scope:

Scope and purpose

This publication applies to single shaft horizontally split casing and vertically split casing (barrel) type compressors and integrally geared compressors. Operating experience exists in compressors up to 71 000 Nm³/hr (2 700 000 scfh) at pressures up to 1230 psi (8.5 MPa) for single shaft compressors and up to 650 psi (4.5 MPa) for integrally geared compressors with oxygen purity of 90% or greater and with maximum 10 ppm water (volume basis).^{1, 2}

The use of axial compressors in oxygen service is not covered by this publication.

The purpose of this publication is to provide guidance on the design, manufacture, installation, operation, and maintenance of centrifugal oxygen compressors, thereby safeguarding personnel and equipment. Fire in an oxygen compressor can be caused by a variety of reasons, which include mechanical deterioration resulting in excessive vibration and/or loss of running clearances within the compressor, ingress of oil (for example, through the seal system), foreign bodies passing through the machine, and surge.

An oxygen compressor shall be provided with a safety support system that shall minimize the development of a potentially dangerous operating condition. In the event of an incident on the compressor that results in combustion of the materials of construction, the safety systems shall be designed to minimize the effect of the fire.

The safe and reliable compression of oxygen using centrifugal compressors can only be achieved by the successful combination of many factors. This publication identifies and addresses the following factors.

¹ psi, bar, and kPa/MPa shall indicate gauge pressure unless otherwise noted as (psia; bar, abs; and kPa/MPa, abs) for absolute pressure or (psid; bar, dif; and kPa/MPa dif) for differential pressure. All kPa values are rounded off per CGA P-11, Guideline for Metric Practice in the Compressed Gas Industry [1].

² References are shown by bracketed numbers and are listed in order of appearance in the reference section.