Bunkering Tricks
Apr08

Bunkering Tricks

Even though the procedure has been tightened, we may see some bunker tanker are still trying to play their tricks, therefore it is very important for Chief Engineer, Vessel’s Crew and Surveyor to know well their tricks. Below are the Tricks of Bunker Supply, trust that most of our Chief Engineers might known the trick very well, or even know more other tricks. Hopefully by knowing these tricks we can do some prevention, counteract or...

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Negative Constant in Draft Survey
Apr01

Negative Constant in Draft Survey

What is Ship Constant? The ships constant is the difference between a vessels design lightship and it’s actual displacement when empty. The ships constant is determined by a draft survey. The ships constant will vary over the life of the vessel. Unintentional Reasons for Variations – Sedimentation in ballast or fuel oil tanks – Corrosion – Fouling of hull – Coating build-up (paintwork, tank coatings,...

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Tank Sounding Basic
Mar25

Tank Sounding Basic

In this post, I would like to write about how to do tank sounding for ballast water and fuel oil. Sounding Tools: – Sounding Tape, in meter or feet. For Manual measurement of sounding, a measuring tape normally made up of brass and steel with a weighted bob attached at the end of the tape is used. – Water Finder and Oil Finder Pastes. Sounding pastes are also available for both water and gas oil which highlights the level...

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Petroleum Calculation Series: Wedge Formula
Mar07

Petroleum Calculation Series: Wedge Formula

As I have requested by comments to post about Wedge Formula of liquid cargo measurement, herewith the article collected from internet What is Wedge Formula? Wedge Formula is calculation to determine the small quantity of liquid or non liquid cargo (On Board Quantity – OBQ or Remaining On Board – ROB) on cargo tanks, where it should fulfill the following conditions : – The vessel has huge trim, but there is no trim...

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Draft Survey: The Other Side
Oct08

Draft Survey: The Other Side

Distance Draft Mark From Perpendiculars The above picture show you the distance of draft mark to perpendiculars. Some of you may have finds the above arrangement. But how if you find it for the first time? How do you calculate it? Commonly in the table for draft correction, the distance of draft mark measures to the nearest perpendiculars such as; Distance of Aft Draft Mark to Aft Perpendicular, Distance of Mid Draft Mark to Mid...

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