Cast iron pipe is a type of tubular material produced through the casting process using cast iron. These pipes are commonly used in water supply, drainage, and gas distribution systems, and they come in both straight pipe sections and various fittings. One of the advantages of cast iron pipes is their low labor intensity during installation. Depending on the casting method, they can be categorized into continuous cast iron pipes and centrifugal cast iron pipes. The centrifugal type is further divided into sand-mold and metal-mold varieties. In terms of material composition, cast iron pipes are classified into gray cast iron pipes and ductile (nodular) cast iron pipes. Each type has different properties and applications. Regarding the connection methods, they can feature flexible joints, flange connections, self-anchored joints, rigid joints, and more. Flexible cast iron pipes use rubber rings for sealing, while flanged connections rely on flanges and rubber gaskets to ensure a tight seal. Rigid joints typically involve a socket in the cast iron pipe where the straight section is inserted and sealed with cement, though this method is now largely outdated due to its limitations in flexibility and durability. Today, modern alternatives like mechanical joints or flexible couplings are preferred for better performance and ease of maintenance.
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