Does anyone have successful experience with routing a fire sprinkler drain and/or inspector's test to a mop sink?
I have a client that has a 12" deep mop sink in a janitor's closet which the contractor is asking to as the discharge for an inspector's test. I suspect that with the pressures on the system (~120 psi) and a typical 1/2" orifice, that the flow will be roughly 60 gpm (=5.6 x sqrt (120)). We are recommending a 4" plumbing standpipe to accept the inspector's test if a drain riser can't be routed to the exterior separately. What are your thoughts? Posted anonymously by a member for discussion. Discuss this | Submit a Question | Subscribe
8 Comments
Raul Vasquez
4/3/2019 10:10:33 am
Nope. Water everywhere.
Reply
Rusty Scott
4/3/2019 10:22:09 am
When I was a sprinkler contractor we took auxiliary drains to the janitors sink just to help drain the system faster for maintenance. But never a test and drain for testing.
Reply
Vince
4/3/2019 10:30:23 am
Depending what state your located in here, in Nevada we are not allowed to dump into a drain at all. The AHJ's and Water District does not allow this for the chemicals that are used.
Reply
PETE
4/3/2019 10:32:07 am
That's only allowed in Mississippi.
Reply
4/3/2019 12:03:31 pm
As the previous comments are stating, this is not a good idea unless you want black mud all over the walls adjacent to the mop sink.
Reply
Mike
4/3/2019 01:36:56 pm
There are tables in the plumbing manuals indicating capacities of drain pipes under various conditions. I'd simply give them the flow and have the mechanical engineer design it to release liability from you.
Reply
Doug Funk
4/3/2019 08:09:29 pm
As an inspector, I would not recommend an inspectors test into a mop sink. It rarely turns out well.
Reply
Leave a Reply. |
Free SignupSubscribe and learn something new each day:
CommunityThank You to Our Top
October '20 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
January 2021
Daily
Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
Exam Prep2020 PE Prep Guide
(Available Now!) PE Prep Series
(Available Now!) 2020 PE Prep Series
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. |