• Integrity surveys
• Risk based asset management of facilities
• Complete turnkey solution to the widespread problem of ALWC

Why use iicorr:

ALWC - the problem and how to solve it:

In recent years, corrosion in seawater piling systems has become apparent due to a phenomenon commonly known as Accelerated Low Water Corrosion (ALWC). iicorr, formerly known as CorrOcean Ltd, is generally accepted by the industry as a leader in corrosion technology, has specialised in this field and have developed a low cost solution based on traditional corrosion protection systems. This is a complete turnkey operation, from initial site surveys to supply, installation and site supervision.

This type of corrosion has been noted usually to occur on submerged steel surfaces below the tidal low water mark, and has become a recurring problem for many port management authorities worldwide. The problem is usually due to growth of bacterial colonies, which adhere to the metal surface. These colonies can cause problems due to the corrosive, chemical and electrochemical processes that occur as they metabolise.

Existence of these colonies is confirmed by the presence of soft orange coloured (sulphurous) deposits, which if wiped away reveal a layer of black slime (iron sulphide), bright shiny pits are observed under this layer. As these pits deepen, through-wall corrosion of the metal can occur, ultimately resulting in the integrity of the structure being compromised and a costly repair exercise ensuring.

Accelerated Low Water Corrosion (ALWC) can reduce the design life of marine structures by as much as two thirds. ALWC is difficult to detect but essential to combat and protect against.

The new CIRIA report Management of Accelerated Low Water Corrosion in Steel Maritime Structures (C634) tells you how to spot it and carry out repairs. The guide also includes information on protection for the future and the building of new structures.