Asme Ptc 19.11 Pdf May 2026

ASME PTC 19.11 (Performance Test Code 19.11) is a standards document published by the American Society of Mechanical Engineers that provides recommended procedures, methods, and reporting requirements for the uncertainty evaluation of measured values in performance tests. It guides practitioners on estimating, combining, and reporting measurement uncertainty so test results are defensible, traceable, and comparable.

ASME PTC 19.11, titled "Test Uncertainty," is a performance test code (PTC) published by the American Society of Mechanical Engineers that provides methods and guidance for determining, calculating, and reporting uncertainty in measurements used during performance testing of energy systems and equipment. It establishes consistent practices for estimating measurement uncertainty so that test results are defensible, repeatable, and comparable.

The probe must be inserted into the pipe or drum such that it draws from the center of the flow (typically 1/3 of the pipe diameter from the wall). Materials are specified to avoid contamination (stainless steel 316L is common). Asme Ptc 19.11 Pdf

The standard cross-references other ASME and ASTM methods but codifies the acceptance criteria for:

The ASME PTC 19.11 PDF is evolving. The latest versions are beginning to include: ASME PTC 19

ASME is also piloting a "Living Standard" model, where the PDF receives annual addenda for new instrumentation (e.g., laser-based steam moisture analyzers). This makes maintaining a current PDF more critical than ever.

While the full title mentions water sampling, the industry often references PTC 19.11 in the context of the Throttling Calorimeter method. Before the widespread adoption of this standard, measuring the quality of wet steam was inconsistent across facilities. ASME PTC 19.11 codified a scientific, repeatable method that allows engineers to calculate steam quality by measuring the temperature drop across a throttling orifice. ASME is also piloting a "Living Standard" model,

ASME PTC 19.1 covers Measurement Uncertainty for all instruments. PTC 19.11 refers to 19.1 for uncertainty analysis but is specifically for steam/water sampling. Do not substitute one for the other.