Sicurezza dei Sistemi Comando

Determinazione del B10 di componenti pneumatici in accordo con ISO 19973(*) e conversione nel MTTFd di EN ISO 13849-1: esempio.

Determining B10 values for pneumatic components according to ISO 19973 e converting a B10 value into an MTTFd value EN ISO 13849-1.

Definition of the B10 value Statistically expected value for the number of cycles at which 10% of the components have exceeded the limit values defi ned for the test (switching time, leakage, switching pressure etc.) under specifi c conditions.
But: a component can also fail before the B10 value is reached.
The service life cannot be guaranteed.
The B10 values are defi ned on the basis of the results from longterm tests with at least 7 test objects.
The B10 value may be used for the safety specific evaluation and for establishing the preventive maintenance of systems (TPM = Total Productive Maintenance).

Festo

ISO 19973-2:2007
Pneumatic fluid power - Assessment of component reliability by testing - Part 2: Directional control valves


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