Extreme Pressures Require Extreme Safety

Supplier: CEJN Australia
26 February, 2021

Extreme ultra high-pressure hydraulics creates extreme forces that have the potential to cause serious personal injuries or even fatalities.

Although incidences are uncommon, an improperly locked coupling set could blow off and hit someone, or a hose failure could generate a hydraulic oil beam powerful enough to puncture a human body. When extreme pressures are combined with extreme applications, such as when a hydraulic jack is used to lift a building, safety must be the utmost concern. 

By never settling for average safety compliance in our production audits or safety testing, we have introduced innovative safety technology and unprecedented safety testing principles. This safety-first approach has enabled CEJN to be the market leader in safe products, making us the company customers turn to for products designed to perform reliably and protect individuals from harm.

Sealed for Safety

When comparing the different types of sealing methods available on the market, it's easy to see why the CEJN Metal Seal (CMS) is the optimum and recommended sealing method.

Ultra high pressure hydraulics metal seal

CEJN Metal Seal
CEJN Metal Seal was developed to be a safe and reliable seal even at extremely ultra high pressures. It allows sealing to take place on a small diameter, reducing strain on the parts and thereby minimizing the risk of damage parts on component bodies. The seal allows reassembly without damaging the seal surface.

Ultra high pressure hydraulics Bonded Dowty Seal Ring

Bonded/Dowty Seal Ring 
Although it might do the job for pressures up to 100 MPa, this type of sealing is neither safe nor durable enough for the highest working pressures.

Ultra high pressure hydraulics Conical Thread Seal

Conical Thread Seal
This sealing method must be combined with a liquid sealer or sealing tape, but it still won’t provide the necessary safety for ultra high pressure applications.


Ultra High-Pressure Safeguards

When comparing the different types of sealing methods available on the market, it's easy to see why the CEJN Metal Seal (CMS) is the optimum and recommended sealing method.

Always make sure that:

  • Products you choose correspond with the required pressure rating. Check part number and rated pressure.
  • All components are CEJN originals. Don’t mix brands!
  • All hose assemblies are pressure tested
  • CEJN safety instructions are followed closely
  • Correct assembly torque is used
  • Hose outer cover is examined for signs of damage

Ensuring Safe Assembly

Risk: Improperly made hose assemblies have the potential to cause injuries or even fatalities.
CEJN’s Role: Hose assemblies made at CEJN ultra high-pressure centers are always tested. Our standard procedures include using only original CEJN components (hose, fittings, couplings, and nipples) and following stringent specifications for crimping and pressure testing each hose assembly before delivery. Testing certifications, including tracking numbers, can be provided per batch or for individual hose assemblies.

Ensuring Proper Connection
Risk: When working in poor conditions or poorly lit areas, there is a risk that couplings may not be completely connected.
CEJN’s Role: CEJN alert rings are visual safeguards for ensuring proper connection. If the red ring is visible, the coupling isn’t connected. 

Avoiding Unintentional Disconnection

Risk: A properly connected coupling is completely safe at full working pressure. However, unintentional disconnection can occur either when pumps, tools, or hoses are moved or when a coupling is not fully connected.
CEJN’s Role: To prevent unintentional disconnection CEJN offers a manual safety lock that requires the operator to manually disengage the nipple. For our Flat-Face couplings, we offer an automatic safety lock to eliminate unintentional disconnection.

Protecting Hose Against Wear and Tear

Risk: High-Pressure hose subjected to wear and tear can lead to premature hose failure/fitting separation, which can result in operator injuries and equipment failure.
CEJN’s Role: CEJN transparent PVC hose covers protect the hose from abrasion, thereby preventing operator injuries or equipment damage due to hose failure. CEJN kink protectors are an added protection against wear and tear by preventing abrasion. Their ergonomic grip gives operators a solid hold on hose.


  • Always use CEJN Metal Seals whenever possible
  • Always use original CEJN components and never mix brands
  • Always follow CEJN safety recommendations