Replace or Keep Branch Pipe with Remodel?

4/15/2022

I have an existing, single-story building. It's existing Ordinary Hazard Group II that is going to change from acoustical ceiling tile throughout to have no ceiling and be open to structure. The space will essentially be wide open (like a furniture store).

The existing automatic sprinkler system has a 4 inch main that runs the length of the building with branch pipe for the sprinklers.

Would it make more sense to remove and replace the branch pipe for the open structure layout with upright sprinklers, or keep the branch pipe and armover as needed for upright sprinkler spacing?

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7 Comments

Alex

4/15/2022 06:09:54 am

Hi,

Cant really help you out here with this one, too many variables. The design engineer should be able to make the decision after reviewing the building. Some items to look for:

- Has the piping been surveyed or inspected for MIC
- Any leaks in the existing piping (pinholes)?
- Is there 3/4 inch branch lines?
- What are the existing outlet sizes?
- Does the system work, as installed, hydraulically? What about with the new springs you will be adding?
- Does the architect want a nice piping layout or care if the pipes are not coordinated with structure/electrical/mechanical equipment?

In the end, of course reusing the piping will provide a cost savings. But prior to doing so, some engineering/engineering judgment must go into the design.

Alex

Michael

4/15/2022 08:07:08 am

I would think the existing piping would be too low for the new open ceiling concept.

Jesse

4/15/2022 08:10:32 am

Lot of variable here. What was the occupancy hazard class prior? Will there be "storage" of furniture, or just a showroom?

The pendent sprinklers would have been spaced for a floor plan if the space wasn't an open floor plan type before. If the branch-lines work with the new layout, sure? But if it was a lesser occupancy hazard class such as LH, and now you have retail (OH2), you'll need to recalculate the system anyway.

Again, a lot of variables to answer with any certainty.

Glenn Berger

4/15/2022 08:30:02 am

Ask three different sprinkler contractors and you will get three answers.

Since the comment does not indicate when the existing installation was performed, I would recommend removing one section of piping and examine the interior condition to see if piping is satisfactory for continual use.

Hunter

4/15/2022 10:18:43 am

How many heads we talking plus or minus what?

Spin the pipe and re sprig for uprights. Hydro test.

Design engineer to determine re calc...

Scott McBride

4/15/2022 11:57:11 am

It will depend on the ceiling/roof to deflector distance of the exiting sprinklers. If the drop ceiling is a greater distance that what is rated then they will have to take a look at the design of the system. Either way I would have a Sprinkler Company or Fire Protection Consultant take a look at it.

Pete H

4/15/2022 12:38:46 pm

Depends how long your sprigs for the uprights will be, how close the branches are to the new upright locations, is your hazard going to change? And of course.... after they remove all the ceilings, is there a plan to make this a storage facility? In which case, this may have to be redesigned for storage.

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Replace or Keep Branch Pipe with Remodel?

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