Sour Service Basics: Reading NACE MR0175 / ISO 15156
When hydrogen sulfide is present, ordinary steel can crack without warning. Here is when a line becomes "sour" and what that changes in materials, hardness and welding.
Topic
Materials & Corrosion
Carbon steel, duplex, CuNi and sour service.
Seawater Piping: Copper-Nickel, Super Duplex or GRE?
Seawater systems are among the most corrosion-prone on any facility. Three materials dominate the choice, each with its own limits on velocity, temperature and fire.
Carbon Steel Pipe Grades: A106 B, API 5L and A333 for Low Temperature
Most process piping is carbon steel, but not all carbon steel pipe is the same. Here is how the common grades differ and how to match pipe, fittings and flanges.
Duplex and Super Duplex Stainless Steels in Offshore Piping
Duplex steels give strength and corrosion resistance at a sensible weight, which is why offshore topsides use so much of them. Getting the welding right is the hard part.
Corrosion Allowance: How It Is Chosen and What It Doesn’t Protect Against
Corrosion allowance is the extra wall added for metal loss over the plant's life. It works well for uniform corrosion and very poorly for almost everything else.