to estimate the limits of these errors based on calibration data or professional judgment. Standard vs. Expanded Uncertainty:
In the field of engineering, performance testing, and industrial measurement, accuracy is not just a preference—it is a necessity. Whether testing the efficiency of a steam turbine, the heat rate of a boiler, or the output of a power plant, determining the reliability of measurement data is critical.
Allows for fast navigation to complex topics like propagation of error or confidence intervals. Core Components of ASME PTC 19.1-2018
Understanding ASME PTC 19.1: The Definitive Guide to Test Uncertainty (PDF) asme ptc 191 pdf
In short: It separates "data" from "good data."
ASME. (2018). Test Uncertainty: Performance Test Codes (ASME PTC 19.1-2018). The American Society of Mechanical Engineers, New York.
that provides standardized procedures for evaluating and propagating uncertainties in test measurements. The primary goal is to provide a numerical estimate to estimate the limits of these errors based
The document you are looking for is ASME PTC 19.1 "Test Uncertainty"
$$U = \pm \sqrtB^2 + (t \times S)^2$$
ASME PTC 19.1 is a core supplement to the ASME Performance Test Codes (PTC) family . While primary codes focus on specific hardware—such as steam generators (PTC 4) or gas turbines—PTC 19.1 acts as the overarching "mother standard" that defines how to calculate the quality and validity of data across all of them. Whether testing the efficiency of a steam turbine,
: In multi-million dollar power plant contracts, the "test tolerance" is often defined by the PTC 19.1 uncertainty calculation. If you can't prove your uncertainty, you can't prove you met the guarantee. The "Mother Standard" : Most other Performance Test Codes (like
Uncertainty analysis is not just a theoretical exercise; it is a fundamental requirement for almost all ASME Performance Test Codes. For instance, the codes for , compressors (PTC 10) , and fans (PTC 11) all mandate that engineers conduct both pre-test and post-test uncertainty analyses as a core part of the test.
Disclaimer: This article is for informational purposes. Always refer to the official ASME PTC 19.1 PDF for binding calculations and legal compliance.