tank ventilation fan

How to renewal the oil tank air pipe which is full of oil;

满油的油舱、油柜如何换新空气管

In large ships,there are many variously shaped oil tanks,in which heating pipelines layout is unlike with each other.

大型水面船舶的油舱众多,形状各异,加热盘管的布置差异很大,仅靠人工计算特别耗时,还容易出错。