The recurring strength test must take place at least every 10 years. The inspection takes the form of a liquid pressure test at a pressure of at least 1.3 times the permissible operating pressure but not exceeding the applied pressure in the manufacturer’s test.
Internal inspections must be carried out every 5 years in accordance with BetrSichV The inner wall of the hydraulic accumulator is examined for surface cracks, as are any other safety-relevant equipment, by means of die penetration, magnetic powder or ultrasound tests.
The external visual inspection as part of the recurring inspections should take place at the latest every 2 years. The surface of the diaphragm is checked externally for cracks and damage, as is the safety-relevant equipment.
The nitrogen pressure on the membrane side should be checked regularly, ideally every three months. The check must be done by an officially authorised person within the company or by an external service provider.