Appendix 4. General Failure Rates
This appendix, which is an extract from an early version of FARADIP.THREE, provides some failure rates. The multiplying factors for quality and environment, together with an explanation of the columns, are given in Appendix 3. Up-to-date versions of FARADIP. THREE will contain more items and revised values.
| Item | Failure Rate in Failures per Million Hours | |||
| Accelerometer | 10 | 30 | ||
| Air compressor | 70 | 250 | ||
| Air supply (instrument) | 5 | 6 | 10 | |
| Alarm bell | 2 | 10 | ||
| Alarm circuit | ||||
| – Simple | 4 | |||
| – Panel | 45 | |||
| Alarm siren | 1 | 6 | 20 | |
| Alternator | 1 | 9 | ||
| Analyzer | ||||
| – CO2 | 100 | 500 | ||
| – Conductivity | 500 | 1 500 | 2 000 | |
| – Dewpoint | 100 | 200 | ||
| – Geiger | 15 | |||
| – Hydrogen | 400 | 100 | ||
| – Oxygen | 50 | 60 | 200 | |
| – pH | 650 | |||
| – Scintillation | 20 | |||
| – Bourdon/Geiger | 5 | |||
| – H2S | 100 | 200 | ||
| Antenna | 1 | 5 | ||
| Attenuator | 0.01 | |||
| Battery | ||||
| – Lead-acid | 0.5 | 1 | 3 | |
| – Ni-Cd/Ag-Zn | 0.2 | 1 | 3 | |
| – Lead-acid ... | ||||
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