20. PONDTEMP

To calculate the weight of liquid cargoes loaded on board (CRUDE OILS, FUEL OILS, LUBRICATING OILS and OTHER PRODUCTS),are used ASTM tables. It is important to obtain from each cargo tank the Liquid Volume and also the temperature.
For each cargo tank, the observed volume will be converted at 15° Celsius if the density at 15° C. is used or at 60° Far. if specific gravity 60/60 or API 60/60 are used.

In a tanker with 36 cargo tanks this operation becames very painful and also many decimal errors can carry back an error of about 20 metric tons or more depending of the type of interpolation used.
To avoid said errors this program calculates the weight volume and also the weight temperature i.e. will calculate only one volume and only one temperature and also ASTM tables are used only one time. This method is very simple and you can use to check the calculation effected by using tank by tank method.

This calculation is also used on board if different cargoes are loaded on board with different densities or different API. Many times the master is instructed to mix different grades of cargo loaded and calculate the weight of mingled cargo.
This program is the only way to effect said type of calculation.