IS 15675 : 2006 Flow Measurement of Natural Gas and Fluids By Orifice Plate Meters

1 Scope

1.1 This standard specifies the geometry andmethod of use (installation and operatingconditions) of orifice plates when they are insertedin a conduit running full to determine the flow rateof the fluid flowing in the conduit. This standardalso provides background information for calculatingthe flow rate and is applicable in conjunction withthe requirements.

1.2 This standard is applicable to primary deviceshaving an orifice plate used with flange pressuretappings. Other pressure tappings such as venacontracta and pipe tappings used with orifice platesare not covered by this standard. This standard isapplicable only to a flow which remains subsonicthroughout the measuring section and where thefluid can be considered as single phase. It is notapplicable to the measurement of pulsating flow.It does not cover the use of orifice plates in pipesizes less than 50 mm or more than 1 000 mm, orfor pipe Reynolds number below 5000.

1.3 This standard is used for custody transfer ofnatural gas and fluids.

2 Reference

The following standard is indispensable for theapplication of this standard. For dated references,only the edition cited applies. For undatedreferences, the latest edition of the referencedstandard (including any amendment) applies.