設計計算書
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- I. General
The design of the crane complies with the following rules:
1) API-2C “Specification For Offshore Pedestal Mounted Cranes (2004)”
2) ABS “Guide for Certification of Lifting Appliance (2007)”
3) API-9A “Specification for Wire Ropes”
4) AWS D1.1 “Structural Welding Code—Steel”
5) AISC “Manual of Steel Construction—Allowable Stress Design, 9th Edition”
II. Main Technical Parameters
Main Hook Whip hook
SWL/Working radius Please see load capacity curve of general drawing
Hoisting Speed Full load ~18m/min ~67m/min
Hoisting Height 95m 100m
Slewing speed 0~0.85r/min
Slewing angle >360º
Luffing angle 15º～82º
Luffing time ~180s
Stowing angle for boom -5º~15º
Working sea state Grade 4~5
Electric motor
Type Y400M1-4-H Y355M-4-H
Power 400kW 250kW
Speed 1790r/min 1790r/min
Source AC440V, 60Hz, 3Ph
Working duty S1
III. Vertical dynamic coefficient calculation
1) Calculation of dynamic coefficient for onboard lifts of main hook by “ General method”:
Dynamic coefficient for onboard lifts:
CV0=1.33+0.0012HsigHsig=1.33+0.0012×6.892=1.39<1.40
There: Hsig—Sea significant wave height, for sea state of grade 4~5,
Hsig=2.1m=6.89ft
So take CV0=1.40
2) Calculation of dynamic coefficient for offboard lifts of main hook by “ General method”:
Vertical velocity of the supply boat deck supporting the load:
Vd=0.6Hsig=0.6×6.89=4.13ft/s
Vertical velocity of the crane boom tip due to crane base motion:
Vc=0.05HsigHsig=0.05×6.892=2.37ft/s
Actual steady hoisting velocity for the SWL to be lifted: Vh=18m/min=0.98ft/s
Relative velocity: Vr=Vh+(Vd2+Vc2)0.5=0.98+(4.132+2.372)0.5=5.74ft/s
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