Overview
Cement mortar lined (CML) pipes are steel pipes coated internally with a layer of cement mortar, typically 5–12 mm thick. They are widely used in water distribution and sewage systems due to their ability to resist corrosion and maintain hydraulic efficiency. The lining is applied centrifugally or by spinning, ensuring a smooth, uniform surface that reduces friction losses. CML pipes are preferred for their longevity (50+ years) and cost-effectiveness compared to alternatives like ductile iron or PVC pipes in large-diameter applications.
Structure and Working Principle
The pipe consists of a steel shell providing structural strength, while the cement mortar lining protects against corrosion and scaling. The alkaline nature of cement (pH ~12) passivates the steel surface, preventing rust formation. During operation, the smooth lining minimizes turbulence and biofilm growth, ensuring consistent flow rates. The lining also resists chemical attack from chlorides and sulfates commonly found in water and wastewater.
Key Features
1. **Corrosion Resistance**: The cement lining isolates the steel from water, preventing electrochemical corrosion. 2. **Hydraulic Efficiency**: Smooth surface (0.3–0.4 mm roughness) reduces head loss by up to 20% compared to unlined pipes. 3. **Durability**: Withstands pressures up to 2.5 MPa and temperatures from 0°C to 60°C. Additional benefits include resistance to water hammer effects and compatibility with disinfection methods like chlorination.
Application Areas
CML pipes are primarily used in: - **Municipal Water Supply**: For mains and distribution networks. - **Sewage Systems**: Especially for non-aggressive wastewater. - **Fire Protection**: As underground mains due to their reliability. They are also employed in industrial cooling systems and irrigation projects where cost and longevity are critical factors.
Maintenance and Precautions
Regular inspections should check for lining cracks or spalling, which may expose the steel substrate. Minor damage can be repaired with cementitious coatings. During installation, avoid dragging pipes to prevent lining abrasion. Ensure proper joint sealing to prevent leakage, which could undermine the lining’s protective properties. For aggressive environments (e.g., high sulfate content), sulfate-resistant cement linings are recommended.
B2B Procurement Guide
When sourcing CML pipes: 1. **Standards Compliance**: Verify adherence to AWWA C205 or ISO 4179. 2. **Lining Thickness**: Specify based on pipe diameter (e.g., 6 mm for DN300 pipes). 3. **Testing**: Request mill test reports for lining adhesion and compressive strength (typically ≥30 MPa). Lead times vary from 4–12 weeks; bulk orders (500+ meters) may qualify for 5–10% discounts. Consider regional suppliers to reduce logistics costs.
Related Manufacturers
- 主营：管板、大型法兰、罩型通气帽、管道支吊架、人孔门、常压人孔、垂直吊盖人孔、绝缘接头、绝缘法兰、换热器管板、冷凝器管板、碳钢管板、大口径法兰、隔热管托、恒力弹簧支吊架、管托、人孔、弹簧支吊架、堆焊管板、复合管板、厚壁螺旋钢管、管板加工、清扫孔、排污孔、罩型通气管
- 主营：[]
- 主营：[]
- 主营：充填管道、井下充填管道、回填管道、矿山耐磨管道、碳化铬堆焊管道、双金属耐磨管道、砂浆输送管道、耐磨管道管件、堆焊耐磨管
- 主营：充填管道、回填管道、矿山充填管道、井下充填管道、钻孔竖井充填管道、堆焊耐磨管道、碳化铬堆焊管道、矿山耐磨管道、双金属耐磨管道、堆焊耐磨管、堆焊钢管
- 主营：双金属耐磨管道、堆焊合金耐磨管道、内壁淬火耐磨管道、陶瓷复合耐磨管道、矿山充填管道管件、尾矿回填管道管件、抽沙排泥疏浚管道
- 主营：防腐钢管、粉末防腐管、大口径焊接管、输送管道、厚壁钢管护筒、消防涂塑钢管、大口径厚壁钢管、大口径涂塑钢管
- 主营：防腐钢管、螺旋钢管、直埋预制保温钢管、钢套钢蒸汽管道、直缝埋弧焊钢管、内外涂塑钢管、直缝电阻焊钢管、聚氨酯保温钢管
- 主营：螺旋钢管、无缝钢管、聚氨酯保温钢管、水泥砂浆衬里防腐钢管、钢套钢蒸汽保温钢管、3PE防腐钢管、TPEP防腐钢管、内外涂塑钢管、EWR直缝焊管、JCOE埋弧焊直缝钢管、热镀锌钢管、涂塑复合钢管、热浸塑电力穿线钢管、给排水涂塑钢管、消防涂塑钢管、法兰连接涂塑钢管、沟槽涂塑钢管、矿用双抗涂塑复合钢管、外聚乙烯PE内环氧树脂EP涂塑防腐钢管、环氧煤沥青防腐钢管、饮水舱IPN8710环氧树脂防腐钢管、3油2布防腐、4油3布防腐、6油2布加强级防腐
- 主营：水泥砂浆防腐钢管、直缝钢管、tpep防腐钢管
- 主营：防腐钢管、涂塑钢管、8710防腐钢管、水泥砂浆防腐钢管、防腐管道、水泥砂浆钢管、大型卷管、无溶剂聚氨酯防腐钢管、环氧树脂内外涂塑钢管、螺旋钢管、无缝钢管、直缝钢管、三油两布防腐钢管、五油三布防腐钢管、内外涂塑管件、内外涂塑钢管、内外防腐钢管、给排水防腐钢管、3PE涂塑防腐钢管、3pe防腐钢管、螺旋焊接钢管、涂塑防腐钢管、饮用水涂塑钢管、螺旋管、聚乙烯涂塑钢管
- 主营：涂塑钢管、保温钢管、螺旋钢管、3PE防腐钢管、涂塑复合钢管、消防涂塑钢管
- 主营：螺旋管、球墨铸铁管、螺旋钢管、聚氨酯保温管道、钢花管、声测管、钢材、焊管、涂塑无缝钢管、防腐无缝钢管、镀锌钢管、新兴铸管、精密钢管、波纹管、大口径直缝钢管、球墨管、钢护筒、钢铁、内外涂塑钢管、灌注桩声测管、防腐钢管、镀锌管、57声测管、热镀锌钢管、钢塑复合管
- 主营：保温钢管、防腐钢管、涂塑钢管、水泥砂浆衬里防腐、聚氨酯保温管、3PE防腐钢管、内外涂塑钢管
- 主营：防腐钢管、涂塑钢管、螺旋钢管、管道管件、市政管道、保温钢管、法兰、3PE钢管、三油两布防腐钢管、环氧煤沥青防腐钢管、市政供暖
- 主营：无缝钢管、钢板桩、不锈钢管、2PE防腐管道、无缝管、化肥专用管、管线管、石油裂化管、锅炉管、高压锅炉管、镀锌钢管、镀锌管、螺旋钢管、合金钢管、钢绞线、20G无缝钢管、角钢、槽钢、工字钢、H型钢、钢板、Q235B角钢、镀锌螺旋管、精密钢管、防腐钢管、精制钢方管
- 主营：涂塑钢管、保温钢管、防腐钢管、水泥砂浆衬里防腐管道、螺旋钢管、涂塑复合钢管、防腐螺旋钢管、直缝焊管、螺旋焊管、无缝钢管、镀锌钢管、镀锌焊管、法兰、弯头、钢塑复合管、3PE防腐钢管、螺旋管、保温管、保温螺旋钢管、镀锌管、内外涂塑钢管、螺旋地桩、注浆管、声测管、预制钢筋桩、防腐涂塑钢管
- 主营：涂塑钢管、防腐钢管、螺旋钢管、涂塑防腐管道、涂塑矿用管道、螺旋管、直缝焊管、无缝钢管、镀锌钢管、镀锌管、3PE防腐钢管、热浸塑钢管、电缆保护管、钢塑复合管、涂塑碳钢管、复合穿线管、城市燃气管、钢塑复合钢管、钢塑复合套管、涂塑防腐钢管、涂塑焊接钢管、涂塑复合钢管、涂塑电缆钢管、内涂塑外pe钢管、内外涂塑钢管
- 主营：直缝钢管、防腐钢管、直缝焊接钢管、水泥砂浆防腐钢管、直埋保温钢管、发泡保温钢管、蒸汽保温钢管、大口径直缝焊管
- 主营：铸铁管、侧排雨水斗、铸铁排水管件、球墨铸铁地漏、排水管件防漏宝、同层排水汇集器、铸铁井盖、排水篦子、止水节、防漏宝、预埋件止水节、W型铸铁管、柔性铸铁钢管、同层排水、A型铸铁管件、A型铸铁管、铸铁预埋件、柔性机制铸铁管、预埋件75、给水球墨管、排水铸铁管、圆形泄水管、柔性铸铁管、铸铁止水节
- 主营：给水管、pvc线槽、pvc实壁、钢骨架、联塑pvc、pvc给水、排污管、钢带管、复合管、pvc排水、排水管、聚乙烯、pvc线管、穿线管、联塑ppr、hdpe穿线、hdpe塑钢、hdpe双壁、pe管联塑、pe燃气管、pe通讯管、聚氯乙烯、排水排污、防水塑料、双壁波纹