Description
The 1616774591 is the Atlas Copco C67 OIS H-11 oil-injected screw element, the compression stage that turns drive power into compressed air in an oil-injected screw compressor. The stage is listed in the item data under the designation OIS H-11, and it belongs to the C67 element platform. Two further references travel with it: the production number 1616774581, stamped on the element nameplate, and the current C67-H12 stage, ordered as 1616998490.
This article sets out the identity of the 1616774591, the numbers that travel with it, the machines the stage is confirmed for, and the figures a planner needs before ordering.
Identity of the 1616774591 Element
An element is the heaviest spare a compressor owner orders, and its identity rests on the designation in the item record together with the numbers that travel with it. For the 1616774591 the record carries one designation and two further references, and reading them together is what keeps an order on track.
What the OIS H-11 Designation Covers
The item data lists the 1616774591 as OIS H-11. The OIS marks the stage as oil-injected screw, the H-11 gives the version within the C67 element family, and the two together place the part in the injected-screw side of the Atlas Copco element range.
The same record places the 1616774591 in the rate group S3K Oil injected screw, Element. That group is where the item sits in the compressor parts classification, and it confirms the stage as a compression element rather than a filter, a valve or a control part.
As packed, the 1616774591 measures 36 × 23 × 19 cm and weighs 32.37 kg, which makes it a two-person handling job with lifting gear rather than a bench item. The figures belong in the machine file beside the identification, because they set the lifting plan for the fitting day.
The Production Number 1616774581
The 1616774591 is also recorded under the production number 1616774581, and that number is stamped on the element nameplate beside the unit serial number. The production number is the reference used when the element is fitted to new machines, while the service number is the order code used when the stage is ordered as a spare.
Both numbers name the same C67 element, and a machine file can carry either one. When a record shows 1616774581, the enquiry that follows still reaches the same stage, and Seadweer reads the pair as one identification rather than as two parts.
Keeping both references in the file matters at the point of ordering, because a workshop reading the production number off the nameplate and a planner reading the service number off a spare-parts list are looking at the same item. The 1616774591 is the reference this article uses throughout.
Where Orders Go Today: the C67-H12
Atlas Copco has upgraded this stage to the C67-H12 element, ordered as 1616998490. The direction follows a version step within the C67 family: the H-11 stage listed here is the reference in the documentation of machines already in service, and the H-12 is the current version of the same position.
In practice the ordering conversation runs in two steps. A plant reads the code on the old element tag, finds the 1616774591 or the production number 1616774581 in its records, and the order is then placed under the current 1616998490. Seadweer performs that check with every quotation, so the number in the machine file and the number on the order do not contradict each other.
Nothing about the direction changes the position of the stage in the machine. The 1616774591 stays the compression stage of the compressor, and the machine documentation keeps it as the element reference for the build it was fitted to.
Confirmed Machine Applications
The 1616774591 is not tied to a single compressor family. Parts documentation places it across three product lines within the group, and the sections below list the machines each reference confirms.
G 15, G 18 and G 22
The G 15, G 18 and G 22 oil-injected screw compressors use the C67 element as a standard stage. The official Atlas Copco parts list for the G 15, G 18 and G 22 range carries the element under the printed number 1616 7745 81, with the service entry beside it reading SERVICE AIREND C67 H11.
That parts list is the direct link between the element and the three machines, and the printed form 1616 7745 81 is the same number as 1616774581 in its two printed formats. It is the reason the G models open the confirmed list for the 1616774591.
The Atlas Copco XAS 88 KD
On the mobile side, the 1616774591 is confirmed for the Atlas Copco XAS 88 KD portable compressor. The XAS range uses an injected screw element as its core stage, and the C67 H-11 element is the one recorded for the XAS 88 KD unit.
The same element family serves both stationary plant and portable machines, and the difference between the two applications sits in the machine package rather than in the core stage. That is why one element number appears in both a fixed G-series compressor and a portable XAS unit.
Chicago Pneumatic CPVSd and CPM Ranges
The same element number appears in the Chicago Pneumatic parts lists, which belong to the same group as Atlas Copco. The 1616774591 is listed for the CPVSd 21, CPVSd 25, CPVSd 29 and CPVSd 34 variable-speed compressors, and for the CPM 21, CPM 25 and CPM 30 models.
In those lists the stage is entered as SPARE ELEMENT OIS H-11, the same designation the Atlas Copco record carries. The CPVSd and CPM entries are direct parts-list references rather than a family match, so the stage is confirmed for those machines on the same footing as the G-series units.
For any machine not named here, the fitment is confirmed against the compressor record rather than from the family name, because the version and the build decide the exact stage.
What the Oil-Injected Screw Element Does
The 1616774591 is an oil-injected rotary screw element, the air end that turns drive power into compressed air. Its working principle explains both its efficiency and its service profile.
The Rotor Pair and the Oil Film
Two intermeshing helical rotors spin inside a precision-bored housing. Injected oil seals the running clearances between the rotors and the housing, carries the compression heat away and lubricates the bearings, so the rotors stay separated by an oil film rather than by metal-to-metal contact.
Air enters the stage after filtration, is compressed along the rotor path and leaves at working pressure, and the oil is removed downstream by the separator of the host machine. Because the oil does three jobs at once, the stage holds its efficiency over long runs.
Why Bearing Condition Drives Renewal
Wear in an injected screw stage concentrates in the bearings rather than in the rotors, because the oil film keeps the rotor surfaces apart. The bearing set carries the radial and thrust loads of the rotor pair, and its condition is the reading that drives renewal decisions on the 1616774591.
The oil circuit of the host machine is part of the working environment of the stage, so oil quality and separator condition belong to the service life of the 1616774591. A stage that runs on clean oil and a sound separator holds its clearances across the service window the machine defines.
Serialization and Traceability
The 1616774591 is a serialized item, and every unit carries a unique serial number on its nameplate. That record is what makes an individual stage traceable from the works to the machine it was fitted to.
The nameplate of the element carries two lines: the part number 1616774581 and a unit serial number. Those two together identify one specific stage, which is the level of detail a service file needs when a compressor runs several elements of the same family over its life.
Reading the Nameplate Record
When a stage is renewed, the serial number on the outgoing element and the number on the incoming one are both worth recording. The pair links the machine history to the exact unit that ran in it, and it resolves any question about which element a past invoice referred to.
The same record is what the parts desk asks for at the point of ordering. Model, serial number and element number taken together from the compressor nameplate give the check everything it needs to confirm the 1616774591 against the machine build.
Planning with the Serial Number
A planned renewal reads the element number off the compressor nameplate and matches it to the spares list before the 1616774591 is ordered. Because the stage is serialized, the unit that arrives can be logged against the machine on the same line as the one it replaces.
Keeping the serial record current costs nothing at the time and saves a search later, when a plant needs to know which element is in which machine.
Wear Signs and Renewal Timing
A stage of this class announces its aging through measured trends long before it fails outright, and the trends are readable with the instruments most plants already run. On the 1616774591 the trends matter more than any single reading, because the stage works on every running hour.
Possible Warning Signs
Possible signs of element wear can include rising specific energy, drifting discharge pressure, unusual noise or vibration, higher oil temperature and metal traces in the oil sample. A rise in specific power is one of the first readings a plant can see, because widening internal clearances let compressed air slip back instead of leaving the stage.
Any of those trends is a reason to inspect the stage and plan the renewal. On a machine that carries a whole production section, the inspection is worth doing before the next planned stop rather than during a breakdown.
Timing the Renewal
Oil-injected elements commonly reach their first major bearing service somewhere in the 20,000 to 40,000 running-hour range as a family-level reference, but the real timing follows the condition of the machine and the service documentation that applies to it rather than a fixed hour target.
Vibration checks, oil analysis and temperature trends predict bearing condition long before a fixed count is reached. A planned renewal with the 1616774591, ordered under the current number, beats an unplanned stop, because bearing fatigue left alone can let the rotors seize, which writes off the element rather than allowing a repair.
The 4,000 and 8,000 hour services of the host machine cover the consumable parts such as filters and oil, and they are separate from the element renewal. The stage is a long-life component, and its renewal is planned on condition rather than on the routine service count.
Handling and Installation Notes
The 1616774591 is a lifting job with a clear route from the store to the machine, and the 32.37 kg weight and 36 × 23 × 19 cm case size belong on the plan for the fitting day.
Lifting and Preparation
The 1616774591 is moved with lifting gear and kept in its case until it reaches the machine, because the rotor bore and the shaft end are the two faces that set the running clearances. The mounting face of the host machine is cleaned before the stage goes in, and the drive coupling is aligned to the element shaft.
Fitting and Run-In
Once the 1616774591 is in place, the oil circuit of the machine is refreshed and the separator is checked at the same visit. The machine is then run in under observation, so the pressure band and the oil temperature settle back to their normal readings before the compressor returns to full duty.
Because the renewal of the 1616774591 replaces the whole stage in one step, there is no rebuild kit to plan and no second visit to finish the job.
Ordering the 1616774591 Through Seadweer
Two references and one ordering direction are enough to make the order unambiguous, and the check that ties them together is worth one message.
Machine Record Check
Send Seadweer your compressor model and serial number, and the team checks the machine record against the 1616774591 before the quotation is issued. If your paperwork still shows the production number 1616774581, the check resolves it in the same pass, because both numbers name the same C67 element.
The same check confirms the ordering direction for the 1616774591, so the stage that arrives matches the position the machine needs.
What the Quotation Confirms
The quotation repeats the item data of the 1616774591: the designation, the box figures and the complete single-stage scope of the order. One confirmation covers the whole renewal, so the workshop can schedule the swap without waiting for a second item.
Send the model and serial number from your compressor nameplate to Seadweer, and the parts desk confirms the match and prepares your quotation.
Technical Specifications
The tables below collect the identification and physical data of the 1616774591 in one place, as the item data lists them.
Part Identification
| Item number | 1616774591 |
| Designation | OIS H-11 (C67 H-11) |
| Production number | 1616774581 |
| Current version | C67-H12 (1616998490) |
| Compression type | Oil-injected rotary screw |
| Rate group | S3K Oil injected screw, Element |
| Product group code | PCOM |
| Serialization | Serialized unit, unique serial number on the nameplate |
| Applications | G 15 / G 18 / G 22, XAS 88 KD, CPVSd 21-34, CPM 21-30 |
Dimensions and Weight
| Dimensions (L × W × H) | 36 × 23 × 19 cm |
| Weight | 32.37 kg |
| Country of origin | Belgium |
| Tariff code | 8414900090 |
The figures above are the item data of the 1616774591 for handling and logistics reference. The two tables together are the data sheet of the stage, and Seadweer repeats them with the quotation so the workshop knows what arrives before it arrives.
FAQ
What is the 1616774591?
The 1616774591 is the Atlas Copco C67 OIS H-11 oil-injected screw element, the compression stage of an oil-injected screw compressor. The item data lists it under the designation OIS H-11 within the C67 element family.
What is the difference between 1616774591 and 1616774581?
They are two references for the same C67 element. The 1616774581 is the production number stamped on the nameplate, and the 1616774591 is the service number that spare-parts orders are written against.
Which machines use the 1616774591?
The stage is confirmed for the Atlas Copco G 15, G 18 and G 22, for the XAS 88 KD portable compressor, and for the Chicago Pneumatic CPVSd 21 to CPVSd 34 and CPM 21 to CPM 30 ranges. For any machine not listed, the fitment is confirmed from the compressor record rather than from the family name.
Is the 1616774591 still the current version?
Atlas Copco has upgraded the stage to the C67-H12, ordered as 1616998490. The 1616774591 remains the reference in the documentation of machines already in service, and Seadweer confirms the ordering direction with every quotation.
How heavy is the 1616774591?
The item data lists 32.37 kg and 36 × 23 × 19 cm as packed. Lifting gear and a clear floor route belong on the plan for the fitting day.
How do I order a renewal for my compressor?
Send Seadweer the compressor model and the serial number from the nameplate, and the parts desk checks the machine record against the 1616774591 before the quotation. The same check resolves the production number 1616774581 if your records show it.
More Air Compressor Parts List
If you require other Atlas Copco air compressor parts, additional models can be found in the table below. Please review it or contact us for details.
| Part Number | Part Name | Part-Number |
|---|---|---|
| 1616774590 | SERVICE AIREND C67 H10 | 1616-7745-90 |
| 1616777381 | ELEMENT COMPR. | 1616-7773-81 |
| 1616770081 | ELEMENT | 1616-7700-81 |
| 1616765195 | ELEMENT C80 I-05 SPARE | 1616-7651-95 |
| 1616761290 | O.I.S. J-34 SERVICE ELEMENT | 1616-7612-90 |
| 1619685800 | SEAL | 1619-6858-00 |
| 2250567700 | GEAR | 2250-5677-00 |
| 2235780780 | BACK PANEL ASS’Y SDR | 2235-7807-80 |
| 1635453700 | PIPE | 1635-4537-00 |
| 1622344400 | STAY | 1622-3444-00 |
| 1901015129 | cylinder | 1901-0151-29 |
| 1625157683 | SERVICE DOOR ASSEMBLY | 1625-1576-83 |
| 1310035309 | WINDOW | 1310-0353-09 |
| 1310034696 | HANGER | 1310-0346-96 |
| 1089939845 | TERMINAL | 1089-9398-45 |
| 1900250717 | ELECTRICAL CUBICLE GA37-55 VSD | 1900-2507-17 |
| 1630800607 | AIRSAVER 16B – BALLVALVES G1 | 1630-8006-07 |
| 1310252950 | CONTACTOR | 1310-2529-50 |
| 1635382617 | DECAL UNIT | 1635-3826-17 |
| 1320404616 | IMP FIN AV6 3RD FC-4 8 BAR-E | 1320-4046-16 |
| 1624063628 | NOZZLE 4,1 | 1624-0636-28 |
| 1625180618 | THERMAL VALVE KIT | 1625-1806-18 |
| 1310030198 | INSULATION | 1310-0301-98 |
| 2205615213 | BELT-XPA1232 | 2205-6152-13 |
| 2904006900 | SEAL | 2904-0069-00 |
| 3121007200 | O-RING | 3121-0072-00 |
| 1901008756 | Filter | 1901-0087-56 |
| 2200902767 | KIT REPL. FOR AEZ4425 Y-H | 2200-9027-67 |
| 1092075835 | ELECTRIC PANEL | 1092-0758-35 |
| 1617370000 | COMPRESSOR | 1617-3700-00 |
| 1092026300 | BAFFLE ASSEMBLY | 1092-0263-00 |
| 1089961141 | MODULE | 1089-9611-41 |
| 1628280300 | LOUVER WITH ATEX MOTOR | 1628-2803-00 |
| 1202680205 | CABLE | 1202-6802-05 |
| 1614959000 | AFTERCOOLER | 1614-9590-00 |
| 1901068188 | Safety Valve-FILME COMPRESSOR | 1901-0681-88 |
| 1624623897 | HOSE DN20 PN16 L=390 | 1624-6238-97 |
| 1124080146 | KIT SHROUD+ FAN L30P | 1124-0801-46 |
| 1900223914 | CUBICLE GA15-30VSD | 1900-2239-14 |
| 1621256000 | PIPE | 1621-2560-00 |
| 1627243000 | PIPE | 1627-2430-00 |
| 1639660506 | HEAT EXCHANGER F12 | 1639-6605-06 |
| 2205710668 | LAMP A22-LED230-BA9SW | 2205-7106-68 |
| 1614833900 | PIPE | 1614-8339-00 |
| 1613976304 | CABLE (TRACING 2500MM) | 1613-9763-04 |
| 1617439400 | INSULATION HE 3ROWS | 1617-4394-00 |
| 1621241800 | GEAR WHEEL-FILME COMPRESSOR | 1621-2418-00 |
| 1627012100 | FRAME TRIPLEX MED | 1627-0121-00 |
| 0333222900 | WASHER-SPRING | 0333-2229-00 |
| 1901010130 | Lock spring | 1901-0101-30 |
Sipho Ndlovu –
Our service file carried a C67 element for a G18 that was due for renewal, and the number on the old tag did not match what we had written down. Seadweer read the model and the serial number off the nameplate and confirmed the stage against the current ordering number before we placed the order. The element arrived as a complete unit in its case, and our fitters had it in place with the usual lifting gear. The machine has held its pressure band since the change.