Cement Mortar Lined and Coated Steel Pipe

Cement mortar lined and coated steel pipe is a steel water-pipe system with cement-mortar lining on the inside and an external anticorrosion system selected for the project. External protection may be paint, plastic coating, 3PE, or—only where specified—reinforced cement-mortar protective coating. It is used for municipal water transmission, raw-water mains, treatment plants, pump stations, and other large water-infrastructure systems.

This is a water-pipe protection system, not offshore concrete weight coating. Internal cement mortar primarily protects the pipe bore and supports long-term water conveyance. The outside coating is selected separately against soil, groundwater, atmospheric exposure, construction damage, and project service-life requirements.

Internal Cement Mortar + External Coating Options

ANSI/AWWA C205-24 specifies materials, application, and curing for shop-applied cement-mortar protective lining and coating for steel water pipe 4 in. (100 mm) and larger. Use it where the project calls for cement-mortar exterior coating; paint, plastic coating, and 3PE must follow their own approved project coating requirements.

Typical Product Scope

The base-pipe dimensions, lining/coating thickness, steel-cylinder wall, joint design, and field-joint treatment must be determined from the project drawings and technical specification.

Municipal Water and Raw-Water Transmission

CMLC steel pipe is suited to large municipal water mains and raw-water conveyance where the owner needs a steel pressure pipe with a durable internal mortar lining. Typical projects include intake lines, treatment-plant inlet/outlet piping, transmission mains, pump-station headers, reservoir connections, and industrial water networks.

For water service, the relevant questions are not only pipe size and pressure rating. The order must also define water quality, surge conditions, internal lining condition at joints, route geometry, bends and specials, external environment, installation sequence, and the method for field-joint restoration.

Why Internal Mortar Continuity Matters

The internal mortar lining must continue across the installed pipeline, not stop at the factory pipe end. Field joints, bends, reducers, tees, and closures need a defined lining/grouting procedure. If the pipe is welded in the field, the internal joint work must be coordinated with welding sequence, cure time, cleaning, and inspection.

Shop Application, External Coating, and Handling

1. Pipe fabrication and inspection – Verify steel cylinder, dimensions, welds, fittings, and traceability.
2. Internal lining application – Apply cement mortar by centrifugal spinning or another approved method for straight pipe; specials may require a suitable placement method.
3. External coating application – Apply the selected external paint, plastic coating, 3PE, or reinforced cement-mortar system under its approved procedure.
4. Curing and inspection – Cure and inspect the internal lining and selected external coating under their specified process before handling or shipment.
5. Protection and shipment – Protect pipe ends, internal lining, and external coating from drying damage, impact, abrasion, and point loading.
6. Field-joint completion – Restore internal and external continuity after installation using the specified field-joint procedure.

Cement Mortar Lining with External Coating Options

Quality Control