MassPack is included with each LEAKNET system.
MassPack is a mass balance system incorporating dynamic correction for changes in line pack.
MassPack monitors all flow into and out of a pipeline segment. Once each minute the mass flow balance and the change in the fluid packed within the line are computed and accumulated in four accumulators operating over different time periods. The first accumulator looks at the line-pack-corrected mass balance over a user-selected interval of 1 to 99 minutes. The second accumulator monitors the previous hour. The third accumulator watches the previous 24 hours. The fourth accumulator can be user-set to watch either the entire proceeding month, or it can totalize the inflow volume until manually reset. This last option is useful for batch transfers and during loading or unloading of ships or tanks.
MassPack is tolerant of measurement inaccuracy. You may use custody transfer meters or the simplest of flow meters. Sensitivity, however, depends directly on the accuracy of the meters.
MassPack is a simple and reliable supplementary method for Stand-Alone use or as an effective partner with PPA.
MassPackprovides sensitive mass balance leak detection and incorporates dynamic compensation for changes in line pack.
Principle of Operation
All flows into and out of a protected segment are monitored. Once each minute the mass flow error is computed and accumulated. When the accumulated error indicates fluid is being lost and when the amount lost exceeds a warning or alarm setting, the operator is alerted. All warning and alarm limits are user configurable.
Pressure changes affect the quantity of fluid packed into the line. Pressure at each end of the protected segment is monitored and used to compute the corresponding changes in the line pack. These changes are used to adjust the mass balance errors so warnings and alarms are issued only as a result of an actual loss of fluid
MassPack is fault tolerant. If pressure readings for pack compensation are unavailable, it reverts to simple, uncompensated mass balance.
Each LEAKNET system includes the capability shown:
Flow Metering Equipment
MassPack works with any reasonable metering system. For maximum performance, flow should be measured to custody transfer accuracy and presented to MassPack as either mass flow rate or standard volumetric flow rate (e.g. 60 ° F barrels per hour).
Metered flows should be corrected for temperature by an external flow computer. MassPack does not include temperature compensation. The user may include a meter factor for each meter.
Pressure Measuring Equipment
Pressure should be measured to custody transfer accuarcy. (e.g. to the nearest 0.1 psi) using industrial quality pressure transmitters (e.g. Rosemount 3051).
Sensitivity and Detection Time
All mass balance leak detection relies on accumulating differences among inflow and outflow meters. The higher the meter accuracy the faster and more sensitive MassPack can be. MassPack is tolerant of low performance meters, but directly benefits from higher accuracy flow measurement.
Leak Detection Accumulators
MassPack includes four accumulators for each segment. These accumulators compute the net flow imbalance over different intervals of time.
MassPack is easily tuned to a specific pipeline. This is done by online measurements and without extensive research or calculations. Tuning values for 30 different operating configurations can be maintained online.
MassPack is a simple and reliable method for stand alone use or as an effective partner with PPA
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