Source:
https://alllandpipes.com/product
Some pipelines combine multiple types of protection. For example, an internal FBE pipe coating may be used alongside external coatings such as 3LPE. An Allland epoxy-coated LSAW steel pipe can have liquid epoxy on the inside and a three-layer polyethylene coating on the outside. This combination protects against internal corrosion and external soil corrosion at the same time.


