Inner EP coated is not cooled by water when it is produced. When the outer PE coated is produced, the curing furnace is not heated. This is also their difference.
The sand blasting pipe will be placed on the rack, and the dust on the inner wall of the Inner EP Outer PE Coated Steel Pipe can be blown down by compressed air, put pipe into preheating furnace to preheat with a chain. For the epoxy coating, the preheating temperature is 160-200 degrees. For polyethylene coating, the preheating temperature is 240-330 degree. The preheating time are all the 8-12 min. We should maintain preheat furnace temperature uniformity, especially when coated with polyethylene, if the local preheating temperature exceeds the specified value, it is easy to aging or burning the coating. If the local temperature lower than the specified value, the coating will be poor smoothness.
Our Anti-corrosion Steel Pipe have many process: epoxy coated steel pipe, polyethylene coated steel pipe, 3 layer PE steel pipe, etc, all have high quality and best price.