If I recall, I believe Sch 7 pipe became popular for use in Press-Fit systems. And I think that was galvanized, nit black. Outside of that I haven’t seen a situation where it gives you any significant advantage over sch 10. However, if it is listed for fire service, it is would be acceptable.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell) > > On Jan 8, 2024 at 12:14 PM, <Ryan Hinson (mailto:[email protected])> > wrote: > > > > > > 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, > > > > > > > > > > > > > > > > > > > > > > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
_________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]
