MODUK DEF STAN 02-780: PART 2 PDF

This Def Stan relates to the requirements for the manufacture, inspection and testing of 70/30 Copper Nickel forgings, forging stock, rods, profiles and rectangular bar.

Forgings are placed in four classifications. Class 1 to 3 forgings are in descending order of quality assurance requirements. The classes are defined as follows:

Class 1 A forging whose failure would lead to uncontrollable flooding, the total immobilization of the vessel or serious hazard to personnel;

Class 2 A forging whose failure would lead to severe but controllable flooding, the serious disruption of weapon systems, main propulsion machinery, or its attendant auxiliaries including generators;

Class 3 A forging whose failure does not constitute an immediately significant hazard;

Class 4 Forging stock which can be either hot forged cast billet or hot worked by extrusion or rolling.

Rods are called for in two grades as follows:

Grade 1— Material for high integrity applications, (e.g. 1st level system in Nuclear Submarines);

Grade 2— Normal grade material;

NOTE Material below 9mm nominal cross section is usually free from harmful defects. Grade 2 material, (i.e. not ultrasonically or radiographically examined) will meet most applications for rods, profiles and rectangular bar below 9mm nominal cross section.