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# What Is The Average Roughness Of A New Build Hull? Top Answer Update

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Typical Roughness or A.H.R of a ship when it is new is approx 120 microns. Due to fouling and deterioration, an 8 year old ship will have A.H.R in the range of 300-400 microns. The significance of the roughness profile is that increase in the hull roughness will increase the frictional resistance of the ship.The hull roughness is measured during in-docking and out-docking. The Hull Roughness Gauge measures the AHR value (Average Hull Roughness) of sea going vessels. AHR is the ‘mean’ of all the vessel’s hull roughness readings and is the measure against which ship’s performance is correlated.The hull roughness increase is mainly due to the settlement of marine organisms or due to mechanical damages, corrosion etc.

## What is hull roughness?

The hull roughness is measured during in-docking and out-docking. The Hull Roughness Gauge measures the AHR value (Average Hull Roughness) of sea going vessels. AHR is the ‘mean’ of all the vessel’s hull roughness readings and is the measure against which ship’s performance is correlated.

## What is the most significant cause of hull roughness and resulting in reduced speed of ship?

The hull roughness increase is mainly due to the settlement of marine organisms or due to mechanical damages, corrosion etc.

### DC9000 TQC Hull Roughness Analyser

DC9000 TQC Hull Roughness Analyser
DC9000 TQC Hull Roughness Analyser

## How can you reduce the total resistance of your ship?

By improving the flow around the stern of the ship the hull resistance can be reduced. Flow improving devices such as stern flaps can be attached to do the same. The other important thing to be considered while designing the stern is the type of stern whether a transom or a cruiser or an elliptical etc.

## What is the average roughness of a newly polished propeller?

New propellers are typically delivered with a surface roughness in accordance with ISO standard 484. Propellers are delivered to either a Class “S” or Class “I” standard which equates to surface roughness between1. 5 and 6 microns.

## How much speed loss will justify docking?

However, given a typical design, the vessel will have lost one third of the 18 percent efficiency loss in speed. Over a 60-month dry-docking interval at a 75 percent activity level, this results in a potential loss of around 82 trading days or around 38,000 sea miles.

## What is effective horsepower EHP?

EHP – “Effective Horsepower” is the power required to move the ship’s hull at a given speed in the absence of propeller action.

## What is the actual ship speed?

The number of knots passed multiplied by the distance between the knots and divided by 30 seconds told them that 1 knot is equal to 1.852 kilometers per hour or 1 knot is equal to 1 nautical mile per hour. This is how ‘knots’ originated and became a metric system to measure ships speed.

## See some more details on the topic What is the average roughness of a new build Hull? here:

### a fundamental study on measurement of hull roughness

… , representing realistically fouled hull [15]. An experimental study investigated the measurement techniques of hull roughness on a 160 m …

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### Hull Roughness – an overview | ScienceDirect Topics

The surface texture or hull roughness of a vessel is a continuously changing parameter which has a comparatively significant effect on the ship performance.

### Answer Construction Question 12 – MEO CLASS-2 MMD EXAMS

Typical roughness value (AHR, Average Hull Roughness) for a new ship is approximately 120 μm. Since deterioration is around 20 to 40 μm per year, …

### A FUNDAMENTAL STUDY ON MEASUREMENT OF HULL …

Using the measured average hull roughness, we estimated the resistance performance at the design speed of the ship. Accordingly, it was …

## How is squat affected with blockage factor?

The Ship Squat value depends on the ratio of the ship’s cross-section to the cross-section of the river. This is the blockage factor ‘S’. The presence of a second ship meeting and crossing will of course increase the blockage factor. Consequently the squat on each ship will increase.

### Surface Roughness Symbols II Metrology II Surface Roughness Representation

Surface Roughness Symbols II Metrology II Surface Roughness Representation
Surface Roughness Symbols II Metrology II Surface Roughness Representation

## How do you reduce drag on a hull?

Pressure drag reduction could be achieved by the improving the shape of the vessel by application of modern hull forms or hull forms optimization techniques. In general, optimization methods focuses on minimizing the resistance by mainly reducing the wave resistance.

## What is Froude’s law of comparison?

The law of Comparison, or Froude’s law, as it is frequently called, teaches us that certain resistances of ships and models 11t corresponding speeds vary directly as their displacements.

## How many years does a logbook be kept onboard the ship before disposal?

It shall be preserved for a period of three years after the last entry has been made.

## Which method of propeller polishing is normal results in best surface finish?

In-water polishing

The water creates the necessary cooling to achieve a surface finish, which is much finer than can be achieved in a dry environment.

## What is propeller immersion?

The immersion of propeller is defined as the ratio of the distance between free surface and propeller blade tip to propeller diameter, as shown in Figure 1.

## What are the main sources of ship vibration?

So, main engines, propulsion shafts, gearboxes, propellers, pumps, diesel generators– all machinery transmit vibrations. The role of a ship designer is to first understand how each of these machinery causes vibrations and then device methods to keep them within safe levels.

## What is MCR engine?

Maximum Continuous Rating or MCR: It is the maximum power output engine can produce while running continuously at safe limits and conditions. It is specified on the engine nameplate and in the Technical File of the marine diesel engine.

### SURFACE TEXTURE-SURFACE FINISH, ROUGHNESS WAVINESS

SURFACE TEXTURE-SURFACE FINISH, ROUGHNESS WAVINESS
SURFACE TEXTURE-SURFACE FINISH, ROUGHNESS WAVINESS

## What is shaft horsepower?

the horsepower delivered to the driving shaft of an engine, as measured by a torsion meter.

## When should tugs stop pushing the vessel when coming alongside?

Once smoothly alongside tugs will keep on pushing till the vessel is made fast. Both forward and after tugs need to be constantly controlled to keep the vessel absolutely parallel to the jetty.

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