A FORUM FOR FIRE PROTECTION QUESTIONS & PE EXAM PROBLEMS | SUBSCRIBE NOW
|
I've seen floor control assemblies (isolation valve, sometimes a check valve, waterflow switch, test & drain) in many different configurations as far as spacing of each of the components. I also understand that several manufacturers make an "all in one" valve assembly that can have all of these components.
Is there any benefit to the operation of the waterflow switch by spacing out these components? I'm wondering if a steady stream from the test and drain that is further from the switch allows the waterflow switch to operate more consistently? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
2 Comments
PJD
6/18/2019 10:48:22 am
Sir or Ma'am,
Anonymous
6/18/2019 11:20:33 am
The conservative distances in the flow switch literature have been there ever since I remember. The manufactured risers (like the Reliable CR of Vic 747M) are listed with tighter distances. I still have contractor who insists on fabricating the devices 3 or 4 inches apart, which I consider an unnecessary liability. However at least for Potter, you Potter rep can provide a latter where the claim the distances are just recommendations. They state, "If the device passes the flow test it can be considered an acceptable installation." When I started in the industry we would just maintain 12" distance. If fabricating myself, I still try to provided the distance recommended in the literature to ensure operation and reduce the liability risk. The "all in one" devices seem to pencil-out these days however. Leave a Reply. |
Free SignupSubscribe and learn something new each day:
CommunityThank You to Our Top September Contributors!
Your PostThe ToolkitSprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more: 
Filters
All
Archives
November 2019
Daily
Daily discussion questions are open-ended questions posed by members for the benefit of sharing expertise and learning from other perspectives. Join as a member here.
Exam Prep
2019 PE Prep Guide
(Available Now!) 
PE Prep Series
(Available Now!) Current Leaderboard
(Click to enlarge) 
PE Problems
Visit July-October for daily Fire Protection PE Exam sample questions.
Solutions are posted the day after posting. Comment with your solutions, questions or clarifications. Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves. |
RSS Feed
