The inner lining material of ductile iron pipes has a significant impact on their corrosion resistance. Different lining materials can provide varying degrees of protection against corrosion from the external environment. Below is a detailed introduction to several common lining materials and their applicable environments:
Ordinary silicate cement mortar lining is the most common type of lining for corrosion protection in ductile iron pipes. It can isolate water from the pipe body and protect the pipe body from corrosion.
Suitable for: transporting most raw water and drinking water.
High-alumina cement lining pipe
High-alumina cement is a commonly used reinforced anti-corrosion lining with advantages such as rapid hardening, high temperature resistance, acid resistance, and corrosion resistance.
Suitable for: rainwater and sewage discharge pipelines and industrial or domestic wastewater conveyance pipelines containing certain chemical substances.
Sulfur-resistant cement lining pipe
Sulfur-resistant cement lining pipes have strong resistance to chemical corrosion, good adhesion, and high density.
Suitable for: sewage pipes and seawater transportation.
Waterborne epoxy resin lined pipes feature strong coating adhesion and resistance to acids, alkalis, and salts.
By spraying a layer of waterborne epoxy resin onto the cement lining surface, with a coating thickness >=200μm, a tough protective layer is formed, solving the problem of pH increases affecting water quality.
Applicable to: Direct drinking water projects.
Epoxy ceramic liners have advantages such as corrosion resistance, antistatic properties, and strong wear resistance, as well as high adhesion and smoothness.
Suitable for: water supply projects and urban sewage discharge projects, especially in arid regions such as deserts, where its advantages are obvious.
Polyurethane lining tubes have the characteristics of high wear resistance, corrosion resistance, zero permeability, smooth surface, low resistance coefficient, anti-scaling, no volatile organic compounds, and compliance with environmental protection requirements.
Suitable for: drainage pipes with high lining requirements and low resistance coefficient; sewage pipes with high corrosiveness; water supply pipes containing acid and alkali, such as domestic sewage, mine wastewater, and seawater desalination.
Each type of lining has its specific application scenarios and advantages. Choosing the right lining material is crucial for improving the service life and performance of ductile iron pipes and can also ensure the long-term stable operation of ductile iron pipe networks.
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