Press Releases

ECOSHIELD® durable, cavitation-damage-proof rudder protection launched
2013-08-26
ECOSHIELD® durable, cavitation-damage-proof rudder protection launched

Until now, the problem of cavitation damage to rudders, causing erosion, pitting and sometimes complete failure, necessitating very expensive repairs or replacement has remained unsolved. The need for repair to rudders, involving welding and resurfacing in drydock has been almost universal. The cost of rudder maintenance and the safety hazards connected with worn and failing rudders are out of proportion to the relatively small surface area involved. Efforts to solve this problem have taken the form of redesigning the rudder, changing its position relative to the propeller, trying various materials including stainless steel, metal facing the surface, cathodic protection and a variety of coatings. But the problem has persisted.

Now a very durable, tough, long-lasting glassflake resin coating is putting an end to these problems. Ecoshield is a specifically reinforced version of the well-known Ecospeed non-toxic underwater ship hull coating which is designed for the entire underwater hull of any ship or boat. Small but significant variations of the Ecospeed formula have been tested on rudders since 2002 with extraordinary results. Ships that were experiencing heavy cavitation damage to their rudders, once the glassflake coating was applied, have seen no further cavitation damage erosion for as long as 10 years after application, with no sign that the coating will need replacement during the life of the ship.

Ecoshield is designed to be applied at newbuild (best) or in drydock for ships already in service. Application is simple. It requires blasting to create a 75µm profile and a surface preparation of SA 2.5 or SP 10 and then the glassflake paint is applied in two coats to a thickness of at least 1000 µm DFT, with an overspray time of about 3 hours minimum and no maximum. A pitted rudder can be repaired using a thick resin paste (a new, soon-to-be-announced product) which is capable of building up the pitted surface to its original form and which is as tough or tougher than the steel it is used to fill. The heavy glass content of Ecoshield insulates the rudder or other part, making cathodic protection systems including sacrificial anodes virtually unnecessary, as evidenced by the very little wear on the anodes when a ship’s rudder, coated in this way, is inspected in dry-dock and by the fact that an impressed current can be turned right down with no ill effect.

Evidence of the success of the new product is the number of companies who began by coating one rudder experimentally and who, after seeing the results in service, have ordered this coating for the rudders on other ships with plans to convert their entire fleet. Shipowners who have previously applied Ecospeed to rudders on ships in service are specifying the coating for the rudders and other underwater gear on their newbuilds.

Ecoshield comes with a ten year guarantee. It is the only coating known to fully protect a rudder from all cavitation damage.

Ecoshield is available from Subsea Industries.

A White Paper with full details about protecting rudders from cavitation damage is available in the Publications/Papers section of www.shiphullperformance.org for free download.

 

 

 

 

 

 

Registration - Create your free account

Close X
This e-mail address is already registered
Password must be at least 4 characters
Thank you for your registration, check your inbox to continue.
Thank you for your registration, you can now login.
First name
Last name
Company or organisation
Position or post title
E-mail address
Confirm E-mail address
Password
Confirm Password
Address line1
Address line2
Address line3
City
Postal code
State or province
Country

Subscriptions and preferences

I would like to receive the following automatically when published. I understand that these publications are all free including free postage and that there are no obligations attached to receiving these:

Please check at least one of the boxes below before continuing (choose all that apply) *

I prefer to receive information from ShipHullPerformance.org as follows: (Please check all that apply. If you wish both electronic and printed copies, simply check both checkboxes and make sure you have given us your full mailing address.)

Member login

Close X


Forgot password?

Close X