# Maximum Safe Parameters of Outbound Loaded Vessels for Wind Turbine Installation
## 2 Offshore Wind Turbines and Vessels for Their Installation--Current Status and Development Trends
\begin{tabular}{l l l} \(d_{m}\) & - & Maneuvering component of the lane width; \\ \(d_{n(1-\alpha)}\) & - & Navigation component of the lane width determined at the confidence level \\  & & (1\(-\alpha\)); \\ \(d_{r}^{p},d_{r}^{d}\) & - & Provision for the bank and channel effect of the right and left sides of the \\  & & waterway, respectively. \\ \end{tabular}   
Assuming that the significance level is equal to the permissible probability of crossing the above-water navigation area (\(D_{i}^{\mathit{nad}}\)) by the above-water safe manoeuvring area (\(d_{i}^{\mathit{nad}}\)):  
\[\alpha=p_{i}^{\mathit{nad}} \tag{18}\]  
determining the acceptable safe length of wind turbine blades loaded across the jack-up vessel at the level of accepted acceptable navigational risk,  
\[L_{i}^{\mathit{akc}}=D_{i}^{\mathit{nad}}+B-d_{m}-2d_{n(1-\alpha)}  
* Passage along the Chemikow Quay during berthing of a bulk carrier with width \(B\) = 50 m (1.3 km of track), \(D\) = 198 m, \(D^{\text{n}ad}\) = 266 m (Figure 4). The accident contingency scenarios for the two track sections generating the greatest navigational risk can be characterized as follows:  
**Scenario 1:** Impact of the outgoing jack-up vessel with turbine blades loaded asymmetrically on the starboard side on the moored ferry LOA = 230 m at the modernized ferry stand no. 2. The kinetic energy of impact of this vessel on the ferry is relatively high (\(V\) = 4 \(\div\) 6 knots), which may cause damage to gangways and ramps. The result of such an accident may be the death of a group of passengers. The acceptable risk of such an accident should be taken as equal:  
* \(R_{\text{n}ac\text{I}}\) = 1 \(\times\) 10\({}^{-6}\) (1/year). **Scenario 2:** Impact of an outbound jack-up vessel with its blades asymmetrically loaded on the starboard side on a moored bulk carrier with a width of \(B\) = 50 m at the Chemikow Quay. The kinetic energy of the impact of this ship against the bulk carrier (at a speed of 4 \(\div\) 6 knots) may cause damage to the wind turbine blades, the jack-up vessel, and the bulk carrier. The acceptable risk of such an accident should be taken as equal:  
Figure 5: Available navigation area, Chemików Quay. \(R_{\text{n}k2}\) = 1 \(\times\) 10\({}^{-3}\) (year\({}^{-1}\))  
Assuming the predicted average annual number of jack-up vessel maneuvers from Swinoujscie port as equal to \(I_{r}\) = 20, the calculation significance levels for both scenarios were determined:  
\(\bullet\)\(\alpha_{1}\) = 1.852 \(\times\) 10\({}^{-5}\),  
\(\bullet\)\(\alpha_{1}\) = 1.852 \(\times\) 10\({}^{-2}\),  
and the corresponding navigational components--the widths of the safe maneuvering area [26]:  
\(\bullet\)\(d_{n(1-\alpha 1)}\approx\) 10 m,  
\(\bullet\)\(d_{n(1-\alpha 2)}\approx\) m.  
The permissible safe lengths of wind turbine blades loaded across the jack-up vessel leaving the port of Swinoujscie are, respectively:  
\(L_{1}^{\text{n}kc}\approx\) 170 m (at \(R_{\text{n}kc}=1\times 10^{-6}\));  
\(L_{2}^{\text{n}kc}\approx\) 140 m (at \(R_{\text{n}kc}=1\times 10^{-3}\)). When calculating the safe blade lengths, the basic maneuvering component \(d_{m}\) = 1.3B (very good ship steering) and \(d_{r}\) = 0.1B (ship speed 4 \(\div\) 6 knots) were assumed. Detailed results for determining the acceptable safe lengths of wind turbine blades loaded across the jack-up vessel leaving the port of Swinoujscie are presented in Table 1.