Annex C
(informative)
Calculating or evaluating MTTF D values for single components

C.1 General

Annex C gives several methods for calculating or evaluating MTTF D values for single components: the method given in C.2 is based on the application of good engineering practices for the different kinds of components; that given in C.3 is applicable to hydraulic components; C.4 provides a means of calculating the MTTF D of pneumatic, mechanical and electromechanical components from B 10 (see C.4.1); C.5 lists MTTF D values for electrical components.

C.2 Good engineering practices method

If the following criteria are met, the MTTF D or B 10D value for a component can be estimated according to Table C.1.

a) The components are manufactured according to basic and well-tried safety principles in accordance with ISO 13849-2:2012, or the relevant standard (see Table C.1) for the design of the component.

NOTE This information can be found in the data sheet of the component manufacturer.

b) The manufacturer of the component specifies the appropriate application and operating conditions for the SRP/CS designer.

c) The design of the SRP/CS fulfils the basic and well-tried safety principles according to ISO 13849-2:2012, for the implementation and operation of the component.