Indian Heavy Fabrication + Crane Workshop MEP — ASME BPVC + AWS D1.1 + ISO 3834 + IS 807
A 25,000 t/yr Indian heavy fabrication workshop (L&T / BHEL / BDL class) demands ₹831 Cr MEP capex with 4 × 250 t bridge cranes + plate handling + heavy SAW/GMAW welding + 30 m × 8 m × 8 m stress-relief furnace + hydro-test pit + ASNT-NDT bay + paint shop. ASME BPVC + AWS D1.1 + ISO 3834 + IS 807/2825 govern. Three failures: crane runway differential settlement 5-10 mm causing lift fail, hydro-test pit not earth-bermed for 5-15 MJ explosion energy, stress-relief furnace exhaust at 400-500°C wasting 60 % energy (specify recuperator + WHR boiler).
Indian heavy fabrication workshop MEP framework
Indian heavy fabrication (L&T Powai + Hazira + Talegaon, Larsen Heavy Engineering, BHEL Trichy + Hardwar, BDL Bharat Dynamics, Tata Hitachi Kharagpur, Greaves, Bharat Heavy Plate + Vessels) builds boilers + pressure vessels + nuclear reactor + offshore platform + heavy crane + railway wagon. Standards stack — ASME BPVC Sec VIII Div 1+2 (pressure vessel) + ASME B31 (piping) + ISO 3834 (welding quality) + EN 13445 (PV) + ASNT-NDT + Indian Boiler Regulations + IS 2825 + IS 4732 + AWS D1.1 (structural welding).
Heavy fabrication shop MEP — 25,000 t/yr capacity
| Bay | Equipment | Standard | Capex (₹ Cr) |
|---|---|---|---|
| Heavy assembly bay (250 t crane × 4 spans) | — | IS 807 + ASME B30 | 185 |
| Plate handling + cutting | plasma + flame + laser | AWS | 62 |
| Heavy welding (SAW + GMAW + GTAW) | automated + robotic | ISO 3834 + AWS D1.1 | 85 |
| Vessel rolling + bending | heavy plate roll + press | — | 55 |
| Heat treatment + stress relief | furnace 30 m × 8 m × 8 m | — | 125 |
| Hydro-test pit (2000 bar) | — | ASME BPVC | 85 |
| Pneumatic test pit | high-pressure (1.5 × design) | — | 35 |
| NDT bay (UT + RT + MT) | radiography + ultrasonic | ASNT-NDT | 45 |
| Painting + galvanising | 30 m × 8 m × 8 m booth + bath | NFPA 33 | 62 |
| Storage + dispatch | heavy haul | — | 35 |
| Compressed air (50 bar) | — | — | 22 |
| DG + electrical (10 MW) | — | — | 35 |
| Total heavy fab workshop | — | — | 831 |
Three Indian heavy fab workshop MEP failures
- Crane runway + foundation settlement — 250 t crane × 4 spans × 250 m runway settles 5-10 mm differential over 12-24 months on soft soil. Crane lift-fail + structural distortion of fabricated vessel during 1000-t lift. Specify pile foundation + laser-survey calibration twice a year per IS 807 + ASME B30.
- Hydro-test pit drainage + safety zoning — hydro-test at 1.5x design pressure (often 100-200 bar) on 100-t vessel = explosion energy 5-15 MJ. Specify earth-bermed remote test pit + remote-operated + emergency-evacuation drill + isolation valve.
- Stress relief furnace exhaust + heat-recovery missed — 30 m × 8 m × 8 m furnace at 650-700°C operates 24-48 hrs per cycle. Exhaust at 400-500°C wastes 60 % of energy. Specify recuperator + air-preheat + WHR boiler — saves ₹4-6 Cr/yr.
- ASME Boiler + Pressure Vessel Code Section VIII Div 1+2 2023 Edition.
- ASME B31.1 + B31.3 — Power + Process Piping.
- ASME B30.2 — Overhead + Gantry Cranes.
- ISO 3834 series — Quality Requirements for Fusion Welding.
- AWS D1.1:2024 — Structural Welding Code Steel.
- EN 13445 — Unfired Pressure Vessels.
- IS 2825:1969 + IS 4732 — Indian Code for Unfired Pressure Vessels.
- ASNT-NDT American Society for Non-Destructive Testing Recommended Practices 2024.