Product Overview: ZW Series Hydrogen Recirculation Compressor
The ZW series hydrogen recirculation compressor is a vertical-frame (Z-type) multi-stage reciprocating piston compressor for hydrogen and hydrogen-rich gas compression at small-to-medium flow rates and moderate-to-high pressures. The vertical cylinder arrangement is the defining structural characteristic: cylinders are stacked vertically on the crankcase, producing a compact, low-footprint machine that occupies far less floor space than a horizontal LW series machine of comparable pressure rating. This makes the ZW series the preferred choice for hydrogen recirculation duties at pilot plant scale, laboratory reactor systems, small hydrotreating units, fuel cell test bench supply, and precision hydrogen production applications where 0.10–15 Nm³/min of gas must be delivered at pressures up to 3.0 MPa in a space-constrained installation.
The entire ZW series hydrogen range operates at 380 V — no high-voltage supply is required for any model. Machine weights start at 0.58 t for the smallest models and reach 6.0 t for the largest three-stage 160 kW unit, making the ZW series suitable for installation on existing building floors, mezzanine structures, and rooftop plant rooms without specialist lifting equipment. All standard hydrogen service requirements — oil-free PTFE piston rings, copper-free wetted parts, ATEX Zone 1 Group IIC electrical equipment, Type D double-compartment distance piece with continuous nitrogen purge, and NACE MR0103 materials for H₂S-containing service — are standard on every ZW hydrogen unit, not optional upgrades. API 618 and GOST-R certification with full Rostechnadzor documentation is provided as standard for Russia and CIS deliveries.
Typical applications: Small refinery hydrotreating unit H₂ recirculation (single reactor train, below 1,000 Nm³/h recirculation duty), fuel cell system hydrogen supply and recirculation, laboratory and pilot plant reactor H₂ loops, hydrogen production plant compression (electrolyser to storage), biomass-to-hydrogen pilot units, hydrogen vehicle refuelling station compression (to 30 bar intermediate storage), small-scale chemical synthesis with H₂ (hydrogenation reactors), and process gas purification pre-compression.
Technical Specifications — Low and Medium Pressure (0.40–1.10 MPa)
Single-stage and two-stage vertical configurations for low-pressure hydrogen recirculation, small hydrotreating loop boost, and hydrogen transfer. All models 380 V, oil-free PTFE, copper-free, ATEX IIC, Type D distance piece with N₂ purge.
| Model |
Config |
Flow (Nm³/min) |
Discharge (MPa) |
Dimensions L×W×H (mm) |
Weight (t) |
Power (kW) |
Voltage |
| ZW-1/8 |
2-col 2-stage |
1.0 |
0.80 |
720×763×1274 |
0.58 |
15 |
380 |
| ZW-2/4 |
2-col 2-stage |
2.0 |
0.40 |
1520×800×1360 |
0.58 |
15 |
380 |
| ZW-2/11 |
2-col 2-stage |
2.0 |
1.10 |
720×763×1475 |
0.80 |
18.5 |
380 |
| ZW-3/7 |
2-col 2-stage |
3.0 |
0.70 |
1520×800×1300 |
0.58 |
22 |
380 |
| ZW-3/0.2–8.6 |
2-col 2-stage |
3.0 |
0.02–0.86 |
2250×1296×2200 |
2.00 |
30 |
380 |
| ZW-4/8 |
2-col 2-stage |
4.0 |
0.80 |
2250×1296×2200 |
2.00 |
30 |
380 |
| ZW-6/8 |
3-col 3-stage |
6.0 |
0.80 |
2250×1296×2200 |
2.10 |
45 |
380 |
| ZW-15/8 |
2-col 2-stage |
15.0 |
0.80 |
2390×1800×2800 |
5.00 |
132 |
380 |
ZW-3/0.2–8.6: variable discharge pressure range 0.02–0.86 MPa for back-pressure adjustable recirculation loops. ZW-6/8 and 3ZW series use a 3-column frame for higher flow without increasing machine height. All dimensions L×W×H in mm.
Technical Specifications — High Pressure (2.00–3.00 MPa)
Three-stage vertical configurations for hydrocracking loop recirculation, hydrogen storage pre-compression, hydrogen vehicle refuelling intermediate storage, and high-pressure synthesis reactor H₂ recirculation. The 3ZW three-column models provide higher flow at 3.0 MPa without a larger frame.
| Model |
Config |
Flow (Nm³/min) |
Discharge (MPa) |
Dimensions L×W×H (mm) |
Weight (t) |
Power (kW) |
Voltage |
| ZW-0.1/21–25 |
2-col 2-stage |
0.10 |
2.50 |
720×763×1640 |
0.80 |
7.5 |
380 |
| ZW-0.25/13–24 |
2-col 2-stage |
0.25 |
2.40 |
550×985×2013 |
1.00 |
11 |
380 |
| ZW-1/25 |
2-col 3-stage |
1.0 |
2.50 |
1550×1340×1910 |
2.83 |
30 |
380 |
| ZW-1.5/25 |
2-col 3-stage |
1.5 |
2.50 |
1550×1340×1910 |
3.00 |
30 |
380 |
| ZW-3/30 |
2-col 3-stage |
3.0 |
3.00 |
1920×1900×2825 |
3.50 |
45 |
380 |
| ZW-8/20 |
2-col 2-stage |
8.0 |
2.00 |
1845×1660×2360 |
3.00 |
75 |
380 |
| 3ZW-6/30 |
3-col 3-stage |
6.0 |
3.00 |
1845×1660×2360 |
3.00 |
75 |
380 |
| 3ZW-9.5/30 |
3-col 3-stage |
9.5 |
3.00 |
1845×1660×2360 |
3.50 |
110 |
380 |
| ZW-13/30 |
2-col 3-stage |
13.0 |
3.00 |
2764×2000×3277 |
6.00 |
160 |
380 |
ZW-0.1/21–25: inlet pressure 2.10 MPa, discharge 2.50 MPa — single-stage boost within existing high-pressure loop. ZW-0.25/13–24: inlet 1.30 MPa, discharge 2.40 MPa — intermediate loop boost. 3ZW prefix indicates 3-column frame. All dimensions L×W×H in mm.
General Series Parameters
| Parameter |
ZW Series H₂ Recirculation |
| Compression Medium |
Hydrogen, hydrogen-rich gas (above 70% H₂), hydrotreating loop gas, synthesis gas |
| Pressure Range |
0.40–3.00 MPa discharge (some models from 0.02 MPa inlet) |
| Flow Range |
0.10–15 Nm³/min (6–900 Nm³/h) at 0°C, 0.1013 MPa |
| Motor Power |
7.5–160 kW |
| Drive Voltage |
380 V throughout — all 17 models |
| Frame Configuration |
Vertical (Z-type); 2-column (ZW) or 3-column (3ZW); 2 or 3 compression stages |
| Machine Weight |
0.58–6.0 t |
| Lubrication |
Oil-free PTFE piston rings and packing — all models, all stages |
| ATEX Classification |
Zone 1, Group IIC — all models |
| Wetted Materials |
Copper-free throughout; 316L SS or NACE MR0103 for H₂S service |
| Distance Piece |
Type D + continuous N₂ purge — all models |
| Design Standard |
API 618 Fifth Edition; GOST-R (Russia / CIS) |
| Certification |
ISO 9001:2015, GOST-R, ATEX Zone 1 Group IIC, Pressure Vessel License |
Working Principle and Vertical Frame Engineering
The ZW series uses the vertical reciprocating piston principle. The crankshaft is horizontal at the base of the machine, and the cylinders project vertically upward from the crankcase. This arrangement produces the defining footprint advantage of the Z-type frame: the machine occupies a small horizontal floor area relative to its throughput because the compression volume is developed vertically rather than horizontally. A ZW-3/30 three-stage unit handling 3 Nm³/min at 3.0 MPa occupies a floor plan of approximately 1.92 m x 1.90 m — small enough to install in a standard instrument equipment room or a process skid where an equivalent horizontal machine would not fit.
Gas passes through two or three compression stages in sequence, with an interstage cooler and separator between each stage. For hydrogen compression to 2.5–3.0 MPa, three stages are required to maintain acceptable discharge temperatures: the high specific heat ratio of hydrogen (approximately 1.41 at ambient conditions) means each stage compresses hydrogen more rapidly in temperature than an equivalent compression of a heavier gas, so the stage compression ratio must be limited — typically to 2.5–3.5:1 per stage — to avoid overheating the PTFE piston rings and packing. Three stages at a ratio of approximately 3.1:1 each produce a total compression ratio of approximately 30:1, sufficient to compress atmospheric hydrogen to 3.0 MPa.
Vertical Crankcase and Cylinders
Cylinders project vertically above the horizontal crankshaft. Compact floor footprint. Gravity-assisted piston ring seating improves PTFE ring consistency. Vertical orientation also prevents lubricant migration into the cylinder in the event of a packing failure — an additional oil-contamination protection layer for catalyst-sensitive reactor loops.
Multi-Stage PTFE Compression
Two or three compression stages with intercooling reduce the compression ratio per stage, keeping discharge temperatures within the PTFE operating window (below 150°C at cylinder wall). PEEK valve elements replace PTFE at elevated temperatures for hydroprocessing loop gas with trace aromatic components.
Type D Distance Piece + N₂ Purge
Double-compartment distance piece with nitrogen purge at positive pressure on every ZW hydrogen unit. Hydrogen leaking past the PTFE packing enters the nitrogen purge stream rather than reaching the crankcase oil or machine room air. The purge vent is routed to a safe outdoor discharge point.
3ZW Three-Column Variant
The 3ZW models add a third vertical cylinder column to increase flow capacity without increasing machine height or footprint. The 3ZW-9.5/30 delivers 9.5 Nm³/min at 3.0 MPa in a 1.85 m x 1.66 m footprint at 3.5 t — the same envelope as the ZW-8/20 at 2.0 MPa but at 50% higher discharge pressure and 19% higher flow.
Application Scenarios
🏭Small Hydrotreating Unit H₂ Recirculation
Small refinery hydrotreating units processing below 100,000 tonnes per year of feed require hydrogen recirculation flows in the 60–600 Nm³/h range — covered by the ZW series at 1–10 Nm³/min. The compact vertical footprint allows the ZW compressor to be installed within the existing hydrotreating unit structure without new building work. For hydrotreating loop gas containing H₂S, NACE MR0103 materials are specified per the H₂S concentration provided at enquiry. The ZW-4/8, ZW-6/8, and ZW-8/20 are the most commonly specified models for this service, covering 4–8 Nm³/min at 0.8–2.0 MPa discharge.
⚡Fuel Cell Test Systems and Hydrogen Vehicle Refuelling
Fuel cell test benches require controlled hydrogen supply at pressures of 0.4–1.0 MPa and relatively small flow rates — exactly the ZW-1/8, ZW-2/4, ZW-2/11, and ZW-3/7 operating range. The small machine weight (0.58–2.0 t) makes these models easily located within a test facility without a dedicated compressor room or heavy foundation. For hydrogen vehicle refuelling intermediate storage at 30 bar (3.0 MPa), the ZW-1/25, ZW-1.5/25, ZW-3/30, and 3ZW-6/30 cover the compression step from pipeline or electrolyser pressure to 30 bar intermediate storage, from which the final cascade fill to 700 bar uses a separate high-pressure stage.
🔌Electrolyser Output Compression and Hydrogen Production
Proton exchange membrane (PEM) and alkaline electrolysers typically produce hydrogen at 0.1–0.8 MPa. Compressing this hydrogen to 2.5–3.0 MPa for pipeline injection, storage, or downstream use is a common ZW series application at small electrolyser installations in Russia. For green hydrogen pilot projects producing 10–900 Nm³/h of H₂, the ZW-0.25/13–24, ZW-1/25, ZW-1.5/25, and ZW-3/30 cover the flow range. All ZW hydrogen units use oil-free PTFE compression as standard — essential for electrolyser-quality hydrogen where any oil contamination would degrade downstream fuel cell performance or catalyst life.
🔥Laboratory and Pilot Plant Reactor H₂ Loops
University research reactors, hydrogenation pilot plants, and chemical process development units require hydrogen circulation at flows of 0.1–1.0 Nm³/min and pressures up to 3.0 MPa — the smallest ZW models: ZW-0.1/21–25 at 7.5 kW and ZW-0.25/13–24 at 11 kW. These units weigh 0.80–1.0 t and have a floor footprint of less than 1.0 m², making them installable in laboratory buildings without a dedicated compressor room. ATEX Zone 1 Group IIC certification is required for laboratory hydrogen service regardless of scale. GOST-R documentation for Rostechnadzor registration is provided as standard for all Russia installations regardless of scale.
Core Advantages of the ZW Series
📈
Smallest Footprint for Pressure Class
The vertical Z-type frame produces the smallest horizontal floor area of any reciprocating compressor type at equivalent pressure and flow. A ZW-3/30 three-stage unit at 3.0 MPa occupies less than 4 m² of floor space. The equivalent capability in a horizontal frame would require 2–3 times more floor area.
⚡
380 V Across the Entire Range
Every ZW series hydrogen model — from 7.5 kW to 160 kW — uses a standard 380 V motor. No high-voltage supply, transformer, or switchgear is required at any model in the range. This is a significant installation cost and complexity saving for laboratory, pilot plant, and small industrial installations where 380 V is the only available supply.
🔥
3.0 MPa Discharge — Highest in the H₂ Recirculation LW/ZW Range
The ZW series reaches 3.0 MPa discharge in its standard three-stage configuration — 70% higher than the maximum 1.8 MPa of the LW hydrogen recirculation series. This makes the ZW the only standard model for hydrogen intermediate storage at 30 bar, hydrocracking loop recirculation, and high-pressure synthesis reactor H₂ supply in the LW/ZW range.
🕑
Light Weight — No Heavy Foundation Required
Machine weights of 0.58–6.0 t allow installation on standard reinforced concrete floor slabs in existing buildings. The smallest ZW models (ZW-1/8, ZW-2/4, ZW-3/7 at 0.58 t) can be installed on mezzanine structures and relocated as process development requirements change.
📄
GOST-R and Rostechnadzor for All Scales
Full GOST-R certificate, technical passport, ATEX IIC certificates, and Rostechnadzor registration documentation provided for every ZW hydrogen unit delivered to Russia and CIS — including the smallest laboratory-scale 7.5 kW models. Hydrogen service requires classification as an explosive-atmosphere hazardous production facility regardless of unit scale under Russian Federal Law 116-FZ.
🌎
Russia-Based PTFE Parts Supply
PTFE piston rings, packing, and PEEK valve elements for all ZW hydrogen models are manufactured in-house and stocked in Russia. Critical replacement parts dispatched within 24–72 hours. For laboratory and pilot plant installations where a compressor outage pauses an ongoing research programme, rapid local spare parts supply is a practical necessity.
Material Specifications for Hydrogen Service
| Component |
Clean H₂ Service |
H₂ with H₂S (Hydrotreating Loop) |
| Cylinders |
HT250 cast iron (copper-free) |
316L SS; NACE MR0103 where required |
| Piston Rings / Packing |
PTFE oil-free — all stages |
PTFE oil-free — all stages |
| Piston Rods |
42CrMo, chrome plated (copper-free) |
Inconel overlay for severe H₂S service |
| Gas Valves |
CS or 316L SS body; PEEK elements |
316L SS body; PEEK elements; copper-free seats |
| All Wetted Fittings |
No copper alloy fittings anywhere in gas circuit |
No copper alloy fittings anywhere in gas circuit |
| Distance Piece |
Type D + N₂ purge — all models |
Type D + N₂ purge — all models |
| Electrical Equipment |
ATEX Zone 1, Group IIC — all models |
ATEX Zone 1, Group IIC — all models |
Selection Guide: ZW vs. LW for Hydrogen Recirculation
1
Choose ZW when flow is below 15 Nm³/min — the ZW range starts at 0.10 Nm³/min and ends at 15 Nm³/min, covering all duties below the minimum LW model. For duties in the 15–75 Nm³/min range, the LW series provides the correct horizontal machine. If the flow falls in the ZW range but the pressure required is above 3.0 MPa, the DW or 4MW series should be assessed for higher-pressure duties.
2
Choose ZW when discharge pressure exceeds 1.8 MPa — the LW hydrogen recirculation series reaches a maximum of 1.8 MPa. For any duty at 2.0–3.0 MPa, the ZW-8/20, ZW-3/30, 3ZW-6/30, 3ZW-9.5/30, or ZW-13/30 are the appropriate machines. The ZW reaches 3.0 MPa in a 380 V standard machine — no high-voltage supply is required.
3
Choose ZW when footprint is constrained — the vertical frame occupies 50–70% less floor area than an LW machine of comparable throughput. For installation within existing buildings, on mezzanine structures, or on process skids with a fixed space allocation, the ZW series typically permits installation where the LW series would not fit.
4
Provide full gas composition and H₂S concentration at enquiry — the H₂ purity and H₂S concentration determine materials (NACE MR0103 if H₂S exceeds the threshold partial pressure), valve element selection (PEEK for trace aromatic content in hydrotreating loop gas), and the ATEX IIC certificate scope. All ZW hydrogen units are ATEX Group IIC — this is not determined by composition for this series, as all hydrogen and hydrogen-rich service is IIC by definition.
ZW Series vs. Alternatives
Transparency Notice: Burckhardt Compression Laby, Borsig, and Sauer Compressors are referenced for performance class comparison only. We do not manufacture or claim affiliation with these brands. All ZW compressors are original designs. We do not sell counterfeit or unlicensed products.
| Factor |
ZW H₂ Recirculation |
Burckhardt Laby |
Borsig / Sauer |
| GOST-R (Russia / CIS) |
✓ Standard |
Case by case |
Case by case |
| ATEX IIC as standard |
✓ Included |
Available |
Available |
| Oil-free as standard |
✓ Included |
✓ Included |
Available |
| Capital Cost |
30–50% below European |
High (CHF) |
High (EUR) |
| Lead Time |
3–5 months |
12–20 months |
10–16 months |
| Spare Parts (Russia) |
In-house; 24–72 h |
Import; 4–12 weeks |
Import; 4–12 weeks |
| Min. Model Power |
7.5 kW |
Typically 15 kW+ |
Typically 15 kW+ |
Factory acceptance test — every ZW series hydrogen unit undergoes a full run test with ATEX IIC systems armed, oil-free cylinder operation verified, and Type D nitrogen purge flow confirmed before shipment from our Russian facility
Frequently Asked Questions — ZW Series Hydrogen Recirculation Compressor
Q1: What is the difference between the ZW series and the LW series for hydrogen recirculation?
The ZW series uses a vertical cylinder frame (Z-type); the LW series uses a horizontal long-stroke frame (L-type). ZW covers 0.10–15 Nm³/min at up to 3.0 MPa in a compact, lightweight, all-380 V machine. LW covers 15–75 Nm³/min at up to 1.8 MPa in a larger horizontal machine at 380 V or 6/10 kV. The ZW is chosen when flow is below 15 Nm³/min, when pressure above 1.8 MPa is required, when footprint is constrained, or when only 380 V supply is available and the flow falls within the ZW range. All hydrogen service engineering requirements — oil-free PTFE, copper-free, ATEX IIC, Type D distance piece — are identical in both series.
Q2: Why does the ZW series reach 3.0 MPa when the LW hydrogen series only reaches 1.8 MPa?
The ZW series reaches 3.0 MPa by using three compression stages in its vertical frame, each stage with a progressively smaller bore and higher wall thickness as the gas is compressed to higher pressure. Three stages at approximately 3.1:1 compression ratio per stage achieve the overall 30:1 ratio needed to compress atmospheric hydrogen to 3.0 MPa while keeping the stage discharge temperature below the PTFE ring operating limit. The LW horizontal series reaches a maximum of 1.8 MPa in its standard multi-stage configuration. For pressures above 3.0 MPa, the DW series mid-high pressure range or the 4MW chemical process group should be considered.
Q3: What does ZW-0.1/21–25 mean and what is it used for?
The model designation ZW-0.1/21–25 indicates: ZW type (vertical reciprocating), flow 0.10 Nm³/min, inlet pressure range 2.10 MPa, discharge pressure 2.50 MPa. This is a high-pressure loop boost compressor — not a machine that compresses from atmospheric to high pressure, but one that accepts gas already at 2.10 MPa in an existing high-pressure loop and boosts it to 2.50 MPa across a 0.40 MPa pressure differential. At 0.10 Nm³/min and 7.5 kW, the ZW-0.1/21–25 is the smallest model in the hydrogen recirculation series, suited to laboratory-scale high-pressure reactor loops or precise small-flow process development duties where the gas is already at elevated pressure and only a small boost is required to maintain loop circulation.
Q4: Can ZW series machines be used for green hydrogen compression from electrolysers?
Yes — the ZW series is well matched to electrolyser output compression for small and medium green hydrogen projects. PEM and alkaline electrolysers typically produce hydrogen at 0.1–0.8 MPa; ZW three-stage models compress this to 2.5–3.0 MPa for pipeline injection or intermediate storage. Electrolyser-quality hydrogen is essentially pure H₂ (99.99%+) and contains no H₂S, so standard carbon steel wetted parts (copper-free) are used without NACE upgrade. Oil-free PTFE compression is essential to maintain hydrogen purity — the electrolyser gas must not be contaminated with compressor oil before delivery to the downstream use point. All ZW hydrogen models are oil-free as standard, making them suitable for green hydrogen service without modification.
Q5: What is the minimum ceiling height required for a ZW three-stage unit?
The tallest standard ZW model is the ZW-13/30 at 3,277 mm overall height. Adding the required headroom for cylinder head removal during maintenance (typically 500–800 mm above the tallest cylinder) means a minimum ceiling height of approximately 4.0–4.2 m is recommended for the ZW-13/30. For the smaller ZW models — ZW-1/8 at 1,274 mm, ZW-2/4 at 1,360 mm, ZW-3/7 at 1,300 mm — standard industrial ceiling heights of 3.0 m are more than sufficient with full maintenance access above the cylinders. Confirm the machine height and maintenance access clearance required for the specific model at enquiry; this information is included in the technical proposal with the certified dimensional drawing.
Q6: How does the 3ZW three-column variant differ from the standard ZW two-column machine?
The standard ZW uses two vertical cylinder columns on a single crankshaft. The 3ZW adds a third vertical cylinder column, increasing the total swept volume per revolution by 50% compared to a two-column machine with the same bore and stroke. This allows the 3ZW-6/30 to deliver 6 Nm³/min at 3.0 MPa in the same footprint as the ZW-8/20 at 2.0 MPa — achieving 50% higher discharge pressure at 75% of the flow, in the same envelope and at the same machine weight (3.0 t). The 3ZW-9.5/30 at 9.5 Nm³/min and 3.0 MPa is the highest-flow single-machine option in the ZW range at 3.0 MPa discharge, covering medium-scale hydrocracking recirculation duties that would otherwise require two standard ZW-3/30 machines in parallel.
Q7: What capacity control is available on the ZW hydrogen series?
Variable frequency drive (VFD) on the 380 V motor is the primary capacity control method for ZW hydrogen units, providing smooth continuous modulation from approximately 50–100% of design flow with proportionally reduced power. For the smallest models (7.5–22 kW), VFD is economical and straightforward. For the larger models (75–160 kW), suction valve unloaders on one cylinder column provide a simpler step-wise 50% turndown as an alternative to VFD. Specify the minimum required flow and any variable-flow operating requirement at enquiry; the capacity control selection is confirmed in the technical proposal based on the duty cycle.
Q8: What maintenance does a vertical ZW machine require compared to a horizontal LW?
The ZW vertical cylinder arrangement provides top access to the cylinder head, piston, rings, and valves from above — with no lateral access required, only vertical overhead clearance above the cylinder tops. For the smaller ZW models with cylinder heights below 1.5 m, head and valve access is from a standing position on the machine base or from a low step. PTFE ring and packing replacement follows the same procedure as the LW series: remove the cylinder head, extract the piston assembly, replace the rings and packing on the piston and stuffing box, reassemble. Typical time per cylinder: 3–5 hours for a trained maintenance team. Gas valve access is from the side of each cylinder without removing the piston assembly; valve replacement is typically 1–2 hours per valve position.
Q9: What GOST-R documentation is provided and what does Rostechnadzor registration require for ZW H₂ units?
Every ZW hydrogen unit delivered to Russia or EEU member states is supplied with: GOST-R certificate of conformity, technical passport with all hydrogen service design parameters, pressure vessel certification for all interstage coolers and separators, ATEX Zone 1 Group IIC certificates for all explosion-proof equipment, nitrogen purge system documentation, factory acceptance test report, and Russian-language operating and maintenance instructions. Hydrogen compression facilities in Russia are classified as explosive-atmosphere hazardous production facilities under Federal Law 116-FZ and require Rostechnadzor registration before startup. This applies regardless of machine scale — the 7.5 kW ZW-0.1/21–25 requires the same registration as the 160 kW ZW-13/30 when handling hydrogen in a Russian facility. We dispatch the documentation package 2–3 weeks before machine shipment to allow registration to begin in parallel with installation.
Q10: What spare parts should be stocked on-site and how long do they last?
The recommended two-year operating stock for a ZW hydrogen unit includes: two complete sets of PTFE piston rings and packing for each cylinder stage (supporting three to four ring replacements at 6,000–8,000 hours each), one complete set of PEEK gas valve elements for each cylinder position across all stages, and one set of nitrogen purge system O-rings, gaskets, and seals. For the smallest ZW models (ZW-1/8 through ZW-3/7 at 0.58 t), the entire two-year spare parts stock for a single machine can be stored in a small parts cabinet. All PTFE and PEEK parts are manufactured in-house at our Russian facility and can be dispatched within 24–72 hours of order. For research and pilot plant installations where a compressor outage delays a time-sensitive experimental programme, having one complete replacement ring-and-packing set immediately available on-site is strongly recommended.
Request a Technical Proposal
Our engineering team supplies ZW series hydrogen recirculation compressors to refineries, chemical plants, research institutions, and green hydrogen projects across Russia and the CIS. Oil-free PTFE compression, ATEX Zone 1 Group IIC, and GOST-R certification are standard on every unit. Russia-based PTFE and PEEK spare parts dispatch within 24–72 hours.
ZW Series Hydrogen Recirculation — Engineering Enquiry
Discuss Your H₂ Recirculation, Production, or Pilot Plant Project
Process engineers with refinery and hydrogen service experience answer all enquiries. GOST-R and Rostechnadzor documentation included. Response within 48 hours.
Request a Technical Quote
Include in Your Enquiry
✓ Application type (hydrotreating / electrolyser / lab / other)
✓ H₂ recirculation flow (Nm³/h or Nm³/min)
✓ Suction and discharge pressures (MPa)
✓ H₂ purity (mol%) and H₂S concentration (ppm)
✓ Available floor space (m²) and ceiling height (m)
✓ Available voltage (380V confirmed)
✓ GOST-R / Rostechnadzor requirement
✓ Required delivery date
