ISO 5167-2 :2003
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates.
ISO 5167, consisting of four parts, covers the geometry and method of use (installation and operating conditions) of orifice plates, nozzles and Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. It also gives necessary information for calculating the flowrate and its associated uncertainty.
ISO 5167 consists of the following four parts.
a) ISO 5167-1 gives general terms and definitions, symbols, principles and requirements as well as methods
of measurement and uncertainty that are to be used in conjunction with ISO 5167-2, ISO 5167-3 and ISO 5167-4.
b) ISO 5167-2 specifies orifice plates, which can be used with corner pressure tappings, D and D/2 pressure
tappings2), and flange pressure tappings.
c) ISO 5167-3 specifies ISA 1932 nozzles3), long radius nozzles and Venturi nozzles, which differ in shape
and in the position of the pressure tappings.
d) ISO 5167-4 specifies classical Venturi tubes4).
API MPMS 14.3.1 - Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids-Concentric, Square-edged Orifice Meters Part 1: General Equations and Uncertainty Guidelines
API MPMS 14.3.3
Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids-Concentric, Square-edged Orifice Meters Part 3: Natural Gas Applications
ASME MFC-8M
Fluid Flow in Closed Conduits: Connections for Pressure Signal Transmissions Between Primary and Secondary Devices
PIP PCFFL000
Orifice Plate Fabrication Details