1- Long type EF Coupler for insulating pipe
2- Calculate the touching zone of coupler and mark on the pipe
3- To remove the oxide layer scrape the pipe surface
4- Clean the area that you was scraped before with an appropriate chemical. (Trichloroethone or alcohol)
5- Insert the coupler on the one side of the pipe
6- Weld the steel pipes by using electrical welding
7- After electrical welding slide the coupler to the other side
8- Make the electrofusion welding
9- Fill the insulating material from the hole of the coupler and fit the cap on the coupler