Dual cylinder testing and marking line mod. DT

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Dual cylinder testing and marking
Description and

The dual cylinder testing and marking line mod. DT is a fully automatic line for testing and marking high-pressure gas cylinders where testing is dual as it is able to perform both the hydraulic test and the water jacket for hydraulic expansion test.

The mod. DT is a fully automatic line; for a manual loading line for testing with a water jacket system, consult the data sheet relating to mod. WJ.

The type of test is decided at the start of the cycle so the cylinder can be tested with one method or the other and not with both methods in the same cycle.

The dimensions of c ylinders  processed with this system are:

  • Diameter 140-406mm
  • Length 300-2000mm

The operations performed in the cycle are:

  • Empty weighing
  • Filling with water
  • Full weighing
  • Testing
  • Emptying, washing and drying
  • Marking

Weighing and filling are done by a carousel with 8 stations served by a dedicated manipulator.

The carousel weighs both empty and full and the two data are sent to the marking machine to calculate the volume (the difference between the two data) and mark it.


The hydraulic test consists of 6 stations and is served by a dedicated 5-axis manipulator. Each station is independent and is equipped with a pressure transducer, pressure gauge and pump.

The sealing of the cylinders is by automatic screwing. The hydraulic test is done up to 450 Bar.


Each station is equipped with a container for the water jacket sized for the largest of the cylinders to be tested.

During the water jacket cycle, the descent for the insertion of the cylinder into the test container and its hermetic closure take place automatically and safely.

The water jacket takes place completely automatically without using burettes and without being subject to the operator’s discretion. The reset before each cycle is also automatic.

Each container for the water jacket is built with two safety portholes with glass bursting discs and has a drain valve.


After testing, the manipulator passes the cylinders to emptying. It is equipped with a manipulator too , but this has 6-axis.

The emptying manipulator turns the bottle 180 degrees and places it in one of the 6 free stations.

Each station is independent and is equipped with a lower support cup and an upper one mounted on a cylinder which has the purpose of blocking the cylinder.

In each station a nozzle is inserted into the cylinder and compressed air is blown to speed up emptying.

Water is then sprayed through the same nozzle to wash the cylinder internally, then the valve is closed and the drying valve opens. The drying can take place according to the customer’s possibilities with hot air, or better with hot nitrogen or steam.


Cheaper than a similar robot, the manipulator is more compact having a limited reach to the service area and therefore does not require very large protected areas.

It is controlled by a PLC so it does not require the intervention of a programmer specialized in robotics in the event of maintenance or software changes.


All test and emptying cycle times can be adjusted via the supervision and configuration touchscreen panel.


After testing and emptying, the cylinder is moved to the marking area. The loading and unloading of the marking machine takes place automatically from roller conveyors with rubber rollers and inclined benchs.


The rubber rollers of our production, as well as having a duration equal to those in steel, allow to reduce noise pollution inside the factories.


The marking machine marks by rolling and automatically marks all fixed and variable data, thanks to the automatic numerators installed in the marking wheel.

The head can automatically mark the empty weight, the empty weight plus a tare due to the valve and the exact volume of the cylinder.


In the dual cylinder testing and marking line for high-pressure gas cylinders  if the cylinder does not pass the test it is declared rejected by the system and automatically discharged in a predetermined position.


  • Full automatic line for high-pressure gas cylinders
  • Dual testing with hydraulic test or water jacket
  • Cylinders with a diameter of 140-406mm and a length of 300-2000mm
  • Weighing and filling carousel equipped with manipulator
  • Test unit with 6 independent stations with 5-axis manipulator
  • Each station is equipped with a dedicated pump
  • Hydraulic test up to 450 bar
  • Water jacket tubes with automatic hermetic closure
  • Automatic water jacket test
  • Water jacket pipes with drain valve and two safety portholes with glass bursting discs
  • Unit for emptying, washing and drying with 6 independent stations and manipulator
  • Cycle times of testing and emptying adjustable via toucschreen panel
  • Transfer roller conveyors with rubber rollers that solve the problem of noise pollution and inclined benchs
  • Automatic marking machine that marks both fixed and variable data and in multiple files
  • Fast, clear and deep marking that is not covered by painting.
  • Defective cylinders automatically discharged in a predetermined position
Dual cylinder testing and marking
Dual cylinder testing and marking line mod. DT

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