vandv
Member
- Location
- Friendswood, Texas
I apologize ahead of time because I know the answer to these questions. I have an ongoing debate with a few entry level "Engineers / Project managers". No degree here just in the business 20+ years.
I believe many of you will find it interesting though.
Information sources to be used include but not limited to;
NFPA 496 "Purged and pressurized enclosures"
NEC Article (500-517)
API 752 & 753 (5)
And a little common sense
My motto is, "When in doubt, error on the side of safety".
Factors:
1. A temporary BRB (Blast resistant building) used as an office.
2. A C1D2 (condenser section only) C & D modified BARD wall mount unit.
3. Interior components non-classified
4. All exterior components with the exception of the a/c C1D1 (Seals, Exp. disconnect etc.)
5. No gas detection.
6. No pressurization.
7. No pressure seal dampers in buildings penetrations (Supply and return HVAC frame)
8. Fresh air box on the side of the a/c unit with 5' stack.
9. Fresh air box has 12"x12" motorized low leakage pressure seal damper with motor on the interior side of the boundary.
10. There no MARKINGS on the building regarding procedures for Evacuation / or Shelter in place procedures.
THE DEBATE:
1. The BRB office is suitable for operating in a C1D2 C & D location.
2. There is no need for low leakage pressure sealed dampers in the supply and return of the a/c frame because there is a damper in the fresh air box on the side of the a/c unit that can be closed.
4. The a/c unit can continue to operate in "recirculation mode" by closing the damper in the fresh air box in a C1D2 C & D area during an abnormal release of flammable gas.
5. They even want to argue the true meaning of "Shelter in place".
Engineers, too smart for their own good. (Humor)
Any input here is appreciated. If I can learn something I embrace it.
Thanks,
V
I believe many of you will find it interesting though.
Information sources to be used include but not limited to;
NFPA 496 "Purged and pressurized enclosures"
NEC Article (500-517)
API 752 & 753 (5)
And a little common sense
My motto is, "When in doubt, error on the side of safety".
Factors:
1. A temporary BRB (Blast resistant building) used as an office.
2. A C1D2 (condenser section only) C & D modified BARD wall mount unit.
3. Interior components non-classified
4. All exterior components with the exception of the a/c C1D1 (Seals, Exp. disconnect etc.)
5. No gas detection.
6. No pressurization.
7. No pressure seal dampers in buildings penetrations (Supply and return HVAC frame)
8. Fresh air box on the side of the a/c unit with 5' stack.
9. Fresh air box has 12"x12" motorized low leakage pressure seal damper with motor on the interior side of the boundary.
10. There no MARKINGS on the building regarding procedures for Evacuation / or Shelter in place procedures.
THE DEBATE:
1. The BRB office is suitable for operating in a C1D2 C & D location.
2. There is no need for low leakage pressure sealed dampers in the supply and return of the a/c frame because there is a damper in the fresh air box on the side of the a/c unit that can be closed.
4. The a/c unit can continue to operate in "recirculation mode" by closing the damper in the fresh air box in a C1D2 C & D area during an abnormal release of flammable gas.
5. They even want to argue the true meaning of "Shelter in place".
Engineers, too smart for their own good. (Humor)
Any input here is appreciated. If I can learn something I embrace it.
Thanks,
V