scope:

This NES defines the Non-Destructive Examination (NDE) requirements and minimum acceptance standards for welds in HM Surface Ships and Submarines at final inspection. It includes structural joints, welds in pipe systems, weld surfacing and cladding and fabrication welds in castings and forgings.

The NES also defines the levels of importance of piping systems (see Clause 1.4a.).

The acceptance standards herein are applicable to:

Welds produced by the following processes:

Manual metal arc (MMA).

Submerged arc (SM).

Metal Inert Gas (MIG).

Metal Active Gas (MAG).

Tungsten Inert Gas (TIG).

Flux cored welding (FCW).

Electroslag (ESW).

Oxy Fuel (OFW).

Plasma Arc (PAW).

Welds examined by the following methods:

Eddy Current.

Liquid penetrant.

Magnetic Particle.

Radiography.

Ultrasonic and

Visual examination.

The types of weld defects referred to in this NES are defined and illustrated in Annex C.

Excluded from the scope of this NES are:

weld repair of castings (covered by NES 745 Parts 1 and 2);

welds in nuclear primary systems and machinery for which reference is to be made to DGS-NAS-3;

welds made by high energy welding processes eg electron beam, plasma arc etc for which MOD(PE) is to be consulted on Acceptance Standards prior to the implementation of the respective process.