Sclem615
New User
- Location
- California
- Occupation
- E/I Technician
I work at a treatment plant built in ‘85. It has two anaerobic digesters with membrane covers. The two digesters extend above and below grade.
Between the digesters on ground level is a building that shares a wall with each digester. The building wall and digester wall are one and the same. This building is divided into an MCC room and a sludge mixing room.
Below grade, between the digesters, is a gallery with the same setup. Two walls that are each tank wall, respectively. This gallery contains sludge pumps, grinders, heat exchangers, and instrumentation.
Finally, the sludge level is maintained above grade in each digester. Gas piping is external to the building.
Reading the NFPA 820, it seems that 5 feet from the walls is C1D1 and 5 feet from that boundary is C1D1. Does this apply only to the areas outside the building? Or does it apply to the building and gallery as well?
Between the digesters on ground level is a building that shares a wall with each digester. The building wall and digester wall are one and the same. This building is divided into an MCC room and a sludge mixing room.
Below grade, between the digesters, is a gallery with the same setup. Two walls that are each tank wall, respectively. This gallery contains sludge pumps, grinders, heat exchangers, and instrumentation.
Finally, the sludge level is maintained above grade in each digester. Gas piping is external to the building.
Reading the NFPA 820, it seems that 5 feet from the walls is C1D1 and 5 feet from that boundary is C1D1. Does this apply only to the areas outside the building? Or does it apply to the building and gallery as well?