The Future Of Plate Edge Rounding - Blog 1/8 - Introduction

Edwin van Mensvoort
– Updated
Jun 11, 2020

Corrosion protection gained from the effective application and maintenance of coatings is of great importance to the marine industry. The 2008 amendment and adoption to the Safety of Life at Sea (SOLAS) regulations by the International Maritime Organization (IMO) requires the Performance Standard for Protective Coating (PSPC) for specified spaces within ships. This means that the seawater ballast tanks of ships above 500 gross tons and the double-skin spaces of 150m or more length bulk carriers must comply with the coating performance standard. The International Association of Classification Societies Ltd (IACS) made the PSPC mandatory for oil tankers and bulk carriers built under Common Structural Rules (CSR) and contracted on or after 8 December 2006.

The SOLAS regulations were updated on January 1st 2013 (contract date of ship’s new construction) and required crude oil cargo tanks of tankers to be coated according to the PSPC. This increased PSPC regulation for oil tankers is similar to the mandatory rules for dedicated seawater ballast tanks. Shipyards are expected to implement the same or similar production procedures and quality control procedures to meet both PSPC requirements.

To assist the industry, the IACS members developed Unified Interpretations (UIs) of the IMO PSPC, relating to issues such as the maximum recommended erection joint sizes, calculating coating damages and the use of power tooling.

edge rounding edge milling edge preparation

Perfect 2mm edge radius



It is commonly stated that a high percentage (~70%) of all premature coating failures is the result from the improper surface preparation. The primary surface preparation is vital and considered as the foundation of all sequential top coatings. The definition of premature failure is a coating that did not meet the expected service life in an acceptable coating condition. The PSPC goal is to achieve a target useful coating life of 15 years in GOOD coating condition. 


To reach that goal, efforts during early fabrication and construction processes are key. Such efforts include among others: rounding sharp edges, weld treatment and surface preparations such as blasting and painting. Engagements of those
activities further down the construction process commonly see additional costs as a result of time, quality and documentation. The standardization of shipyard new construction processes to meet the PSPC requirements not only has the potential for improving the quality of coating, but also provides an opportunity for better controlling costs during construction and throughout the service life of the vessel.


In summary we can state that these regulations cause some tough challenges for the industry:


  • Keep the working environment safe with increased demands and pressure
  • Gain a big advantage over competitors with improved quality standards
  • Maximize quality control, to prevent premature coating failure
  • Save time and capacity (less need for rework, cleaning and quality control)
  • Search for possibilities to automate the preparation process
  • Increase efficiency through the entire production process

Manual edge grinding


In this blog series we will go further into detail on the challenges and how Kranendonk developed an award-winning edge rounding machine to address them. We understand the issues on the shop floor, thus our Edge Preparation
System automatically adjusts to plate tolerances, making sure the shipyard is always compliant with PSPC regulations.

Although developed especially for the shipbuilding industry, the Edge Preparation System is also applicable in other plate
handling industries. Click here to find out more, or challenge us and send us your request by e-mail:

The Future Of Plate Edge Rounding - Blog 1/8 - Introduction | KRANENDONK


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