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.
Author
Nkumar
Nozzle Loads on Pumps and Compressors: Keeping Rotating Equipment Happy
Rotating equipment is sensitive to the forces piping puts on it. Allowable nozzle loads are small, and meeting them shapes the whole layout around a pump or compressor.
Post-Weld Heat Treatment (PWHT): When and Why
PWHT relaxes residual stress and tempers hard weld zones. Sometimes the code requires it because of thickness; sometimes the service does.
Open and Closed Drains: Onshore Sewers vs Offshore Drain Systems
Drains look simple, but mixing the wrong fluids or creating a gas path through a drain can cause serious incidents. Here is how onshore and offshore facilities separate them.
Gaskets: Spiral Wound, Ring Joint and Sheet — Which Goes Where
The gasket is the weakest part of a flanged joint and a common source of leaks. Choosing the right type for the flange, pressure and fluid is the first step to a tight joint.