0 m/min
Working Surface: 8.0 x 2.8 m canopy deck
| Engineering Parameter | Imperial Measurement | Metric Value | Structural & Safety Standard |
| Rated Lifting Payload | 11023 lbs | 5000 kg (5 Metric Tons) | Uniformly distributed crew and tooling load |
| Vertical Travel Stroke | 18.04 ft | 5500 mm | Grade-to-vessel maintenance centerline rise |
| Retracted Machine Profile | 55.12 in | 1400 mm | Base frame height above foundation slab |
| Platform Deck Dimension | 26.25 x 9.19 ft | 8000 mm x 2800 mm | Non-slip chequered carbon steel plate |
| Canopy Overall Height | 7.22 ft Clearance | 2200 mm Deck Clear | Weatherproof overhead canopy shelter |
| Foundation Footprint | 27.89 x 10.50 x 4.59 ft | 8500 x 3200 x 1400 mm | Concrete pad with embedment anchor studs |
| Linear Lifting Velocity | 9.84 ft/min | 3.0 m/min | Regulated by pressure-compensated valves |
| Scissor Arm Material | 1.18 in Solid Steel | 30 mm Solid Plate | ASTM A572 Gr. 50 scissor arms (certified GB Q355B, EN 10204 3.1) |
| Hinge Pin Metallurgy | AISI 5140 Quenched | 40Cr Heat-Treated | Hardened pivot pins with bronze lube bushings |
| Hydraulic Drive Rating | 14.75 HP Flameproof | 11.0 kW / 380V / 50Hz | ATEX Zone 1 hydraulic power unit (Ex d IIB T4) |
| Hydraulic Ram Package | 4 Units @ 4.9-3.9 in | Φ125-100 Heavy Rams | Honed barrels with hard-chrome plated rods |
| Holding Valve Circuit | Flange Direct Mount | Dual Holding Cartridges | Flange-mounted hydraulic check valves |
| Surface Protective Paint | 320 µm Dry Film | Marine Epoxy System | C5-M chemical resistant epoxy coating |
| Access Walkway Spec | 3.28 ft Width Tread | 1000 mm Open Width | Galvanized industrial stair access with handrails |
| Explosion Classification | Class I Div 1 / Zone 1 | ATEX / IECEx Certified | Ex d IIB T4 Gb hazardous location compliant |
| Structural Standard | EN 1570-1 / ANSI A92.20 | Type Certified Rig | Compliant with BS EN 1570-1:2024 |
Gantry-milled from heavy structural plate with solid cross-torque members, these ASTM A572 Gr. 50 scissor arms (certified GB Q355B/Q345B equivalent with EN 10204 3.1 certificates) eliminate lateral sway under concentrated eccentric pipe bundle loads. The pantograph frame dissipates wind resistance against the overhead canopy, preventing torsional structural fatigue on this EN 1570-1 hazardous area lift during continuous petrochemical turnarounds.
Fabricated from corrugated structural steel and welded directly to perimeter handrail uprights, this weatherproof overhead canopy shelter protects technicians from direct solar radiation and corrosive atmospheric drip. Integrated galvanized industrial stair access with self-closing safety gates allows unhindered worker egress, eliminating ladder slipping hazards during valve and flange overhauls on this refinery turnaround maintenance platform.
Threaded straight onto cylinder bodies through SAE code 62 ports, these flange-mounted hydraulic check valves prevent platform creep and uncommanded descent during line rupture. The zero-leak poppet design locks hydraulic fluid inside the cylinder barrels within 40 milliseconds of pressure loss, holding full rated payloads rigid even during high-pressure washdown operations.
Isolated inside a heavy cast explosion-proof enclosure, this ATEX Zone 1 hydraulic power unit eliminates electrical spark ignition risks in volatile hydrocarbon atmospheres. The 11.0 kW Ex d IIB T4 motor drives an external gear pump through flameproof conduit fittings, while intrinsically safe push-button stations give operators dead-man elevation control without generating dangerous contact arcs
Engineered for crude distillation units, catalytic crackers, and offshore gas gathering plants. This refinery turnaround maintenance platform provides continuous access to heat exchanger tube bundles located 5.5 meters above grade. Anchor bolts secure the base into a 8500 x 3200 x 1400mm reinforced slab, while the structure sustains 25% dynamic cantilevered eccentric loads during heavy flange torqueing without frame deflection.
Built for marine solvent loading wharves and bulk hydrocarbon tank farms. Operating across ambient yard temperatures of -20°C to +55°C, the chassis features a certified C5-M chemical resistant epoxy coating that halts atmospheric oxidation from sulfur dioxide and marine salt spray. Non-sparking brass roller tracks and ground bonding straps dissipate static charges straight to earth.
Deploys adjacent to vertical reaction columns and piping trestles requiring periodic catalyst replacement and gasket inspection. The cantilevered working deck interfaces flush with vessel platforms, while the solid overhead canopy protects personnel from sudden exterior weather downpours, maintaining turnaround schedules without building temporary scaffolding towers.
For this heavy-duty series, we can engineer load capacities up to [300] tons, with platform dimensions and lifting heights customized to your operational envelope. Requirements exceeding our standard engineering matrix will undergo a Finite Element Analysis (FEA) by our engineering team to ensure structural viability before proposing a solution.
To initiate the engineering proposal, please provide the following baseline data:
Rated Load Capacity
Maximum Lifting Height & Closed Height
Platform Dimensions (L x W)
Duty Cycle (e.g., operational cycles per hour/day)
Environmental Conditions (e.g., indoor/outdoor, washdown, explosion-proof)
Pit depth or overhead clearance constraints
Yes. The control systems can be equipped with standard communication protocols (e.g., Profinet, Modbus, Ethernet/IP) utilizing [Siemens / Allen-Bradley / Omron] PLCs. This ensures seamless I/O signal synchronization with upstream/downstream conveyors, AGV/AMR units, and your central control room.
Every custom unit undergoes a mandatory Factory Acceptance Test (FAT) prior to dispatch. This includes continuous operational testing at 100% rated load, static overload testing at [120% / 125%] capacity, and the physical triggering of all mechanical anti-fall and hydraulic safety interlocks. FAT documentation and video proof are included in your engineering package.
Upon final approval of the General Arrangement (GA) drawings, the manufacturing lead time is typically 4 to 8 weeks. Oversized structural components are engineered with a modular design to fit into standard shipping containers (20FT/40HQ). On-site assembly utilizes pre-engineered bolted flange connections and heavy-duty aviation plugs, strictly eliminating the need for field welding.
We provide a standard [12/24]-month warranty covering the structural frame and primary hydraulic/electrical components. To minimize operational downtime, a comprehensive set of standard consumables (e.g., cylinder seal kits, travel switches, relays) is shipped alongside your equipment. During the warranty period, replacement parts for non-human-induced failures are dispatched via priority air freight (DHL/FedEx) within 48 hours.
Beyond the warranty, we guarantee lifetime engineering support. Your custom equipment's CAD drawings, electrical schematics, and BOM (Bill of Materials) are permanently archived in our system. This ensures you receive uninterrupted remote troubleshooting, maintenance guidance, and exact spare parts matching for the entire lifecycle of the equipment.
Gradin Machinery is a leading manufacturer specializing in aerial work platforms and hydraulic lifting solutions. With ISO & CE certifications, we provide safe, reliable, and customized equipment for global industrial needs
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