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IMO Stability Rules for Tugs - Coggle Diagram
IMO Stability Rules for Tugs
International Code on Intact Stability 2008 (2008 IS Code)
start from Jan/2020
ships above 24m
below 24m
not bound to rule
but tugs usually comply
3 Classification of Tugs
Harbour Towage
within sheltered areas
Coastal or Ocean-Going
assist outside sheltered waters
forces associated
with tug`s BP
Escort
tasks
Steering
Breaking
Controlling
Forces generated
by hydro forces
2 Girting Situations
Self-Tripping
Overturn itself
due to
heeling couple
Towline force
Propeller force
Tow-Tripping
veer-off
due to loss of propulsion
loss of steering
Stability Criteria (harbour, coastal or ocen-going)
For Self-tripping
Available energy to right tug (restoring energy)
greater than or equal to
Available energy to heel tug
For Tow-tripping
test - pulled laterally with 5 kt
when heeling arm same as righting arm
heeling angle less than
angle of down flooding
Stability Criteria (escorting)
Max static heeling
15°
Mandatory
quick release system