Carbon Dioxide Compressor

Carbon Dioxide Compressor

Carbon dioxide compressor — Series A 1.2–10.0 MPa, 2–200 m³/min; Series B 0.10–1.0 MPa, 2–600 m³/min. 56 models, 45–3000 kW. Food-grade, oil-free, urea, EOR, supercritical CO₂.

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Carbon Dioxide Compressor — Medium/High-Pressure and Low-Pressure Two-Series

Reciprocating Piston CO₂ Compressor for Industrial Gas Processing · Medium/High-Pressure 1.2–10.0 MPa, 2–200 m³/min · Low-Pressure 0.10–1.0 MPa, 2–600 m³/min · 45–3000 kW

The carbon dioxide compressor is a purpose-built reciprocating piston compression system engineered for the specific physical and chemical properties of CO₂ gas in food-grade carbonation, industrial gas recovery, supercritical CO₂ extraction, enhanced oil recovery (EOR), urea synthesis, and carbon capture applications. Unlike general air compressors, CO₂ compressors use sealed gas-tight construction, CO₂-resistant piston ring materials, oil-free or lubricated configurations matched to gas purity requirements, and pressure vessel standards appropriate for handling compressed carbon dioxide safely.

This two-series range covers the complete spectrum of industrial CO₂ compression needs. Series A — Medium/High-Pressure CO₂ Compressor covers 30 standard models from 2 m³/min to 200 m³/min at discharge pressures of 1.2 to 10.0 MPa, in twin-column three-stage, twin-column four-stage, and four-column four-stage configurations. Series B — Low-Pressure CO₂ Compressor covers 26 standard models from 2 m³/min to 600 m³/min at discharge pressures of 0.10 to 1.0 MPa, in twin-column single-stage and two-stage configurations. Drive power spans 45 kW to 3,000 kW with voltage options of 380 V, 6 kV, and 10 kV. Custom single-unit capacity within 11 kW to 3,000 kW available on request across both series.

All models are designed for continuous-duty CO₂ service with gas-tight shaft sealing, CO₂-compatible lubricants or PTFE oil-free rings, inter-stage cooling optimised for CO₂ thermodynamic properties, and material selection to resist carbonic acid corrosion. Proven in food and beverage carbonation plants, brewery CO₂ recovery systems, fertilizer urea synthesis, supercritical CO₂ extraction facilities, and industrial carbon capture installations.

Carbon dioxide compressor collection — medium high-pressure and low-pressure CO2 reciprocating piston compressor series for food carbonation, industrial gas recovery, supercritical extraction, urea synthesis, and EOR applications
CO₂ compressor series — medium/high-pressure models (1.2–10.0 MPa) and low-pressure models (0.10–1.0 MPa) for complete industrial carbon dioxide compression requirements
CO₂ Dedicated Design
Med/High: 1.2–10.0 MPa
Low: 0.10–1.0 MPa
2–600 m³/min
56 Standard Models
45–3000 kW
380 V / 6 kV / 10 kV
Oil-Free and Lubricated

Typical applications: Food and beverage carbonation and CO₂ filling · Brewery CO₂ fermentation gas recovery · Beverage plant CO₂ storage and transfer · Urea and chemical fertilizer synthesis (CO₂ plus ammonia) · Supercritical CO₂ extraction (hop, coffee, herbal, oil) · Enhanced oil recovery (EOR) CO₂ injection · Carbon capture and geological storage (CCS) · Dry ice production · Fire suppression system CO₂ charging · Pharmaceutical CO₂ processing · Low-temperature refrigeration plant CO₂ booster

Series A — Medium/High-Pressure Carbon Dioxide Compressor

For Medium and High-Pressure CO₂ Process Applications · Discharge Pressure 1.2–10.0 MPa · Flow 2–200 m³/min

Series A covers three mechanical configurations: twin-column three-stage (ZW, LW, DW series), twin-column four-stage (DW/40 series with 4.0 MPa rating), and four-column four-stage (4MW series). Model designation: number before slash = flow in m³/min; number after slash = pressure in bar (e.g. DW-30/30 = 30 m³/min at 3.0 MPa). Where two pressure ratings appear (e.g. 4.00/3.00), the compressor frame supports both pressure options. Custom design up to 3,000 kW available.

No. Model Pattern Flow (m³/min) Pressure (MPa) Dimensions L×W×H (mm) Weight (t) Power (kW) Voltage (V)
1 ZW-2/60 Modular Twin-col. 3-stage 2 6.00 1550×1710×1520 2.90 45 380
2 ZW-4/25 Modular Twin-col. 3-stage 4 2.50 1920×1900×2580 3.97 55 380
3 ZW-5.5/24 Three-col. 3-stage 5.5 2.40 1889×1900×2720 3.50 75 380
4 LW-6/18 Twin-col. two-stage 6 1.80 2050×910×2070 1.80 65 380
5 LW-8/18 Twin-col. two-stage 8 1.80 2014×910×2006 1.80 75 380
6 LW-10/18 Twin-col. two-stage 10 1.80 2632×1550×2332 3.00 110 380
7 LW-16/30 Twin-col. 3-stage 16 3.00 3500×2600×1850 6.00 220 380
8 LW-20/30 Twin-col. 3-stage 20 3.00 3500×2600×1850 6.00 240 (250) 380/6K/10K
9 LW-20/36 Modular Twin-col. 3-stage 20 3.60 4000×3100×2800 9.50 250 380/6K/10K
10 LW-25/30 Twin-col. 3-stage 25 3.00 2960×1685×2335 6.50 280 380/6K/10K
11 DW-25/30 Twin-col. 3-stage 25 3.00 5600×1800×1980 6.00 280 380/6K/10K
12 DW-25/40(30) Twin-col. 4-stage 25 4.00 (3.00) 5930×1450×1800 6.00 315 (280) 380/6K/10K
13 DW-30/30 Twin-col. 3-stage 30 3.00 5600×1800×1980 6.00 355 380/6K/10K
14 DW-30/40(30) Twin-col. 4-stage 30 4.00 (3.00) 6645×3225×2330 11.00 400 (355) 6K/10K
15 DW-32/30 Twin-col. 3-stage 32 3.00 5600×1800×1980 6.00 400 6K/10K
16 DW-35/30 Twin-col. 3-stage 35 3.00 6645×3225×2330 11.00 400 6K/10K
17 DW-35/40(30) Twin-col. 4-stage 35 4.00 (3.00) 6585×3590×2095 13.00 450 (400) 6K/10K
18 DW-40/40(30) Twin-col. 4-stage 40 4.00 (3.00) 6585×3600×2100 13.00 500 6K/10K
19 DW-44/25 Twin-col. 3-stage 44 2.50 6100×1700×3300 11.00 450 6K/10K
20 DW-46/30 Twin-col. 3-stage 46 3.00 6100×1700×3300 11.50 550 6K/10K
21 DW-46/40(30) Twin-col. 4-stage 46 4.00 (3.00) 6585×3600×2100 13.00 600 (550) 6K/10K
22 DW-50/25 Twin-col. 3-stage 50 2.50 6100×1700×3300 11.00 500 6K/10K
23 DW-50/40(30) Twin-col. 4-stage 50 4.00 (3.00) 6585×3600×2100 13.00 600 (550) 6K/10K
24 DW-60/40(30) Twin-col. 4-stage 60 4.00 (3.00) 8500×4400×3020 17.00 710 (650) 6K/10K
25 DW-70/40(30) Twin-col. 4-stage 70 4.00 (3.00) 8500×2440×3020 18.00 850 6K/10K
26 4MW-85/40(30) Four-col. 4-stage 85 4.00 (3.00) 6400×3300×2800 26.00 1000 6K/10K
27 4MW-90/40(30) Four-col. 4-stage 90 4.00 (3.00) 6400×3300×2800 26.00 1050 6K/10K
28 4MW-100/40(30) Four-col. 4-stage 100 4.00 (3.00) 6400×3300×2800 26.50 1100 6K/10K
29 4MW-120/40(30) Four-col. 4-stage 120 4.00 (3.00) 6800×3900×3200 28.50 1250 6K/10K
30 4MW-150/40(30) Four-col. 4-stage 150 4.00 (3.00) 8500×3900×3200 30.00 1700 6K/10K

Note: Custom CO₂ compressor and CO₂ booster compressor designs within 11 kW to 3,000 kW available on request. “(30)” indicates 3.0 MPa optional pressure rating on the same frame. Power values in parentheses apply to the lower pressure option.

Series B — Low-Pressure Carbon Dioxide Compressor

For Low-Pressure CO₂ Process Applications · Discharge Pressure 0.10–1.0 MPa · Flow 2–600 m³/min

Series B covers twin-column single-stage and two-stage configurations for CO₂ recovery, transfer, and low-pressure process supply. Typical uses include brewery and fermentation CO₂ collection at near-atmospheric pressure, CO₂ purification column feed, refrigeration booster service, and low-pressure CO₂ injection. All 26 models use CO₂-grade sealing materials and gas-tight construction. Custom capacity up to 3,000 kW available on request.

No. Model Pattern Flow (m³/min) Pressure (MPa) Dimensions L×W×H (mm) Weight (t) Power (kW) Voltage (V)
1 ZW-6/8 Twin-col. two-stage 6 0.80 2250×1296×2350 2.00 45 380
2 LW-10/8 Twin-col. two-stage 10 0.80 2340×910×2070 1.80 110 380
3 LW-20/2 Twin-col. single-stage 20 0.20 2632×1550×2332 1.80 75 380
4 LW-20/8 Twin-col. two-stage 20 0.80 2630×1550×2332 3.00 132 380
5 LW-30/4 Twin-col. two-stage 30 0.40 2975×1550×2370 3.40 132 380
6 LW-40/2.5 Twin-col. single-stage 40 0.25 2980×1550×2650 3.40 160 380
7 LW-40/4 Twin-col. two-stage 40 0.40 2965×1550×2370 3.40 160 380
8 LW-50/5 Twin-col. two-stage 50 0.50 2360×1685×2235 6.50 240 (250) 380/6K/10K
9 LW-60/2.5 Twin-col. single-stage 60 0.25 2995×1600×2170 4.82 200 380/6K/10K
10 LW-60/4 Twin-col. two-stage 60 0.40 2995×1600×2170 4.82 240 (250) 380/6K/10K
11 DW-60/6 Twin-col. two-stage 60 0.60 5000×1450×1800 6.00 350 380/6K/10K
12 DW-68/4 Twin-col. two-stage 68 0.40 5100×1450×3200 6.80 315 380/6K/10K
13 DW-100/6 Twin-col. two-stage 100 0.60 5600×1700×2660 13.00 550 6K/10K
14 DW-116/6 Twin-col. two-stage 116 0.60 5600×3540×2550 13.00 630 6K/10K
15 D-120/4 Twin-col. single-stage 120 0.40 5370×1700×2535 13.50 630 6K/10K
16 DW-120/4 Twin-col. two-stage 120 0.40 5560×3540×2260 13.00 550 6K/10K
17 DW-130/4 Twin-col. two-stage 130 0.40 5600×3540×2660 13.50 630 6K/10K
18 DW-150/4 Twin-col. two-stage 150 0.40 6000×3640×3000 18.00 710 6K/10K
19 DW-190/2.5 Twin-col. single-stage 190 0.25 6250×2100×2735 15.00 650 6K/10K
20 DW-290/2 Twin-col. single-stage 290 0.20 6500×3800×2535 17.00 1000 6K/10K
21 DW-300/1 Twin-col. single-stage 300 0.10 6200×3640×2860 14.00 550 6K/10K
22 DW-325/2 Twin-col. single-stage 325 0.20 6500×3800×2535 18.00 1100 6K/10K
23 4MW-180/6.5 Four-col. two-stage 180 0.65 6250×3905×3020 26.00 1000 6K/10K
24 4MW-240/6.5 Four-col. two-stage 240 0.65 6250×3905×3020 26.00 1300 6K/10K
25 HW-380/2.5 Four-col. single-stage 380 0.25 6250×7900×2735 28.00 1300 6K/10K
26 HW-600/1 Four-col. single-stage 600 0.10 6200×8500×2860 30.00 1100 6K/10K

Note: Custom CO₂ compressor designs within 11 kW to 3,000 kW available on request for Series B. All Series B models are available in both lubricated and oil-free PTFE piston ring configurations depending on CO₂ purity requirements.

Why CO₂ Compression Requires Dedicated Equipment

CO₂ Physical Properties That Drive Equipment Design

Carbon dioxide has a critical point of 31.1 deg C and 7.38 MPa. When compressed and cooled in the supercritical or near-critical range, CO₂ undergoes large changes in density and can partially liquefy in inter-stage coolers if temperature control is inadequate. Standard air compressor inter-stage coolers are not designed for CO₂ condensation, and liquid CO₂ entering a compression cylinder causes catastrophic mechanical damage. CO₂ compressors use inter-stage separators with liquid level monitoring, higher cooling water temperatures on the LP inter-stage to prevent condensation, and CO₂-specific valve sizing that accounts for the higher molecular weight and different isentropic exponent of CO₂ versus air.

CO₂ in the presence of moisture forms carbonic acid (H₂CO₃), which is corrosive to carbon steel piston rods, cylinder bores, and valve seats. CO₂ compressor wetted parts use corrosion-resistant materials — stainless steel piston rods, special alloy valve plates, PTFE or FKM seals, and corrosion-resistant cylinder bore coatings — to withstand continuous service in wet CO₂ service without accelerated wear. Gas-tight shaft sealing with leakage collection is standard on CO₂ compressors to prevent greenhouse gas emissions and maintain process purity, unlike open-vented air compressor crankcase designs.

Series A — Multi-Stage Compression to Medium and High Pressure

Reaching 3.0 to 4.0 MPa for CO₂ liquid storage charging, urea synthesis column feed, or supercritical extraction requires three or four compression stages with inter-stage cooling and liquid separation between each stage. The twin-column three-stage configuration handles the 1.2 to 3.0 MPa range efficiently for medium-scale applications. The twin-column four-stage and four-column four-stage configurations extend the range to 4.0 MPa for large-scale industrial CO₂ compression — including beverage-grade CO₂ high-pressure storage, chemical synthesis feed, and EOR injection — where sustained high-pressure delivery with low specific energy consumption is critical.

Series B — Recovery and Transfer at Low Pressure

Brewery CO₂ fermentation gas is produced at near-atmospheric pressure (0.01 to 0.05 MPa above atmospheric). Recovering this CO₂ for purification and re-use in carbonation requires a first-stage compressor to raise the gas from near-atmospheric to a pressure suitable for storage, purification, or further compression — typically 0.4 to 0.8 MPa for CO₂ purification column feed or 0.1 to 0.25 MPa for gas transfer and buffer storage. Series B low-pressure CO₂ compressors cover this first-stage recovery function with single-stage and two-stage configurations matched to the actual pressure requirements, achieving high volumetric efficiency at the low pressure ratios of CO₂ recovery service.

5 Core Advantages of This Carbon Dioxide Compressor Series

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Purpose-Built for CO₂ Gas Properties

Every design detail is matched to the physical and chemical behaviour of CO₂ under compression — inter-stage separation to handle near-critical phase changes, corrosion-resistant wetted materials for wet CO₂ service, gas-tight shaft sealing to prevent leakage, and valve sizing calibrated for CO₂ molecular weight and isentropic exponent. These are not air compressors adapted for CO₂ use — they are CO₂-native designs that reliably handle gas that would rapidly damage a standard air compressor.

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Complete Pressure Coverage — 0.10 to 10.0 MPa

From brewery gas recovery at 0.10 MPa through refrigeration booster at 0.4 to 1.0 MPa to liquid CO₂ storage charging at 2.5 to 4.0 MPa and supercritical extraction at 8.0 to 10.0 MPa, this two-series range covers every industrial CO₂ compression requirement in a unified product family with common spare parts philosophy and consistent technical support.

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Food-Grade and Oil-Free Options

For food-grade CO₂ applications — carbonated beverage production, dry ice manufacture, and food packaging atmosphere flushing — Series B and Series A models are available in oil-free PTFE piston ring configuration with food-grade gas path materials, delivering CO₂ free of hydrocarbon contamination to meet beverage industry and food safety standards. The oil-free option uses the same distance piece isolation and PTFE ring technology as our fermentation and PET bottle blowing compressors.

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Large Single-Unit Capacity for Industrial Scale

With four-column four-stage Series A models reaching 150 m³/min at 4.0 MPa (1,700 kW) and four-column Series B models handling 600 m³/min at 0.10 MPa (1,100 kW), this series covers the largest industrial CO₂ compression applications including large-scale urea plant CO₂ feed, EOR CO₂ injection stations, and major carbon capture facilities, with single units of the scale required to match industrial plant throughputs.

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Field-Serviceable in Process Plant Environment

Piston rings, valve assemblies, shaft seals, and inter-stage gaskets are all field-replaceable during planned maintenance shutdowns by plant maintenance teams. The open crankcase design allows visual inspection of internal components without major disassembly. For process plants operating continuous CO₂ service, the ability to perform maintenance within planned turnaround windows without specialist contractors significantly reduces total cost of ownership versus diaphragm or centrifugal CO₂ compressor alternatives.

Typical Application Scenarios

Carbon dioxide compressor application scenarios — food carbonation, brewery CO2 recovery, supercritical extraction, urea synthesis, EOR injection, CCS carbon capture, dry ice production
CO₂ compressor application scenarios — food and beverage carbonation, brewery gas recovery, supercritical extraction, chemical synthesis, EOR, and carbon capture applications

Food and Beverage CO₂ Carbonation

Carbonated soft drinks, beer, sparkling water, and cider all require food-grade CO₂ dissolved into the beverage under pressure. CO₂ is stored as a liquid in high-pressure tanks at 1.5 to 2.0 MPa and dispensed as gas to the carbonation mixer. The medium-pressure Series A models (LW-6/18 to DW-46/30, 1.8 to 3.0 MPa) serve the CO₂ liquefaction and transfer compression step in beverage CO₂ supply systems. Oil-free piston ring configuration is mandatory for food-grade CO₂ compression.

Series A: LW-6/18 to DW-46/30 (oil-free)

Brewery CO₂ Recovery

Beer fermentation produces large quantities of CO₂ gas at near-atmospheric pressure that can be captured, purified, and recycled for use in cellar gas (tank blanketing), packaging line flushing, and carbonation topping. A medium-scale brewery producing 500,000 hl per year generates approximately 15 to 25 m³/min of recoverable CO₂ from fermenting vessels. Series B low-pressure models (LW-20/2 to LW-60/4, 0.20 to 0.40 MPa) collect fermentation CO₂ and feed it to the purification skid, while a Series A unit provides the high-pressure compression stage for liquid CO₂ storage charging.

Series B: LW-20/2 to LW-60/4 | Series A: ZW-4/25 to LW-25/30

Supercritical CO₂ Extraction

Supercritical CO₂ extraction is used to produce hop extract for brewing, coffee decaffeination, herbal and botanical extracts, and edible oil refining. The process requires CO₂ compressed to supercritical conditions above 7.38 MPa — in practice, extraction vessels typically operate at 15 to 30 MPa. The Series A high-pressure models are the compression stage in a supercritical extraction plant, feeding CO₂ from liquid storage into the extraction autoclave via additional boosting stages. Custom designs within the 11 kW to 3,000 kW range can be engineered for specific supercritical extraction pressures and flow rates.

Series A: ZW-2/60 and above (custom HP stages available)

Urea Synthesis CO₂ Feed

Urea production from ammonia and CO₂ at 14 to 18 MPa requires large quantities of compressed CO₂ at the synthesis column inlet pressure. The CO₂ arrives from ammonia plant recovery at near-atmospheric pressure and must be compressed in multiple stages to synthesis pressure. Series A four-stage models from DW-40/40 through 4MW-150/40(30) cover the first compression stages of urea plant CO₂ trains, with custom high-pressure booster stages engineered for final compression to synthesis column feed pressure. Large urea plants processing 1,000 to 2,000 tonnes per day use multiple parallel Series A units.

Series A: DW-40/40 to 4MW-150/40 + custom HP boosters

Carbon Capture and EOR

Enhanced oil recovery (EOR) injects CO₂ into oil reservoirs at 10 to 25 MPa to mobilise residual oil and improve extraction rates. Carbon capture and storage (CCS) facilities compress captured CO₂ for geological injection at similar pressures. Both applications require large-capacity CO₂ compression at high pressure with high reliability — a compressor failure on an EOR or CCS injection station means significant lost production or storage capacity. The large 4MW series four-column models provide the high-capacity, high-reliability base stage compression for EOR and CCS applications, with custom boosting stages for final injection pressure.

Series A: 4MW-85 to 4MW-150 + custom HP boosters

Dry Ice Production and Industrial CO₂

Dry ice production requires liquid CO₂ at approximately 5.5 MPa saturated at minus 20 deg C, which is allowed to expand through a throttle into dry ice snow. Large CO₂ supply plants serving industrial dry ice manufacturers, fire suppression system installers, and laboratory supply companies compress recovered CO₂ to 2.5 to 4.0 MPa for liquid storage and tanker filling. The LW-16/30 through DW-70/40 series covers the typical capacity range of industrial CO₂ liquefaction compressors for dry ice supply and cylinder filling operations.

Series A: LW-16/30 to DW-70/40(30)

How to Specify a CO₂ Compressor — Key Selection Criteria

1

Determine Inlet and Discharge Pressure

CO₂ compressor inlet pressure varies significantly by application — brewery recovery typically operates at 0.02 to 0.05 MPa above atmospheric, while CO₂ from ethanol plants may arrive at 0.1 to 0.3 MPa. The discharge pressure is determined by the downstream process: liquid CO₂ storage at 2.0 to 2.5 MPa, urea synthesis feed at 14 to 18 MPa (via additional boosting stages), supercritical extraction at 15 to 30 MPa (via additional stages), or low-pressure transfer at 0.4 to 0.8 MPa. Define both inlet and discharge pressures precisely before choosing which series and model to specify.

2

Specify CO₂ Gas Purity Requirements

Food-grade CO₂ for carbonation must meet strict purity standards (typically 99.9% minimum CO₂, maximum 0.1 ppm oil). This requires oil-free PTFE piston ring configuration with food-grade seals and stainless-steel gas path components. Industrial CO₂ for EOR, urea synthesis, or refrigeration booster service may tolerate a small residual oil content from a lubricated compressor, provided the process is not sensitive to hydrocarbon contamination. Specify the purity class required and whether food-grade or industrial-grade compressor configuration is needed.

3

Account for CO₂ Near-Critical Behaviour

When compressing CO₂ above approximately 2.0 MPa, inter-stage temperatures must be managed carefully to prevent condensation in the inter-stage cooler. Our CO₂ compressor designs include inter-stage liquid separators with level monitoring and automatic drainage, and the inter-stage cooling temperature set points are specified to maintain CO₂ above its condensation point at each inter-stage pressure. These process details must be discussed with our application engineering team during the specification stage, along with cooling water temperature and CO₂ inlet moisture content.

4

Plan Shaft Sealing and Emission Control

CO₂ is a greenhouse gas with a Global Warming Potential of 1.0 — shaft seal leakage must be minimised and captured. All CO₂ compressors in this series use gas-tight shaft sealing with leakage collection rather than open atmospheric venting. The collected leakage can be routed back to the compressor inlet or to a low-pressure recovery system. For plants subject to greenhouse gas emissions reporting, shaft seal leakage collection with routing to a flare or recovery system is required. Our application engineers can specify the appropriate sealing and leakage management system for each installation.

Frequently Asked Questions — Carbon Dioxide Compressor

1. Can a standard air compressor be used to compress CO₂?

No. Standard air compressors are not suitable for CO₂ compression for several reasons. CO₂ near its critical point undergoes phase changes that can cause liquid CO₂ to form in inter-stage coolers, potentially entering cylinders and causing immediate mechanical failure — standard air compressor inter-stage designs have no provision for liquid separation. CO₂ forms carbonic acid with moisture, rapidly corroding the carbon steel components used in standard air compressors. Standard air compressor shaft seals are not gas-tight and would release CO₂ to atmosphere rather than containing it. Air compressor valves and piston rings are not sized or made from materials appropriate for CO₂ gas properties. A dedicated CO₂ compressor must be used for any CO₂ compression application.

2. What is the difference between Series A and Series B in terms of application?

Series A (1.2 to 10.0 MPa) is used wherever CO₂ needs to be compressed to medium or high pressure — for liquid CO₂ storage and tanker filling (2.0 to 2.5 MPa), supercritical extraction (above 7.38 MPa), urea synthesis feed (via cascaded stages), EOR injection, or high-pressure gas transfer and distribution. Series B (0.10 to 1.0 MPa) is used for CO₂ recovery from near-atmospheric sources (fermentation off-gas, stack gas capture), CO₂ purification column feed, refrigeration system booster compression, and low-pressure CO₂ transfer between vessels. Many CO₂ plants use both series in cascade — Series B for initial recovery and first-stage compression, feeding into a Series A unit for final compression to storage or process pressure.

3. What does the “(30)” suffix in Series A model names mean?

The “(30)” suffix — for example in DW-30/40(30) — means the same compressor frame is available in either 4.0 MPa or 3.0 MPa discharge pressure configuration. Because CO₂ processes vary in required discharge pressure, offering both pressure ratings on the same mechanical frame reduces manufacturing cost and provides the buyer flexibility to specify the appropriate pressure rating for their process without needing a completely different model. The power figure in parentheses (e.g. 400/355) gives the motor power for each pressure option. At 3.0 MPa the compression ratio is lower, so the required motor power is reduced. Our technical team can advise on which pressure rating is appropriate for a specific CO₂ application during specification.

4. What cooling water specification is required for CO₂ compressors?

CO₂ compressors have more specific cooling water requirements than air compressors because of the need to manage CO₂ condensation risk in inter-stage coolers. Cooling water inlet temperature must be controlled within 20 to 35 deg C for LP inter-stage coolers and may need to be maintained at a higher minimum temperature for intermediate-stage coolers on high-pressure models to prevent CO₂ from condensing in the cooler tubes. Cooling water quality requirements are standard industrial water specifications: pH 7.0 to 8.5, hardness below 150 mg/L as CaCO₃, and no suspended solids above 50 microns. A closed-circuit cooling tower system with chemical inhibitor dosing is strongly recommended to maintain consistent water quality and temperature in all seasons.

5. What warranty and spare parts support are provided?

Standard 12-month warranty from commissioning covers manufacturing defects in materials and workmanship. A commissioning spare parts set — piston rings, valve plates and springs, inter-stage gaskets, shaft seal assemblies, and filter elements — is recommended with each unit order. CO₂ compressor installations in process plants where a compressor failure stops downstream production should maintain a site spare parts inventory of at least one complete valve set per stage and one piston ring set per stage. For remote site installations or plants in countries with long import lead times, our logistics team can arrange annual spare parts supply agreements to maintain on-site inventory at appropriate holding levels. Contact our technical team for model-specific spare parts recommendations.

Ready to Specify a CO₂ Compressor for Your Process?

Our application engineering team provides free CO₂ compressor sizing, inter-stage condensation analysis, shaft sealing specification, foundation load data, and complete technical documentation for both Series A and Series B CO₂ compression projects. Factory-direct pricing, global export, and custom design within 11 kW to 3,000 kW.