Castings manufactured to this specification are intended for use in the fabrication of offshore structures@ manufacture of critical marine or mechanical or other system components intended for application on permanent offshore structures@ or for components used in the construction of offshore tendons@ risers and pipelines. If national and/or local regulations exist in which some of the requirements may be more stringent than in this specification the contractor shall determine which of the requirements are more stringent and which combination of requirements will be acceptable with respect to safety@ environmental@ economic@ and legal aspects. In all cases@ the contractor shall inform the purchaser of any deviation from the requirements of this specification which is considered to be necessary in order to comply with national and/or local regulations.