STEAM- JACKETED KETTLES
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
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
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
Table 7-3.Common Troubles and Repair Recommendations on Steam-Jacketed Kettles and Other Steam-heated Equipment
Stuck open or closed
Leaks at stem
Broken or crushed
Stuck open or lifting
Every 6 months
No steam; valve stuck
closed; trap malfunctioning
Valve partly open or scored
Rapid changes in temperature
causing cracks; faulty weld
Joints made incorrectly; not
Leaks or condensation
No steam or too much steam;
packing too tight or valve
Packing not tight enough
Parts dirty or worn
Water soaked; stepped on
Parts dirty or worn
Leaks or corrosion
Check steam supply; free
Repair or replace valve
Raise heat slower, reweld
bust or crack
Unscrew, clean and repair
Repair and/or clean
Loosen packing gland or free
frozen valve stem
Disassemble, clean, and repair
Replace defective sections
Disassemble, clean, and
repair; clean and adjust
pressure every 6 months
Replace or repair valve
Clean and lubricate binges
Resurface or replace.
DO NOT REPLACE WITH
REGULAR GATE VALVE