Pipe Schedule System - Amount of Sprinklers
Pipe Schedule System - Amount of Sprinklers
(OP)
Hello,
I am currently making a modification to an existing wet pipe sprinkler system that utilizes the pipe schedule layout. I am very experienced in the design and layout of fire sprinklers, and have been employed in the industry for over 10 years. I am, however, currently blanking on the subject. The light hazard system chart in NFPA 13 23.5.2.2.1 specifies the number of sprinklers allowed per pipe schedule standards; in this chart, 1½" pipe is shown to allow 5 sprinklers. The system I am currently working with is supplied with a 4" wet standpipe and each floor utilizes a 2½" crossmain to supply the branchlines.
My question; in a branchline run, starting with an 1½" pipe size,can that entire branchline only allow 5 sprinklers total, with the reduction of pipe down the line, or are 5 sprinklers allowed on the 1½" section and as the pipe size reduces, those sections can supply the number of sprinklers specified in the table? The reason I ask to clarify, is the existing system has many instances where the 1½" pipe starts the line and there is 6 or more sprinklers on the line; and the two final sprinklers are supplied by 1" piping.
Thank you in advance.
I am currently making a modification to an existing wet pipe sprinkler system that utilizes the pipe schedule layout. I am very experienced in the design and layout of fire sprinklers, and have been employed in the industry for over 10 years. I am, however, currently blanking on the subject. The light hazard system chart in NFPA 13 23.5.2.2.1 specifies the number of sprinklers allowed per pipe schedule standards; in this chart, 1½" pipe is shown to allow 5 sprinklers. The system I am currently working with is supplied with a 4" wet standpipe and each floor utilizes a 2½" crossmain to supply the branchlines.
My question; in a branchline run, starting with an 1½" pipe size,can that entire branchline only allow 5 sprinklers total, with the reduction of pipe down the line, or are 5 sprinklers allowed on the 1½" section and as the pipe size reduces, those sections can supply the number of sprinklers specified in the table? The reason I ask to clarify, is the existing system has many instances where the 1½" pipe starts the line and there is 6 or more sprinklers on the line; and the two final sprinklers are supplied by 1" piping.
Thank you in advance.





RE: Pipe Schedule System - Amount of Sprinklers
Many people fail to realize that you can't just add a sprinkler to a pipe schedule system without check everything upstream and downstream.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...
RE: Pipe Schedule System - Amount of Sprinklers
That was my thought as well, I just wanted to verify with some others as well. I appreciate the response.
Thank You!
RE: Pipe Schedule System - Amount of Sprinklers
RE: Pipe Schedule System - Amount of Sprinklers
Rated walls only come in to play when you use the room design method for calculations. But with a pipe schedule system, you don't get that.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...
RE: Pipe Schedule System - Amount of Sprinklers
How much would you spend to calculate the system using today's technology?
Depending on system size, it could save you $$$ overall. Not to mention the added benefit of providing the owner the calcs which would be of benefit later..
R/
Matt
RE: Pipe Schedule System - Amount of Sprinklers