750-382
CBT
5-11
Safety valve
5.8 — Safety valve
The safety valve is an important safety device and deserves attention accordingly. Follow the recommendations of
your boiler inspector regarding valve inspection and testing. The frequency of testing, either by use of the lifting
lever or by raising the steam pressure, should be based on the recommendation of your boiler inspector and/or the
valve manufacturer, and should be in accordance with Sections VI and VII of the ASME Boiler and Pressure Vessel
Code.
Avoid excessive operation of the safety valve; a valve that is opened too frequently can develop leaks. Safety valves
should be operated only often enough to assure that they are in good working order. When a pop test is required,
raise the operating pressure to the set pressure of the valve, allowing it to open and reseat as it would in normal
service.
Do not hand operate the valve with less than 75% of the stamped set pressure on the underside of the disc. When
hand operating, be sure to hold the valve in an open position long enough to purge accumulated foreign material
from the seat area and then allow the valve to snap shut.
5.9 — Troubleshooting
The Falcon lockout and alert histories (full modulation units) contain information which can help in determining
the cause of problems. To view the lockout/alert history, first press the alarm banner, then press the appropriate
button in the pop-up window.
FIGURE 5-11. Safety valve
Alarm
banner
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history
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