Page 158 - Root Cause Failure Analysis
P. 158
146 Root Cause Failure Analysis
4. WHEN THE VALVE
SETTlNG IS REACHED,
THE POPPET "OPENS" 7. VENT CONNECTION
LIMITING PRESSURE PERMITS UNLOADING
. IN UPPER CHAMBER. PUMP THROUGH
RELIEF VALVE.
2. IS SENSED ABOVE
PISTON AND AT PILOT 'IVERT OUTPUT 5. WHEN THIS
VALVE THROUGH DIRECTLY TO TANK. PRESSURE IS 20 psi
HIGHER THAN IN
ORIFICE IN PISTON. UPPER CHAMBER.. .
WEWA W A
CLOSED CRACKED RELIEW NG
Figure 10-15 Illustrates how a safety valve functions.
Operating Methods
Compressors can be hazardous to work around because they have moving parts.
Ensure that clothing is kept away from belt drives, couplings, and exposed shafts. In
addition, high-temperature surfaces around cylinders and discharge piping are
exposed. Compressors are notoriously noisy, so ear protection should be worn. These
machines are used to generate high-pressure gas so, when working around them, it is
important to wear safety glasses and to avoid searching for leaks with bare hands.
High-pressure leaks can cause severe friction burns.