I know HAL is OOB but I do believe they have quite a few systems out in the wild so someone will likely know how to do this or who I should be asking-
My AHJ wants my booth lights and Corken to turn OFF when the booth alarm triggers from a high enough LEL.
Is this something a qualified electrician can make happen with the controllers inside? Like if the alarm horn triggers it sends some signal to my pump and booth lights to turn off?
OR
Is this something within the HAL interface that I can make happen? I have the admin code and password, I just donât want to change the wrong thing and be fucked.
Sounds like youâd have to adjust the logic and wiring to accomplish this, not necessarily the easiest task, but doable with the right knowledge.
Would love that admin code and password, Iâm at a place that would really like to flash the PLC onto a backup unit, but we donât have the login info.
Itâs been 4+ years since Iâve done a HAL install. But there were relays in the control panel you can run accessory equipment like the pump too that will kill its power. I would push back on the lights turning off though. Thatâs sounds like a liability.
any decent electrician should be able to take the triggered relay from the alarm sensor panel and disable any electrical components you need.
I also would not have your lights turn off and would fight that. a properly rated light is designed to be in a room full of vapors, the only reason your power to lights should be shut off is if they are not rated to be in the room, which i doubt the AHJ would allow anyways.
Ok great. I do have my electrician, who is fairly savvy with booth relays to come figure it out for me.
I agree entirely. The booth lights turning off makes no sense to me, theyâre C1D1 rated lights, and he asked me to install an exit light with a power back up INSIDE the booth that doesnât turn off. That has me pretty confused.
Can you install an exit sign on the doorâs window of the booth? save on a c1d1 fixture and also keep electronics out of the booth, that may make the ahj happy since he seems to be weird about rated fixtures in the booth. lol
Agreeing with the opinion the lights shouldnât need to turn off. Anything that generates explosive vapors should be turned off (so I agree that Corken should go down)
Achieving your AHJâs request doesnât seem difficult.
However, it seems like they have zero clueâŚ
The lights are rated. So is the pump.
Sure I donât want the pump continuing to pressurize a leaking vessel, but if Iâve noticed a leak and am using the pump to depressurize said leaking vessel, youâve just sabotaged my ability to get things under control.
Turning the lights out?
Fuck you moron!!
They are not a source of ignition, and at a minimum I need them to make sure everyone is out of the damn booth. You wanna drive everybody out? Use a siren. Donât turn the duckling lights off on me.
I get that presenting it as such to the AHJ will make things worse, not better, but JHC on a raftâŚwhat do they have between their ears?!?
Edit: âhave you tried the big red âwork properlyâ button?â, has been a running joke in my whirled for 35+ yearsâŚthis is this first time Iâve considered that installing such a button might be usefulâŚdo what they want. Install a ânow function correctlyâ switch that returns things to their original settings.
I did research it with the inspector. I guess itâs a new requirement this year for the LPG inspectors that booths have an interlock at 20% LEL that cuts all outlets, lights, and pumps inside the booth and alerts the fire department.
So your booth is supposed to âAlertâ the fire department if the sniffer detects 20% LEL ?
That âAlertâ would be constantly going off every time a rookie operator evacuated his gassy socks or if they burped a tank towards the sniffer.
imagine how insane this would make the people monitoring the âAlertsâ, having false alarms constantly coming in from several labs, the staff would be numb by the time a real alarm went off.
Sometimes it helps just to repeat these scenarios back to them and ask them to explain the logic behind it. In my experiences AHJâs are supposed to interpret the code as it applies to their local bylaws so changing their minds with logic is completely possible. Just hope the inspector doesnât request you hire a code consultant, those can cost time and money years beyond commissioning.
Some AHJs may require you setup a relay to send a âsupervisoryâ alarm to the fire monitoring system when certain conditions exist (xy% LEL). This alarm would not call the fire department, instead your internal representative would get the call.
I visited a lab in Colorado with this requirement. This 100% leads to tampering with equipment so the fire department is not called erroneously. This jurisdiction in CO also charged the business for the call (whether false alarm or actual) which further encouraged tampering to avoid expensive false alarms. Terrible policy.