The coated field joint area is often viewed as the weak link in corrosion mitigation. A poor
quality coating system applied to the field-joint area only adds to this weakness. Field-joint
coatings require special attention because of application limitations, compatibility of mainline
coating, timing constraints, and variable environmental conditions. A new Protective Network
Coating (PNC) is being investigated that may provide an enhanced coating system for offshore
field joints helping to better protect pipe assets in global offshore projects.
The PNC technology has the ability to adhere to fusion bonded epoxy coatings without the
need for a polyolefin adhesive. PNC is also compatible with polypropylene leading to a
seamless system between the mainline coating and field joint coating. This paper reviews the
development of a new 3LPP field joint coating system.
Keywords: high temperature coating, field joint, fusion bonded epoxy, three layer
polypropylene coating, offshore