BS ISO 8625-1:2018 pdf download – Aerospace — Fluid systems — Vocabulary Part 1: General terms and definitions related to pressure This document defines general terms relating to pressure in fluid systems used in aerospace construction. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp NOTE A graphical representation of an arbitrary pressure curve is shown in Annex A. 3.1 absolute pressure pressure using absolute vacuum as a reference, equal to gauge pressure plus atmospheric pressure 3.2 actual pressure pressure at a specific location, temperature and time within a system or component 3.3 ambient pressure pressure on an object caused by its surrounding medium 3.4 atmospheric pressure absolute pressure of the atmosphere at a specific location and time 3.5 back pressure pressure acting against the specified direction of operation 3.6 breakout pressure minimum pressure required to overcome static friction in a component under defined conditions 3.7 burst pressure, actual pressure at which a component bursts or shows excessive leakage due to structural failure 3.8 burst pressure, minimum ultimate pressure, minimum pressure up to which no burst or rupture of components is allowed 3.9 certification pressure authorized pressure for official acceptance tests by authorities 3.10 charge pressure inflation pressure pressure to which a component is charged or inflated 3.11 control pressure pilot pressure pressure required to control or move a component, respectively to move the component to a predefined position 3.12 cut-out pressure pressure at which a cut‑out sequence of a component or system begins 3.13 differential pressure difference in value between two pressures occurring simultaneously at different points 3.14 dynamic pressure kinetic energy per unit volume of a fluid particle, the dynamic pressure is the total pressure minus thestatic pressure 3.15 flushing pressure pressure required to flush a system under defined conditions EXAMPLE At defined flow. 3.16 gauge pressure measured absolute pressure minus atmospheric pressure 3.17 idling pressure pressure required to maintain a system or component, or flow and/or load, at idle speed Note 1 to entry: Also the resulting pressure when a system or component (e.g. a pump) is operated at idle speed. 3.18 internal pressure pressure exerted inside a system or component...
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