NORSOK and DNV: The Standards Behind North Sea and Offshore Piping
Offshore projects add a layer of NORSOK and DNV standards on top of ASME. Here are the ones a piping engineer meets most often and what each one controls.
Environment
Offshore
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.