# Function of an orifice plate in flow measurement

**URL:** <https://forumautomation.com/t/function-of-an-orifice-plate-in-flow-measurement/70>\
**Category:** Flow Measurement\
**Created:** [October 2, 2014, 6:00pm UTC](https://forumautomation.com/t/function-of-an-orifice-plate-in-flow-measurement/70 "2014-10-02T18:00:29Z")\
**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, 6:00pm UTC](https://forumautomation.com/t/function-of-an-orifice-plate-in-flow-measurement/70/1 "2014-10-02T18:00:29Z")

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An orifice plate creates a differential pressure in a flow line. The DP created is use for measuring the flow through the process line

‘d’ (orifice diameter) id permitted in a pipeline

```
			0.25 D<d<0.75 D

```

‘d’ – the Orifice diameter should be in-between 0.25 and 0.75 of the pipeline ‘D’ diameter.

The orifice plate used in a gas line will be having a small drain whole at the bottom of the orifice plate.