MIL-STD-2199A
3.2.23 SSPC-SP - Steel Structures Painting Council Surface Preparation
3.2.24 TRS - Technical repair standard
3.2.25 VOC - Volatile organic compound
3.2.26 VPI - Vapor phase inhibitor
4. GENERAL REQUIREMENTS
4.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life-cycle costs.
4.2 Personnel. Before being assigned the task of applying the four-layer shaft covering system, personnel shall have the following background and experience:
a. Materials. General knowledge of the characteristics of the materials.
b. Shaft and sleeve preparation. An understanding of the need for the proper shaft and sleeve surface preparation, including abrasive blasting and degreasing, for obtaining acceptable resin adhesive bond.
c. Covering application. The skill required for uniformly applying each of the four layers as described in
Appendix A. This shall include the operation of plural component spray equipment.
d. Quality control and inspection. Experience in determining, by visual inspection and the tests specified herein, whether the covering has been properly applied, is void free, and has a continuous adhesive bond to the shaft and sleeve.
4.3 Facilities, tools, and equipment. Facilities shall be required to provide a clean, dry, ambient temperature environment during application of each of the four layers . To ensure the safe and proper application of the shaft covering as described herein, equipment and tools shall be required to perform the tasks of abrasive grit blasting, mixing and applying the shaft preservation materials, and performing specified tests.
4.4 Shaft covering system performance. The applied shaft covering system shall prevent corrosion of waterborne propulsion shafting for a period of 15 years. The individual layers of the four-layer covering system shall meet the following performance requirements:
a. Primer - The primer shall preserve the abrasive-blasted substrate, prepare the substrate for adhesion of the elastomeric coating, and prevent corrosion of the steel shaft should water penetrate the elastomeric coating during service.
b. Elastomeric coating - The elastomeric coating shall not crack under torsional shaft loads.
c. Sealing/fairing compound - The sealing/fairing compound shall prevent cracks from forming at the shaft/sleeve interface. It shall also be used as a filler material for shaft surface irregularities.
d. GRP - The GRP shall protect the first three layers of the covering system from abrasion, erosion, and foreign object contact damage.
5. DETAILED REQUIREMENTS
5.1 Materials. The four layer shaft covering system shall include (in sequential order): 1) primer, 2)
elastomeric coating, 3) sealing/fairing compound, and 4) GRP.
NOTE: Except for aircraft carriers, surface ship classes adhering to a dry dock periodicity of 10 years or less may omit the first and second layers (i.e., primer and elastomeric coating, respectively) of the covering system . All four layers of the covering system shall be applied to the waterborne shaft sections of aircraft carriers.
5.1.1 First layer - primer. The first layer of the shaft covering system shall be a one-component, low-viscosity primer for polysulfides in accordance with A-A-59875, Type I.
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