# Upstream and downstream straight length run is essential for an orifice plate flow measurement

**URL:** <https://forumautomation.com/t/upstream-and-downstream-straight-length-run-is-essential-for-an-orifice-plate-flow-measurement/71>\
**Category:** Flow Measurement\
**Created:** [October 2, 2014, 6:02pm UTC](https://forumautomation.com/t/upstream-and-downstream-straight-length-run-is-essential-for-an-orifice-plate-flow-measurement/71 "2014-10-02T18:02:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![instrumen](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/65b543/32.png) [@instrumen](https://forumautomation.com/u/instrumen)\
**Post date:** [October 2, 2014, 6:02pm UTC](https://forumautomation.com/t/upstream-and-downstream-straight-length-run-is-essential-for-an-orifice-plate-flow-measurement/71/1 "2014-10-02T18:02:51Z")

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The upstream can be identified by the orifice plate’s Tag number markings. Tag numbers are always marked on the upstream of the orifice plate. An upstream of 28D and a down steam of minimum 7D is essential for an a