System reliability — series and parallel combination

Combined system reliability for two components, both in series and in parallel.

✓ validated against legacyoriginal: /calculators/c1_5.htm

System reliability — series and parallel combination — original diagram from /calculators/c1_5.htm

Reliability R(t) of component 1Reliability R(t) of component 2

Reliability, series0.81

Reliability, parallel0.99

Method & references

System reliability combination rules — series (product) and parallel (complement of product of complements).

The computation is a literal port of the original client-side JavaScript from /calculators/c1_5.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

System reliability — series and parallel combination — Engineering ABC