Menu
Search
Filters
Close
Menu

Cathodic Protection Of Mooring Chain In Offshore Environment

Picture for Cathodic Protection Of Mooring Chain In Offshore Environment
Available for download

Corrosion in Mooring systems for permanently moored floating production units has been identified as a problem area by authorities as well as industry. A Joint Industry Project (JIP) initiated by the Bureau of Safety and Environmental Enforcement (BSEE) with participation from major global oil and gas operators as well as equipment suppliers was established in 2014 to review the problem area. 1 Studies performed as a part of this program have shown that especially mooring chains located in tropical waters have shown signs of rapid corrosion, both general and localized with corrosion rates significantly larger than those specified in design standards. Increased corrosion allowance, as well as increased inspection requirements, have been recommended and corrosion has been reported as the leading cause for pre-emptive replacement of mooring.

Product Number: 51322-17722-SG
Author: Faisal Shahzad, Nils Olav Digre, Kristian Varne
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
$0.00
$20.00
$20.00

Mooring chains for permanently moored structures – including FPSOs - have shown rapid corrosion of the chain in warm waters. Cathodic protection of mooring lines is normally not provided due to the discontinuous nature of chain links and installation constraints. In recent years, corrosion allowance and pre-emptive replacements of mooring systems are the most common solutions against this corrosion phenomenon.

This study addressed CP of mooring lines with ROV installable clamp anode design. The study is divided into three different sections to examine possible issues and constraints. Including, 1) Mechanical & Electrical properties testing to examine function and continuity between clamp and chain links and between chain links. 2) Development of a computer-based CP model of the mooring chain to simulate CP attenuation with realistic contact resistances between chain links. 3) Sea trials using a section of mooring chain to measure actual contact resistances between chain links and the polarization level of mooring chain links with a single Al anode.

The test results indicate that the subject technology could support new and retrofit CP designs via ROV installable CP System, enhance the operational lifetime of the mooring chains and be beneficial for all other marine and offshore assets.

Mooring chains for permanently moored structures – including FPSOs - have shown rapid corrosion of the chain in warm waters. Cathodic protection of mooring lines is normally not provided due to the discontinuous nature of chain links and installation constraints. In recent years, corrosion allowance and pre-emptive replacements of mooring systems are the most common solutions against this corrosion phenomenon.

This study addressed CP of mooring lines with ROV installable clamp anode design. The study is divided into three different sections to examine possible issues and constraints. Including, 1) Mechanical & Electrical properties testing to examine function and continuity between clamp and chain links and between chain links. 2) Development of a computer-based CP model of the mooring chain to simulate CP attenuation with realistic contact resistances between chain links. 3) Sea trials using a section of mooring chain to measure actual contact resistances between chain links and the polarization level of mooring chain links with a single Al anode.

The test results indicate that the subject technology could support new and retrofit CP designs via ROV installable CP System, enhance the operational lifetime of the mooring chains and be beneficial for all other marine and offshore assets.

Product tags
Also Purchased
Picture for Closed Loop Corrosion Control: Case Studies Of A Reliable, Robust, & Sustainable Treatment Program
Available for download

Closed Loop Corrosion Control: Case Studies Of A Reliable, Robust, & Sustainable Treatment Program

Product Number: 51322-17723-SG
Author: Michael P. Weberski Jr., Claire Rayner, Dan Meier, Renate Ruitenberg, Bingzhi Chen, Sai Sudhakaran, Steef Vrijhoeven
Publication Date: 2022
$20.00

An emerging market driver in industrial water treatment is the move to more sustainable chemistries. Corporate sustainability goals are becoming more common and more stringent. Customers are turning to water treatment companies for innovative solutions that can satisfy their sustainability goals and not sacrifice performance or asset integrity. Indeed, a major trend in evaporative open cooling water treatment is to move away from heavy metals such as zinc and other environmentally questionable materials such as phosphates. Another area of cooling water that is in need of a sustainability refresh is closed cooling loops. The most widespread closed cooling treatment programs are based on combinations of nitrite, molybdate, and borate. All three of these chemicals have regulatory, discharge and/or SH&E concerns.
Picture for Characterization And Further Development Of Austenitic Stainless Steel UNS S20910 Towards New Industrial Applications
Available for download

Characterization And Further Development Of Austenitic Stainless Steel UNS S20910 Towards New Industrial Applications

Product Number: 51322-17648-SG
Author: Clara Herrera, Merlin Seifert, Helmuth Sarmiento Klapper, Julia Ditmann
Publication Date: 2022
$20.00

UNS S209101, also known as XM-19 by ASTM A2762, is a nitrogen-strengthened austenitic stainless steel with high strength and excellent corrosion resistance. Besides nitrogen (N) it also contains higher amounts of chromium (Cr), nickel (Ni), manganese (Mn), and a similar molybdenum (Mo) content compared with UNS S31603, as well as small additions of niobium (Nb) and vanadium (V). High contents of Cr, Mo and N confer this stainless steel high localized corrosion resistance. Mo, Mn and Cr increase the nitrogen solubility in iron alloys.
CFRP Reinforcement Anode For Cathodic Protection Of Steel Rebar
Available for download

CFRP Reinforcement Anode For Cathodic Protection Of Steel Rebar

Product Number: 51322-17877-SG
Author: Xavier Hallopeau, Olivier Lesieutre, Camille Annede-Villeau
Publication Date: 2022
$20.00

Only a few researchers have studied the effect of carbon fiber repair on corrosion processes. The main protective effect is the "protective barrier" which is sometimes called passive protection against corrosion, comparable to some techniques such as anticorrosion coatings of concrete structures. Indeed, CFRP materials, applied as external reinforcing material on reinforced concrete structures form a protective barrier against the penetration of moisture and pollutants such as chlorides or carbon dioxide.1.2.3.4.5 Apart from this impermeable barrier action, it has been found in these studies that the confinement of CFRP concrete has a positive influence on the onset of corrosion and on its velocity. Very little research has investigated the coupling between mechanical reinforcement and impressed current system.6,7,8 
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support