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topic 490

Coating materials for geothermal plants (vent gas)

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Q. We are currently searching for candidate coating materials for use in geothermal power plants in Northern California. Of particular concern are the cast steel casings of vent gas blowers which experience severe erosion/corrosion within two years of service. The vent gas is saturated with moisture and has approximately 3-5% H2S, 10-20% H2, 0-20% O2, 5-10% CH4, and 40-60% CO2. There are trace amounts of SO2. Temperature ranges between 170-180° F and flow rate is approximately 1300 cu.ft./min. A small amount of particulate carryover from the plant components upstream contributes to the erosion of the blowers.

Do you know of a product(s) that would perform well in this environment? Should nitriding or perhaps metal spray be considered? If possible, we would prefer to apply the protective coating/ process on-site.

Jim Hanck

Electroless Plating
Mallory & Hajdu


A. Hi, Jim. For "down hole" applications, electroless nickel plating is extremely popular. This application sounds like it is in a quite similar environment. Good luck.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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