A fixed access platform is a permanent elevated SS structure providing a level work surface around or above process equipment — reactors, mixers, blenders, vessel heads, filter presses, and process skids — with a perimeter handrail system and kick plate meeting EN ISO 14122 / OSHA 1910.23 access equipment standards. Processing working live loads of 2.0–7.5 kN/m² (200–750 kg/m²) at platform heights of 600 mm to 6,000 mm, it provides permanent safe access for operation, sampling, maintenance, and inspection without temporary scaffolding.
The primary structure is fabricated from SS 316L RHS (rectangular hollow section) or channel main beams spanning between SS 316L welded tube column posts — column spacings of 1,200–2,400 mm are typical. Secondary beams (joists) span between primary beams at 300–600 mm centres. Flooring panels (chequer plate, grating, or perforated plate) are bolted or clip-fixed to the joist grid, fully demountable for equipment access. The perimeter handrail system consists of a top rail (DN 40–DN 50 tube, 1,100 mm above platform), intermediate rail (500–550 mm), and toe board (kick plate, 150 mm high) — conforming to EN ISO 14122-3. Self-closing spring gates provide access to stair and ladder openings.
Challenges
Corrosion at Crevice Joints in Wet Process or Chlorinated Clean Room Environments
Crevice between overlapping members in bolted joints traps liquid — localised chloride corrosion in pharmaceutical and food cleaning environments.
Deflection Under Live Load Causing Flooring Panel Rattle and Operator Discomfort
Undersized secondary joists deflect under 3.0 kN/m² live load — flooring panels flex and rattle; operators report instability.
Column Base Plate Corrosion Under Standing Water at Floor Level
Platform column bases sit in floor drainage depressions or low points — standing water under base plate corrodes weld zone.
Handrail Horizontal Force Capacity at Platform Edge (100 kg Horizontal Load per EN ISO 14122)
Inadequate handrail post spacing or thin-wall tube fails the EN 14122 horizontal load test — safety critical.
Flooring Gap Width at Equipment Penetrations Creating Tripping Hazard
Gaps around pipes, columns, and equipment penetrations through flooring exceed 20 mm — regulatory non-compliance and trip hazard.
Solutions
- Full-Penetration Butt Welds on All Primary Frame Joints + Post-Weld Acid Passivation: Full-penetration butt welds eliminate crevice; citric or nitric acid passivation forms chromium oxide film on all weld zones.
- Joist Sizing to L/300 Deflection Limit Under Full Live Load (Secondary Beam Depth ≥ Span/25): Engineer joists to L/300 — span 1,200 mm: joist depth ≥ 48 mm; span 1,800 mm: ≥ 72 mm minimum for 3 kN/m².
- Column Base Plates with Drainage Slot + Raised Mounting on Grout Pad (25 mm Stand-Off): Slotted base plate allows drainage; 25 mm grout pad lifts plate above floor — eliminates standing water contact zone.
- Post Spacing ≤ 1,000 mm + DN 48.3 × 2 mm Handrail Tube (DN 50 CHS, Grade 316L): 1,000 mm maximum post spacing with DN 48.3 × 2 mm structural CHS handrail — exceeds EN 14122 horizontal 0.3 kN/m load requirement.
- Close-Fitting Trim Plates Around All Equipment Penetrations (Gap ≤ 12 mm, Bolted Removable): Removable trim plates close gaps to ≤ 12 mm (OSHA/EN compliant) — bolted for removal during equipment maintenance.
Applications
- Pharmaceutical Manufacturing: GMP platforms around reactors, blenders, ANFD, and filter presses — Ra <0.8 µm; slope-to-drain; electropolished perforated flooring.
- Food & Beverage: Platforms over brewing vessels, food processing lines, CIP skids — swaged grating; self-draining; 3-A hygienic design.
- Chemical Processing: Equipment access platforms on distillation columns, heat exchangers, and reactors — bar grating for chemical splash drainage.
- Pharmaceutical Warehousing: IBC and drum handling mezzanine platforms — solid plate or chequer plate; 5.0 kN/m² live load; forklift access gates.
- Water & Utilities: Pump and valve access platforms over pipe trenches and pump pits — open bar grating for drainage of drips and leaks.
Models & Capacities
Fixed Access & Process Equipment Platform — Standard Module Reference | |||||||||||
Model | Type | Platform Area [m²] | Platform Height [mm] | Live Load [kN/m²] | Primary Beam Section | Secondary Joist (typical) | Flooring Standard | Handrail Height [mm] | Handrail Tube (OD×t) | Column Section |  |
PAF-S-2×2 | Fixed access | 4 (2×2 m) | 600–1,200 | 3.0 | 80×40×3 RHS | 50×30×2 RHS | Chequer plate 4 mm / bar grating | 1,100 | DN48.3 OD×2t | 50×50×3 SHS |  |
PAF-S-2×4 | Fixed access | 8 (2×4 m) | 600–2,000 | 3.0 | 100×50×3 RHS | 60×40×2 RHS | Chequer plate / bar grating / perf plate | 1,100 | DN48.3 OD×2t | 60×60×3 SHS |  |
PAF-S-3×4 | Fixed access | 12 (3×4 m) | 800–2,500 | 3.0 | 120×60×4 RHS | 60×40×3 RHS | Bar grating / chequer plate | 1,100 | DN48.3 OD×2t | 60×60×4 SHS |  |
PAF-S-4×6 | Fixed access | 24 (4×6 m) | 1,000–3,000 | 3.0 | 150×75×5 RHS | 80×40×3 RHS | Bar grating 25×3 I-bar / perf plate | 1,100 | DN48.3 OD×2t | 80×80×4 SHS |  |
PAF-GMP-2×2 | GMP process | 4 (2×2 m) | 600–1,500 | 3.0 | 80×40×3 RHS full pen weld | 50×30×2 RHS | Perf plate 3 mm Ø6 holes / press-lock | 1,100 | DN48.3 EP | 50×50×3 SHS |  |
PAF-GMP-3×4 | GMP process | 12 (3×4 m) | 800–2,500 | 3.0 | 120×60×4 RHS full pen weld | 60×40×3 RHS | Perf plate / solid anti-slip | 1,100 | DN48.3 EP | 60×60×4 SHS |  |
PAF-H-3×4 | Heavy duty | 12 (3×4 m) | 500–2,500 | 5.0 | 150×75×5 RHS | 80×40×4 RHS | Chequer plate 5 mm / bar grating 40×3 | 1,100 | DN48.3 OD×3t | 80×80×5 SHS |  |
PAF-H-4×6 | Heavy duty storage | 24 (4×6 m) | 500–3,500 | 7.5 | 200×100×6 RHS | 100×50×4 RHS | Chequer plate 6 mm / open bar grating | 1,100 | DN60.3 OD×3t | 100×100×5 SHS |  |
PAF-MEZ-6×8 | Mezzanine bay | 48 (6×8 m) | 2,500–6,000 | 3.0 (operating) / 5.0 (storage) | 254×102×22 UB (SS) | 100×50×4 RHS | Open bar grating 40×3 / chequer 5 mm | 1,100 | DN48.3 OD×2t | 100×100×6 SHS or 120CHS |  |