FPF Reference

    FPF.Preface:16.5.5.1 - Recover the pressure question and its inputs

    Preface node heading:fpf-preface-16-5-5-1-recover-the-pressure-question-and-its-inputs:1450

    What this page is

    This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

    Methodology

    Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

    Content

    An engineer needs a pressure assessment for a decision about pump P17: does the available information establish that its pressure, in the stated configuration and operating regime, is at or below a 300 kPa absolute limit at the measurement occasion? Other conditions and authority for releasing the installation remain separate.

    Assume three source contributions. A model manual states the absolute pressure limit. A configuration record establishes that this limit applies to P17 in the regime being considered. A measurement record reports 195 kPa above the local atmospheric pressure, with an error bound of 5 kPa; local atmospheric pressure is 100 kPa absolute with an error bound of 2 kPa. For this illustration the bounds are enclosing intervals under the stated conditions, not confidence intervals. The records are assumed applicable to the same regime and measurement occasion.

    Use C.16 to recover the measurement subject, reference and uncertainty. Here the addition relation is available, so an interval calculation can determine what comparison the supplied bounds resolve.

    Extracting two numbers called “pressure” would lose the difference between gauge and absolute reference. Retaining all three documents as a bibliography would leave the comparison unperformed. The construction needs the applicability connection, the pressure reference and the calculation consumed by the decision.

    Last Updated: 2026-10-12 — upstream FPF commit f2bc67dd (github.com/ailev/FPF)