Here are some of the most common questions we are asked. If you have additional questions, please contact one of our specialists at 972-699-8600 or [email protected].
No. Maintenance-free units do not require pre-charging. The dampening effect is created by the fluid introduced into the unit during regular operation.
This number of spares depends on use, application, charging frequency and levels. We recommend at least 2 spare cartridges per unit per year.
The typical life expectancy of cartridges is dependent on operating conditions, but generally, discharge units should last for 6+ months and suction units approximately 12 months.
The typical life of a cellular tube is 10-15 years in typical, non-aggressive service. We recommend use of a split shell design for in-line versions in order to facilitate easier replacement.
The typical life of a PDTA is 2-4 years, with a possible life of up to 10 years.
One of the major benefits of the flow-through style suction stabilizer is the effect of reducing acceleration head loss. If installed properly, this type of suction unit can virtually eliminate acceleration head by reducing the “L” value in the NPSHA formula. Reducing the L down to a couple feet from 20 feet will have significant impact on your available NPSH.
Yes, we offer these certifications and more. We have many units in these territories and other parts of the world. PPC is well equipped to provide the technical services necessary to obtain these stamps.
No, gas charged units are not shipped pre-charged.
The ideal pre-charge pressure is between 60 to 80% of the operating pressure. Note this requirement could be limited by the max pressure design of bladder/cartridge or nitrogen bottle. PPC considers pre-charge limitations when reviewing your application. If pre-charge cannot be met, PPC will provide alterative solutions that are equally effective.
The unit should be charged to the proper pre-charge pressure prior to the initial operation, when operating pressures vary and should be checked routinely.
The best location for the unit is as close to the pump as possible, but no further than 10 times the pipe diameter away from the pump, which is the industry guideline.
There is not a typical lifespan set for dampeners as it depends on the type of service. More corrosive services could consume the vessel wall thickness eventually bringing it out of ASME code compliance. Highly corrosive fluids could also affect the vessel’s internal components. However, we’ve seen Maintenance Free units in operation for 15-25+ years that continue to maintain their high performance level.
Yes! While PD Series discharge dampeners have proprietary internal dimensions and features, any bladder or bladder kit designed to fit the Hydril K Series are fully acceptable.
PPC’s typical warranty is 12 months on workmanship items only. This is not inclusive of operational parts designed to wear out.
Yes, in some cases it is possible to tie a single dampener to multiple pumps. This can be done by providing a dampener with multiple nozzles or using our manifold style dampener.
The approach for sizing suction stabilizers and discharge dampeners is a publicly available method that is well proven over many years. The equation and pump factors are found in John Miller’s book, The Reciprocating Pump, Theory and Design. Performance Pulsation Control utilizes this methodology for our standard quotations and performance analysis.
Pump specs, such as plunger/piston diameter, pump type, pump stroke length, suction operating pressure and discharge operating pressure, are required to properly size the pulsation equipment. Fluid type and fluid temperature are required to determine the appropriate construction material and elastomer selection recommendations.
PPC’s highest pressure design to date is 40,000 psig. We are capable increasing above this pressure limit if necessary. Our U2 certification allows us to produce ultra-high pressure applications at lower cost and less weight than a standard U stamp unit.
Industry standard practices for bolt torque specs apply to our units. These values can be found in the maintenance manual of our PD product.
Look for noticeable changes or shifts over time in performance of the pump system, i.e. shaking, vibration, loose fitting connections, etc.
Gas permeates through the rubber bladder material. Temperature and pre-charge pressures can influence the rate at which this occurs.