Quantity Surveys

As the name implies, the purpose of conducting these surveys is to establish the quantity of the cargo which is loaded or discharged from a vessel. The commodity may be of a “wet” or “Dry” nature and in case of the former, volumes and eventual tonnages arrived at go through the process of obtaining the ullage, dip or automatic gauge readings of the ship and shore tanks before and after loading/discharging. The same process applies to a bunker survey before  and after a supply operation or whether the principal’s requirement is simply to be informed of the ROB’s on board at a certain point in time. The latter survey is often called a Bunker Detective Survey or 221B Survey.

Dry commodity cargo quantity calculations often go through draft surveys whereby the displacement of the vessel, by draft readings is calculated before and after loading/discharge after adjustments for consumables or ballasting operations which may have been carried out during the period of cargo operations. Shore scale measurements often used when the cargo travels onto a conveyor belt or weighbridge measurement in case of transportation by trucks are other methods frequently used to calculate dry cargo quantities.

a. Petroleum Survey

 

b. LPG Survey

 

c. Molasses Survey

d. Bitumen Survey

e. Veg Oil Survey

 

f. Bunker Survey

 

g. Draft Survey