Is it necessary for the Fire sprinkler black steel pipes to be UL listed although it is conforming with ASTM A53 standard as per NFPA 13 220.127.116.11.? If the answer is yes, in which code can I find such information?
There is no requirement for materials or components to be "UL Listed", simply listed by an organization that is acceptable to the AHJ. Commonly this could be UL but there are other agencies which provide testing, certification, and listing.
There is no requirement for sprinkler pipe to be listed provided it complies with the relevant standards (refer NFPA 13 2019 edition section 18.104.22.168)
It seems to be a common misconception by engineers from the US that it's necessary for sprinkler pipe to be listed. Presumably listed pipe is used almost exclusively in the US as it is cheaper than non-listed alternatives. Outside North America, listed pipe is hard to come by and is not necessary.
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