Pulsafeeder Pre-Engineered Skid Systems - Manual (Page 16)

Pre-Engineered Skid Systems
Installation, Operation and Maintenance Manual
PES00039, Rev. B System Components and Settings Page 16
Pulsation Dampener
Positive displacement pumps will create pressure pulsations in the discharge line which can be
damaging to piping or system components. A pulsation dampener utilizes an air chamber separated
from the pumped liquid by a diaphragm to cushion any pulsation(s) and provide a steady flow.
The air pressure in the Pulsation Dampener is generally set at
80% of the system operating pressure. If system pressure is
lower than the Back Pressure Valve setting, use 80% of the
Back Pressure Valve setting.
Air can be introduced to the Pulsation Dampener through the air
fitting. This fitting can also be used to adjust and to relieve air
pressure. It is strongly recommended that the pressure in the air
chamber be completely relieved prior to performing any
maintenance on the skid system. An air pressure gauge is
provided on the Pulsation Dampener itself to indicate pressure
present in the air chamber.
When the pump is shut off, the Pulsation Dampener
and discharge piping will have residual pressure in
it. Use extreme caution when opening valves to
drain and/or vent the system since you must bleed
off this residual pressure.
Setting Valves
Prior to setting the Pressure Relief Valve (PRV) and the Back Pressure Valve (BPV), thoroughly
review and familiarize yourself with the instructions for valve operation.
Prior to setting valve pressure, the skid discharge piping should be filled with liquid.
1. Set Pulsation Dampener air pressure (see above).
2. Adjust PRV and BPV to their lowest pressure settings (fully open).
3. Adjust Skid Discharge Valve and/or system piping to allow venting from the skid discharge
piping.
4. With pump primed, run pump until air is evacuated from the skid discharge piping.
5. Shut off pump.
Figure 13
Pulsation Dampener Internals
Air Charge
Connection
Pressure
Gauge
Dampener
Body
Figure 14
Typical Pulsation Dampener
(courtesy Blacoh)
!
CAUTION