Overview
ISO 10440-2:2001 defines minimum requirements for packaged, oil-free rotary positive-displacement compressors used in the petroleum and natural gas industries. It applies specifically to helical, spiral and straight-lobe, oil-free rotary compressors for air (and other inert gases) in continuous duty process units - typically in refinery services - for service pressures up to 0.20 MPa. This part is limited to oil-free machines and explicitly excludes oil‑injected rotary compressors. Annex A contains normative data sheets recommended for purchase specifications.
Key topics and technical requirements
The standard covers practical design, testing and documentation elements that purchasers and manufacturers need to agree on, including:
- Basic design: casing types (axially/radially split), pressure casing limits, external forces/moments, rotating elements and rotor assemblies.
- Seals and sealing pressures: maximum sealing pressure expectations and seal system considerations.
- Dynamics, bearings and lubrication: bearing housings, allowable speeds (rated, maximum, minimum), vibration and balance requirements.
- Accessories and integration: drivers, couplings, guards, mounting plates, controls, instrumentation, piping and appurtenances for packaged units.
- Inspection and testing: acceptance tests, inspection protocols, testing and preparation for shipment.
- Vendor documentation: required proposals, contract data, and the use of data sheets to capture purchaser decisions (bulleted clauses indicate purchaser input is required).
- Materials and nameplates: materials of construction and required identification marking.
- Normative references are provided for related technical elements (for example ISO 1217 for acceptance tests, API standards for lubrication and monitoring, and various ISO/IEC/ASME documents).
Applications
ISO 10440-2 is intended to be used when procuring or manufacturing packaged air compressors (oil-free) for:
- Refinery process units and general petroleum or gas processing service
- Continuous-duty air/inert gas compression up to 0.20 MPa
- Turnkey packaged skid-mounted compressor units that include drivers, controls, and piping
Who should use this standard
- Procurement engineers and project teams writing compressor purchase specifications
- Compressor manufacturers and vendors preparing proposals for packaged oil-free rotary compressors
- Plant engineers, rotating-equipment specialists, and maintenance planners in petroleum and natural gas facilities
- Contractors and EPC firms specifying packaged compressor packages for process units
Related standards
Key referenced documents and related guidance include ISO 10440-1 (process compressors), API 619 (basis for this part), ISO 1217 (acceptance tests), and industry standards for bearings, piping and monitoring (examples: API 614, API 670, ASME B31.x). Use these jointly to ensure complete technical coverage when specifying packaged oil-free rotary compressors.