An Air-Cooled Fixed-Speed Dry Type Oil-Free Screw Air Compressor gives a factory a way to specify dry oil-free compression without building the compressor package around a cooling-water connection. The practical decision is about the whole installation: how much air the process needs, where compression heat will go, and how the machine will operate alongside receivers and treatment equipment. SEIZE AIR's fixed-speed two-stage SWT selection provides a clear starting point, with separate air-cooled mechanical entries that can be carried directly into an equipment review.
An air-cooled compressor rejects heat through cooling air, so its location matters to the package's operation. The plant needs an intake route, a discharge route and an arrangement that limits hot-air recirculation. Choosing air cooling therefore moves an important part of the utility discussion into the room layout and ventilation design.
This can be a useful route where an appropriate cooling-water service is unavailable or where the project deliberately prefers an air-cooled package. Review that preference against the proposed location, surrounding heat sources and service access. The best installation is one whose cooling arrangement the factory can support throughout production, including periods when other nearby equipment is operating.
The dry screw compression process keeps lubricating oil out of the compression chamber. In the selected two-stage arrangement, air passes through successive compression stages rather than using an oil-injected airend. The machine still has mechanical systems that require lubrication, including the relevant bearings and drive components, so oil-free compression does not mean the entire package contains no lubricant.
This distinction helps engineering define the product correctly. It also helps purchasing distinguish a dry oil-free compressor from an oil-injected package followed by downstream filtration. Identify the required compression technology and the required delivered-air condition separately, then bring them together in the selected compressor and treatment arrangement.
Before asking for an air-cooled offer, describe the pressure and simultaneous airflow required by production. Add the location, electrical supply and any existing air-system equipment that will remain in service. A replacement installation and a new dedicated line can have very different interface requirements even when the compressor motor rating is similar.
Define which equipment belongs in the quotation. The compressor package, receiver, dryer, filters, distribution pipework and room ventilation each have their own role. A clear boundary lets the supplier prepare a useful offer and helps the plant identify work that must be designed or purchased separately before the machine can enter service.
If suitable cooling water is already available, compare both arrangements against the site's utilities and operating practices. Air cooling introduces a room-air heat-rejection task. Water cooling introduces the corresponding water-service requirements. Neither description alone establishes the better installation for every factory.
Compare the complete utility scope, maintenance tasks and physical arrangement. The SEIZE AIR catalogue lists different mechanical entries for air-cooled and water-cooled packages, including different outlet connections in some cases. That means the choice should be made before the layout and connection schedule are finalised, rather than treated as a small accessory decision after equipment ordering.
The following figures come from the fixed-speed two-stage dry oil-free table in the English SEIZE AIR catalogue, PDF page 6, printed pages 9–10. The model families retain their published A/W designations. The mechanical table then selects the source's air-cooling entries, so the cabinet dimensions and weight are not taken from its water-cooling rows.
The airflow table shows published capacity at the listed pressure conditions. A dash retains an unlisted source entry. Use the corresponding pressure column for selection rather than carrying a model's largest flow into every operating condition. The motor kW field is its published rating, separate from the total package input used in an energy-performance comparison.
| Published family | Motor kW | FAD at 7 bar, m³/min | FAD at 8 bar, m³/min | FAD at 10 bar, m³/min |
|---|---|---|---|---|
| SWT-37A/W | 37 | 5.60 | 5.60 | — |
| SWT-45A/W | 45 | 6.50 | 6.50 | 5.50 |
| SWT-55A/W | 55 | 8.50 | 8.40 | 6.50 |
| SWT-75A/W | 75 | 12.60 | 12.60 | 10.30 |
The catalogue identifies free air delivery for the complete package in accordance with ISO 1217 Annex C. Its stated reference conditions are absolute inlet pressure of 1 bar and intake temperature of 20°C. Keep those conditions with the capacity data when comparing the selected machine with another proposal.
A flow number stated on a different inlet or reference basis may need clarification before it can be compared directly. Ask each proposal to identify the pressure, airflow basis and relevant package scope together. That gives engineering a consistent comparison and prevents purchasing from treating figures describing different conditions as interchangeable performance ratings.
SWT-55A/W is listed with a 55 kW motor rating and capacity of 8.50 m³/min at 7 bar, 8.40 m³/min at 8 bar and 6.50 m³/min at 10 bar. In the air-cooling section, the same family has a DN50 outlet, published dimensions of 3050 × 1700 × 1700 mm and weight of 2500 kg.
Those fields belong together in an equipment schedule. If production requires the higher pressure, use that pressure's airflow during the capacity review. Keep the air-cooled dimensions with the corresponding cooling choice during layout work. Selecting capacity from one condition and physical information from another can create an inconsistent proposal before the machine has even been ordered.
| Published family | Selected cooling entry | Outlet | L × W × H, mm | Weight, kg |
|---|---|---|---|---|
| SWT-37A/W | Air | DN50 | 3050 × 1700 × 1700 | 2300 |
| SWT-45A/W | Air | DN50 | 3050 × 1700 × 1700 | 2400 |
| SWT-55A/W | Air | DN50 | 3050 × 1700 × 1700 | 2500 |
| SWT-75A/W | Air | DN50 | 3450 × 1800 × 1850 | 3100 |
For SWT-75A/W, the source lists a DN50 outlet in the air-cooling section, with dimensions of 3450 × 1800 × 1850 mm and weight of 3100 kg. Its water-cooling entry instead lists DN80, 3200 × 1950 × 1810 mm and 3000 kg. The cooling choice changes the connection and physical schedule as well as the utility requirement.
This is a useful example for checking a quotation. Require the selected cooling arrangement to appear explicitly alongside the model and pressure. The approved drawing and handling information should then identify that same configuration, giving the installation contractor a clear basis for the actual equipment that will arrive.
At 8 bar, the table lists 5.60 m³/min for SWT-37A/W, 6.50 m³/min for SWT-45A/W, 8.40 m³/min for SWT-55A/W and 12.60 m³/min for SWT-75A/W. Their motor ratings are 37, 45, 55 and 75 kW respectively. These entries create a shortlist once the plant has established the required simultaneous air demand.
The lower-demand operating states matter too. A fixed-speed machine should have an understandable role when production is reduced, during changeovers and when another compressor is available. Include those states in the selection discussion rather than choosing the largest affordable capacity without explaining how the station will use it.
The dry oil-free catalogue describes a pre-cooling structure for the air-cooled package. Its purpose is to lower the compressed-air temperature before the air reaches the aluminium-fin heat exchanger, supporting the downstream cooling task. This is one reason the air-cooled arrangement should be reviewed as a connected thermal system rather than a cabinet with a fan added to it.
For the selected machine, the relevant cooling circuits and their maintenance access belong in the installation discussion. Keep the heat-exchange arrangement, cooling-air route and surrounding room conditions on the same drawing. A clear system description helps the plant understand which parts of the cooling task are within the package and which depend on the room installation.
An intake opening can be physically large yet poorly located if it draws heated air from another machine or from the compressor's own discharge route. Conversely, a useful intake route cannot compensate for a discharge path that traps heat in the room. Review both sides of the airflow arrangement during normal production.
Show nearby machinery, walls, openings and proposed ducts on the room plan. Include any operating condition in which doors are closed or neighbouring equipment changes state. This makes the review specific to the actual installation and helps the supplier identify information needed for the offered package, rather than relying on a general statement that the room is well ventilated.
Where hot air will be ducted away, coordinate the arrangement with the selected machine's installation requirements before duct fabrication. The route, transitions and connection details affect how the package and room ventilation work together. Keep service access visible during the same review, because a duct can obstruct panels or component-removal routes if the disciplines are considered separately.
Provide the supplier with the proposed duct arrangement and any constraints imposed by the building. Ask for the applicable requirements for the offered configuration. That creates a useful division between package information and the contractor's installation design, while allowing conflicts to be resolved before the equipment is placed in the room.
The package cooling arrangement and downstream air treatment perform different tasks. As compressed air cools, moisture management remains relevant to the delivered-air system. Select the dryer, drains and any filtration from the conditions required at the process connection, including the applicable flow and pressure.
An Air-Cooled Fixed-Speed Dry Type Oil-Free Screw Air Compressor should therefore be specified with its downstream interfaces in view. State where the required air condition must be achieved and identify any treatment equipment that is retained from an existing installation. This helps prevent the compression technology from being mistaken for a complete specification of particles, moisture and oil at every point in the factory.
The catalogue describes an independent lubrication arrangement serving the relevant mechanical components of the dry oil-free package. Lubrication supports those components while the dry compression process remains a separate function. This is an important operating distinction for teams moving from another compressor technology.
During procurement, obtain the applicable operating and maintenance documents for the supplied configuration. These should guide the plant's servicing tasks, consumables and observations. Avoid extending an oil-free air requirement into an assumption that lubricant checks or maintenance access are unnecessary. The package should be treated as a complete machine with several coordinated systems.
The dry oil-free catalogue includes a gearbox-breather and venting arrangement alongside the lubrication discussion. This supports pressure management within the relevant mechanical-system enclosure. It is a different function from supplying production air or removing water from the compressed-air network.
Preserve access to the relevant service points and follow the instructions for the actual machine. If the plant reports a lubrication-related observation, identify the displayed event, component and operating condition rather than describing it as an air-quality result. Clear distinctions between system functions make maintenance communication more useful and reduce the risk of applying the wrong remedy to an unrelated symptom.
An air-cooled installation needs a practical way to inspect and maintain the relevant cooling surfaces in accordance with the supplied instructions. The plant should consider how dust, nearby processes and access restrictions affect the maintenance task. The layout must allow the intended work without dismantling unrelated production equipment.
Coordinate the compressor with receivers, treatment equipment, cable trays and pipework on a single plan. Check both routine service and the route needed for larger component work. A layout that leaves only enough space to stand beside the cabinet may still be unsuitable for the tasks the plant will need to perform during the machine's operating life.
Record the machine identification and relevant component references before ordering consumables or replacement parts. The family name, cooling arrangement and electrical configuration should remain consistent with the actual supplied package. A general description of an oil-free compressor is less useful than the applicable parts information.
Keep maintenance records with the equipment, including the operating condition and the task completed. If a symptom appears after servicing or an installation change, that history helps the service team identify what changed. It also gives the plant a practical basis for planning the next service activity around production and reserve-air availability.
A fixed-speed compressor can serve a sustained portion of a plant's demand while another machine handles variation, provided the station arrangement supports that division. Alternatively, it may supply a dedicated process with a repeatable load. Describe the intended role in the enquiry so the selected capacity and operating sequence can be reviewed together.
Identify normal production, reduced production and planned maintenance states. Record which users remain active and which other supplies are available in each state. This is more useful than choosing a motor rating from the busiest production period alone and leaving the plant to decide later how the machine should operate for the rest of the schedule.
The receiver affects storage and pressure response, while the compressor provides sustained air delivery and treatment manages the specified air condition. These functions belong in one system review. A vessel does not increase the compressor's continuous delivery capability, and an adequate compressor does not resolve an incorrectly selected treatment or distribution path.
For an existing station, identify the receiver and treatment equipment that will remain connected. For a new station, state the desired scope and the process requirements before equipment sizes are finalised. Keep the flow basis, working pressure and relevant interfaces consistent so the proposed arrangement describes an air supply that can work as a whole.
The required pressure belongs at the process connection during the operating condition that matters to production. Between that connection and the compressor may sit treatment equipment, valves, pipework and local regulators. Their effect is best understood while air is flowing through the route.
Observe package pressure and the relevant user pressure during the same production event. If the package pressure holds while the user pressure falls, the distribution and treatment route deserve attention. If both change with a sustained additional demand, the station capacity and operating sequence may need review. This distinction helps keep a new compressor purchase connected to the actual cause of the production complaint.
When production must continue during compressor maintenance, identify the essential users and the duty they require. Then confirm how the alternative source reaches them, which equipment is isolated and how the operating sequence changes. A reserve unit's nameplate rating alone does not describe a usable continuity plan.
Keep the normal operating case and maintenance case separate in the proposal. State whether a temporary interruption is acceptable and which parts of the process may stop. This gives engineering a clear basis for the reserve arrangement and lets purchasing compare offers that address the same production requirement.
A scope schedule should identify the compressor package, electrical connection, cooling-air interfaces, receiver, treatment, controls and installation documents. Assign each item to the responsible supplier or plant contractor. This is especially valuable when a compressor is ordered separately from the room ventilation or downstream equipment.
Review the schedule before comparing final prices. A lower price may represent a different supplied boundary rather than an equivalent system. A clear schedule also helps the installation team coordinate deliveries and design work, allowing the equipment to enter service with the required connections and documentation already understood.
| Interface | Define in the offer | Coordinate with |
|---|---|---|
| Compressor and room cooling | Selected cooling entry, intake and discharge requirements | Room layout and ventilation design |
| Electrical supply | Voltage, frequency, phase and package documents | Site electrical installation |
| Air storage and treatment | Required flow, pressure and delivered-air condition | Receiver, dryer, drains and distribution |
| Station operation | Normal duty, reduced production and reserve case | Other machines and station controls |
| Installation and acceptance | Connections, access, drawings and agreed records | Plant contractor and technical review |
Use the final offered configuration and approved handling instructions when planning delivery and placement. The published air-cooled dimensions and weight help establish the shortlist, but the delivery team should work from the information for the machine actually being supplied. Check doors, corners, floor transitions and space for handling equipment along the full route.
The final room position should allow access to the operating interface, service points and connecting utilities. Review the route for future component removal as well as initial installation. These practical checks let the plant resolve access problems before the machine arrives, when changes are generally easier to coordinate with the building and production teams.
The catalogue lists standard supply as 380 V / 50 Hz / three-phase and notes the availability of other voltages. Provide the destination voltage, frequency and phase in the enquiry, and require the offered electrical configuration to state the agreed supply. Do not treat the standard catalogue entry as confirmation of a different destination configuration.
The installation design also needs the applicable machine electrical documents and connection requirements. The motor kW field alone does not establish every cable, switching or protective-device requirement. Coordinate the final electrical scope with the site's responsible personnel and the supplied package documentation before connection and commissioning.
Commissioning should follow the supplied machine instructions and authorised scope of work. Confirm the delivered configuration, installed connections and intended station role. Then observe the relevant supply behaviour during a production state that reflects the duty used for selection, rather than relying only on a reading while the factory is idle.
Record the operating users, package state, relevant pressure observations and treatment equipment in service. Include the room cooling arrangement used during the observation. This gives the plant a baseline that can be understood later, helping distinguish a new production demand or room alteration from a change within the compressor package.
A temperature or pressure value becomes more useful when its measurement point and operating condition are known. Record where the value was observed, the machine's displayed state and what production was doing at the time. Include recent maintenance or installation changes that may help explain an event.
Use the same observation points when investigating a later complaint. That makes comparisons meaningful and gives authorised service personnel a clearer starting point. A sequence of readings taken under unrelated conditions is less useful than a concise record showing how the package, room cooling and process demand behaved during the same operating event.
| Observation | Record together | Question to resolve |
|---|---|---|
| User pressure falls while package pressure holds | Readings across treatment and the affected branch under the same demand | Where does pressure diverge during flow? |
| Package pressure changes during a production campaign | Simultaneous users, machine state and event duration | Has the sustained demand or duty allocation changed? |
| Cooling indication follows a room change | Displayed event, intake route and hot-air discharge path | Has obstruction or recirculation changed? |
| Maintenance-related observation | Machine identification, recent service and actual operating condition | Which system and change should authorised service review? |
Official SEIZE AIR dry oil-free product-family introduction.
SEIZE AIR is the brand of Seize Compressor (Shanghai) Co., Ltd., founded in 2009 and based in Shanghai. As a compressor manufacturer in China, the company combines product development, manufacturing, marketing and service in its offering. For a buyer, the practical value lies in connecting that background to a defined machine configuration and the documents needed for installation and operation.
Ask for the selected pressure, airflow, cooling arrangement and electrical supply to remain consistent throughout the proposal. The supporting information should describe the same package that appears on the equipment schedule. That gives the engineering review a concrete product to assess and purchasing a clear description of the order scope.
An Air-Cooled Fixed-Speed Dry Type Oil-Free Screw Air Compressor proposal should identify both the package duty and the room interfaces. Compare it with an alternative on the same delivered-air requirement, production pattern and supplied boundary. Include the cooling-service and installation work that each option requires.
Where energy performance forms part of the review, obtain the relevant package-input information for the operating points being compared. Motor rating, catalogue capacity and actual package input serve different purposes. Keeping those fields separate helps the plant evaluate a real operating proposal without treating a general technology description as a site-specific performance result.
Include the documents and acceptance requirements needed for your project in the technical and commercial discussion. The selected model family, pressure configuration, air-cooling entry, electrical supply and included equipment should be traceable through the relevant order information.
The catalogue's ISO 1217 Annex C reference establishes the stated basis of its free-air-delivery figures. The inspection and acceptance arrangement for a particular order should identify the applicable procedure and records. This allows the buyer to review the delivered equipment against the agreed configuration and scope, rather than relying only on the appearance of the cabinet or a general company statement.
Send the required process pressure and simultaneous airflow, production schedule, destination electrical supply and available room layout. Identify the receiver and treatment equipment already installed, the preferred cooling arrangement and any reserve-duty requirements. Include the required documents and any constraints affecting delivery or placement.
Ask the factory to identify included items, optional equipment and installation responsibilities in a consistent format. This makes supplier comparison more useful and gives the plant contractor a clear starting point. It also reduces the number of unresolved questions that would otherwise appear after purchasing has approved a cabinet price without the complete air-system context.
No. The cooling arrangement depends on a suitable air path and heat rejection from the installation. The room layout must account for intake air, discharged hot air, nearby heat sources and possible recirculation. Review the proposed arrangement with the requirements for the selected package.
If ducting is planned, coordinate it before fabrication and preserve service access on the same drawing. Air cooling changes the utility arrangement; it does not remove the need to design the installation around the heat that the compressor package must reject during operation.
Use the mechanical schedule for the selected cooling arrangement. The catalogue lists different dimensions, weights and, in some rows, outlet connections for air-cooled and water-cooled packages. These differences affect the final connection and handling plans.
For example, the SWT-75A/W air-cooling entry uses DN50 while its water-cooling entry uses DN80. Keep the offered cooling choice on the equipment schedule and obtain its final arrangement drawing before ordering connecting pipework or completing the room layout.
No. The compression process and moisture control are separate tasks. Identify the required delivered-air condition at the relevant process connection, then select drying, drains and other treatment for the operating flow, pressure and installation conditions.
Where existing treatment remains in use, include it in the review. Its capacity and pressure-loss characteristics matter to the complete supply. The objective is a coordinated system in which compression, storage, treatment and distribution each support the process requirement they are intended to serve.
Provide the production-air requirement and proposed installation information, then ask SEIZE AIR to relate the selected model and cooling arrangement to that duty. Include the normal operating case, reduced-demand states and any maintenance reserve requirement so the package has an understandable role throughout the production schedule.
With that information, the Air-Cooled Fixed-Speed Dry Type Oil-Free Screw Air Compressor offer can connect capacity, cabinet dimensions, room cooling and supplied interfaces in one reviewable proposal. Engineering can assess the installation while purchasing compares a clearly defined package that reflects how the plant intends to use it.
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