Kettles require, as a minimum, monthly inspections. Figure 7-4 illustrates an arrangement of shipboard steam-jacketed kettles. An annual preventive maintenance inspection is also important. Here are a few factors to keep in mind while inspecting steam-jacketed kettles.

When making a MONTHLY inspection, check the draw-off faucets, valves, and piping for leaks. Check the steam pressure-reducing valve to ensure it is in good condition and is functioning properly. Lubricate the hinges of the kettle cover with mineral oil.

During the ANNUAL inspection, check each kettle for leaks, cracks, and dents. Examine the cover, hinges, and latch for warp and alignment. Check the steam piping and the condensate piping, the valves, and the traps for leaks and obstructions. Remove the safety valves; then clean, lubricate, and calibrate them before reinstalling. Remove any rust and corrosion by using Navy approved solvents. Other than visual inspections, each individual piece of galley equipment requires its own type of preventive maintenance.

During each ships regularly scheduled overhaul, steam-jacketed kettles should be tested using the following procedure:

1. Put each kettle into a cold-water pressure test of 90 psi for not less than 30 minutes.

2. Check the safety valves on each kettle. The testing of safety valves should he covered by the PMS. In general, kettle safety valves are set to release at a pressure of 45 psig.

3. Replace kettles that are cracked, badly pitted, or bulge under a pressure test.

4. Replace all malfunctioning safety valves.

Table 7-3 shows some common troubles and repair recommendations on steam-jacketed kettles and other steam-heated equipment.

Table 7-3.Common Troubles and Repair Recommendations on Steam-Jacketed Kettles and Other Steam-heated Equipment

Figure 7-5.Semiautomatic singie-tank dishwasher machine for use in and messes.