Norimax Cathodic Protection

ISO-9001:2008 Certificate no: KLR 0500421

Introduction to Norimax Cathodic Protection services

    • Norimax offers the full range of cathodic protection products and services such as sacrifical anodes ( aluminium, zinc and magnesium anodes ), impressed current equipment ( transformer-rectifiers, platinised-titanium anodes, mixed metal oxide anodes, silicon-iron anodes, junction-boxes, electrical cables, bond-boxes, and cadwelds ), DCVG, CIPS, Soil Resistivity Surveys, Current Interruption Tests, Interference Testing, etc.

    • Norimax corrosion engineers offer cathodic protection engineering design capabilities to perform detailed engineering designs for new and upgrading CP systems for onshore & offshore oil & gas facilities, pipelines, marine facilities, ships, tanks, and bridges.

    • Norimax corrosion engineers are certified NACE Corrosion Specialists, IMM Cathodic Protection Specialists, UK-registered Chartered Engineers, Malaysian-registered Professional Engineers, and UK-registered Chartered Environmentalist.

    • Norimax manufactures sacrificial aluminium and zinc anodes up to 500 kg (aluminium) and 1000 kg (zinc) in size for offshore oil-rigs and submarine pipelines, and smaller sizes for tanks, jetties, and ships.

    • Norimax offer turnkey design, supply, installation, testing & commissioning of sacrificial and impressed current CP systems

    • Norimax offers specialist services for design and supply of CP Retrofit systems.

Licenses and approvals

    • Norimax is licensed by PETRONAS for the supply of sacrificial anodes and cathodic protection systems.

    • Norimax has been audited and approved by Shell Global Solutions International as anode manufacturer for both shallow water and deepwater cathodic protection systems.

    • Norimax is recognized by all oil & gas operators in Malaysia as a leading Cathodic Protection Specialist.

What is Corrosion?

The deterioration or degradation of materials , usually metals because of a reaction with its environment.

How CP Works?

    • All metal surfaces contain anodic and cathodic sites. In the presence of a conductive electrolyte, direct current will flow from the anodic surface (ANODE) to the cathodic surface (CATHODES).

    • The anodic surface always corrode while the cathodic surface does not corrode.

Codes of standard

BS 7361 Part 1:1991 : Cathodic Protection : Code of Practice for Land and Marine Application

NACE RP – 0169 – 96 : Recommended Practice for Cathodic Protection for Buried Submerged Structures.

NACE RP – 01-76 : Control of Corrosion in Steel Fixed Offshore Platforms Associated With Petroleum Product

AS 2239 : Galvanic (Sacrificial) Anodes for Cathodic Protection

DNV RP B401 : Veritas Offshore Standards Cathodic Protection


The NACE Standard RP0169-96 Section 6.2 provides a list of criteria for cathodic protection which indicate that adequate cathodic protection has been achieved on the structure. The criteria stated in NACE RP0169-96 is :

A negative cathodic potential of at least 800mV with the cathodic protection applied, this potential is measured with respect to a saturated Silver/Silver Chloride (Ag/AgCl) reference electrode contacting the electrolyte.

"This criteria means that the ‘ON’ potential should be -800mV or more negative with respect to Ag/AgCl referene cell."

Cathodic Protection can be achieved by:

a) Galvanic Method (Sacrificial Anodes)

b) Impressed Current Method

Galvanic Method (Sacrificial Anodes)

Galvanic anode system employs metal alloys more reactive than steel. When these anodic metal alloys (magnesium, aluminium or zinc) are directly and electrically conne cted to the steel (cathode) and submerged (underground or underwater) a D.C current flows from the anode to the cathode.

Sacrificial Aluminium Anode

Sacrificial Zinc Anode

Sacrificial Magnesium Anode

Engineering Design, Supply, Installation, Testing & Commissioning of Cathodic Protection Systems

How ICCP System Operates?

Unlike the galvanic anode system, ICCP system needs a “current energizer”.

Transformer Rectifiers energizes D.C current from inert anodes to the steel cathode across a conductive electrode.

Remember: C.P cannot work without electrolyte!

Transformer Rectifier

Current interrupter

Test Post

ICCP Anode Installation

Cable Marker

ICCP anode installation

Cable laying

Reference Cell

For on-shore soil application

Reference Cell For underwater application


Cathodic Protection Survey

Corrosion Investigation

Direct Current Voltage Gradient

Corrosion In Concrete Structures

Close Interval Potential Survey

Corrosion Mapping