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The principle of Draft Survey for ships is a method to measure the ship's cargo weight based on the changes in the ship's draft. It is typically conducted before loading and after unloading to determine the net weight of the cargo and the ship's displacement. Here are the basic steps involved in the principle of Draft Survey for ships:

1.Prior to loading or unloading, the ship's light draft is measured. This is the draft of the ship when it is empty, without any cargo.

2.Then, the loading or unloading process begins, during which the ship's load gradually increases or decreases.

3.Throughout the loading or unloading process, regular measurements of the ship's draft are taken. This is typically done using draft gauges or draft marks. Draft refers to the vertical distance from the ship's waterline to the hull.

4.When measuring the draft, the ship's trim and stability need to be considered. The ship may have a list or trim due to uneven cargo distribution or other factors.

5.Once the loading or unloading process is completed, a final measurement of the ship's draft is taken. This is the draft of the ship when it is fully loaded or completely unloaded.

6.Based on the difference between the ship's light draft and the draft at full load or empty condition, the change in draft is calculated.

7.Using the change in draft and the ship's hull form data, the ship's displacement is calculated. Displacement refers to the volume and weight of water displaced by the ship.

The principle of Draft Survey for ships is based on the changes in the ship's volume and weight as it displaces water. By measuring the changes in draft, the ship's displacement and the net weight of the cargo can be calculated. This is crucial for cargo management, load planning, and assessing the ship's carrying capacity.

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In the process of fueling a vessel, accurate measurement is critical to ensure that the correct amount of fuel is being transferred and that the vessel remains safe and stable. Some key measurement points to consider during the fueling process include:

*Density measurement: Fuel density affects the volume of fuel that is transferred during the fueling process. To ensure accurate measurements, density should be measured both before and after the fuel is transferred.
*Flow measurement: Flow meters are used to measure the amount of fuel that is transferred during the fueling process. These meters should be calibrated regularly to ensure accurate measurements.
*Tank level measurement: It is important to monitor the level of fuel in the tanks during the fueling process to prevent overfilling and ensure that the tanks are not damaged.
*Temperature measurement: Fuel volume is also affected by temperature, so it is important to measure the temperature of the fuel both before and after transfer to ensure accurate measurements.

In summary, accurate measurement is critical during the fueling process to ensure that the correct amount of fuel is transferred safely and efficiently. Density, flow, tank level, and temperature are all important measurement points to consider.

This is our business scope, but not limited to this, you have business in China can contact us, we will give you the best service

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Our business scope and offer can be found as follows but not limited to these:

- General Cargo measurement Survey

- Pre-loading survey

- On / Off Hire Bunker / Condition Survey

- Bunker ROB Survey

- Bunkering Quantity and/or Sampling Survey

Looking forward to having your inquiry and be of service for you in near future.

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Off hire bunker survey by marine surveyor of Marine Service company.

We can cover all port in china🇨🇳

Best Regards

Tony Zou

——————————————

Marketing Executive

Themis Shipping Service Co., Ltd
青岛禾美进出口商品检验鉴定有限公司
MP:+86 186 5322 8215
TEL:+86 532 6608 1869
FAX:+86 532 6608 1869
Email: [email protected]（Public）
Email:[email protected]（personal）

Loading survey by marine surveyor of themis service.
We can cover all port in china.
pls follow me if you have business in china.

Best Regards

Tony Zou

——————————————

Marketing Executive

Themis Shipping Service Co., Ltd
青岛禾美进出口商品检验鉴定有限公司
MP:+86 186 5322 8215
TEL:+86 532 6608 1869
FAX:+86 532 6608 1869
Email: [email protected]（Public）
Email:[email protected]（personal）