Prognosis is a unique, powerful, industrially proven and patented condition based monitoring (CBM) solution for Differential Pressure (DP) meters provide real time malfunction alerts and hence GREATLY reduce the risk of exposure due to mis-measurement.
As well as providing assurance of the meter accuracy any standard DP Meter (Orifice, Venturi, Cone, Wedge,Flow Nozzle etc.), Prognosis can be used as a basis for a Condition Based Maintenance strategy as encouraged in the UK by Department Of Energy and Climate Control (DECC)*
It has been proven in both independent laboratory tests and on live Field Trials in both the UK and the USA, and has been adopted by major Oil and Gas operators around the world for use on both fiscal and non-fiscal DP meters, onshore and offshore.
The following is an extract from the latest UK Government DECC Guideline Notes for Petroleum Measurement:
“The use of diagnostic systems based on the use of an additional measurement of the fully-recovered pressure is gradually becoming well established. Experience has shown that this technique enables the Operator to detect significant deviations from normal operating conditions as they arise. It may therefore form the basis of a condition-based maintenance strategy; DECC has already agreed to the adoption of such a strategy at a major UK terminal. Operators of new developments are strongly encouraged to consider the adoption of such a strategy. The provision of an extra pressure tapping costs relatively little at the design and manufacturing stages, but may permit significant operational savings to be made during the life of the field.”
Prognosis - How does it Work?
An additional downstream pressure tap allows measurement of 3 different DP values across the meter body (rather than the traditional single DP).
Prognosis software uses these three DP readings along with other process data and meter geometry data to calculate 7 different diagnostic results which are compared with allowable uncertainties to assure correct meter operation. The calculations are based on well understood fluid mechanics principles and published industry standards – further details are available within white papers located in the download section of this website.
A simple live diagnostics plot is shown on the Prognosis software user interface:
- Alarms are raised when results indicate incorrect meter operation
- The system is able to distinguish between a primary meter body based physical problem and a secondary instrumentation problem
- Where a system fault condition cannot be precisely diagnosed, alarm descriptions “shortlist” potential problems
- Multiple meters can be monitored from a single software interface
- Diagnostic results and alarm statuses can be transmitted to higher level supervisory / control systems or emailed accordingly
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Supplied by DP-Flow