Fail-Safe ventilation
Fail-Safe ventilation
(OP)
The code requires standby power for ventilation for hazardous material storage space. Exception if there is a "fail-safe engineered system". Any idea what that could consist of?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
I would add a flow switch or differential-pressure switch (or three or four for redundancy) to the powered exhaust as well, so not just power outage opens the dampers. Failed exhauster (I assume you would not want positive pressure in this room) could spring 'em open as well.
To satisfy AHJ, though, it might need to be submitted as a system to somebody like FM.
Carlos, be sure and let us know how this all plays out!!
Good on ya,
Goober Dave
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
RE: Fail-Safe ventilation
imok, you stated to tie the system into the standby power system, carl is looking for a possible solution to avoid this if he can.
holland, if he's going to install the fan on the standby power system, he won't need a fan to meet minimum standards, as the primary fan will already be sized for it.
carl, you should take these ideas and study the code as much as possible, and TALK to the local (or state) code inspector. Most of the guys (only ever were guys on my end) are more than willing to talk to you about a solution. They may not always agree, but at least you can get an answer for your question before spending too much time designing a system that will not pass code (according to the inspector) anyway.
RE: Fail-Safe ventilation
I hope this has clarified it.
RE: Fail-Safe ventilation
To use natural ventilation I need a temperature difference (I would not count on gases being heavier or lighter than air). If the temperature is the same outside as inside no reasonable amount of dampers in any position will give me any air flow. I was looking for a way to avoid the generator. If we still had the old NY State code I could connect the power ahead of the main disconnect perhaps. I was thinking along those lines. We will just use a generator. (the case I am working on is a large industrial area so the air flow is high and the generator will be significant)
RE: Fail-Safe ventilation
Actually, I can envision one but it's a lot like a house in a childrens' cartoon -- shaped like an A-frame, and on power failure the walls all spring away from the apex and fall flat on the ground. Suddenly it's an outdoor location for which ventilation is not required...
Good on ya,
Goober Dave
RE: Fail-Safe ventilation