The term "fixed" also implies that the sensor is permanently hard-piped to the tap. ASME PTC 19.2 specifies:
Yes. The standard is technology-agnostic. You can calibrate a smart transmitter using a deadweight tester as the fixed pressure source, then read the digital output. asme ptc 192 fixed
How does this standard compare to others? The term "fixed" also implies that the sensor
| Standard | Focus | Fixed Tap Allowed? | | :--- | :--- | :--- | | ASME PTC 19.2 | General pressure measurement for performance tests | Yes (primary focus) | | ASME PTC 6 | Steam turbine testing (refers back to PTC 19.2) | Yes, with additional requirements | | ISO 5167 | Differential pressure flow meters (orifice plates) | No (requires corner taps or flange taps) | | API 551 | Process measurement (not performance testing) | Yes, but less stringent | You can calibrate a smart transmitter using a
For power generation performance testing, ASME PTC 19.2 remains the controlling document. The "fixed" installation is acceptable but auditors will expect to see the uncertainty budget.