MIL-STD-2199A APPENDIX A
A.1 SCOPE
PROCEDURE FOR APPLYING THE FOUR-LAYER SHAFT COVERING SYSTEM
A.1.1 Scope. This appendix details the procedure for applying the four-layer shaft covering system outlined within this standard. This appendix is a mandatory part of this standard. The information contained herein is intended for compliance.
A.1.2 General description. After proper shaft surface preparation (see figure A-1), a coat of primer shall be applied uniformly to the shaft (see figure A-2). The primer dries in about 30 minutes. After the shaft is dry, the two coats of elastomeric coating shall be applied (see figure A-4), ideally by plural component reaction spray. After a minimum of 24 hours in the blast and coat facility, the shaft section shall be wrapped and moved to the area for application of sealing/fairing compound and GRP . While the shaft is turning, sealant shall be applied to the sleeve ends (see figure A-1) with a squeegee (or other similar application tool selected by the trades personnel). Sealing/fairing compound shall fair the shaft, and cover the sleeve up to the point where GRP is applied. The
sealant shall also be applied about six inches down the shaft. After a minimum of 2 hours, the GRP shall be applied (see A.3.2.4). The first ply of glass tape is then wound spirally on the shaft, butting the edges. After working out entrapped air and ensuring that the glass tape is wet-out properly, a coat of resin shall be applied over this ply. A second ply of glass tape shall then be wound on the shaft, reversing the direction of the spiral wrap. This process shall be continued until four plies of tape have been applied. Safety precautions (see 5.4) shall be observed in the handling and application of these materials.
NOTE: Accept 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.
A.2 APPLICABLE DOCUMENTS
A.2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this appendix. This section does not include documents cited in other sections of this appendix or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this appendix, whether or not they are listed.
A.2.2 Government documents.
A.2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks
form a part of this appendix to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-PRF-121 - Greaseproof, Waterproof, Flexible, Heat-Sealable Barrier Materials
MIL-PRF-680 - Degreasing Solvent
MIL-PRF-23236 - Paint Coating Systems, Fuel and Salt Water Ballast; (Metric) MIL-DTL-24441 - General Specification for Epoxy-Polyamide Paint
MIL-PRF-24647 - Paint System, Anticorrosive and Antifouling, Ship Hull
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or https://assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
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