Examples of the FMECA files supporting the Open Revolution family of rebreathers
Fault Study Turbulent CO2 Bypass in Rebreather One-Way Valves(1.6MB)
Updated 14th Mar 2011 with extra material. An important fault mode that affects pliable valves, causing higher inhaled CO2 levels for the diver, and distortion of scrubber endurance test data if the fault is present or stimulated by the test. . The report includes evidence that the fault is not present in the Deep Life and OSEL ALVBOV.
FMECA Volume 3: Electronic Circuits Reviewed, as pdf (8.2MB)
Zip file contains pdfs of the circuit diagrams submitted for review (SubA) and the
circuit diagrams after modification to comply with the decisions taken during the review (SubB).
Note there are Rev C and D circuits to add to this, due to changes during compliance verification.
FMECA Volume 5: Software and Firmware (568KB)
FMECA covering firmware and software in the Open Revolution rebreathers and rebreather monitors.
This covers both primary FMECA and also correct by construction features to avoid failures from design or programming errors.
FMECA Volume 6: Top Down Rebreather Faults (740KB)
The top down failure modes, including all failures that could create a safety issue during a dive.
This document covers all types of rebreathers, and faults on any rebreather type. Last updated 28th March 2011
Functional Safety
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