Chief Mates/Masters opinions how long it should take to tank clean, purge HC to 2% a 41343 m3 tanker with 6 segregations, doing a cold seawater wash?
You have not given enough information.
- What was your last 3 products and what are you washing for.
- what is the shape and size of tanks
- what is the capacity and number of tank wash machines (what type of machine)
- what is the capacity of IG system
5.Are you washing through ODME or to slop tanks.
- How well were the tanks and pipelines stripped at Discharge port
7.what will be the Temp of your cold water wash. (artic water or tropical) makes a huge difference
I have washed ships of this size in 12 hours or 4 weeks depending on the above factors
Cant be done like you describe. Needs ventilation as well, and you have left out a lot of needed info. You may wash the tanks, with seawater, but getting the HC below 2% must be done with blowing. OH, yeah. The present tank cargo would really be necessary to know whether a hot water wash is needed. The speed that hot water/steam will clean, with less wash water is probably more important nowadays. It is SO expensive to dispose of it, most companies will prefer to go to a tank cleaning plant, and have it done with hot water, versus doing it with cold water and paying for more disposal fees.
I have done 8 tanks (p&s) on a 39k DWT unit in either 4 to 5 days, gas free to chemist certificate safe for hot work, to the same unit, taking two weeks. different crews, (motivation levels) and last crew getting laid off, and selling the vessel!