Short answer. Treat the inside and the outside as two separate specifications. The bore is selected from water quality and hygiene requirements; the exterior is selected from soil, groundwater, salt exposure and the transport chain.
- For municipal raw and treated water, cement mortar lining is normally the first internal option to evaluate.
- Buried external protection is driven by soil conditions, groundwater and backfill abrasion.
- Above-ground sections need a weathering-resistant paint system with a defined field touch-up procedure.
- Write lining thickness, curing, pipe-end termination and field joint restoration into the technical agreement, not just the coating name.
AWWA C205 covers cement mortar lining; C210, C213 and C215 cover liquid epoxy, FBE and polyolefin systems respectively.
Monsoon rainfall and high groundwater mean the external specification should be reviewed together with the trench and backfill method, since saturated backfill changes both abrasion and corrosion exposure.
See our cement mortar lined steel pipe for the supply range. Send water quality, burial depth and the above-ground sections and we will prepare separate internal and external proposals. Send your enquiry.
