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.
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.
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.
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.
PPC’s typical warranty is 12 months on workmanship items only. This is not inclusive of operational parts designed to wear out.
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.
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.
Look for noticeable changes or shifts over time in performance of the pump system, i.e. shaking, vibration, loose fitting connections, etc.