DNV-OS-A101 Safety Principles and Arrangements

The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.

A: Categorisation

App.A A
401 Typical secondary sources of release:

—	standard flanges, connections and valves
—	pumps and compressors (depending on design)
—	areas outside of Zone 0 or 1 if release point has varying rates and frequency of release
—	ventilation openings from a Zone 2 area
—	bell nipple (drilling nipple)
—	wireline stuffing box
—	set-back drill pipe if coated with drilling mud
—	gas vents from kill and choke manifold
—	diverter vents from drilling BOP.

Guidance note:
Welded piping systems without flanges or other leak sources are not regarded as sources of release.

---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---