Hull Roughness Survey

What is Hull Roughness ?

The roughness of the underwater part of the hull plays an important role in vessel performance. Additional friction drag and resistance caused by roughened coated surface due to fouling, corrosion, pitting and structural alignment will adversely impact the speed and fuel consumption thereby emissions.

How can Hull Roughness be measured ?

Hull Roughness is measured using a Hull Roughness Analyzer before Launching (for NB) to create the baseline, thereafter during docking before paint application and after paint application.This is to be measured over port and starboard side boot topping area, side bottom area and flat bottom area.

What are the areas to be measured ?

Hull Roughness is measured for the underwater part of the Hull.

What is the output client receives after survey ?

After Hull Roughness, Zener will generate a report with AHR to validate the additional frictional drag due to roughness. Additional roughness can be calculated. This can be helpful in evaluating the surface roughness to plot histograms of MHR for comparing surveys before and after re-coating application.

What is the ZENER Advantage?

Hull Roughness Survey will help Ship Owners and Ship Managers to compare the AHR with the baseline and thereby monitor efficiency. Increased hull roughness can cause drag, therefore increases ship resistance which will impact speed and fuel consumption.

Zener team can carry out the service at drydocking before and after coating. Measurements after drydocking will help Owners validate the paint specification achieved by the yard. The service is best started at NB delivery where the Baseline is confirmed and can be used throughout the life of the vessel.

Measurements after the drydocking could help to keep a check on the quality of the work achieved at the shipyard - proper maintenance and correct application of high-end anti-fouling coatings.