Petroleum Calculation Series: Gas Tanker Terms

Absolute Pressure
The absolute pressure is the total of the gauge pressure plus the pressure of the surrounding atmosphere.

Absolute Temperature
The fundamental temperature scale with its zero at absolute zero and expressed in degrees Kelvin. One degree Kelvin is equal to one degree Celsius or one degree Centigrade. For the purpose of practical calculations in order to convert Celsius to Kelvin add 273. It is normal for the degree Kelvin to be abbreviated in mathematical formulae to ‘K’ with the degree symbol being omitted.

Absolute Zero
The temperature at which the volume of a gas theoretically becomes zero and all thermal motion ceases. It is generally accepted as being -273.16°C.

Activated Alumina
A desiccant (or drying) medium which operates by adsorption of water molecules.

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Updated: Marine Survey Software

seven surveyorRecently, I have updated marine survey software for better performance and assist your fast calculation during surveying. In this version there are some updates includes:
– Clean and Larger interface with simple and easy data input for the survey.
– The software created basis Microsoft Excel files that works best with excel 2007-2013 and it could also working with excel 97-2003.
– The presentation is creates by Microsoft Power Point basis, it totally free to download. All version PP enable to open this.
– Smaller size file and performs faster file access.

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Draft Survey: Barge Overhang Method

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I found this alternative method from draft survey course book, hope it usable. Frankly, I never use this method yet, as we required the barge owners to provide the hydrostatic table for draft survey.

The overhang method use the same principles with the method of calculating the volume of a prism. The weight of the barge will be getting by multiplying the volume with the water density where the barge is afloat. Measure the dimension of the barge, before and after the loading/discharging is required for the length and width of the barge, barge freeboard, overhang aft and fore.

The method is applied when :
– The barge is of cut-up type.
– There is no table or data.
– The concerned parties agree on the use of overhang method for weight determination of barges.

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International Institute of Marine Surveying

marine cargo ship surveyorsAs marine surveyor, you might need organisation to develop your knowledge and experience. Today I will post you one of them called International Institute of Marine Surveying (IIMS). This is an independent, non-political organisation promoting the professionalism, recognition and training of marine surveyors worldwide. The IIMS is held marine surveying training, short courses and distance learning. Right now, the representative office was spread at several countries. Here a brief description about IIMS.

The IIMS is a membership organisation and since 2004 has increased its membership worldwide to cover 98 countries.  It is the largest organisation of its kind in the world, and seeks to represent its industry to government and non governmental organisations such as the International Marine Organisation (IMO), Coastguards, insurance companies and ship owners.
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Cargo: Definition and Terminology

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Air draught – means the vertical distance from the surface of the water to the highest point of the ship’s mast or aerial.

Bale space capacity – is that cubic capacity of a cargo space when the breadth is measured from the inside of the cargo battens (spar ceiling) and the measured depth is from the wood tank top ceiling to the underside of the deck beams. The length is measured from the inside of the fore and aft bulkhead stiffeners.

Broken stowage – is defined as that space between packages which remains unfilled. The percentage that has to be allowed varies with the type of cargo and with the shape of the ship’s hold. It is greatest when large cases are stowed in an end hold or at the turn of a bilge.

Cargo information – means appropriate information relevant to the cargo and its stowage and securing which should specify, in particular, the precautions necessary for the safe carriage of that cargo by sea.

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Basic Calculation for Surveyor

Calculation for Surveyor

After reviewing some comments on the posts, I decided to write this post. Flash back, this post is explains several basic calculation that usually use by marine cargo ship surveyor to complete their jobs. I think this will be usable for beginner.

Vessel Trim Calculation

Trim is different between aft draft and forward draft of the vessel.
Trim = Draft Aft (DA) – Draft Fore (DF)
Example : DF: 5.40 M, and DA: 7.25 M
Trim = 7.45 – 5.40
Trim = 2.05 M (Apparent Trim / AT)
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Draft Survey Software Review

A few weeks ago, I have got the full version of Draft Survey Software, thanks to Capt. Michael from MW Marine Services, LLC that has given me free.

Now, I have time to post the review of Draft Survey software, so the reader could give comment and feedback to software owner for next expansion. This review is based on the software I have tested. Just continue reading to check the below test.

The below screenshot show how the software works:
Fig. 1 – Data to insert for Draft Survey
marine cargo ship surveyors
In this page you should insert the ship particulars and survey data to get access to the next page.

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