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AXI® Type L Compressors

Features and Benefits

Unique Housing Construction:

• Removable end-covers permit easy access to timing gears, seals and bearings.

Quiet Helical Timing Gears:

• Synchronized rotors with close clearances enhance long life.
• Timing gears transmit only a tenth of the driver power, resulting in negligible wear.

Lubricant-free Compression:

• No oil contamination of air or gas being compressed.

Positive Displacement Compressor:

• Operates over a wide range of pressures and speeds.
• Handles a multitude of gases from air to light hydrocarbons, ammonia, freon, hydrogen and nitrogen.
• Permits operation at moderate speeds, suitable for direct-connected motor drive.

Less Area Required for Capacity Range:

• May cut floor space costs substantially.

No Unbalanced Forces:

• Eliminates need for expensive foundation, lowering installation costs.

Rotors Do Not Touch Each Other or the Casing:

• Actual compressing parts not subject to mechanical wear.
• Power requirements are less than other types of oil-free compressors in its pressure range.

Seals

Standard Labyrinth Seal: This seal is used primarily for dry air, nitrogen and dry vacuum services, but may be used for any dry gas which is non-hazardous and where a small leakage can be tolerated. The seal bushing is stationary and has machined grooves and ridges ("teeth"). Sealing is achieved by the repeated throttling and expansion of air or gas across the teeth.

Labyrinth Seal with Water Slinger: When liquid is entrained or injected into the air or gas being compressed, it must be kept out of the bearing areas and lube oil. This seal incorporates a rotating grooved stainless-steel sleeve with a babbitt-lined stationary bushing, plus a water slinger which prevents moisture from leaking along the shaft. This is the standard seal for wet vacuum service.

Purged Labyrinth Seal: When a leak of the gas being compressed cannot be tolerated, labyrinth seals may be used to inject air or another purge gas at a pressure slightly higher than compressor discharge. In addition, by injecting an inert purge gas, these seals may be used to prevent air in-leakage from mixing with the gas being compressed.

Mechanical Seals: Where the gas compressed is hazardous or expensive and where purging may not be practical, face-type mechanical seals can be supplied. These employ rotating seal rings which make vertical contact against stationary surfaces. A separate oil system is used to pressurize and cool the seals.

Lubrication Systems

Optional packaged lubricating systems supply cooled, filtered oil under pressure to the compressor bearings and timing gears for a wider range of operation. These systems may be packaged with the compressor or on separate off-unit consoles. Seal oil at the required pressure may be supplied from the lube oil system, or from a separate specialized system. All equipment will be provided in compliance with the customer specifications and appropriate industry standards.

Compressor Package

Dresser-Rand can custom manufacture a compressor package to meet almost every application. Our AXI units are adaptable to all types of drivers and coupling arrangements for electric motors, steam turbines, gas turbines, or diesel or gas engines. Control panels can be equipped with any degree of electronic instrumentation. In addition, sound-attenuating silencers and enclosures or blanketing are offered to help meet federal and customer noise reduction requirements.

Our Type L AXI packaged units are piped, wired and fitted out prior to shipment for remote, difficult applications where unattended operation is required (i.e., in desert or ocean platform sites). They are ideal for direct drive by standard 2-pole/3550 rpm and 4-pole/1770 rpm motors, resulting in significant cost advantages over the slower-speed, larger-frame motors required by other types. Most units are direct-driven through a flexible coupling, but V-belt or gear drive can also be used if conditions warrant. A separately-mounted control panel provides for remote automatic start and stop, first-out alarm annunciation with local override for testing, and complete checkout and transfer operations.

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