MARICO Marine NZ Limited WELLINGTON HARBOUR PORT AND ...

More documents

Recommendations

Info

Report No: 05NZ104 WELLINGTON HARBOUR Issue: Issue 1.1 Operational Risk Assessment be mustered reasonably quickly and provide a combined bollard pull of around 48 tonnes, but this is unlikely to be used at one end of a vessel24. In berthing vessels in winds at the container terminal and Aotea quay, pilots use the wind shear off a vessel’s hull to provide loading to assist the vessel coming alongside (or departing) the wharf. This is possible because the berth is laid out almost in parallel with the prevailing wind (this is from the northerly quadrant around 60% of the time). However if such a manoeuvre got out of control in high wind speed, the port simply does not have the tug power to manage the load created on a high winded vessel, beam on in extreme wind conditions (conditions that regularly occur). Table 5, below, shows recommended bollard pull in tonnes to manoeuvre different vessels in increasing windspeed. At working Draught Windage (m 2 ) Beam wind 15 knots Recommended Tug Bollard Pull Required Beam wind 25 knots Beam wind 30 knots Beam wind 40 knots Beam wind 50knots PCC 199m 5,000 22 67 104 185 289 PCC 175m 4,000 18 34 68 122 130 Large Passenger 280m Passenger 220m >10,000 50 110 160 300 450 5,300 23 45 65 115 180 RoRo 180m 4,100 19 35 72 126 135 Table 5: Windspeed Affect on Bollard Pull Required for Differing Vessels CentrePort has evolved a speciality for RoRo car carriers, which are getting larger. Car Carriers are designed to berth starboard side to, resulting in a difficult downwind manoeuvre to berth a vessel. At time of finalising the risk assessment, the largest RoRo to be handled at Wellington to date was programmed25. In most ports, having limited tug power can almost be a “so what”, because the net affect is that it takes longer to berth and depart. However, limited tug power also requires recommended limits on moving in wind speeds that overcome the ability to control the vessel. In the case of Wellington, this can happen rapidly and relatively frequently. 24 During last cruise season a cruise vessel (SAPPHIRE PRINCESS) operated without bow thrusters and two tugs were utilised in a forward position. 25 This RoRo Car Carrier is 200m in length, with associated high windage and represents a vessel type set to visit Wellington regularly. Greater Wellington Regional Council / CentrePort Ltd Page 63 of 102
Report No: 05NZ104 WELLINGTON HARBOUR Issue: Issue 1.1 Operational Risk Assessment The available bollard pull to vessel GT ratio has been falling over the years as larger vessels trade to the port. Unless CentrePort accepts windage load limitations on the large vessels it is handling, it simply cannot and should not put off replacement tug procurement much longer. At 35 years of age, procurement of original spares is becoming difficult. A recommended solution is made against the risk profile in section 13.3. Greater Wellington Regional Council / CentrePort Ltd Page 64 of 102
Page 1 and 2:
WELLINGTON HARBOUR PORT AND HARBOUR
Page 3 and 4:
Report No: 05NZ104 WELLINGTON HARBO
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20: Report No: 05NZ104 WELLINGTON HARBO
Page 69: Report No: 05NZ104 WELLINGTON HARBO
Page 73 and 74: Rank No. Hazard Reference Report No
Page 75 and 76: Rank No. Hazard Reference 24 2 Repo
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
show all

MARICO Marine NZ Limited WELLINGTON HARBOUR PORT AND ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?