This document specifies requirements for project specific product and process qualification of field applied wet thermal insulation systems applied at interfaces (e.g. field joints) and pre-fabricated insulation in the petroleum and natural gas industries. This document is applicable to wet thermal insulation systems submerged in seawater. This document is not applicable to: — the project qualification of anticorrosion coatings or the requirements for application thereof; — thermal insulation in the annulus of a steel pipe-in-pipe system.