# Standards for Instrument air system

**URL:** <https://forumautomation.com/t/standards-for-instrument-air-system/6668>\
**Category:** Field Instrumentation\
**Created:** [July 4, 2019, 5:16pm UTC](https://forumautomation.com/t/standards-for-instrument-air-system/6668 "2019-07-04T17:16:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [July 4, 2019, 5:16pm UTC](https://forumautomation.com/t/standards-for-instrument-air-system/6668/1 "2019-07-04T17:16:33Z")

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A commonly used industry standard to set instrument air quality standards is the [ANSI/ISA –S7.0.01-1996](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwi2y_Se4ZvjAhX46nMBHdC6DAoQFjABegQIAxAB&url=http%3A%2F%2Fwebstore.ansi.org%2FRecordDetail.aspx%3Fsku%3DANSI%252FISA%2BS7.0.01-1996&usg=AOvVaw3nkT0cv6CgKzdFFBG0ogQL). As per the described standard.

 ![instrument%20air%20system](https://cdn.forumautomation.com/original/2X/3/3ce3dd234c444dee5f73864d6f6c6bbed32c8fa9.png)

Pressure Dew Point:

[**Pressure dew point**](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=2ahUKEwipzazo4ZvjAhUUXHwKHVvqCAoQFjACegQIDRAG&url=https%3A%2F%2Fcasecontrols.com%2Funderstanding-the-importance-of-pressure-dew-point-monitoring%2F&usg=AOvVaw0mXphyWe84F-Q9w2gzC_cI) is described as the temperature at which free humidity condenses for a particular pressure from the atmosphere of the tool into liquid water.

Air dryer outlet pressure dew point should be at least 100°C (180F) below the minimum temperature at which any portion of the IA structure is subjected and at line pressure not exceeding 40°C (390F).

Particle Size:

The IA supplied to consumers is expected to contain particulate matter and a particulate size of 40 mm is acceptable for most pneumatically operated systems.

In cases where, particulate size of \< 40um is required, additional air filtration modules can be installed to achieve \< 40um sized particulate matter.

Lubricant Content:

Where the [**air compressor**](https://forumautomation.com/t/what-is-an-instrumentation-air-compressor-what-are-the-components-of-an-instrumentation-air-compressor/3848) installed in the IA scheme is lubricated with lube oil, there is always a danger of transferring oil along with the compressed air.

This presents a danger to the pneumatic systems receiving air from the tool and affecting their operation. Therefore, the content of the lubricant should be near to 0 ppm but not greater than 1 ppm w / w.

IA System Location:

The location of the Instrument Air system is also important to prevent contaminants, hazardous and flammable gases from being drawn into the Inlet air filters.