The ”BelmaFlex” electro welded joint is a normal shrink sleeve which is mounted
at the pre-insulated pipes before these are welded together.

The “BelmaFlex” electro welded joint is certified according to EN489.

Certificate (link)

Mounting of “BelmaFlex” electro welded joints must take place only after the relevant
engineers have passed a welding test made by  “BelmaFlex” instructors.