What are the classifications of the coating methods of large-diameter water-conveying plastic-coated steel pipes

The coating methods of large-diameter water-conveying plastic-coated steel pipe plastic-coating equipment are divided into two categories: simultaneous internal coating and external coating, and separate internal coating and external coating.

Process coating methods are also divided into two categories: internal coating first, then external coating; first external coating, then internal coating.

There are five types of internal coating methods: well coating, non-static gun extension rod spraying, non-static powder pump push-pull rod spraying, powder coating, and vacuum suction coating.

There are four types of external coating methods: well coating, electrostatic spraying, fluidized bed dip coating, and waterfall coating.

There are two types of internal and external coating at the same time: well coating (internal coating and external coating) and fluidized bed dip coating (external dip coating, internal non-static powder pump push-pull rod spraying).