Asme Ptc - 192 Fixed

The standard does not mandate a specific calendar interval but gives guidance based on usage:

However, ASME PTC 19.2 Fixed strongly recommends performing a “as-left, as-found” procedure—record readings before adjustment and after adjustment to track drift. asme ptc 192 fixed

The term "fixed" also implies that the sensor is permanently hard-piped to the tap. ASME PTC 19.2 specifies: The standard does not mandate a specific calendar

In power generation, adherence to ASME PTC 19.2 is often written into the purchase agreement for a new turbine or heat recovery steam generator (HRSG). If the fixed pressure taps do not meet the code, the supplier can reject the performance test results. However, ASME PTC 19

A fixed installation, correctly built to ASME PTC 19.2, yields repeatable measurements year after year. This is essential for trending turbine efficiency, compressor surge margin, and boiler drum level.

ASME PTC 19.2 does not set a limit. Deadweight testers exist from vacuum to 60,000 psi (400 MPa). However, at very high pressures, piston-cylinder elastic deformation must be accounted for.

A fixed installation includes block-and-bleed valves. PTC 19.2 requires that you can isolate the transmitter for calibration without disturbing the process. Many engineers forget this—they hard-pipe the transmitter directly to the tap. That is not a compliant “fixed” installation.

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