
16 17
pre-operation
PRESSURE VESSELS
Air receiver tanks and other pressure containing vessels such as, but
not limited to, pulsation bottles, heat exchangers, moisture separators
and traps, shall be in accordance with ASME Boiler and Pressure Vessel
Code Section VIII and ANSI B19.3 Safety Standards.
CAUTION
ASME coded pressure vessels must not be modified, welded, repaired,
reworded or subjected to operation conditions outside the nameplate
ratings. Such actions will negate code status, affect insurance status
and may cause severe personal injury, death, and property damage.
CAUTION
The installation, wiring, and all electrical controls must be in ac-
cordance with ANSI C1 National Electric Code, ANSE C2 National
Electric Safety Code, state and local codes. All electrical work should
be performed by a qualified electrician. Failure to abide by the national,
state and local codes may result in physical and/or property damage.
DANGER
Failure to properly size, set & install pressure relief valves can be fatal.
SAFETY VALVES
Safety valves are pressure relief valves and should be sized and
purchased with a pressure setting to protect the weakest link in the
system. Never change the pressure setting, only the safety valve
manufacturer is qualified to make a change. Safety valves are to be
place ahead of any potential blockage point which included but is not
limited to, shutoff valves, heat exchangers, pulsation dampeners, and
discharge silencers.
DANGER
Safety valves are to protect system integrity in accordance with ASME
Codes and ANSI B19.3 safety standards. Failure to use safety valves
of the proper capacity and pressure will cause severe personal injury or
death.
NOTICE
Standard motors are open drip proof with a maximum ambient
temperature rating of 104 degrees F. They are not suitable for salt
laden, corrosive, dirty, wet, or explosive environments.
PRESSURE SWITCH
The pressure switch is automatic in operation and is adjusted to start
and stop the unit at the minimum and maximum desired air receiver
pressure by cutting in and out the power to the electric motor. On some
models, the pressure switch incorporates a release valve, which releases
air between the check valve located in the receiver and discharge valve
in the head of the compressor.
ELECTRICAL
Before installation, the electrical supply should be checked for adequate
wire size and transformer capacity. During installation a suitable fused or
circuit breaker disconnect switch should be provided. Where a 3 phase
motor is used to drive a compressor, any unreasonable voltage unbal-
ance between the legs must be eliminated and any low voltage corrected
to prevent excessive current draw. Compressors must be equipped with
a properly wired magnetic motor starter or a pressure switch rated to
carry the full motor current load. The coil which engages and disengages
the contact points in the motor starter is controlled by the pressure
switch. Never attempt to bypass the pressure switch or adjust it past the
factory set pressure range. Improper installation of the electrical system
can cause the motor to overheat or a short circuit to occur.
CAUTION
Electric power always exists inside the pressure switch when there is
electric power at the compressor package. Either a qualified electrician
should make the pressure adjustments or the electric power supply
should be disconnected and locked out before making any adjustment.
NEVER exceed the designed pressure for the system or overload the
motor beyond its service factor. FAILURE TO HEED THESE WARN-
INGS MAY RESULT IN SERIOUS INJURY OR DEATH, PROPERTY
DAMAGE AND/OR MECHANICAL FAILURE
pre-operation
CAUTION
Relieve compressor and system air pressure by opening the appropri-
ate manual relief valve prior to servicing. Failure to relieve all system
pressure may result in severe personal injury, death & property damage.
GUARDS
All mechanical action or motion is hazardous in varying degrees and
needs to be guarded. Guarding shall be in compliance with OSHA
Safety and Health Standards 29 CFR 1910.219 in OSHA manual 2206
and any state or local code.