Tunnel Boring Machine (TBM) Site MEP for Indian Metro + Rail — ITA + AFTES + BTS + IS 7920

An 8 m dia EPB TBM 10 km Indian metro/rail tunnel site demands ₹832 Cr MEP capex covering TBM machine + 15 MVA portal + slurry treatment + segment factory + ventilation + dewatering. ITA + AFTES + BTS + IS 7920 + DGMS govern. Indian EPB best 18-22 m/day vs Crossrail 40. Three failures: portal at 5-8 MVA tripping at cutterhead start (need 15-20 MVA), slurry cyclones wearing in 30-60 days without ceramic lining, tunnel construction vent at 8-12 ACH vs 15-25 required violating ACGIH worker TLV.

Tunnel Boring Machine (TBM) site MEP framework

Indian TBM sites (Mumbai Metro Line 3, Bengaluru Metro Phase 2, Chennai Metro Phase 2, RVNL Rishikesh-Karnaprayag, Delhi-Meerut RRTS) operate 8-14 m diameter slurry/EPB TBMs cutting 12-18 km/year. TBM site MEP combines surface logistics + portal substation + slurry treatment plant + segment factory + dewatering + ventilation + worker amenities. Standards stack — ITA International Tunnelling Association + AFTES French Association + BTS British Tunnelling Society + IS 7920 (tunnelling) + DGMS (where tunnelling) + worldcoal mining standards + NFPA 502 + PIARC (where road).

TBM site MEP scope — 8 m dia EPB TBM + 10 km tunnel

Three Indian TBM site MEP failures

1. Portal substation under-sized for TBM peak — EPB TBM peak draw 12-18 MVA at cutterhead start. Standard 5-8 MVA portal trips during cutterhead start. Specify 15-20 MVA + soft-starter + STATCOM compensation.
2. Slurry treatment plant cyclone wear — slurry-TBM produces 400-600 m³/hr abrasive spoil. Cyclones wear out in 30-60 days requiring rebuild. Specify ceramic-lined cyclones + automatic switchover.
3. Tunnel construction ventilation insufficient for diesel + dust — TBM site diesel + dust at face + behind needs 15-25 ACH at face per ITA + PIARC. Indian projects often spec 8-12 ACH causing worker exposure violation per DGMS + ACGIH TLV.