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- \B3.0 LIMITATIONS\b
-
- \B3.1 Physical Properties\b
-
- Natural gas properties are limited to:
-
- 0.55 <= SPGG < 2.0
-
- 1.05 <= TEMPRD < 3.0
-
- 0 <= PRSPRD < 30
-
- Liquid correlations used here should be within the following limits:
-
- 14.696 Psia < PRS < 6000 Psia
-
- 32 deg F < TEM < 250 deg F
-
- In addition the oil properties are limited by a specific oil gravity
- range of:
-
- 0.63 < SPGO < 2.0
-
- and water properties are limited by a maximum salt-content:
-
- 0 % < NaCl < 25 %
-
-
- \B3.2 Orifice Limitations\b
-
- For specifications regarding tolerances and restrictions to
- the orifices themselves, length of pipe preceding and
- following the orifice, and tapping points, you are advised
- to check the standard (Ref. 1).
-
- The beta ratio, BETA (orifice to tube diameter ratio,
- BETA = OD/PID) is limited as follows:
-
- Flange taps: 0.20 < BETA < 0.75
-
- D and D/2 taps: 0.20 < BETA < 0.75
-
- Corner taps: 0.23 < BETA < 0.8
-
- These limits do not apply for restriction orifices.
-
- The limitations on pipe diameters and orifice diameters are:
-
- Flange taps and D and D/2 taps: 50 mm < PID < 760 mm
-
- Corner taps: 50 mm < PID < 1000 mm
-
- Orifice diameters are limited for all tapping types to:
-
- OD > 12.5
-
-