Pulsafeeder Pulsar Shadow - Manual (Page 51)

45
Installation
On both discharge and suction lines, it is desirable to mount the PULSAtrol as close to the pump
connection as possible. It can be mounted in any position: horizontally, vertically, or at any angle. A
shutoff valve should always be used between the piping system and PULSAtrol. If the discharge line is
open to atmospheric pressure, a backpressure valve should also be incorporated in the system near the
PULSAtrol to assure proper operation. Pulsation dampeners do require regular maintenance and
inspection. Charge pressure should be checked every 2-4 months and renewed as needed. Temperature,
pressure, and other variables will affect charge life and diaphragm/bladder life.
A) Discharge Setup
The PULSAtrol may be precharged with air or nitrogen. When properly precharged the diaphragm is
positioned against the bottom liquid chamber. It is therefore necessary to drain all liquid below the
diaphragm and vent to atmospheric pressure when precharging.
Use the precharge pressure as determined from the PULSAtrol selection and sizing procedure (Catalog
No. 211). This can vary from 50 to 80% of mean line pressure in accordance with fluctuation level
selected. The PULSAtrol is now ready for service and the diaphragm will move to a neutral position as
liquid enters the chamber.
Use the following to complete a Pre Charge Procedure for Discharge Installation
1. Calculate the precharge pressure
a) Mean Line Pressure (PSIG) + Atmospheric Pressure = Absolute Pressure (PSIA)
b) Absolute Pressure (PSIA)
x
Precharge Percentage (80% max)
=
Pressure Absolute
c) Pressure Absolute – Atmospheric Pressure = Precharge Pressure (PSIG)
2. Isolate PULSAtrol from line.
3. Carefully drain off process fluid by opening a drain valve (see recommend piping arrangement).
4. Apply precharge pressure (additional liquid may drain as diaphragm moves).
5. Close drain valve.
6. Place PULSAtrol in stream.
B) Suction Setup (Flooded Suction)
Charge the PULSAtrol with adequate pressure to overcome the static suction head. Start up the pump.
Depress the stem on the charge valve, but only during discharge strokes of the pump, until the gauge
indicates pressure pulses. The diaphragm has now centered allowing the PULSAtrol to accumulate
liquid while the pump is discharging. If too much air becomes released and the gauge will not indicate
pressure pulses, recharge the PULSAtrol and repeat the procedure.
Use the following to complete a Pre Charge Procedure for Suction Installation
1. Isolate accumulator from line.
2. Carefully drain off process fluid by opening a drain valve (refer to Figure 24).
3. Apply 5-10 psi precharge pressure (additional liquid may drain as diaphragm moves).
4. Close drain valve.
5. Bleed off all pressure on the PULSAtrol.
6. Open the valve to put PULSAtrol in stream.
7. Push in on the stem of the charging valve during the discharge stroke of the pump and release during
the suction stroke.
8. Continue this for about 10 times and observe the compound gauge. As accumulator functions, the
needle will go from pressure to vacuum.