Yangtze-to-Huaihe Water Diversion Phase II — DN2420 Epoxy-Coated Pipe (Taihe–Jieshou–Linquan)

Project at a glance

Scope

DN2420 with internal and external epoxy-resin coating, cut to a fixed 6 m length for the transmission main. On a scheme of this length — roughly 89.9 km of new pipeline in the associated works — the pipe is ordered in successive campaigns rather than one lump, so production planning and coating capacity matter as much as the pipe itself.

Resident inspection, three-party acceptance

The client kept resident inspectors in the mill through plate intake, spiral production and coating, and every consignment was accepted on site by the supervisor, the owner and the contractor jointly. Lot 1 was commissioned with water on 30 December 2025.

Coating for potable-water service

Internal epoxy lining protects water quality and keeps friction loss low over decades of service; the external coating protects the pipe in trench conditions. Both are applied in-house, which keeps the internal lining and the external coating on the same schedule as the pipe instead of trailing behind it.

Why large-diameter water projects choose coated pipe

• Lower lifecycle cost — a lined bore resists corrosion and maintains hydraulic capacity without frequent rehabilitation.
• Fewer joints per kilometre — large diameters with long lengths cut the number of field welds and the associated testing.
• One supplier, one schedule — pipe, coating and fittings from the same shop removes the coordination gap between mill and coater.