Fire Protection Rectangle Lube Oil Reservior 1

[Chance17]

I am evaluating a 6'L by 4'W by 4'H Lube oil reservior on a centrifugal compressor. The existing unit has a 3" open vent to atmosphere. The estimated pressure rating is 4"-wc. The fluid boiling point is about 650-F. Using API-2000 equations for Fire, an 8" open vent is needed. The client says API-2000 only applies to cylinder tanks. Instead, the reservior is govenered by API-617 and the only requirement is a 2" open vent (external fire not a concern. By memory, I have seen about a dozen of these rectangular reserviors and none have very large vents. Is there any technical reason to exclude these equipment from Fire overpressure

 

[stookeyfpe]

The client is clueless. Under NFPA 30, a tank is vessel over 60 gallons and emergency venting is required. The only time it can be excluded is for Class IIIB liquids in tanks over 12,000 gallons volume within their own containment or outside the drainage path of Class I and II liquids.

An emergency vent is required and needs to be sized in accordance with API 2000.