Repair & Maintenance Tools
Although any inert gas can be used to pre-charge the accumulator, we recommend to use high purity dry nitrogen gas only for pre-charge. Never use shop air or oxygen to avoid any risk of explosion. Accumulators are normally shipped with pre-charge pressure of 25 psi for shipping purpose only unless otherwise specified by the customer differently. Accumulator must be pre-charged to the required pressure prior to operation to avoid the risk of bladder failure when commissioning.
Our general recommendations for nitrogen pre-charge varies by application and are as follows.
- Energy Storage – 90% of the minimum system operating pressure.
- Shock Absorption – 60% -7 5% of the normal working pressure.
- Pulsation Dampening – 60% – 80% of the normal working pressure.
The above recommended pressures must be adjusted taking operating temperatures into consideration. Pre-charge pressure must be checked during first week in operation. Subsequent maintenance should be done 3 to 6 months depending on the severity of the application. High cycling and high temperature applications require maintenance every 3 months.
For optimum and reliable operation of accumulators, it is important to fill and maintain the correct nitrogen pre-charge pressure. We recommend checking pre-charge pressure regularly. Charging & gauging kits are designed to fit on a commercially available nitrogen bottles. Charging instructions are provided with charging kit for safe operation.