|
During a recent life safety walk through of a popular boat show, I observed the installation of a temporary Class I wet standpipe system to supply various hose valves along the docks.
I noticed the 4-inch Silver-Line Schedule 40 PVC pipe was being supported randomly. I recorded distances ranging from 9 to 15 feet. I consulted with NFPA 14 then 13. NFPA 13, Table 17.4.2.1 shows "NA" for 4 inch CPVC pipe. In viewing the cut sheets for the listed pipe, the support spacing is 7.7 feet at 73 degrees F. My question is, is my methodology correct on how I went about getting the correct spacing in order to advise the the contractor? Please advise. Thank you. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments
James Phifer
3/17/2022 08:15:51 am
CPVC pipe doesn't come in 4" or larger sizes and NFPA 13 doesn't give any guidelines for hanging PVC pipe. therefore, i think you'd have to go wit the recommendations of the manufacturer and not exceed 7.7 feet between hangers.
D W
3/17/2022 08:32:40 am
I'm not 100% sure, and I'm asking more than I'm stating. But wouldn't you need to consult NFPA 307 for this? and if so they state in 4.3.3.1.3.4 (Bracing) that "horizontal and vertical bracing shall be provided at not more than 20ft intervals on all sprinkler piping 3inch or larger that is parallel to and within 50ft of the face of the pier or wharf and where the bracing has the possibility of being subjected to heavy fireboat nozzle streams." I'm not sure if this is the correct approach, it's just what came to mind when I saw this question.
Glenn Berger
3/17/2022 08:47:47 am
Good call in the mentioning and knowledge of NFPA 307.
David Kendrick
3/17/2022 09:01:35 am
Plastic pipe institute states CPVC is available up to 24 in diameter pipe.
Alex
3/17/2022 10:15:51 am
From the question, it sounds like you are simply observing a possible issue and want to learn more/raise a flag? If so, I recommend reaching out to the engineer of record. I'm sure they would be happy to walk you through their design process... I know I would be!
Jay
3/17/2022 10:30:26 am
Doesn't really pertain to your question, but something to be aware of from NFPA14:13.4.1.2 Leave a Reply. |
ALL-ACCESS
SUBSCRIBESubscribe and learn something new each day:
COMMUNITYTop November '24 Contributors
YOUR POSTPE EXAMGet 100 Days of Free Sample Questions right to you!
FILTERS
All
ARCHIVES
December 2024
PE PREP SERIES |
RSS Feed
