ASME PTC-19-1 pdf free download

ASME PTC-19-1-2013 pdf free download.Test Uncertainty Performance Test Codes.
Most Sections in this revision of ASME FTC 19.1-2005 II] are rewritten to both add to the available technology for uncertainty analysis and to make it easier for the practicing engineer. Throughout, the intent is to provide a Code that can be utilized easily by engineers and scientists whose interests are the objective assessment of measured-parameter data qualit using test uncertainty analysis.
1-2 UNCERTAINTY CLASSIFICATIONS
This Code utilizes two major classifications for errors and uncertainties. They are “systematic” and “random,” Random errors, whose effects are estimated with “Random Standard Uncertainties,” cause scatter in test data. Systematic errors, whose effects are estimated with “Systematic Standard Uncertainties,” do not. Random and systematic terms illustrate the effects of error sources.
While this Code uses the uncertainty-propagation methodology consistent with the International Organization for Standardization (ISO), Guide to the Expression of Uncertainty in Measurement (GUM) 121. this Code emphasizes the effects of errors rather than the basis of the information utilized in the estimation of their limits. The ISO GUM utilizes a different classifications for uncertainties, “Type A” and “Type B.” Type A uncertainties are evaluated with statistical methods while Type B uncertainties are evaluated using other means, such as models or judgment. Types A and B terms identify the pedigree of the error sources.
The uncertainty of a test result is independent of whether the elemental uncertainties are classified as systematic or random, or as Type A or Type B. Regardless of the uncertainty classification used, the calculated uncertainty of the result will be the same. While this Code utilizes systematic and random terms, there may be situations where it is useful to classify elemental uncertainties by effect, source, or both. This dual classification is illustrated in the examples presented in this Code.
1-3 ADVANTAGES OF USING THIS CODE
This Code includes procedures and techniques that are needed for proper uncertainty analysis. These include
(a) proper handling of both systematic and random uncertainty sources
(b) allowance for identification of the pedigree of each uncertainty source
(C) simplified method for estimating the uncertainties from nonsymmetrical error sources
(d) estimating uncertainties resulting from partially or fully correlated errors
(e) computing uncertainties for test measurements including the uncertainties of calibration processes
(fi enhancement of understanding through the inclusion of illustrative simple examples, within the body of the Code
(g) presentation of additional topics of interest for estimating test uncertainty including
(1) sensitivity evaluation
(2) fossilization of calibration uncertainties
(3) handling spatial variation
(4) analyzing redundant means
(5) detailed analysis of regression uncertainty
In addition, Section 10 and several Appendices of this Code include advanced, more comprehensive examples of uncertainty applications.
The inclusion of the above is intended to improve the understanding of engineers engaged in the estimation of their test data quality and of their test measurement uncertainty in a practical setting.
1-4 APPLICATiONS
This Code is intended to serve as a reference to other ASME Instruments and Apparatus Supplements (l’lC 19 Series) and to ASM F l’erformance Test Codes and Standards in general. In addition, it i. applicable for all known measurement and test-uncertainty analyses.ASME PTC-19-1 pdf download.