NACE vs ISO Requirement
NACE vs ISO Requirement
(OP)
Hi,
A client requested ISO 12944 C5M rated paint to be used at 265oF. Is it possible to directly compare and select a marine paint based off NACE standards (Up to 300oF) since the salt spray test hour values do not represent actual conditions. User application is for a mineral-ore plant near the ocean in the tropics.
Thank you.
A client requested ISO 12944 C5M rated paint to be used at 265oF. Is it possible to directly compare and select a marine paint based off NACE standards (Up to 300oF) since the salt spray test hour values do not represent actual conditions. User application is for a mineral-ore plant near the ocean in the tropics.
Thank you.
RE: NACE vs ISO Requirement
If you want peace of mind, and ease of selection, thermal spray aluminium would be the way to go for the quoted conditions. Long life, low maintenance.
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: NACE vs ISO Requirement
Is it reasonable to assume the elevated temperature in this case comes from the process rather than the atmosphere? If so, and the temperature is continual, the concern might be more on the impact on the resin base of the paint than corrosion risk?
Cheers
GG
RE: NACE vs ISO Requirement
GGedge, I think the client provided old spec sheets, it is C5. Yes the elevated temperature is from the product which is at around 70oC. The 130oC is a buffer against an upset condition.
By the looks of it, the paint requirements are unrealistic, i.e. ISO12944 and 130oC
Thank you.
RE: NACE vs ISO Requirement
RE: NACE vs ISO Requirement
In relation to TSA, you might refer to ISO 12944 Part 9, Table 3 Note a), which is for a CX offshore service. There are also various references in that part of the standard to "high durability" which is ISO speak for a life to first maintenance of 15 to 25 years and it is supposed to cover coating up to 80 Celsius. Some might consider this a bit of a contrived argument but if you need to use the ISO then it is probably the best you can do.
NORSOK M501 System 2A is sealed thermally sprayed aluminium for use in offshore application at elevated temperature but unfortunately that standard doesn't include a durability rating. Given the scope of application it is reasonable to assume it is similar to ISO 12944-9. I think part of the intent of Part 9 was that it would replace or be accepted as an alternative to NORSOK M501.
Cheers
GG
RE: NACE vs ISO Requirement