Atlas Copco 1616626081=1616626090 O.I.S. H-05 Service Stage Air End

Description

The 1616626081 is the O.I.S. H-05 service stage, the oil-injected screw air end that Atlas Copco supplies for this class of rotary screw compressor. It is the compression element of the machine, the part that turns drive power into compressed air, and everything downstream works with what it produces. The stage is recorded under two numbers, 1616626081 and 1616626090, and both references lead to the same element. Packed, it measures 60 × 50 × 40 cm and weighs 55 kg, with Belgium recorded as the country of origin.

What the 1616626081 Service Stage Is

A service stage is the compression element supplied through the service channel for a compressor that is already in the field. It replaces the element fitted on the production line, and it is built as a complete factory assembly rather than as a set of loose parts. Fitting one returns the machine to the air delivery and the working pressure it was built for.

The 1616626081 is listed in the item data as SERVICE STAGE O.I.S. H-05 and classified under rate group S3K, Oil injected screw, Element. That group places the part in the compressor parts classification as a compression element, which is the class an order travels under. The same record carries the second number 1616626090, and it names Belgium as the country of origin with the customs tariff code 8414900090.

The O.I.S. H-05 Designation

O.I.S. stands for oil-injected screw, the compression principle this stage uses. The H-05 code is the stage designation Atlas Copco records for this element, and it is the reference that separates the stage from the other stages in the same family. The designation is carried on the stage and quoted in the parts records exactly as it appears here.

The second number on the record, 1616626090, is the reference that the current version of the stage carries. Both numbers describe the one O.I.S. H-05 element, and the parts records keep them side by side because a machine file can quote either one. An enquiry that quotes 1616626090 reaches the same stage as an enquiry that quotes 1616626081.

Service Stage or Workshop Rebuild

A stage that has reached the end of its working life can be handled in two ways. A workshop rebuild keeps the original rotors and housing and renews the bearings, the seals and the gaskets, and it suits a unit whose rotor surfaces and bore are still clean. The alternative is a complete service stage such as the 1616626081, which arrives as a factory-assembled element and returns the machine to its original specification in one step.

The choice follows a teardown inspection. The readings that decide it are the rotor surface condition, the bore condition and the measured clearances. Where the rotors are scored or the housing bore is worn, a replacement stage is the shorter route back to service.

Where the Stage Sits in the Machine

The stage is the air end of the compressor package, and it sits at the drive end, where the motor or the drive coupling turns the rotor shaft. Air arrives at the inlet port after the inlet filter, and the air-oil mixture leaves at the discharge port for the separator vessel. Everything between those two ports is the work of the 1616626081.

Because the element is oil-injected, it works inside the oil circuit of the host machine rather than on its own. The oil that seals and cools the compression chamber is the same oil that reaches its bearings, so oil condition, oil filtration and separator performance all belong to the working life of the stage. A machine that runs on clean, correctly specified lubricant keeps the 1616626081 in the condition the factory intended.

The 1616626081 also carries the drive interface. Its shaft takes the load from the motor through a coupling or a belt layout, and its mounting faces locate it on the machine frame. Those interfaces are what a replacement has to match, and they are the reason the fitment is confirmed against the machine rather than against the family name alone.

How the 1616626081 Compresses Air

Two helical rotors turn in opposite directions inside a precision-bored housing. The pair is a male rotor and a female rotor, and their profiles set the volume of air the stage traps and compresses on each turn. Injected oil seals the running clearances, so the rotors never run in metal-to-metal contact.

Air enters through the inlet port and fills the grooves between the rotors. As the rotors turn, the meshing point travels along their length, closes the groove and shortens the pocket, and the pressure inside the pocket rises until it reaches the discharge port. The cycle repeats continuously, which is what gives the 1616626081 a steady delivery with little pulsation.

The oil does three jobs at once. It seals the clearances so compressed air does not leak back towards the inlet, it carries away the heat of compression, and it keeps a lubricating film on the bearings and the rotor mesh. That is why the stage holds its efficiency over long runs, and why its wear concentrates in the bearings rather than on the rotor flanks.

Air and oil leave the 1616626081 together and pass to the separator, where the bulk of the oil is taken out and returned to the sump. The oil is then cooled and filtered before it goes back to the injection point, and the air continues to the aftercooler and the outlet of the machine.

What Drives the Stage to Renewal

The 1616626081 ages gradually, and the change shows in readings a plant can already take. Free air delivery falls at the same rated pressure, discharge temperature rises under the same load and ambient condition, and the power drawn for each unit of air delivered rises with it. Vibration and noise at the bearing housings grow at a steady load.

A single reading taken on the 1616626081 says little on its own. Recorded at a fixed interval the readings form a trend, and the trend is what turns an unscheduled stop into planned work. Oil analysis adds a second line of evidence, because wear debris from the bearings appears in the oil sample before the vibration reading moves.

Renewal timing for oil-injected elements is normally discussed in the 20,000 to 40,000 running-hour range as a family-level reference, and the real figure follows the condition of the machine and its service documentation rather than a fixed count. Vibration checks, oil samples and temperature trends predict bearing condition long before such a count is reached. A planned renewal with the 1616626081 keeps the stop on the schedule, because bearing fatigue left alone can let the rotors seize, and that writes the element off rather than allowing a repair.

Handling and Fitting the 1616626081

At 55 kg and 60 × 50 × 40 cm as packed, the 1616626081 is a lifting job with a clear route from the store to the machine, and the figures belong on the plan for the fitting day. The stage is moved on its mounting faces rather than rolled onto its shaft, and the protective caps stay on the ports until the moment of fitment.

Grit or moisture that reaches the rotor surfaces or the housing bore scores them on the first start, and that damage cannot be undone. The machine side of the job matters just as much. Clean the mounting faces, check the coupling for wear, and confirm the alignment and the rotation direction before the first turn.

New seals and gaskets belong with a new stage rather than the old ones. Once the 1616626081 is in place, the oil circuit is filled with the specified lubricant and the separator is checked at the same visit. The machine is then run unloaded under observation while the discharge temperature, the oil pressure and the vibration at the bearing housings are watched, and the coupling and mounting fasteners are re-torqued after the first running hours.

Ordering the 1616626081 Through Seadweer

Two pieces of information lock the order down: the number on the stage being replaced, which reads 1616626081 or 1616626090, and the model and serial number on the compressor nameplate. The nameplate matters because stage, frame and port arrangement can differ across the builds that use this element family.

Send both to Seadweer and the parts desk confirms the fitment in one pass, without a second round of questions. Where the number on the old stage has worn away, the nameplate alone is enough, because the parts list for that serial number names the stage the machine was built with.

Plants that run more than one compressor keep a short record for each machine: model, serial number and stage number. That record turns the next enquiry into a single message with a confirmed answer, and it is the same record the parts desk works from when the 1616626081 is quoted.

Technical Specifications

The tables below collect the identification data and the physical figures recorded for the 1616626081.

Part Identification

Dimensions and Weight

The 55.00 kg weight and the 60 × 50 × 40 cm box describe the stage as packed, and they set the handling and transport plan for the 1616626081. Seadweer confirms the current package details with the quotation.

FAQ

What is the difference between 1616626081 and 1616626090?

They are two references recorded for the same O.I.S. H-05 service stage. The 1616626090 is the number the current version of the stage carries, while 1616626081 is the number an existing machine file quotes most often.

Which compressors use the 1616626081 stage?

The 1616626081 belongs to the oil-injected rotary screw family, which covers stationary plant compressors and portable diesel-driven units such as the XAS range. Stage size and port arrangement differ across those builds, so the parts list for your machine serial number is the record that confirms the match.

How heavy is the 1616626081?

The item data lists 55.00 kg and 60 × 50 × 40 cm as packed. That makes the stage a lift with gear and a clear route rather than a bench job, and the box goes through a standard door.

What are the signs that the stage needs renewal?

Possible signs can include falling free air delivery at the same rated pressure, rising discharge temperature, higher power for each unit of air, and growing vibration at the bearing housings. Metal traces in the oil sample add a second line of evidence well before a failure.

Can the stage be rebuilt instead of replaced?

A rebuild keeps the original rotors and housing and renews the bearings, seals and gaskets, and it suits a stage with clean rotor surfaces and a clean bore. A complete 1616626081 returns the machine to its original specification in one step. The decision follows a teardown inspection.

How do I order a replacement for my compressor?

Read the number on the stage being replaced, which reads 1616626081 or 1616626090, and note the model and serial number from the compressor nameplate. Send them to Seadweer and the fitment is confirmed before the order is placed.

More Parts List

If you need other Atlas Copco air compressor parts, we provide more models in the table below. Please check it or contact us for details.