Description
The 1616727581 is the ELEMENT LP-T3, the low-pressure oil-free screw element that Atlas Copco lists for the ZR and ZT 30–55 VSD compressors, with the VSD+ and FLX builds of the same range drawing the stage through their own ordering code. It is the first compression step of a two-stage oil-free package, and it is renewed as a complete factory assembly rather than rebuilt in place.
The stage carries one number in two printed forms. The item record names it as the 1616727581, and the same element is printed in the form 1616 7275 81 on the housing plate and across the build documents. It is listed as serialized, so a plate on each unit identifies it on its own rather than by family alone.
Packed, the 1616727581 measures 45 × 45 × 52 cm and weighs 90 kg, and Belgium is recorded as the country of origin. This article sets out what the LP-T3 designation covers, which machines take the stage, how the two ordering routes work, and how fitment is confirmed before an order is placed.
Identity of the 1616727581 Element
An element is the core compression stage of a screw compressor, and the 1616727581 fills that role as the LP-T3 stage. It converts shaft power into air flow at pressure, and it is a long-life factory assembly: the rotor pair, the housing and the bearings are built as one and renewed as one.
The interfaces on that assembly are set by the machine it was built for, which is why the 1616727581 is ordered against a compressor record rather than against a description.
What the LP-T3 Designation Covers
LP stands for the low-pressure position, the first compression step of the two-stage oil-free packages in the ZR and ZT ranges. T3 is the stage code Atlas Copco records for this element, and it separates the LP-T3 from the other stages of the same oil-free family.
Atlas Copco prints the same number in two forms. The ten-digit form 1616727581 is what the item record carries, and 1616 7275 81 is the printed form used on the housing plate and the build documents. Both name the same stage, and either one can be used when a renewal is being confirmed.
One Stage, Two Ordering Routes
The 1616727581 itself is the element, but the route an order takes depends on the build of the machine it goes into. Atlas Copco records one service kit reference for the ZR and ZT 30–55 VSD builds and a separate DT reference for the VSD+ and FLX builds of the same range.
Both routes deliver the same stage position, so the practical question for a renewal is not which number is correct but which build the machine carries. That question is settled from the nameplate, and the sections below take each route in turn.
Compressors That Take the 1616727581
Atlas Copco lists the 1616727581 for its oil-free ZR and ZT 30–55 VSD platform, and the coverage extends across the VSD+ and FLX builds of the same model range. The table below collects the documented coverage.
| Model range | Build | Stage role |
| ZR 30–55 | VSD | Low-pressure element |
| ZT 30–55 | VSD | Low-pressure element |
| ZR/ZT 30–55 | VSD+ | Low-pressure element |
| ZR/ZT 30–55 | FLX | Low-pressure element |
The ZR/ZT 30–55 VSD Range
The ZR and ZT 30–55 VSD compressors are oil-free rotary screw machines with variable speed drive, built for plants that cannot allow lubricant into the air they produce. In the parts records for these machines the 1616727581 appears as the LP-T3 low-pressure element.
The stage is the point in the package where oil-free air quality is first set, because everything the high-pressure stage receives passes through the low-pressure position before it.
The VSD+ and FLX Builds
The VSD+ and FLX builds share the compression platform and the same low-pressure stage, and Atlas Copco records the 1616727581 for them under their own ordering code rather than the VSD kit reference. The stage itself does not change between the builds; what changes is the reference an order is placed against.
That distinction matters at the counter, not in the machine. A fitter reading the housing plate sees the same element number on every build in the range, and the build decides only which route the order follows.
Why Fitment Is Confirmed per Machine
The ZR and ZT oil-free ranges do not draw on a single element number. Different generations and configurations of the same model family carry different stage codes, and which one applies is decided by the build of the individual machine.
That is why the 1616727581 is confirmed from the parts list for a machine serial number rather than from the model name alone. Two machines that read almost the same on the badge can take different stages, and the record is what settles it.
Ordering Through the Service Kits
Atlas Copco channels the renewal of this stage through two references, one per build. Neither reference replaces the element number; both name the route the order takes for a given machine.
Kit 1837035000 for ZR/ZT 30–55 VSD
For the ZR and ZT 30–55 VSD builds, the 1616727581 is ordered through service kit 1837035000. The kit reference groups the stage with what the build needs around it, so the renewal arrives as one documented package for that machine family.
Where a machine file carries the kit number, it describes the same stage position the element number names. Both references can appear in the same record, and they resolve to one stage.
DT 8153349455 for VSD+ and FLX
For the VSD+ and FLX builds, the ordering reference is DT 8153349455. The DT prefix marks the route for those builds, and the 1616727581 sits behind it exactly as it sits behind the kit reference on the VSD machines.
Reading the build off the nameplate is what picks the route. Once the build is known, the reference follows, and the stage that arrives is the same LP-T3 either way.
The Low-Pressure Position in a Two-Stage Unit
Oil-free packages of this range compress in two stages with cooling between them, and the two positions take different elements. The 1616727581 is the low-pressure stage, the first compression step where ambient air is brought to an intermediate pressure.
What the LP Stage Does
The rotor pair of the 1616727581 turns in a precision-bored housing with nothing added to the compression chamber, so the air moving through it picks up no lubricant from the stage itself. Timing gears at the drive end hold the rotors in phase, and precision rolling bearings carry the shaft loads.
The discharge of the low-pressure position feeds the second stage, so its output condition shapes what the whole package delivers. A stage renewed here restores the first half of that chain.
Stage Pairing and the HP Position
The high-pressure position of the same machine draws a different element, recorded under its own number for each build. The two stages are ordered separately, and the parts list for the machine names each one.
When a package reaches renewal age, both positions are read from the machine record rather than assumed together. The 1616727581 covers the low-pressure position only, and its counterpart is confirmed the same way: from the parts list for the serial number.
Handling the 90 kg Stage
At 90 kg and 45 × 45 × 52 cm, the 1616727581 sits in the middle of the handling scale: too heavy to swing by hand, small enough to move with the gear most workshops already run. The figures describe the unit as it is supplied, and they shape the route from the unloading point to the machine.
Dimensions and Moving Plan
The compact envelope reaches the machine on a pallet or in a case, and the openings it has to pass are measured in advance: doorway widths, lift capacity and the standing room in front of the machine. A hoist or engine crane rated for the 90 kg of the 1616727581 covers the lift, and the slinging keeps the load level through the move.
The stage is carried on its mounting faces and never on its shaft. Port caps stay in place until the moment of fitment, so nothing reaches the bore while the unit is exposed.
Setting Down and the First Run
Before the machine is closed up, the mounting faces are cleaned and checked for burrs, the drive layout is inspected, and alignment and direction of rotation are confirmed. Once running, the machine is brought up unloaded and watched while the readings settle.
Discharge temperature, pressure and vibration are logged through the first running period, and fasteners are re-torqued after the first hours. That short log becomes the baseline for every later check on the 1616727581.
Wear Signs and Renewal Timing
Renewal of the 1616727581 is decided on condition rather than on a fixed hour count. Two lines of evidence carry most of that decision, and both read best as trends taken at a fixed interval rather than as single figures.
Possible Warning Signs
The rotor coating is what changes first. As it wears, the running gap opens and the low-pressure stage delivers less air at the same shaft power, so a falling free air delivery measured at the rated pressure is the reading that follows that change. Discharge temperature at a steady load moves with it.
Three further readings carry the same story:
- More power drawn for each unit of air delivered at a steady load, which separates a worn 1616727581 from a machine whose demand has changed.
- Vibration at the bearing housings, read at a fixed interval so the level forms a trend rather than a single figure.
- Noise around the stage, which moves with bearing condition and is worth recording alongside the vibration figures.
Timing the Renewal
Left unchecked, bearing fatigue can end with the rotors touching, and at that point the stage is written off rather than renewed. A planned renewal avoids that outcome, because the unit is changed while the frame, the drive and the pipework are still in good order.
The unit number recorded in the machine file is what makes that timing judgement easier, since it ties the readings to a known stage rather than to a model in general.
Ordering the 1616727581 Through Seadweer
Two pieces of information lock the order down: the number on the stage being renewed, which reads 1616727581 or 1616 7275 81 in the printed form, and the model and serial number from the compressor nameplate. The nameplate also settles which build the machine carries, which decides the ordering route.
Machine Record Check
Send both to Seadweer and the parts desk checks the number against the machine record and confirms the 1616727581 in one pass, together with the ordering reference for the build. Where the number on the old stage has worn away, the nameplate is enough on its own, because the parts list for the machine names the stage it was built with.
Plants that run several compressors keep a short record for each machine: model, serial number, build 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 1616727581 is quoted.
What the Quotation Confirms
The quotation repeats the item data of the 1616727581: the LP-T3 designation, the packed size, the weight, the country of origin and the tariff code, together with the ordering route for the build. One confirmation covers the whole renewal, so the workshop plans the lift and the stop without a second enquiry for the same stage.
Send the machine details with the enquiry and the answer comes back with the fitment already checked. That is the whole of the ordering process for a 1616727581 renewal.
Technical Specifications
The tables below collect the identification data and the physical figures recorded for the 1616727581.
Part Identification
| Item number | 1616727581 |
| Designation | ELEMENT LP-T3 |
| Printed form | 1616 7275 81 |
| Compression type | Oil-free rotary screw |
| Stage position | Low pressure (first stage) |
| Ordering kit, ZR/ZT 30–55 VSD | 1837035000 |
| Ordering code, VSD+ and FLX | 8153349455 |
| Serialized | Yes |
Dimensions and Weight
| Dimensions (L × W × H) | 45 × 45 × 52 cm |
| Weight | 90 kg |
| Country of origin | Belgium |
| Customs tariff code | 8414900090 |
The 90 kg weight and the 45 × 45 × 52 cm envelope describe the 1616727581 as it is supplied, and they set the handling plan for the fitting day. Seadweer confirms the current package details with the quotation.
FAQ
What is the 1616727581?
The 1616727581 is the ELEMENT LP-T3, the low-pressure oil-free screw element for the ZR and ZT 30–55 VSD compressors and the VSD+ and FLX builds of the same range. It is a complete factory assembly renewed as a unit rather than rebuilt in place.
Which compressors take the 1616727581?
The ZR and ZT 30–55 VSD machines take it as the low-pressure element, and the VSD+ and FLX builds of the same model range use the same stage through their own ordering code.
What is the difference between kit 1837035000 and DT 8153349455?
They are the two ordering routes for the same stage. Kit 1837035000 is the route for the ZR/ZT 30–55 VSD builds, and DT 8153349455 is the route for the VSD+ and FLX builds. The 1616727581 sits behind both.
Where does the LP-T3 sit in the machine?
It is the low-pressure stage, the first compression step of a two-stage oil-free package. The high-pressure position draws a different element under its own number, and the parts list for the machine names each one.
How heavy is the 1616727581?
The item data lists 90 kg in a 45 × 45 × 52 cm package, so the move is planned with lifting gear rated for that mass. The 1616727581 is carried on its mounting faces and never on its shaft.
How do I order a renewal for my compressor?
Read the number on the stage being renewed and note the model and serial number from the compressor nameplate. Send both to Seadweer and the fitment and the ordering route are confirmed against the parts list for that machine before the order is placed.
More Atlas Copco 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.
| Part Number | Part Name | Part-Number |
|---|---|---|
| 1616727181 | ELEMENT HP T2 | 1616-7271-81 |
| 1616728190 | O.I.S. K-36 | 1616-7281-90 |
| 1616725794 | OIS S2 | 1616-7257-94 |
| 1616725791 | OIS-N-02 SERVICE ELEMENT | 1616-7257-91 |
| 1616725790 | OIS-N-01 SERVICE ELEMENT | 1616-7257-90 |
| 1635452300 | BRACKET | 1635-4523-00 |
| 2252283500 | PANEL | 2252-2835-00 |
| 1621505334 | PULLEY | 1621-5053-34 |
| 1624641446 | PIPE GREEN 10MM2 | 1624-6414-46 |
| 1623811783 | MOTOR | 1623-8117-83 |
| 1515439100 | WASHER | 1515-4391-00 |
| 1901008427 | Belt | 1901-0084-27 |
| 2202738710 | PANEL FRONT A 9-10 9002 | 2202-7387-10 |
| 2204158916 | PANEL FRONT TRAFO C55DD 7021 | 2204-1589-16 |
| 3002601631 | FILTER MATS (TYPE P300) | 3002-6016-31 |
| 1092000019 | INLET BAFFLE ASSEMBLY | 1092-0000-19 |
| 1092000235 | 0OTOR SERVICE KIT FOR SCD110K | 1092-0002-35 |
| 2204007558 | FILTER ELEMENT-P-130-20CN3UM | 2204-0075-58 |
| 1621496200 | FRAME | 1621-4962-00 |
| 1631041241 | ROOF ASS’Y DRYER C90 | 1631-0412-41 |
| 1614959284 | DOOR | 1614-9592-84 |
| 1650110192 | CORE COMPRESSOR | 1650-1101-92 |
| 2900251200 | SKN20/16 | 2900-2512-00 |
| 2205615426 | VESSEL | 2205-6154-26 |
| 1650110298 | CORE COMPRESSOR | 1650-1102-98 |
| 1635506208 | FAN RADIAL | 1635-5062-08 |
| 1310179500 | PLATE-DOOR | 1310-1795-00 |
| 1202214300 | WORMWHEEL | 1202-2143-00 |
| 2205677777 | OIL – STANDARD – 209L-RED | 2205-6777-77 |
| 2107527479 | FILTER AIR JUNAIR | 2107-5274-79 |
| 1630700508 | KIT VALVE MINIMUM G25F | 1630-7005-08 |
| 1624447200 | PIPE | 1624-4472-00 |
| 1629102480 | PIPEWORK | 1629-1024-80 |
| 1089961176 | CHOKE | 1089-9611-76 |
| 1627226500 | PIPE | 1627-2265-00 |
| 2230008591 | ENERGY RECOVERY S1 C | 2230-0085-91 |
| 1504220028 | FILTER AIR | 1504-2200-28 |
| 1625162504 | INLET HOSE | 1625-1625-04 |
| 1092163050 | BAFFLE | 1092-1630-50 |
| 1614087600 | HOSE 8 X 480 X 8 | 1614-0876-00 |
| 1901061488 | FLEXIBLE 1 N2 LG 1700 | 1901-0614-88 |
| 1635370100 | GRATING | 1635-3701-00 |
| 2205490700 | SMART/LU5-15 2KH SERVICE KIT | 2205-4907-00 |
| 1088151213 | INSERT | 1088-1512-13 |
| 1901612299 | PISTON ROD D50MM | 1901-6122-99 |
| 1614933400 | GEAR WHEEL | 1614-9334-00 |
| 1649959407 | BAFFLE ROOF WITH EARTH STUD | 1649-9594-07 |
| 2900015200 | HOSE | 2900-0152-00 |
| 1625167906 | FOAM AREA | 1625-1679-06 |
| 1900221385 | CUBICLE | 1900-2213-85 |
Diego Ferrer –
Our machine file calls the stage by the element number, while the service kit my predecessor ordered carried a different reference, and that mismatch is what slowed the last renewal. This time we sent the compressor serial with the enquiry and the answer named both: the 1616727581 as the stage and the kit reference our build is serviced through. The element arrived at 90 kg in a compact box, went into the low-pressure position without improvisation, and the first run held its readings where the old log ended.