AUXILIARY, TRIM AND SEAWATER EXPANSION TANKS
Submarine auxiliary tanks, depth control tanks, NFO expansion tanks, seawater expansion tank, trim tanks and water round torpedo (WRT) tanks are subject to immersion conditions in an environment extremely receptive to corrosion. These tanks are frequently filled with and emptied of seawater and require adequate corrosion protection by use of anti-corrosive coatings. Submarine tanks may be structurally complex. Typical estimating methods for paint volume usage and labor may not be accurate, as the surface area to be painted may be as much as double the flat plate wall area due to complex geometry. Access to areas of a tank may need to be coordinated with the contracting facility long before work commences to coordinate support. Products used for the primer or single coat shall contain Optically Active Pigment (OAP). The coatings applied in these areas are MIL-PRF-23236 TY VII Class 7/18.
To ensure proper coating adhesion, special attention should be paid to surface preparation of this area. All surface preparation work must be accomplished in accordance with NAVSEA Standard Item (NSI) 009-32 and Submarine Maintenance Standard (SMS) 6310-081-015 – Submarine Preservation.
For Depot repairs, refer to NSI 009-32 and the Submarine Maintenance Standard (SMS) 6310-081-015 – Submarine Preservation. NSI 009-32 is the governing document for preservation requirements.
These tanks are usually not entered by submariners between availabilities but if they need to enter for any reason Naval Ships’ Technical Manual: Chapter 631 (NSTM 631), Preservation of Ships in Service – General provides requirements, instructions, and guidance for surface preparation and coating application.
New construction submarines are painted in accordance with the submarine build specification for that class of submarine.
SUBMEPP provides centralized life-cycle maintenance solutions and support for U.S. Navy submarines and submersibles. SUBMEPP is under the Submarine Directorate of the Naval Sea Systems Command (NAVSEA).
The Naval Sea Systems Command (NAVSEA 05) is the technical authority for in-service submarine preservation-related work.
Naval Sea Systems Command, SEA 05