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3.0  FLEET DATABASES

3.1 Canadian Tug Fleet

• Total number of tugs (> 10 metres length) = 412
  
  
• More than half of the tugs registered in BC are under 15 GRT
  
  
• More than two-thirds of the BC tug fleet is under 15 metres in length
  
  
• More than half of the BC tug fleet has less than 500 bhp
  
  
• The majority of the BC tug fleet is more than 30 years old, and many are more than 50 years old

3.2 USA Tug Fleet

• The total number of tugs in the US west coast fleet is 534 (2000)
  
  
• The distribution of tugs by length is much more "normal" in the US than in Canada, but is still skewed predominantly to smaller vessels in the 15-25 metre range
  
  
• There are many more larger tugs (> 30 metres) in the USA than in Canada

3.3 Fleet Comparisons

• Due to extreme differences in Tonnage Measurement systems between Canada and the USA, a direct comparison between GRT in the two countries cannot be made. An analysis of the actual volume of the tug fleets by Cubic Number (Nc) indicates that:
  
  

  - GRT (Canada) = approx. 1.5 GRT (US)
  
  

• The Power/Size ratio of Canadian tugs is much higher than the US counterparts, as witnessed by the following analysis results:
  
  

  - Canada    - Power = 1.958 x N_C + 304 (fleet average)
  

  - USA         - Power = 0.295 x N_C + 44 (fleet average)
  
  

• The Power/Length ratio of Canadian tugs is broadly linear, with high randomness:
  
  

  - Power = (95.3 x Length) - 597
  
  

• The Power/Length ratio of US tugs is much more parabolic, but again with high scatter:
  
  

  - Power = 127.25 x e ^{(0.1002 x L)}

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