Scaffolding Pipe

BS 1139-1:1990 (confirmed 2016) §4.1 specifies OD 48.3±0.5mm, wall thickness 2.0mm minimum (3.2mm for heavy duty). Mass per unit: 4.37 kg/m at 4.0mm wall. EN 39:2001 §5.1 requires OD 48.3±0.5mm, wall ≥ 3.2mm for standard use, ≥ 4.0mm for heavy-duty. EN 39 Table 2 sets maximum deviation: OD ±0.5mm, out-of-roundness ±0.5mm. ASTM A53-22 §6.5 permits OD ±1% for pipe up to NPS 2. Length tolerance per BS 1139: +0/-5mm for cut-to-order lengths.

Per ISO 1461:2022 §6, HDG coating ≥ 600 g/m² (≈ 85 μm) for steel ≥ 6mm thick, ≥ 400 g/m² (≈ 55 μm) for 3-6mm. The Fe-Zn intermetallic alloy layers per ASTM A90/A90M provide cathodic protection — exposed steel is protected sacrificially at cut edges. Electro-galvanizing per ISO 2081 (Fe/Zn 8-12 μm) has no alloy layer; coating life is proportional to thickness per ISO 9223 corrosion rate curves. For 20-30 year outdoor service in C3/C4 environments (urban/industrial coastal), HDG per ISO 1461 is required. Salt spray test per ASTM B117: HDG ≥ 720 h to red rust, EG ≤ 96 h.

BS 1139-2:1990 Section 6 specifies working load 1.5-2.0 tons/leg at 200mm base plate. Beyond 1.5m free height, load capacity follows Euler buckling per EN 1993-1-1 §6.3.1: P_cr = π²EI / (KL)². For 48.3×3.2mm S235GT (yield ≥ 235 MPa per EN 10025-2 §6): buckling load at 2m = 27.3 kN, drops to 12.1 kN at 3m. Minimum safety factor per BS EN 12811-1:2003 Table 2: 2.0 on yield strength (Rm/Re ≥ 2.0). For heavy duty: safety factor 2.5 on yield. Welded joint efficiency per EN 1993-1-8 Table 4.1: fillet welds 0.8× base metal strength.

EN 39:2001 §6 specifies S235GT per EN 10025-2:2019: C ≤ 0.20%, Mn ≤ 1.40%, P ≤ 0.045%, S ≤ 0.045%, Al ≥ 0.020%. Tensile 360-510 MPa per EN 10025-2 Table 2. Yield ≥ 235 MPa (t ≤ 16mm), ≥ 225 MPa (16-40mm). Elongation ≥ 24% per EN ISO 6892-1 method A. Impact ≥ 27 J at 0°C for thickness ≥ 15mm per EN 10025-2 §7. These limits match BS 1139-1 Table 1 mechanical requirements. ASTM A53 Grade B alternative: yield ≥ 240 MPa, tensile ≥ 415 MPa.

Per EN 10204:2004: Type 3.1 inspection certificate (issuing integrated with manufacturer) or Type 3.2 (independent third party — SGS/BV/TÜV). BS 1139-1 §7 requires: chemical composition per EN 10025-2 §5.1 + A1 method; tensile test per EN ISO 6892-1 at 0.004 s⁻¹ strain rate; flattening test per EN 10236 (no cracking at 0.67×OD gap). EN 39 §9 adds bend test per ISO 7438 (180° at 2×OD former) and weld integrity per ISO 10893-6 eddy current. Hydrostatic test per EN 10216-1 §7: 3 seconds at 5 MPa minimum. Dimensional audit per ISO 2768-1 ±0.5mm.

Standard per BS 1139-1 §8.2: hexagonal bundle of 37 or 61 pieces, steel straps at 1m intervals, both ends capped with plastic protectors. End-marking per EN 10219-2 §9. 20ft container: 8-12 tons (480-720 pcs at 48.3×3.2×6m). 40ft container: 18-22 tons. FOB Tianjin/Qingdao port, CIF, CFR, or DAP incoterms. Lashing per IMO/ILO guidelines. For moisture-sensitive projects: VCI (vapor corrosion inhibitor) paper wrap + outer woven PP bag per MIL-PRF-3420H. Container dehumidifier per BS 1139-1 Annex A.

Stock items (48.3×3.2×6m hot-dip galvanized per BS 1139): 5-10 days. Standard mill order (sizes 3-6.3m, batch ≥ 50 tons): 20-30 days. Custom specifications (special grade or coating): 30-45 days. Minimum order quantity: 5 tons for stock sizes, 25 tons for mill direct. Raw material HRC inventory maintained at 8-week buffer. ISO 9001:2015 §8.3 production planning with weekly progress reporting for orders ≥ 100 tons.

BS 1139-1:1990 §8.2 defines bundle formats:

(1) 37-piece (hexagonal 4:3 ratio) — 0.35m² cross section, net weight 1.04 tons at 48.3×3.2×6m.

(2) 61-piece (hexagonal 5:4 ratio) — 0.46m² cross section, net weight 1.71 tons.

The 37-piece bundle fits 24 units per 20ft container; the 61-piece bundle fits 14 units per 20ft container. Both allow single forklift handling at 2-3 tons capacity. Steel strap tension per ISO 5446: 15-20 N·m banding. End ring crush: ≥ 1.25× bundle weight per ASTM D642.