Sprinkler lines and radiant tube heaters

[Shredocaster]

How close can a radiant tube heater be installed (above) a sprinkler line/main before it becomes troublesome to the sprinkler pipe and closest sprinklers and fittings (couplings and gaskets).

 

[cdafd]

There are some other guidelines in NFPA 13 also


8.3.2.5* The following practices shall be observed to provide sprinklers of other than ordinary-temperature classification unless other temperatures are determined or unless high-temperature sprinklers are used throughout, and temperature selection shall be in accordance with Table 8.3.2.5(a), Table 8.3.2.5(b), Table 8.3.2.5(c), and Figure 8.3.2.5:


(1)*
Sprinklers in the high-temperature zone shall be of the high-temperature classification, and sprinklers in the intermediate-temperature zone shall be of the intermediate-temperature classification.


(2)
Sprinklers located within 12 in. (300 mm) to one side or 30 in. (750 mm) above an uncovered steam main, heating coil, or radiator shall be of the intermediate-temperature classification.


(3)
Sprinklers within 7 ft (2.1 m) of a low-pressure blowoff valve that discharges free in a large room shall be of the high-temperature classification.


(4)
Sprinklers under glass or plastic skylights exposed to the direct rays of the sun shall be of the intermediate-temperature classification.


(5)
Sprinklers in an unventilated, concealed space, under an uninsulated roof, or in an unventilated attic shall be of the intermediate-temperature classification.


(6)
Sprinklers in unventilated show windows having high-powered electric lights near the ceiling shall be of the intermediate-temperature classification.


(7)
Sprinklers protecting commercial-type cooking equipment and ventilation systems shall be of the high- or extra high–temperature classification as determined by use of a temperature-measuring device. (See 7.9.6.)


(8)
Sprinklers protecting residential areas installed near specific heat sources identified in Table 8.3.2.5(c) shall be installed in accordance with Table 8.3.2.5(c).


(9)
Ordinary-temperature sprinklers located adjacent to a heating duct that discharges air that is less than 100°F (38°C) are not required to be separated in accordance with Table 8.3.2.5(a).


(10)
Sprinklers in walk-in type coolers and freezers with automatic defrosting shall be of the intermediate-temperature classification or higher.



Cannot paste table 8.3.2.5 NFPA 13 2010 edtion if you have access or NFPA allows free access, just a little hard to get through