The QTR is the set of unedited historical data and information supporting the accounted quantity or quantities of volume, mass, or energy. The QTR will be identified by a unique identifier denoting a specific electronic metering device and primary device.
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The QTR shall be collected and stored with enough resolution to allow recalculation within 50 ppm per API MPMS Ch. 14.3, Part 4. This can generally be achieved using single precision data.
5.2.1 Rounding and Reporting
QTRs should be collected and stored in non-rounded floating point or integer form. For reporting purposes these items may be displayed as rounded values but all calculations on the report should use the non-rounded values. Units of measure shall be displayed with each value reported, as appropriate.
5.2.2 QTR for Differential Type Meters
The QTR is the flow time linear average and summation of data collected and calculated during a maximum of 60 consecutive minutes. (See Annex B.4, Calculation of QTR Averages.) A QTR shall end, and a new record begins, at the end of each hour. This is a minimum requirement and shorter record intervals are acceptable.
There shall be a minimum of 24 hourly QTR’s for each contract day (except for spring adjustment of daylight savings time where 23 hours are allowed). Additional QTR’s may exist each time one or more constant parameters are changed.
The following data shall be contained in the QTR for each period:
— date and time or date/time identifier;
— quantity (volume, mass and/or energy);
— flow time;
— Integral value/Average extension;
— differential pressure average;
— static pressure average;
— temperature average.
Relative density, energy content, composition, and/or density averages shall be included if they are live inputs.
NOTE 1 Where possible, DPIV should be calculated by the flow computer or host and stored as part of the QTR. (See Annex K for an example of using DPIV to recalculate a QTR)
NOTE 2 Additional QTRs may exist each time one or more constant parameters are changed.
For EGM systems using off-site calculations, the minimum data set generated onsite shall include:
— date and time or date/time identifier;
— flow time;
— Integral value/Average extension;
— differential pressure average;
— static pressure average;
— temperature average.
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5.2.3 Daily QTR for Differential Type Meters
The daily QTR is the flow time linear average or summation of QTRs calculated during a contract day (See Annex B.4, Calculation of QTR Averages). A daily QTR will end and a new daily record will begin at the end of each contract day.
The summation of the hourly values shall be equal to the daily report totals within the resolution of the flow computing system. If time or contract hour changes are made during a contract day, the affected totals from the EGM may not be the same; however, the final reported daily values shall match the sum of the hourly records.
The following data shall be collected in the daily QTR for each daily period:
— date and time or date/time identifier;
— quantity (volume, mass, and/or energy);
— flow time;
— Integral value/Average extension;
— differential pressure average;
— static pressure average;
— temperature average.
Relative density, energy content, composition and/or density averages shall be included if they are live inputs.
NOTE Where possible, DPIV should be calculated by the flow computer or host and stored as part of the QTR.
5.2.4 QTR for Linear Type Meters
The QTR is the average and summation of data collected and calculated during a maximum of 60 consecutive minutes (See Annex B.4, Calculation of QTR Averages). A QTR shall end, and a new record begins, at the end of each hour. This is a minimum requirement and shorter record intervals are acceptable.
The following data shall be collected in the QTRs for each period:
— date and time or date/time identifier;
— quantity (volume, mass and/or energy);
— flow time;
— Integral value;
— meter output (accumulation or average);
— static pressure average (if required by meter type);
— temperature average (if required by meter type).
Copyright American Petroleum Institute Provided by IHS under license with API
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Composition, energy content, and relative density averages shall be included as required (to perform calculations) if they are live inputs.
If the primary device does not generate a pulse count, then a manufactured pulse is not required.
For EGM systems using off-site calculations, the minimum data set generated onsite shall include:
— date and time or date/time identifier;
— flow time;
— meter output (as defined in 4.5.4).
Averages of static pressure and temperature shall be included if they are live inputs.
IV or Average Extension shall be included if these calculations are performed onsite.
5.2.5 Daily QTR for Linear Type Meters
The daily QTR is the flow time linear average or summation of QTRs calculated during a contract day. (See Annex B.4, Calculation of QTR Averages.) A daily QTR will end and a new daily record will begin at the end of each contract day.
The summation of the QTR values shall be equal to the daily report totals within the resolution of the flow computing system. If time or contract hour changes are made during a contract day, the affected totals from the EGM may not be the same; however, the final reported daily values shall match the sum of the QTR records.
The following data shall be contained in the daily QTRs for each daily period:
— date and time or date/time identifier;
— quantity (volume, mass and/or energy);
— flow time;
— Integral value (see 4.5.2);
— meter output (accumulation or average);
— static pressure average (if required by meter type);
— temperature average (if required by meter type).
Composition, energy content, and relative density averages shall be included as required (to perform calculations) if they are live inputs.