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設(shè)計(jì)計(jì)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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