Who is CJC and what does it make?
CJC (C.C.Jensen) is a Danish manufacturer of offline filtration systems for industrial oils, with over 70 years of activity in protecting equipment oil supply. The range covers fine filtration for particle removal, water removal units, varnish (oxidation product) removal units and acidity removal units for hydraulic, gear, turbine, engine lubrication, transformer and diesel fuel oils. From the CJC range we can quote offline filtration units for hydraulic and lubrication installations.
What sets CJC apart is its focus on offline filtration — a separate slow-recirculation circuit passing the oil through dedicated units, installed in parallel with the main system, as opposed to online filtration integrated directly on the pressure line. This principle makes it possible to remove not only solid particles but also water, oxidation products (varnish) and acidity, contaminants that standard online filtration does not treat effectively.
For Romania, CJC is relevant for large hydraulic installations, industrial and wind turbines, power transformers and ships, where extending oil life and reducing downtime for oil changes justify investment in a dedicated offline filtration circuit.
What do we supply from the CJC range?
| Product | Description |
|---|---|
| Fine filtration units (particle removal) | Offline filtration units dedicated to removing solid particles from oil, installed in a separate slow-recirculation circuit, in parallel with the main hydraulic or lubrication system. They reduce wear on sensitive components (valves, bearings) caused by particle contamination. Typical application: industrial hydraulic circuits and turbine lubrication systems. For a quotation, the customer must send the oil type, the tank volume and the estimated contamination level. |
| Water removal units | Units dedicated to removing water from oil (by absorption in the fine filters or by separating free water in filter separators), a contaminant that accelerates oxidation and corrosion of metal components. Used where ambient humidity or condensation enters the oil tank. Typical application: hydraulic installations exposed to temperature variations or high humidity. For a quotation, the customer must state the oil type and the water level detected by analysis. |
| Varnish removal units | Units for removing the oxidation products (varnish) that deposit on the internal surfaces of hydraulic and lubrication systems, causing valve sticking and reduced heat exchange efficiency. Typical application: industrial turbine lubrication systems where varnish deposits affect reliability. For a quotation, the customer must send the results of an oil analysis or the type of symptoms observed (valve sticking, filter clogging). |
| Acidity removal units | Units that reduce oil acidity caused by thermal or oxidative degradation, extending the useful life of the oil and protecting metal components from corrosion. Typical application: transformer oils and turbine control oils. For a quotation, the customer must send the oil type and the measured acidity value (if available). |
Why CJC?
- Over 70 years of experience in industrial oil filtration
- Contaminants treated — solid particles, water, varnish (oxidation products) and acidity
- Compatible with a wide range of oils: hydraulic, gear, turbine, transformer, diesel fuel and biological oils
- Slow offline recirculation principle, which does not disturb the installation's main pressure circuit
- Sectors served: marine and offshore, mining and cement, power generation, wind energy and industry
Which CJC codes and series are requested most often?
| Code | Description |
|---|---|
| HDU 15/25 | compact fine filtration unit for small hydraulic systems |
| HDU 15/50 | compact unit with increased capacity for medium hydraulic systems |
| HDU 27/27 | unit with high dirt-holding capacity |
| HDU 27/54 | unit intended for medium-sized hydraulic and lubrication systems |
| HDU 27/108 | unit for large hydraulic, lubrication and cooling systems |
| HDU 427 | compact offline fine filter, for installations without space for multiple units |
| Fine Filter Units | category of units for removing fine particles from oil |
| Water Removal Units | units dedicated to removing water from process oil |
| Varnish Removal Units | units for removing varnish (oxidation products) from oil |
| Removing Acidity Units | units intended for reducing the acidity of industrial oil |
| Filter Inserts | filter cartridges used in CJC units |
Where is CJC equipment used?
- Marine and offshore — offline filtration for fuel and lubricating oil
- Mining — protection of heavy machinery hydraulic oil
- Wind energy — fine filtration for turbine gear oil
- Industrial production — offline filtration for hydraulic and lubrication circuits
- Energy — transformer oil conditioning
How do we supply CJC in Romania?
For CJC we work with the manufacturer's technical documentation when preparing a quotation. We source CJC offline filtration units through EU supply channels, to order, usually within 1–4 weeks of placing the order, depending on model and configuration. For a correct quotation, the customer must send the type of oil filtered, the installation volume and the type of contaminant targeted (particles, water, varnish or acidity) — ideally accompanied by a recent oil analysis. We do not promise permanent availability for CJC units — we check each configuration individually before confirming the delivery time.
Laboratory analysis of the customer's oil to determine the contamination level is carried out separately, by a specialised laboratory, before the filtration unit is sized.
Frequently asked questions about CJC
What is the CJC HDU 27/108 unit?
HDU 27/108 is the fine filtration unit in the CJC range dedicated to large hydraulic, lubrication and cooling systems, where the volume of oil processed is high. It works by passing the oil through a fine filter cartridge, which retains the solid particles in the oil. It is chosen according to the installation's flow and the estimated contamination level of the system.
What is the difference between CJC water units and varnish units?
Water removal units eliminate water from the oil, preventing corrosion, while varnish units retain the fine deposits formed by oil oxidation over time. The two types are chosen according to the dominant problem identified in the oil analysis of the hydraulic or lubrication system.
Do you supply CJC filtration units in Romania?
Yes, we source CJC units only on firm order, with a waiting time of usually 1–4 weeks, since we have no display units from this range. For a correct quotation tell us the targeted contaminant, water, particles or varnish, the system flow and the total volume of oil in the installation.
How do I request a CJC quotation?
Send the CJC code from the nameplate and the quantity; we reply in English with availability and the lead time written in the quotation.
Request a quoteUpdated: 12 November 2026 · Sources: C.C.Jensen A/S, C.C.JENSEN A/S (manufacturer documentation)