scope:

Defence Standard (Def Stan) 02-304 Part 4 specifies the requirements for: 

Assessment of the rectification and repairs necessary to restore distorted, worn or corroded main propulsion shafts, couplings and sleeves to a serviceable condition; 

Performance of such treatment and repairs; 

Post-repair treatment and inspection. Shaft materials include carbon steel, stainless steel and non-ferrous alloys.

Individual requirements or limitations relating to shafts for specific vessels are included.

Rectification and repair techniques considered include:

Grinding;

Machining; 

Welding; 

Metal spraying; 

Straightening; 

Plastic coating. Post-repair operations include heat treatment, surface treatment and inspection. Acceptance standards are defined.

The requirement to raise and maintain a repair history document for each main propulsion shaft is stated.