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Electroless Nickel Plating for wet sour service

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Current postings:

"Electroless Plating"
by Mallory & Hajdu
from Abe Books
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June 2, 2022

Q. @ NAVED MAHDI: SO HAVE YOU USED ENP COATED BALL VALVES IN SOUR SERVICE? CLIENT ACCEPTED? DID YOU FACE ANY ISSUE? AS WE ALSO WANT TO USE ENP COATED BALL VALVE FOR SOUR SERVICE. APPRECIATE YOUR REPLY.

AAD DANI
- Singapore
^




Closely related Q&A's, oldest first:

"Chemical (Electroless) Nickel Plating"
by G. G. Gawrilov
from Abe Books
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"Electroless Nickel Plating"
by Wolfgang Riedel
from Abe Books
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2006

Q. We are a job shop working closely with electroless nickel plating, however one of our clients wanted to clarification as follows:

"Electroless Nickel Plating (ENP) is not used in wet sour service. ENP shall only be used in dry gas and crude oil service. The ENP, which is hardened for anti galling purposes, is easily damaged mechanically and the damaged areas allow for corrosion of the carbon steel substrate. As the steel corrodes it undermines the thin ENP coating resulting in more of it becoming detached from the ball surface."

Can any specialist clarify whether this is indeed accurate. As per my understanding, ENP is a suitable option (SC4 severe environments) as it offers resistance to Hydrogen sulfides, etc. However manufacturers and applicators may have valid insights to this.

Regards,

Rajeev [last name deleted for privacy by Editor]
- Dubai, UAE
^

Ed. note: Can you attribute that quote please, Rajeev?


2006

A. Your client is partly correct. If EN is hardened to more than about 850 HK it will shrink and it will crack, exposing the steel to the environment. Then steel can be attacked (by wet H2S, or acids, or by brine in crude oil) and the EN undermined.

However, if the EN is not hardened, it is very resistant to wet sour streams and is commonly used at temperatures up to about 400 °F.

Ron Duncan
Ron Duncan [dec]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.

^


July 15, 2009

Q. WELL WE ARE GOING TO USE ENP COATED BALL VALVE IN SOUR SERVICE I ALSO NEED TO CONFIRM IT.

NAVED MAHDI
- DAMMAM, Saudi Arabia
^

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