How to proof test hydraulic cylinders?

How to proof test hydraulic cylinders?

The purpose of the testing, also known as proof test, is to ensure the safety and functionality of cylinders. Many cylinders are safety critical components in a machine. This is why making sure they work properly, is extremely important.

What happens in a proof test?

The basic instructions for a proof test step by step:

1.  The cylinder is put to the test bench tightly and securely

2. Hoses are attached to the cylinder’s oil connections or ports

3. Testing pressure is checked from the work order or from the customer’s drawing

4. Worker tells the computer the cylinder’s values (the values differ depending on the cylinder in question) → the computer starts the test

5. During the test, a cylinder makes a specified amount of strokes (as in back and forth motion) → this rinses the cylinder from the inside

6. After the movements have been carried out, the worker starts the actual proof test → the cylinder is first pushed with overpressure rod out and then rod in

7. During the proof test, the welds are inspected in case of any mistakes or leaks in welds or seals

8. After the proof test has successfully been carried out, the pressure is released from the cylinder

Notice: The proof test is done with over pressure (a pressure that is more than the actual usage pressure at the final machine) This is to ensure that all the joints and welds in the cylinder can take the pressure. The internal leaks can be identified from the computer that shows the internal pressure in the cylinder.