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发表于 2007-10-18 16:01
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来自: 日本
1. LNG或LPG有的有IGS,有的没有IGS,用NITROGEN,这里是用瓶子装氮气么?另外,IGS或氮气起什么作用?里面装的不是液态的天然气么,并且有冷却装置,应该不像油船里面装的油那样会挥发。如果不挥发,要惰性气体干什么?还是这些惰性气体在gas freeing的时候用?如果是,在以后装新的液态天然气的时候,tank里面的惰性气体怎么弄到外面去?并且装新的天然气的时候,岸上的天然气是先冷却成液态后通过管子往舱里装,还是直接气态,就往舱里输入,进去了就成液态了?如果是气态的天然气直接输入的舱里,在冷凝成液态时候会放热,这时放出的热怎么被吸收?
--------------I think only when GAS freeing,using IGS.
--------------Loaded with liquilified type.
2. 舱里的温度和压力的维持,主要依靠refrigerator,还是本身的membrane来维持?
---------------压力靠membrane来维持,cooling just for lowering the pressure
3. Secondary barrier是什么?主要起什么作用?他里面的压力和温度是靠什么来维持?
----------first barrier is the membrane,second is the hull
4. Cargo tank leakage detection system,什么原理能探测出leakage?甚至是很小的leakage。
---------------Please trust the dector
5. Portable/fixed drip trays化霜水盘,如何化霜?主要靠水来化霜?
--------------Do you mean the trip under the membrane?
6. Insulation for deck protection in the event of cargo leakage,这里insulation是什么材料?有什么特性?如果货舱真的leak,怎么修补?因为如果漏的话,出来的肯定都是气体,吸收大量的热,会使周围温度降低很多,这时候如果紧急修补?
7. gastightness of wheelhouse doors and windows。这里的门和窗子和一般船上用的weathertight,有什么区别么?要求更高?
--------------gastight is under some pressure, gas can not pass. Generally, watertight is gastight, but weathertight maybe not gastight.
8. Ventilation systems and air locks in working spaces are to be checked for satisfactory operation。这里air locks是什么?
-----Please check DNV rule, air locker is for isolate the safety area with the dangerous area.
9. Reliquefaction/refrigeration equipment如何起到冷却作用?工作原理跟冰箱类似么?
10. Methane burning equipment,好像一些船会烧一些多余的methane做为主机燃料。这些多余的methane怎么弄到equipment里燃烧掉?有没有船是纯用methane做为燃料用来推进?
11. Deck mounted cargo storage tanks是什么,干什么用?
------A tank mounted on the deck for carriage some other cargoes.
12. 在什么紧急情况下需要把货立刻排到岸上?一般怎么discharge?
13. The water end covers of condensers are to be removed for examination of the tubes, tubeplates and covers. 什么是water end covers of condensers?
14. 对于Gas Carrier来说,一般都有什么系统?好像听说有5大系统,能否请知情人士讲一讲? |
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