Experts in Corrosion, Metallurgy and Engineering
POWER CORROSION (CONSULTANTS) LTD
Ashby de la Zouch
Tel: +44(0)1530 412418
Last Updated: 09-Mar-17
These will occur in condenser tubes and on tube plates if the cooling water is not correctly chemically conditioned. We investigated this incident and advised that the circulated water had been at too low pH.
Cupro-nickel condenser tubes were pitted by deposits on the cooling water side. We advised on the required maintenance of the condenser waterside to protect against deposition and corrosion.
Cupro-nickel and brass condenser tubes require a period of exposure to a steady flow of clean aerated seawater to form a passive layer to resist corrosion. This condenser was fitted with sacrificial anodes fabricated in the wrong material. The passivation process failed local to the anodes and corrosion initiated
It is good practice to epoxy coat the tube plates of condensers. This will protect against general corrosion, galvanic corrosion, erosion-corrosion and particle erosion. It is important that the correct epoxy formulation is used and suitably applied. We can advise on this.