Facility Utility Air System Quality.

Are you validating your facility air system to ISO8573.1?

This Facility Utility air ISO is an international standard that specifies the quality of facility utility air system. The standard defines limits for three categories of air quality:

  • Maximum particle size for any remaining particles
  • Maximum allowable dewpoint temperature
  • Maximum remaining oil content

Each category is given a quality class number between 1 and 6 according to the reference values shown in the table below. As an example, a system that conforms to ISO8573.1 and is rated for class 1.1.1 will provide air with a dewpoint no higher than -94 °F (–70 °C). All remaining particles in the air will be 0.1 um or smaller, and the maximum oil content will be 0.01 mg/m3. There are other standards for high pressure air quality, such as ANSI/ISA-7.0.01-1996 for instrument air.

ANSI/ISA-7.0.01-1996 for instrument air.

Graphis for facilty utility air systems in use.

ISO 8573-1 (2001) Changes:

ISO 8573-1 (2001) Changes:

The standard now speaks about total oil content (aerosol, liquid and vapour).

A standard was introduced on measurement of oil vapour ISO 8573 part 5.

A new class (Class 0) was introduced to cover more stringent quality requirements.

The clause which recommended ways to remove oil was deleted.

Representative samples were asked.

Measuring the dewpoint.

Some principles of dewpoint measurement apply to all types of instruments, regardless of manufacturer.  However the single most important thing is to:

• Select an instrument with the correct measuring range:

A low pressure instrument connected to a high pressure system may explode and cause serious injury to anyone in the vicinity.  Some instruments are suitable for measuring high dewpoints, but not low dewpoints. Similarly, some instruments are suitable for very low dewpoints but are compromised when exposed to high dewpoints.

• Understand the pressure characteristics of the dewpoint instrument:

Some instruments are not suitable for use at process pressure. They can be installed to measure high pressure air after it is expanded to atmospheric pressure, but the measured dewpoint value will have to be corrected if pressure dewpoint is the desired measurement parameter.


Piping in Facility Utility Compressed Air Systems.

  1. The piping and compressed air treatment equipment should have characteristics rated at 2,000 scfm at pressures as low as 85 psig; not to exceed 20 fps pipeline velocities.
  2. Interconnecting piping from the compressor discharge to the filter/dryer and from the filter/dryer should be design to have negligible pressure loss.
  3. The coalescing pre-filter should be sized to handle a flow rate of 2,000 scfm/minimum and still be effective at flows as low as 100 scfm or less. The filter should have a full load pressure loss of 1 psid or less when new and wet. Filter change is due at 3 psid or less. Filter life must exceed 1 year with no particulate filter installed ahead.
  4. The dryer should be rated for 2,000 scfm flow rate at 100/100/100. It should be a full cycling “heat sink” or “thermal mass” type refrigerated compressed air dryer capable of running with the refrigeration system only in direct response to actual heat load.
  5. Dryer refrigeration compressor starts should be limited to 6 starts per hour based on the size and type of heat sink. The refrigeration compressor will shut off, not just unload.


Click here to view

Search Our Store

To find a specific document enter full details in Search Box Below. The more defined the search is the more precise the search findings will be.

Select Preferred Language

When assistance is required; please contact us TOLLFREE at 1-877-462-4048...If out of office hours; please leave a voice message.

SOP Equipment Validation.

The SOP for Computer Equipment Validation continues to be an extremely popular document. This document leads you through the validation process, from the URS to the final P2Q.

Purchase your copy now at Special Price of $22.00.


Validation Risk Assessment (Issue11.) -- $125.00

The Risk and Part 11 Validation Risk Assessment (VRA) protocol is becoming the most important document in the validation train. The VRA reassures the regulators that you have looked at specific equipment functionality and considered the appropriate level of validation that is required. You have also considered various aspects of its use and the implications of any malfunctions. From the results of this exercise the scope of all validation activity can and must be justified. This is a robust and simple to execute document, one that will lead you through the process and deliver a result that can be used as the foundation for your validation activities.
This VRA now includes the assessment table for categorizing and documenting the new
21 CFR Part 11 guidance ruling on what predicate data must be stored in a Part compliant system, along with the new broadsheet to establish your new database of part 11 records. (now mandatory).


Equipment combined IQ/OQ/PQ Protocol.

This combination protocol has been produced in response to several hundred reader suggestions we received in our ‘Suggestions Section’. It has been carefully designed to make it the preferred choice for Process and Laboratory stand alone equipment. It is interactive, easy to use and suitable for all mixes of equipment with and without software.
The IQ section establishes documented verification that key aspects of the equipment adhere to approved design intentions and that the recommendations of the manufacturer have been suitably considered. The OQ section establishes that there is documented verification that the installed system functions as specified and that there is sufficient documentary evidence to demonstrate this. The PQ section gives documented verification that the equipment performance in its normal operating environment is consistently exactly as specified in the URS.