Atlas Copco Set Seals for Oil-Injected Screw Compressors Replacement – 2906057800

Atlas Copco 2906057800 – Set Seals for Oil-Injected Screw Compressors

The Atlas Copco 2906057800 (2906-0578-00) is a Set Seals service kit designed for compatible oil-injected screw compressors.

The kit provides a selection of replacement gaskets and sealing washers used during compressor maintenance and servicing. These sealing components maintain leak-tight connections throughout the compressor’s oil, air and associated piping circuits.

During compressor operation, components are exposed to pressure, temperature changes, vibration and oil contact. Over time, existing gaskets and sealing washers can harden, deform, lose elasticity or become damaged. Replacing them during scheduled maintenance helps restore the sealing integrity of the compressor system.

Working Process:

During operation, the oil-injected screw compressor draws atmospheric air through the inlet system.

The screw compressor element compresses the incoming air while compressor oil is injected into the compression chamber.

The injected oil provides lubrication, cooling and sealing during the compression process.

The compressed air/oil mixture then moves through the separation and treatment system before compressed air is delivered to the outlet.

At the same time, compressor oil circulates through different oil lines, valves, coolers and connections.

These circuits contain numerous threaded joints, flanges and mating surfaces that require effective sealing.

The 2906057800 Set Seals provides replacement sealing components for applicable service points.

When a gasket or sealing washer is replaced, it forms a controlled barrier between the mating surfaces.

This prevents compressed air, oil or other operating media from escaping from the intended flow path.

Correct sealing therefore helps maintain system pressure, prevent oil leakage and support efficient compressor operation.

Main Functions:

• Provides replacement sealing components for oil-injected screw compressors.
• Restores sealing at serviced connections.
• Helps prevent oil leakage.
• Helps prevent compressed-air leakage.
• Maintains pressure integrity.
• Supports reliable oil circulation.
• Helps prevent contamination from entering serviced circuits.
• Supports efficient compressor operation.
• Reduces the risk of leakage-related downtime.

Official Kit Components:

Atlas Copco’s official catalog lists the kit at approximately 298 g and includes multiple sealing components, including:

• Gasket 17 × 21 × 1.5 – 3 pcs
• Gasket 17 × 21 × 1.5 – 3 pcs
• Gasket 21 × 26 × 1.5 – 3 pcs
• Flat Gasket – 3 pcs
• Flat Gasket – 3 pcs
• Flat Gasket – 3 pcs
• Seal Washer M32 – 3 pcs
• Washer Channel – 3 pcs
• Seal Washer Dowty 3/4 – 6 pcs
• Gasket 13 × 20 × 1.5 – 12 pcs
• Gasket 33 × 39 × 2 – 3 pcs
• Seal Washer – 3 pcs
• Seal Washer – 3 pcs
• Seal Washer Dowty 1/4 – 9 pcs
• Seal Washer Dowty 1/2+ – 12 pcs
• Gasket 42 × 49 × 2 – 3 pcs

The exact application of each sealing component depends on the compressor configuration and the connection being serviced.

Sealing Operating Principle:

1. Mating Surfaces: Two compressor components are joined together.
2. Seal Installation: The appropriate gasket or sealing washer is positioned between the mating surfaces.
3. Compression: Tightening the connection compresses the sealing component.
4. Surface Conformity: The seal conforms to small surface irregularities.
5. Leak Prevention: The compressed seal creates a barrier against oil or compressed-air leakage.
6. Pressure Containment: The connection maintains the required system pressure.
7. Continuous Operation: The seal remains effective during pressure and temperature cycling.

Importance of Gaskets and Sealing Washers:

Gaskets and sealing washers are consumable service components.

Repeated exposure to:

• Compressor oil
• High temperature
• Pressure
• Vibration
• Thermal cycling
• Mechanical compression
• Ageing

can cause sealing components to deteriorate.

A damaged seal can result in:

• Oil leakage.
• Compressed-air leakage.
• Pressure loss.
• Contamination.
• Reduced compressor efficiency.
• Oil accumulation around connections.
• Increased maintenance requirements.

Replacing the seal during maintenance helps restore the original sealing condition.

Role of Dowty Sealing Washers:

Dowty washers combine a metal washer with an elastomer sealing element.

When the connection is tightened, the elastomer portion forms a seal against the mating surface while the metal section provides mechanical support.

The kit contains several sizes of Dowty sealing washers, including 3/4, 1/4 and 1/2+ versions.

These are used at applicable threaded or bolted connections where a reliable pressure seal is required.

Role of Flat Gaskets:

Flat gaskets are installed between suitable flat mating surfaces.

When the connection is tightened, the gasket fills small surface imperfections and creates a barrier against leakage.

Correct gasket thickness and positioning are important for maintaining the intended sealing performance.

Role of Channel Washer:

The channel washer provides sealing/support at its designated compressor connection.

It helps maintain the required sealing condition when the associated connection is tightened.

Maintenance Procedure:

Before replacing seals, shut down the compressor according to the manufacturer’s normal shutdown procedure.

Isolate the electrical supply and applicable pneumatic/oil energy sources.

Depressurize the compressor and allow hot components to cool to a safe working temperature.

Identify the leaking or scheduled service connection.

Inspect the connection for:

• Oil leakage
• Air leakage
• Damaged gasket
• Hardened seal
• Corrosion
• Contamination
• Damaged mating surfaces
• Loose connections

Remove the old gasket or sealing washer.

Clean the mating surfaces thoroughly.

Remove oil residue, dirt and foreign material.

Select the correct replacement component from the 2906057800 Set Seals.

Install the new seal in the correct orientation.

Ensure that:

• The gasket is correctly positioned.
• The sealing washer is not damaged.
• The sealing surface is clean.
• The seal is not twisted or displaced.
• The correct component size is used.
• The connection is tightened according to the applicable Atlas Copco service procedure.

After assembly, inspect the connection for correct seating.

Restart the compressor and gradually return it to normal operating conditions.

Check for:

• Oil leakage
• Air leakage
• Abnormal pressure loss
• Abnormal temperature
• Vibration
• Overall compressor stability

Possible Failure Conditions:

Seal deterioration can occur because of:

• Excessive temperature.
• Normal ageing.
• Incorrect installation.
• Repeated assembly.
• Over-tightening.
• Under-tightening.
• Damaged mating surfaces.
• Contamination.
• Incorrect seal size.
• Chemical degradation.

Possible symptoms include:

• Oil drops around joints.
• Oil mist or residue.
• Air leakage.
• Pressure instability.
• Increased oil consumption.
• Reduced compressor efficiency.
• Abnormal noise caused by leakage.
• Increased maintenance requirements.

Service Benefits:

Using the Atlas Copco 2906057800 Set Seals during appropriate maintenance helps:

• Restore leak-tight connections.
• Reduce oil leakage.
• Reduce compressed-air leakage.
• Maintain pressure integrity.
• Support proper oil circulation.
• Protect compressor components from contamination.
• Improve maintenance reliability.
• Reduce unplanned downtime.
• Support efficient compressor operation.

Part Number: 2906057800
Alternative Number: 2906-0578-00 / 2906 0578 00
Brand: Atlas Copco
Official Description: Set Seals for Oil-Injected Screw Compressors
Component Type: Compressor sealing/service kit
Official Listed Weight: Approximately 298 g
Primary Function: Replacement of gaskets and sealing washers during compressor maintenance
Operating Function: Creates leak-tight joints in applicable oil and air circuits
Main Components: Gaskets, flat gaskets, seal washers, Dowty washers and channel washers
Main Benefits: Reduced leakage, maintained pressure integrity, reliable oil circulation and dependable compressor performance.

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