1％装载还用考虑自由液面吗？

loading · 发表于 2021-1-17 09:18

FPSO压载舱和货油舱，如果装载1％，或者是无法泵出的残液，是否需要考虑自由液面的修正？有何依据？感谢！

ggfriends · 发表于 2021-1-17 14:04

取决于软件。

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oklai789 · 发表于 2021-1-17 23:13

不用吧，看书本

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wudi888_2000 · 发表于 2021-1-18 08:33

不用吧，看书本

自律即自由 · 发表于 2021-1-18 09:02

应该主要考虑大倾角状态下，回复力矩是否能克服自由液面产生的力矩。个人认为超大型船舶或FPSO
应该要考虑

dragonsky5 · 发表于 2021-1-18 13:00

看规范取一对

feitian5229 · 发表于 2021-1-20 21:38

不用，规范有要求的，大概是10%到90%才要修正

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ecmb · 发表于 2021-1-21 16:48

我觉得你这个问题关键是主管机关认不认定FPSO 是船，要不要求FPSO 满足2008IS CODE 和MARPOL，如果要求，那么就要执行呀。
2008 IS CODE CHAPTER 3 3.1 Effect of free surfaces of liquids in tanks
3.1.2 Free surface effects should be considered whenever the filling level in a tank is less than 98% of full condition. Free surface effects need not be considered where a tank is nominally full, i.e. filling level is 98% or above. Free surface effects for small tanks may be ignored under condition specified in 3.1.12.14
But nominally full cargo tanks should be corrected for free surface effects at 98% filling level. In doing so, the correction to initial metacentric height should be based on the inertia moment of liquid surface at 5° of heeling angle divided by displacement, and the correction to righting lever is suggested to be on the basis of real shifting moment of cargo liquids.
2008 IS CODE ANNEX 1 2.1.1
As the width of the tank increases, the value of free surface moment increases by the third power. The distance available for the liquid to shift is the predominant factor. This is why even the smallest amount of liquid in the bottom of a wide tank or bilge is normally unacceptable and should be removed prior to the inclining experiment.
MARPOL 27条完整稳性也明确说了货物和压载水最恶劣工况要满足完整稳性衡准，所有情况下压载舱假定存在自由液面。