MIL-STD-2199 Coverings For Waterborne Main Propulsion Shafting On U.S. Naval Surface Ships And SubmarinesThis standard covers standard practices for the application of a four-layer shaft covering system on the body areas of waterborne main propulsion shafting. Material and application requirements are also provided for coatings that are to be applied to waterborne shaft flange assemblies.

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MIL-STD-2199A APPENDIX A

NOTE: Once the shafts are installed on the ship, the flanges mated, and the coupling bolts installed and torqued, the elastomeric coating (see A.3.2.2) along with whichever corrosion protection layer was applied in step e above shall also be applied to the bolt heads and nuts as well as respective washer faces. The coating and protective layer shall also be applied around the entire circumferential mating joint of the flanges. This can be done by taking a small quantity of Parts A and B of the coating, mixing them in the proper ratio, and applying to the areas with a paint brush. After the coating is tack free it shall be spark tested. If there are any areas that spark, brush additional coating onto suspect areas. Following cure, the areas shall be spark tested again. Repeat as necessary until a satisfactory spark test is achieved. Then, apply the same protective layer to subject surfaces as done previously for the other flange areas.