For RealFLO liquid flow run calculations, API Chapter 11.1 (section 11.1.2.3) and API Chapter 11.2.4 (section 2) specify limits for the inputs; specifically:
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Base density Ranges
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Flowing density Input Ranges
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Temperature Input Ranges
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Gage Pressure Input Ranges
To ensure the inputs are in the proper ranges, refer to the following 4 tables which denote the proper ranges for each product type:
Base Density Ranges
Flowing Density Input Ranges
Temperature Input Ranges
Gage Pressure Input Ranges
The tables above may also be found in the RealFLO Documentation Set in the following location:
Realflo Documentation Set | Expert Mode | Appendix C: Liquid Flow Calculation Ranges