Controlled primarily through hardness limits. The standard typically mandates a maximum weldment hardness of 200 HBW (Brinell) to prevent cracking in wet H2Scap H sub 2 cap S environments.
: The primary source for the reaffirmed 2020 version. nace rp0472 pdf new
(formerly RP0472 ), titled "Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments," is a critical standard used to ensure the integrity of refinery equipment. Controlled primarily through hardness limits
The latest version of the standard NACE SP0472-2020 focuses on two primary cracking mechanisms: nace rp0472 pdf new