1 Scope
This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions)
of cone meters when they are inserted in a conduit running full to determine the flow
rate of the fluid flowing in the conduit.
As the uncertainty of an uncalibrated cone meter might be too high for a particular
application, it might be deemed essential to calibrate the flow meter in accordance
with Clause 7.
This part of ISO 5167 also provides background information for calculating the flow rate and is applicable
in conjunction with the requirements given in ISO 5167‑1.
This part of ISO 5167 is applicable only to cone meters in which the flow remains subsonic throughout the
measuring section and where the fluid can be considered as single-phase. Uncalibrated
cone meters can only be used within specified limits of pipe size, roughness, β , and Reynolds number. This part of ISO 5167 is not applicable to the measurement of pulsating flow. It does not cover the use
of uncalibrated cone meters in pipes sized less than 50 mm or more than 500 mm, or
where the pipe Reynolds numbers are below 8 × 10 4 or greater than 1,2 × 10 7 .
A cone meter is a primary device which consists of a cone-shaped restriction held
concentrically in the centre of the pipe with the nose of the cone upstream. The design
of cone meter defined in this part of ISO 5167 has one or more upstream pressure tappings in the wall, and a downstream pressure
tapping positioned in the back face of the cone with the connection to a differential
pressure transmitter being a hole through the cone to the support bar, and then up
throu...
Open preview (PDF)Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Cone meters