SAFETY AND ENVIRONMENTAL RISK AND RELIBIALITY MODELING PROCESS
173
Appendix 5: HAZOP No Guideword
1 No Pitch 2 No blade
Description
No rotational energy is transformed
No rotational energy is transformed
3 No control bar 4 No crank wheel
5 NOT enough material strength
All blade on random pitch, loss of operational control
On all blade have independent pitch
Causes
operation , control mechanism, alignment failure
Object in the water break the blade
material weakness material weakness
part of propeller breakdown wrong design, corrosion or cavitations, alignment different pitch, extra load on bearing
6 MORE pitch than optimal 7 8 9 LESS pitch than optimal LESS draft than allowed LESS depth than necessary
Too heavy load on propulsion system. Cavitations
Too little load on propulsion system. Cavitations
Propeller I not sufficiently submerged. Loss of Thrust
Propeller hit the ground and it is damaged
operation failure operation failure operation failure operation failure
Safety measure address by 2, 3, 4, 5
implementation of propeller protection such as grating jet, sail in ice free water, +7& 9
improve design and construction
improve design and construction
validate propeller design, catholic protection, appropriate propeller material, test the propeller against cavitations periodic alignment adjustment
surveillance, increase operator competency
surveillance, increase operator competency
surveillance, increase operator competency
technical equipment, surveillance, increase operator competency
Journal of Marine Environmental Engineering
145-173 pp MB_37(Kader)
2.indd 173
2/19/2010 11:04:29 AM
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