Scope · terminology
Defines the method of measuring flow with differential-pressure primary devices (orifice plates, nozzles, venturi tubes) when fluid flows full in a conduit of circular cross-section, together with the related terms and symbols.
Geometry of primary devices and tap positions
Specifies the geometry, dimensional tolerances, pressure tapping positions and finish conditions of concentric orifice plates (flange taps · corner taps · D-D/2 taps), nozzles and venturi tubes.
Installation requirements
Covers the minimum straight lengths upstream and downstream of the primary device, the conditions for piping elements (elbows, valves, reducers), and the conditions for using flow straighteners (Flow Conditioner).
Flow calculation · uncertainty
Presents the flow equation in terms of the discharge coefficient (C), expansion factor (ε) and diameter ratio β, and the method of estimating measurement uncertainty. Our flow calculation sheets are prepared according to this procedure.
The full text of the standard is available from the Korean Standards information network (KS). For inquiries about the application of individual clauses and calculation conditions, please contact Sales (031-357-8431, ext. 1) or use our online inquiry.