Pipeline Monitoring

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The monitoring functions provide operators with a wealth of information directly from VariSim installed in the real time environment including trends and profiles of all available parameters. 

  • Age of product
  • Bulk Modulus
  • Critical Pressure and Temperature
  • Density
  • Dynamic Viscosity
  • Elevation
  • Free Gas
  • Flowrate (Mass and Volumetric) 
  • Gas Compressibility
  • Gas Composition (molar or weight)
  • Gas Molar Weight
  • Gas Heating Value
  • Heat Capacity at constant Pressure
  • Heat Capacity and constant Volume
  • Potential Head
  • Maximum Potential Head Generated
  • Minimum Potential Head Generated
  • Pressure
  • Maximum Pressure Generated
  • Minimum Pressure Generated
  • Primed (showing pipe full / empty)
  • Temperature (fluid, wall, lagging and external)
  • Thermal Expansion
  • Vapourisation Pressure
  • Velocity
  • Wavespeed
  • Wobbe value

 

 

 

In addition, VariSim can track and mix variations in fluid properties throughout a pipeline or network. Tracking is an inherent component of the simulation process and is essential if the fluid properties are known to vary (base density, base viscosity etc.).

Product advancement is not just calculated on the amount of volume that has entered the pipeline, VariSim calculates the movement of the product based on the local velocity which means that product compression and expansion is fully taken account of.

Tracking includes physical and virtual (non physical) components. Physical components can include pigs, chemical inhibitors, DRA, batch separators etc. Once they have entered the pipeline, the operator can monitor the progress and analyse the device / additive as it moves along the pipeline. Virtual components includes non-physical components such as Batch information, quality indicators, ownership, inject volumes needed, operator marked etc. For all components, the location, the age and the estimated time of arrival at receipt points is calculated.

PIPELINE EFFICIENCY

The pipeline efficiency function monitors the deterioration in the pipelines condition. This may occur as a result of pipe wall deterioration, detritus build up, waxing, hydrate formation etc. If the efficiency falls below an allowable threshold, an alarm or event can be raised that can be used by the operator to signify the need to scrape (pig) the pipeline.

MAINTENANCE SCHEDULING

The maintenance scheduler monitors the instrumentation installed on the pipeline / network. In its simplest form, it provides clear output to the operator advising of the date that instrumentation was last maintained. It raises events for the operator advising of the next scheduled maintenance date and alarms if the due date expires. It is totally configurable by the operator and can be updated as and when required.

In its more advanced form, the instrumentation can be monitored for drift by comparing its calculated output against other instrumentation data or calculated data provided by VariSim. This feature links with the historian process to allow detailed performance analysis over extended time periods. It makes use of the powerful data assessment tools for identifying long term drifting, drop outs and 'jumps ' in measurement. The instrument analysis process helps improve the quality of the measured data that is presented to an operator and has the unique advantage of being able to use simulated data from VariSim in its analysis process. This not only improves the reliability of the SCADA data that the operator uses in the day to day decision making process, it also serves to identify anomalies in the behaviour of a pipelines operation and improves the accuracy of VariSim simulator. This in turn improves the accuracy of the applications that surround VariSim such as leak detection.