I would like to open up a topic to this amazing forum.
Preaction systems...types, cost, challenges, panel set-ups...I continue to see the vast lack of knowledge amongst the design and management community. Which type is best? Which is more economical? Which is best for your company to install or to maintain? How does a double interlock system affect design/cost? Can a single interlock system be set up to operate the way you need and at a lower cost? Does the AHJ typically have any special requests? Knowing these answers could only make everyone's lives easier. Thanks in advance! Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
6 Comments
Mike L
12/30/2019 02:40:37 pm
Yes, there seems to be a mystery about Pre-Action systems. Even within our office, electrical engineers who design the activation system don't fully understand the proper sequence of operation.
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MIGUEL ANGEL D ADARIO
12/30/2019 03:49:49 pm
To the comments made by MIKEL, I would add when we have a double action system in frozen areas, great care must be taken with the shapes and slopes of the pipe, so that after acting the system can be completely emptied.
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Kelly
12/31/2019 10:39:46 am
This post does a good job of summarizing the differences:
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James
12/31/2019 10:42:40 am
Very well said Kelly!
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Michael Millman
1/15/2020 02:17:01 pm
I typically push for spot heat detectors or even linear heat detection to be used for pre-action activation for exactly the issue you mention (false alarms due to dust etc, vape, etc.). VESDA/ASD is an option as well especially for data centers that tends to avoid false alarms but provides a very accurate level of detection.
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Michael Millman
1/15/2020 02:03:48 pm
I try to push my clients to use Single Interlock for numerous reasons.
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