I have a question id like a second opinion about. I have a client with a new build boat storage facility, approx 30 ft high, at one end on the ground floor is an office area with a suspended ceiling. The installers have used U-Bolt Mechanical Tee couplings to attach the drops to the branch line, and then hung 20-ft of 1" pipe as the drop.
What is the correct way to secure these drops?
There is currently no lateral or vertical support. This is not in a seismic area.
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6/1/2020 08:23:42 am
As you reference there is no seismic qualifications...there is nothing in NFPA to require additional hanging if the arm overs comply with the requirements of "Unsupported Lengths" in whatever year is your applicable standard.
6/3/2020 01:24:48 pm
Thanks for taking the time to respond, much appreciated
6/1/2020 10:56:44 am
Dan nailed it. Exactly what I was going to say. Have to watch the weight of the drop "spinning" the line, especially if its grooved above. Also, just the amount of stress being put on that armover is concerning. Definitely a hanger at the armover if it happens up top, nothing if it happens close to the office ceiling.
6/3/2020 01:25:09 pm
6/1/2020 11:39:52 am
I would suggest installing a mechanical tee close to the wall, drop down then arm over to the sprinkler head location for the office. Then you have the option to strap to the wall for support and hang the armover from the deck or steel above. I would especially use this method if there were many drops being supplied from above.
6/3/2020 01:25:49 pm
Thanks for the feedback - good options
6/1/2020 01:15:22 pm
No requirements for restraint but that's a lot of pipe for a mechanical tee. Might end up needing a Tee, nipple and cap to the closest joist for hanging.
6/3/2020 01:26:23 pm
Just doesnt look right ! Gives me cause for concern
6/5/2020 09:34:41 am
In the past, where we had large areas, we would install a new main at the lower ceiling level, tapping off of the main above, and use branch lines or arm-overs from that new main. While your work is already installed, this method may work for you in a future project.
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