DNV DNV-CP-0248 [ Active ]

Scope and application

This programme is applicable for the approval of material manufacturers of:

— Wrought aluminium alloys,

as referred in the Society's rules and standards. For a description of general requirements, conditions and procedures related to the approval, please refer to DNV-CP-0346 which shall be applied in combination with this programme.

The product(s) used for approval testing (see Sec.3) will place limitations on the range of approval. The approval will be limited to each aluminium grade and temper, and each of the following manufacturing processes/product groups. For each product group, the approval is further limited to the parameters indicated as follows:

— rolled products

— maximum thickness

— heat treatment/delivery condition

— extruded products

— profile shape and type (open or closed)

— maximum thickness

— heat treatment/delivery condition

— drawn products

— maximum thickness

— heat treatment/delivery condition

— forged products

— maximum product mass

— maximum product thickness

— heat treatment/delivery condition.

Subject to agreement with the Society, soft/annealed tempers may be covered by the higher strength tempers., e.g. approval test of 6xxx alloys of temper T5/T6 may cover approval of the T4 temper, and approval test of 5xxx alloys of delivery condition H321 may cover the tempers O and H111.

Approval of the manufacturer may also be given for the additional condition “including low temperature service”, for the applicable grades after appropriate testing.

Approval will be given for the manufacture of products and materials in accordance with the DNV rule requirements. However, in the absence of relevant DNV rules and subject to agreement with the Society, approval may be given for the manufacture of products and materials specified in recognised standards.

Manufacturer’s own heat treatment facilities shall be evaluated and approved by the Society either under this approval program or as approved "heat-treatment workshop" through the separate approval programme DNV-CP-0351.

In case any manufacturing steps are performed by a sub-supplier, the Society may require corresponding approval of the sub-supplier where relevant.