C051 – Gas Flow Rate – Pulse Output Meter
Description
This calculates the flow rate for pulse output based meters for gaseous fluids.
References
IP Petroleum Measurement Manual Part Ⅻ – Static and Dynamic Measurement of Light Hydrocarbon Liquids – Section 1: Calculation Procedures
AGA Report No.7 – Measurement of Natural Gas by Turbine Meters
Kelton calculation reference C051
KIMS calculation reference K133
Kelton calculation C244 – Calibration Correction
Kelton calculation C248 – Gas Flow Rate Conversion from Qv
Kelton calculation C261 – Gas Flow Rate Conversion from Qm
Options
Factor Type
- Meter Factor
- K-Factor
This option is used to select the whether a meter factor will be applied to the flow rate calculation. Note that K-factor will always be an input.
Meter Type
- Volume
- Mass
This option is used to select whether physics of the meter in question infers mass or volume flow rate from its direct outputs.
Ctsm
- Not applied
- User entered
- Calculated
This option is used to select whether a correction for temperature on the steel of the meter is made and whether this correction is user entered or calculated.
Cpsm
- Not applied
- User entered
- Calculated
This option is used to select whether a correction for pressure on the steel of the meter is made and whether this correction is user entered or calculated.
Interpolation Factor
- Apply
This option is used to apply an interpolation factor.
Calibration Correction
- Apply
This option is used to apply a calibration correction using C244.
Correction Method
- Before Spool Correction
- After Spool Correction
This option is used to specify whether there is a linearization applied to the flow rate. If linearization is applied to the raw volume flow rate then select before spool correction, if it is done after correction factors have been applied select after spool correction.
Spool Temperature Coefficient
- Cubic
- Linear (Approximate)
- Linear (Full)
This option is used to select the temperature coefficient applied for the Ctsm calculation is linear or cubic.
Calculate for
- Mass
- Observed volume
- Standard volume
- Normal volume
- Energy
Calculation
Correction for temperature on steel of meter
The Ctsm is calculated by:
| Where | ||
|---|---|---|
| αsp | = | Meter temperature coefficient |
| Tsp | = | Meter temperature |
| Trf | = | Meter reference temperature |
Correction for pressure on steel of meter
The Cpsm is calculated by:
| Where | ||
| λsp | = | Meter pressure coefficient |
| Psp | = | Meter pressure |
| Prf | = | Meter reference pressure |
Uncorrected volume flow rate
The uncorrected volume flow rate is calculated by:
| Where | ||
|---|---|---|
| f | = | Frequency |
| Kf | = | K-factor (Will be pulses per volume or pulses per mass depending on whether output flow rate is volumetric or mass based) |
Corrected Flow Rate
The flow rate, observed volume or mass, is calculated by :
| Where | ||
| IntF | = | Interpolation factor |
| MF | = | Meter factor |
| f | = | Frequency |
| Kf | = | K-factor |
| Ctsm | = | Correction for temperature on steel of meter |
| Cpsm | = | Correction for pressure on steel of meter |
| Ccal | = | Calibration correction |
Note that correction factors are set equal to one if they are not required for the calculation of flow rate.
Other flow rate types are calculated using one of the flow rate converters.