Is this a new requirement? is it enforced, if so which agency?
If the coupons are hanging from the pipe, it is an indication that the coupon is not in the pipe. A coupon, not removed could be pushed downstream by water flow. This could block the water flow.
Or it could mean the pipefitter made sure he has some extra coupons in his tool box.
I understand the intent of the idea and practice, but can anyone actually provide the section # of the requirement in NFPA 13? The closest I can find is NFPA 13 - 220.127.116.11 (2) that states "Have all disks retrieved". I have read and searched several different editions of 13 and can not find a requirement anywhere to attach the cut disks or "coupons" to the pipe.
I don't believe it's required, only common practice and most AHJ's appreciate it.
I believe that the above ground materials and test certificate has a section regarding having a system in place to make sure no coupons are left in the pipe.
Retrieving data ...