© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

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1.15.3 Gas quality 
The meter shall as a minimum requirement, operate with any of the normal range natural 
gas composition mixtures specified in AGA Report No.8, this includes relative density 
between 0.554 (pure methane) and 0.87. 
1.15.4 Pressure 
The minimum and maximum operating pressure shall be as specified by the manufacturer. 
The maximum operating pressure of the meter must be the lowest of the maximum design 
operating pressure of the meter body, flanges, transducer connections and transducer 
assemblies. 
1.15.5 Temperature 
The UM ambient and operating temperature range shall be between –40oF and 140F (-40oC 
and 60C) except specified otherwise by the manufacturer. 
1.15.6 Meter performance requirement 
General flow measurement performance requirement for all UMs shall be as follows before 
any calibration factor adjustment. 
Repeatability:              ±0.2% for qt ≤ qi ≤ qmax 
  
 
 
±0.4% for qmin ≤ qi < qt 
Resolution:  
 
0.001m/s 
Velocity sampling interval: ≤ 1 second 
SOS deviation:  
 
±2.0% 
Maximum SOS path spread: 0.5m/s 
1.15.7 Meter accuracy 
The UM shall meet the following flow measurement accuracy requirement before any 
calibration factor adjustments; 
For UMs of 12” (nominal) diameter or larger 
Maximum error: ±0.7% for qt ≤ qi ≤ qmax 
 
 
±1.4% for qmin ≤ qi < qt 
Maximum Peak to Peak Error:  
±0.7% for qt ≤qi ≤qmax  
±1 .4% for qmin ≤qi ≤qt 
For UM meters 4” to 10” nominal diameter:  
Maximum Error: ±1 .0% for qt ≤qi ≤qmax  
±1 .4% for qmin ≤qi ≤qt  
Maximum Peak to Peak Error: ±1 .0% for qt ≤qi ≤qmax  
±1 .4% for qmin ≤qi ≤qt 
For meters less than 4” nominal diameter:  
Maximum Error: ±2.0% for qt ≤qi ≤qmax  
±3 .0% for qmin ≤qi ≤qt