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Assessment: Bollard Pull

13 Aprile 2022

|By Maurizio Garipoli

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Domanda 1 of 5

1. Domanda

Define the Bollard Pull

The Bollard Pull is the most used measure to indicate the push force in metric tons or kilonewtons of a tugboat
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The Bollard Pull is the most used measure to indicate the pull force in metric tons or kilonewtons of a tugboat
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The Bollard Pull is the most used measure to indicate the speed in knots of a tugboat
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2. Domanda

How is the BP determined?

To determine this, one end of the towline is fixed to a suitable bollard, and the tug gradually pulls
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By a dynamometer measures the force exerted
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Both the answers are correct.
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3. Domanda

Why will the exerted Bollard Pull never be the theoretical one?

Because we have also – and not only – to consider ship's and tug's speed
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Because we have – and not only – to consider weather conditions and reflected waves
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Both of the above answers are correct
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4. Domanda

Is it always necessary to calculate the tug’s Bollard Pull before a manoeuvre?

These calculations are rarely necessary since the Bollard Pulls of the available tugs are known values, and – in case of doubt – it is sufficient to ask the tug master in assistance directly
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Yes, because otherwise, we are missing a fundamental element
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No, it is useless data for the manoeuvre
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5. Domanda

Define BHp

BHP means Brake Horsepower. It measures the Hp of an engine considering the loss in power caused by propeller
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BHP means Brake Horsepower. It measures the tug' wake power
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BHP means Brake Horsepower. It measures the Hp of an engine without considering the loss in power caused by some engine parts
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