Bunkers Calculation Example:
From Maputo Port (Mozambique) to the Suez Canal is about 15 days. Ship has 300 mtons IFO380 and 40 mtons MDO remaining on board (ROB) when ship sailed from Madagascar. From the ship’s summer deadweight (DWT) must be deducted an allowance for bunkers and constant weights calculated to remain on board when sailing from Madagascar to that stage of the voyage. Grain is loaded at Maputo Port by shore equipment. Ship’s gear is not used at loading port. Thus, the ship’s port consumption will not be increased to 2.5 mtons daily, which would be the case if ship’s own gear was used. Discharging at Southampton Port (England) will also be by shore equipment, the ship’s gear is remained idle. We now have an estimated cargo figure and can divide this figure of 25,000 mtons divided by 2,500 mtons which is the daily discharge rate at Southampton Port in order to calculate days for discharge. 25,000/2,500 = 10 days discharge time on SHEX (Sundays Holidays Excluded) terms. Therefore, we add time for margin that is time lost for weekends and holidays. In voyage estimation for SHEX terms, in normal circumstances we multiply with the factor of 1.4 in other words 2 days lost for every 5 worked. 10 days x 1.4 = 14 days on full laytime at Southampton Port (England). Ship has on board 300 mtons IFO380 and 40 mtons MDO remaining on board (ROB) at the commencement of the voyage. These bunkers (fuels) are to be multiplied at $400 for IFO380 and $700 for MDO per mton. Relatively simple to calculate the total voyage bunker requirements. Balance of required bunkers (fuels) 130 mtons IFO380 and 48 mtons MDO should be taken at Suez Canal. Furthermore, in voyage estimation table, disbursements at Maputo Port, Suez Canal and Southampton Port should be entered.