BOILERS AND ECONOMIZERS

Machinist’s Mate Fireman Steven Kuhn prepares a burner in USS Kitty Hawk’s (CV 63) number 4B boiler.
U.S. Navy photo by Photographer’s Mate Airman Theron J. Godbold. (RELEASED)

Overview

Coating systems described in this section are designated for application on boilers and economizers (except components used for heat transfer), machinery casings, and ferrous sheet metal.

Typical Coatings Used

Boilers and economizers (except components used for heat transfer), machinery casings, and ferrous sheet metal are coated with one coat of Amercoat 829HS, which is a polysiloxane material specifically formulated for high temperature service. Note however that Amercoat 829HS shall not be used on any equipment that exceeds a surface temperature of 700ºF. A TT-P-28 Type I paint (a silicone based, aluminum pigmented, heat-resistant coating) can also be used by ship’s force for coating boilers and economizers (except components used for heat transfer), machinery casings, and ferrous sheet metal.

Surface Preparation

To ensure coating adhesion, special attention should be paid to the surface preparation in accordance with NAVSEA Standard Item (NSI) 009-32. Surfaces should be prepared in accordance with SSPC-SP 11 Power Tool Cleaning to Bare Metal.

Depot Repairs

NSI 009-32 is the governing document for preservation requirements. Permitted coatings are specified in Table 5.

Ship’s Force Repairs

Ship’s force personnel are responsible for maintenance of boiler and economizer coating systems until repair activity maintenance is scheduled. Naval Ships Technical Manual: Chapter 631 (NSTM 631), Preservation of Ships in Service – General, Tables 631-1-3 and 631-8-8 provide requirements, instructions, and guidance for surface preparation and coating application.

New Construction Installation

New construction ships are painted in accordance with the ship build specification for that class of ship