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GRIFFCO Pulsation Dampeners
- Product Details
- Specifications
- Installation & Charging
GRIFFCO Pulsation Dampeners
Smooth, Steady Flow from a Dosing Pump
A dosing pump delivers chemical in bursts, one per stroke. A pulsation dampener on the pump’s discharge smooths those bursts into a near-steady flow, so the line does not hammer, flow meters and gauges read properly, and dosing at the injection point is even.
Inside, a flexible diaphragm separates the chemical from a cushion of air or nitrogen. The gas absorbs each burst and pushes the liquid on between strokes. A gauge and charging valve on top show the gas charge and let it be topped up.
Sizes and Materials
Eleven standard sizes from about 100 mL to 5.2 L, with ½” to 2″ (DN 15 – DN 50) connections. Bodies in PVC, CPVC, polypropylene, PVDF and Noryl® (to 10 bar), or 316 stainless steel, Alloy 20 and Hastelloy C for higher pressures. The diaphragm is EPDM as standard, with Viton®, Hypalon® or PTFE to suit the chemical.
Inlet Stabilisers
The same design, fitted on the pump’s suction side, helps the pump fill fully on every stroke where there is a suction lift, a long suction line or a high flooded head. Ask CHEMTROL® for details.
Specifications
| Item | Plastic Bodies | Metal Bodies |
|---|---|---|
| Body Materials | PVC, CPVC, polypropylene, PVDF, Noryl® | 316L stainless steel, Alloy 20, Hastelloy C |
| Volumes | About 100 mL – 5.2 L | About 120 mL – 5.2 L |
| Connections | ½" – 2" (DN 15 – DN 50): NPT; BSPT, socket, union or flange optional | ½" – 2": NPT; BSPT or flange optional |
| Maximum Pressure | 10 bar (150 psi) at 21 °C | 17 bar (250 psi) at 21 °C; high-pressure versions available |
| Maximum Temperature | PVC 60 °C; CPVC, PP 79 °C; PVDF, Noryl 107 °C | Set by the diaphragm |
| Diaphragm | EPDM (–51 to 138 °C) standard; Viton®, Hypalon® or PTFE optional | |
| Gauge and Charging Valve | Brass standard, 316 SS optional; 0 – 11 bar gauge standard, other ranges optional | |
| Gas Charge | About 80% of line pressure; air up to 10 bar, nitrogen above | |
| Approvals | PVC: NSF/ANSI 61 | – |
Sizes (plastic bodies)
| Model | Volume | Connection | Overall Height |
|---|---|---|---|
| PD0011 | 98 mL | ½" (DN 15) | 214 mm |
| PD0012 | 164 mL | ½" (DN 15) | 251 mm |
| PD0013 | 246 mL | ½" (DN 15) | 288 mm |
| PD0021 | 262 mL | ¾" (DN 20) | 245 mm |
| PD0022 | 475 mL | ¾" (DN 20) | 309 mm |
| PD0023 | 688 mL | ¾" (DN 20) | 372 mm |
| PD0031 | 590 mL | 1" (DN 25) | 259 mm |
| PD0032 | 1.31 L | 1" (DN 25) | 363 mm |
| PD0033 | 2.05 L | 1" (DN 25) | 467 mm |
| PD0042 | 2.62 L | 2" (DN 50) | 343 mm |
| PD0043 | 5.24 L | 2" (DN 50) | 527 mm |
Installation
- Fit on the discharge side, as close to the pump as possible (within 10 pipe diameters), after the pressure relief valve.
- Mount vertically where possible, with an isolation valve so the diaphragm can be changed without draining the line.
- Do not screw metal pipe into a plastic dampener.
- A back pressure valve downstream keeps at least 0.5 – 0.7 bar on the line, which the dampener needs to work well.
Charging
- Install the dampener first, then charge it, then pressurise the system.
- Charge the gas side to about 80% of the line pressure.
- Use compressed air up to 10 bar, dry nitrogen above that. Never use oxygen.
- Fine-tune until the gauge needle is steadiest, and check the joints for leaks with soapy water.
Applications
- Discharge of diaphragm and piston dosing pumps: chlorine, coagulants, acids, caustic and pH correction
- Water and wastewater treatment, process water and cooling towers
- Long discharge lines, and lines with flow meters or gauges
- Used with a back pressure valve, pressure relief valve and calibration column
