Safety regulations for hydraulic connections stipulate inspection of existing hydraulic connections at regular intervals.
    The hydraulic connection must be replaced if the following defects are found as a result of such an inspection:

•    damage to the outer layer extending to the sleeve, for example: abraded spots, cuts or cracks;
•    embrittlement of the outer layer due to the formation of cracks in the hose material;
•    shape changes that do not correspond to the natural shape of the hose (hydraulic connection) both under pressure and without pressure or when bent, for example: separation of layers, formation of bubbles;
•    damage or deformation of the hose fittings (leakage). Minor surface damage is not grounds for replacement;
•    fittings falling out of the hose;
•    reinforcement corrosion affecting strength and function;
•    non-compliance with installation requirements;
•    exceeding the shelf life and operation.

    The standard "Safety requirements for jetting systems and their parts" (DIN EN 982) clearly defines the requirements for the repair of hydraulic connections:
    "Hose lines must not be made from hoses that have previously been used as hose lines. Hose lines must comply with all requirements listed in the relevant European and/or international requirements.
Hose manufacturer's instructions for storage must be observed.
Consideration should be given to the recommendations regarding the service life of the hose lines."

    The norm DIN EN 982 is a B2 norm, therefore it is practically of a legislative nature, i.e., in legal cases, this norm can serve as the basis for a court decision. This must be taken into account when claiming damages.