Atlas Copco 1616772590=1616772580 OIS I-04 Oil-Injected Screw Element (C80 VSD+)

Description

The 1616772590 is the OIS I-04 service element, the oil-injected screw stage behind the C80 VSD+ designation and the GA 18-37 VSD+ machine family. Two features set this element’s working life apart from a fixed-speed equivalent. The first is the drive: a VSD+ machine varies its motor speed to follow air demand, so the element spends its hours across a moving range of rotor speeds instead of one fixed point. The second is the family: OIS marks the oil-injected screw branch, where oil inside the compression chamber seals the rotor clearances and carries the heat of compression away. The element measures 39 x 39 x 29 cm and weighs 61 kg, and its condition shows up directly in the two numbers a VSD+ machine reports best: delivery and specific power.

This page records the identification and physical data for the 1616772590, explains how the two ordering references for this element work, and describes what speed-controlled oil-injected duty means for wear, monitoring and renewal. It is written for the maintenance planner and the parts buyer looking after VSD+ machines in the GA 18-37 class, and it keeps the 1616772590 in view through every step, because that number is what the order, the delivery and the maintenance record will all carry.

What OIS I-04 Stands For

The designation breaks into three parts. OIS is the Atlas Copco family mark for Oil-Injected Screw elements. I-04 identifies the size class within that family — the small end of the industrial oil-injected range, where the stage serves machines from 18 to 37 kilowatts. The C80 VSD+ reference in the machine documentation ties the element to its matched drive train: element, motor and drive are sized together for the speed range the machine runs. The complete ordering number is what selects the part, and the 1616772590 is printed on the element plate with the serial.

The element carries a second reference, 1616772580 — the production number recorded in the machine’s parts list from the factory. The pair works like this across the Atlas Copco service system: production numbers live in the machine documentation, service numbers live in the ordering system, and both point at the same physical stage. Nothing is gained by guessing which one a document will show; the plate, the parts list or a previous quotation will produce one of the two, and either — 1616772590 or 1616772580 — is enough to identify the element when it arrives with the machine details.

For ordering, the 1616772590 is the number that keys the quotation, the order confirmation and the supply documentation. Quoting it in the first message closes identification before the conversation starts — a small element for a small machine, but the same discipline that governs every renewal in the range: the number selects, the machine confirms, and the two travel together in one message.

Technical Specifications

The tables below list the data recorded for the 1616772590 as supplied through the service channel.

Part Identification

Dimensions and Weight

Each 1616772590 leaves the factory serialized, and the number on the plate ties the physical element to its documentation through installation and every service event after it. Keep the serial together with the machine’s maintenance file: for a VSD+ machine the file is especially worth keeping complete, because the drive’s operating logs and the element’s history read together tell the real story of the stage’s condition — and a complete file turns the next 1616772590 enquiry into a one-message confirmation.

Oil-Injected Compression on a Variable-Speed Machine

The compression cycle of the 1616772590 follows the oil-injected screw principle. Air enters the inlet port, the meshed helical rotors reduce its volume as their chambers turn, and oil is injected into the chamber along the way — sealing the clearances between the rotors and the housing, absorbing the heat of compression, and leaving with the air to be separated and cooled in the machine’s circuit before returning to injection. The delivered air is oil-metered through separation, which is the working difference between the OIS family and the oil-free OFS and OFT branches.

The VSD+ drive changes how the element spends its life, not how it compresses. On a fixed-speed machine the rotors run at one speed and the machine loads and unloads to follow demand; on a VSD+ machine the drive varies the speed continuously, so the element’s operating hours spread across a range of speeds matched to the plant’s real air consumption. The compression chamber works identically at every point in that range: oil injected, clearances sealed, heat carried off. The components that age — bearing sets, shaft seals and the rotor coating that keeps the non-contact gap working — are the same as in any oil-injected stage, and they are renewed with the element as a whole.

That last point is the practical one for the planner. The 1616772590 arrives as one complete factory-set assembly — rotors, bearings, seals and clearances set at the factory — so a renewal restores the whole internal condition of the stage in one exchange, with no on-site rebuild between delivery and the return to rated output. Fitting a renewed 1616772590 is how a VSD+ machine gets its efficiency curve back, not merely its delivery.

Wear Signals on a Speed-Controlled Stage

A VSD+ machine is a good instrument for its own air end, because the drive’s behavior exposes what a fixed-speed machine can hide. As the 1616772590 wears and its internal clearances begin to leak, the drive compensates: it runs at higher speed to hold the same pressure and delivery, and the logged speed profile climbs month over month. Specific power rises with it — more kilowatt-hours for each cubic meter of air. Discharge temperature drifts upward, and noise or vibration at the stage sharpens as bearing clearances grow. The drift in the drive’s speed history is often the earliest visible signal of all.

The trend line is what settles it. A slow climb across months of logs tells one story; a step change after a separator, cooler or filter fault tells another, and the log separates the two before the stage is charged with anything. When the trend points at the element, the 1616772590 goes on order while the service window is being set, and both are ready together. Running a worn stage to the end of its life is the outcome worth ruling out: internal contact in a screw element does not stop politely, and the repair that follows a failure costs far more than the planned exchange ever would. Renewing on condition — with the 1616772590 fitted inside a booked window — keeps the timing with the maintenance calendar and restores the machine’s efficiency curve in one operation.

Handling and Fitting

At 61 kg the 1616772590 sits in the light-mid class of handling: a strong pair of hands with good lifting posture manages the final positioning, and a shop hoist or pallet-truck-and-slings arrangement keeps the move to the machine effortless. The element stays crated and capped until it stands at the machine, so nothing enters the chamber on the way in. Mounting faces are cleaned, the drive connection is aligned, fastener torques follow the values in the compressor manual, and the oil circuit is reconnected before the machine is closed up.

The serial numbers of the old and new elements, with the 1616772590 reference recorded alongside each, go into the maintenance record before the machine returns to load. Fitted this way, the 1616772590 exchange fits inside a scheduled service stop measured in hours, and the VSD+ drive goes back to doing what it was designed for: following the plant’s demand across its speed range on a stage with factory-fresh clearances.

Ordering the Correct Element

Two details close the identification: the element number and the machine. The 1616772590 is read from the plate on the element being replaced, from the service documentation or from a previous quotation, and the compressor is identified by the model and serial number on its nameplate. Send the pair together and the match is confirmed in one pass — no chain of follow-up questions, and no risk of the C80 VSD+ reference being matched to the wrong size class.

If the production number 1616772580 is what the parts list shows, send it as it appears: the service reference for ordering is returned with the confirmation, and the correct 1616772590 goes on order with the changeover scheduled into the window the maintenance team has set. One message with a plate photograph and the nameplate details starts all of it.

FAQ

What does OIS I-04 (C80 VSD+) stand for?

OIS is the Atlas Copco family mark for Oil-Injected Screw elements, I-04 identifies the size class, and the C80 VSD+ reference ties the element to the machine family it serves — the GA 18-37 VSD+ range. The ordering reference is 1616772590, and that number identifies the part in quotations, order confirmations and the supply documentation.

Which number do I use to order, 1616772590 or 1616772580?

Either identifies the same element, but the 1616772590 is the service number the ordering system uses. If your machine parts list shows the production number 1616772580, send it as it appears and the service reference comes back with the order confirmation.

Does a VSD+ machine need a different element than a fixed-speed one?

The compression principle is the same — oil injected into the chamber to seal and cool — but the element is matched to the machine: the C80 VSD+ stage is sized for the drive train and speed range of the VSD+ machines it serves. Matching the exact number from the plate, or the machine nameplate details, is what guarantees the correct element either way.

What handling does a 61 kg element need?

A shop hoist or pallet-truck-and-slings arrangement for the move, and a strong pair of hands with good posture for the final set — no crane and no heavy rigging. The 1616772590 stays crated and capped until it stands at the machine, and the exchange fits inside a scheduled service stop of a few hours.

What happens if a worn element stays in service?

On a VSD+ machine the drive hides the delivery loss first — it simply runs faster to compensate — while the logged speed profile and specific power climb month over month. Internal contact at the end of that path finishes the rotor profiles for good. Renewing the 1616772590 on condition restores the efficiency curve in one planned operation.

Is the element supplied as a complete assembly?

Yes. The 1616772590 arrives as one factory-set unit with the rotor pair, bearings and shaft seals in place and the clearances set at the factory, so the renewal is an assembly exchange with no on-site internals work. The element is serialized, and the plate number links it to its documentation through installation and service.

Genuine Atlas Copco Supply from Seadweer

Seadweer supplies original Atlas Copco compressor parts for fixed-speed and VSD+ machines alike. Send the plate number from your element together with the machine nameplate details, and the 1616772590 match is confirmed with a quotation to follow.