Author Archives: Surveyors

Software: Bunker Survey and Petroleum Calculation

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I have added some trial software for your survey references relate to oil calculation. The software are:

1. 7s-BunkerCal (trial software) – Password : 123456
A Bunker Tank Sounding calculation program. Bunker survey calculation for tank sounding report based on Astm Table 54B .
Download available at http://www.box.com/s/xec50bv5mzrln1q0cra1

2. 7s-OilCal-T6.T54 (trial software) – Password : 123456
A Petroleum calculation program. For shipboard survey with calculation and ullage report based on Astm Table 6 and Table 54. Actually the T6 and T54 are in separate software, but I have combine it to save time. The calculation is used for crude oil survey.
Download available at http://www.box.com/s/t4q8rk70vc3yqdulqajq
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Petroleum Calculation Series: Shipboard

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restristed 300x194 Petroleum Calculation Series: Shipboard

Before reading this post, it is suggested to read the previous post – Petroleum Calculation Series: Definition – to become familiar with abbreviation and terms.

The shipboard loading survey is conduted to get the quantity loaded onboard the vessel with measurement of cargo tank. The sounding or ullaging are performed to obtain the level of oil and free water on each tank. The obtained oil level data were calculated by using ship tank table to get TOV and total free water.

Data required for Crude Oil Survey:
- Tank Number
- Tank Reference Height
- Dip innage (sounding) or ullage
- Free water dip (FW)
- Oil temperature (C or F)
- Oil density or API
- BS&W volume in % (as per analysis result)
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Petroleum Calculation Series: Definition

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Ambient Temperature: The temperature of the surrounding medium such as the atmosphere.

API: American Petroleum Institute.
API Gravity (Relative Density): A means used by the petroleum industry to express the density of petroleum liquids. API gravity is measured by a hydrometer instrument having a scale graduated in degrees API.  The relation between API gravity and relative density (formerly called specific gravity) is: API Gravity at 60 Deg. F. = (141.5 : Relative Density 60F/60F) – 131.5

ASTM: American Society for Testing Materials. Grade and quality specifications for petroleum products are determined by ASTM test methods.

Barrel: The standard unit of liquid volume in the petroleum industry. It is equal to 42 U.S. gallons.

BS & W: Bottom sediment and water.

Bunkers: Fuel for a vessel. The type will vary depending upon the propulsion mode of the vessel. Steamships will use a heavy fuel oil, diesels use a range of fuels from heavy to light, and gas turbines generally use kerosene

Cargo Pump: Pump used on tankers for discharging cargo and loading or discharging ballast. Located, at the bottom of the pump room, these pumps are usually of the common duplex type, or turbine type of which the centrifugal is the most common.

Clingage: The residue that adheres to the inside surface of a container, such as a ship’s tank or shore tank, after it has been emptied.

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