If it is listed for FP use and appropriate for the pressure classification needed for your system, then yes. See below for additional relevant NFPA 13 (2022) requirements and considerations:
7.3 Aboveground Pipe and Tube. 7.3.1 General. 7 .3.1.1 Pipe or tube shall meet or exceed one of the standards in Table 7.3.1.1 or be in accordance with 7.3.3. 7.3.3* Listed Metallic Pipe and Tubing. 7.3.3.1 Other types of pipe or tube investigated for suitability in automatic sprinkler installations and listed for this service, including steel, and differing from that provided in Table 7.3.1.1 shall be permitted where installed in accordance with their listing limitations, including installation instructions. A.7.3.3 Other types of pipe and tube that have been investigated and listed for sprinkler applications include lightweight steel pipe. While these products can offer advantages, such as ease of handling and installation, cost effectiveness, and reduction of friction losses, it is important to recognize that they also have limitations that are to be considered by those contemplating their use or acceptance. Corrosion studies have shown that, in comparison to Schedule 40 pipe, the effective life of lightweight steel pipe can be reduced, the level of reduction being related to its wall thickness. Further information with respect to corrosion resistance is contained in the individual listings for such pipe. The references in Table 7.3.1.1 will provide information on whether the pipe wall thickness you want to use, is listed per that reference. 16.3.2* Steel Pipe - Welded or Roll-Grooved. When steel pipe referenced in Table 7.3.1.1 is used and joined by welding as referenced in 7.5.2 or by roll-grooved pipe and fittings as referenced in 7.5.3, the minimum nominal wall thickness for pressures up to 300 psi (21 bar) shall be in accordance with Schedule 10 for pipe sizes up to 5 in. (125 mm), 0.134 in. (3.4 mm) for 6 in. (150 mm) pipe, 0.188 in. (4.8 mm) for 8 in. and 10 in. (200 mm and 250 mm) pipe, and 0.330 in. (8.4 mm) for 12 in. (300 mm) pipe. See Table A.16.3.2 for steel pipe dimensions including pipe wall thicknesses down to Schedule 5. Allowable piping this thin has connection-type restrictions: 16.3.3 Steel Pipe - Threaded. When steel pipe referenced in Table 7.3.1.1 is joined by threaded fittings referenced in 7.5.1 or by fittings used with pipe having cut grooves, the minimum wall thickness shall be in accordance with Schedule 30 pipe [in sizes 8 in. (200 mm) and larger] or Schedule 40 pipe [in sizes less than 8 in. (200 mm)] for pressures up to 300 psi (21 bar). 16.3.4 Specially Listed Steel Pipe. Pressure limitations and wall thickness for steel pipe specially listed in accordance with 7.3.3 shall be permitted to be in accordance with the pipe listing requirements. Piping less than Sch. 10 does not have the same bending requirements for fire protection per NFPA 13 Section 16.3.8 below: 16.3.8 Metallic Pipe and Tube Bending. 16.3.8.1 Bending of Schedule 10 steel pipe, or any steel pipe of wall thickness equal to or greater than Schedule 10 and Types Kand L copper tube, shall be permitted when bends are made with no kinks, ripples, distortions, or reductions in diameter or any noticeable deviations from round. 16.3.8.2 For Schedule 40 and copper tubing, the minimum radius of a bend shall be six pipe diameters for pipe sizes 2 in. (50 mm) and smaller and five pipe diameters for pipe sizes 2½ in. (65 mm) and larger. 16.3.8.3 For all other steel pipe, the minimum radius of a bend shall be 12 pipe diameters for all sizes. 16.3.8.4 Bending of listed pipe and tubing shall be permitted as allowed by the listing. Hope this helps, Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Associate Fire Protection Engineer \ Upper Midwest Region O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923 [email protected]<mailto:[email protected]> \ burnsmcd.com<http://www.burnsmcd.com/> 8201 Norman Center Drive, Suite 500 \ Bloomington, MN 55437 *Registered in: AK, LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout From: Luis Perea <[email protected]> Sent: Monday, January 8, 2024 10:28 AM To: [email protected] Subject: [Sprinklerforum] LIGHT-WALL SCH 7 NFPA Hi Everyone, According to NFPA is it permitted to use light-wall sch 7 for branclines? Or sch 10 is a must? Thanks, [cid:[email protected]]
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