MIL-STD-2199A APPENDIX A
c. Mask off the areas on the sleeve(s) that will not receive the covering system. This is typically about 6 inches from the sleeve end (see figure A-1).
d. Metal shaft body and sleeve end prep surfaces to be covered shall be abrasive blasted in accordance with
SSPC-SP 5 (see 3.1.13) with clean abrasive grit to achieve a 3-mil average profile.
MASK THIS AREA TO PREVENT DAMAGE DURING ABRASIVE BLAST
SLEEVE
ABRASIVE BLAST
FIGURE A-1. A typical shaft and sleeve configuration, prepped for the shaft covering.
e. Wash blasted surfaces with solvent, as required in A.3.1.1.b, after abrasive blasting; assure that no residue remains.
f. Pitting of the shaft steel shall be assessed and addressed as specified in the applicable shafting technical repair standard (TRS) or maintenance standard (MS) and/or S9086-HM-STM-010/243. Irregular surfaces shall be filled and smoothed as per 5.2.2. It is recommended that this effort be accomplished following application and cure of the first layer - primer. Subject areas shall be smoothed/blended to adjacent shaft surfaces with a squeegee.
g. Apply the primer (see A.3.2.1) as soon as possible (within 8 hours) after the abrasive blasting. Freshly blasted and cleaned surfaces shall be wrapped with plastic film or VPI paper in accordance with MIL-PRF-121, Type I, Grade A, Class 2 in extending the hold time up to a maximum of 24 hours prior to commencing primer application. If primer application cannot be started within either 8 or 24 hours, as applicable, or if there is evidence of oxidation, re-abrasive blast the shaft as outlined above.
NOTE: For those shaft sections not receiving the primer or elastomeric coating application (based upon their drydocking periodicities accordingly), wrap the blasted and cleaned surfaces with the plastic film or VPI paper in accordance with MIL-PRF-121, Type I, Grade A, Class 2 to prevent oxidation from occurring during transit from the blast and coat facility to the shop floor.
A.3.1.2 Preparation of waterborne shaft flange assemblies. Surface preparation for waterborne shaft flange assemblies will vary slightly based upon their respective configurations identified previously in 5.2.3. Regardless, the following does not apply to the AFT flange of CPP propeller shafts.
A.3.1.2.1 Shaft flanges enclosed within rotating coupling covers. Prepare the flanges for coating application as follows:
a. For in-service waterborne shafting or spare waterborne shaft assets whose flanges have not been previously coated, remove any residual preservative from the mating flange assemblies, extending up to respective sleeve ends by chemical/solvent cleaning with cloths and/or bristle brushes, or mechanical means such as abrasive blasting.
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