SprinkFLEX® Stainless Steel Sprinkler Fittings connect the branch line to the sprinkler using a flexible stainless steel hose and reducer.
The flexible stainless steel hose and fittings are intended for direct connection to the sprinkler and are particularly suited for use in suspended ceiling applications. Each drop assembly comes with one stainless steel flexible hose, one branch line connection nipple, one sprinkler reducing nipple and Bracket system. Flexible stainless steel hoses are available in lengths from 28-71 inches (700/1800 mm) with either ½ -inch or ¾ inch NPT threaded outlets.
The flexible stainless steel hose should not be bent or fluctuated up-and-down or side-to-side when it is pressurized for test. The flexible stainless steel hose should not be bent within 2 ½ inches / 64 mm of the connection nut at both ends. Failure to follow these instructions could cause improper sprinkler operation, resulting in serious personal injury and/or property damage.
Installation for Wood or Metal Studs
- Separate nipple (if necessary) from the flexible hose and attach the nipple onto the branch line. Make sure that the arrow is in the appropriate direction of flow to the sprinkler and to use pipe thread sealant or Teflon tape at the connection to the branch line. (See Figure 1)
Attach one end of the flexible hose to the nipple and the other end of the flexible hose to the sprinkler reducer fitting (if necessary) tighten the slip nuts on both ends of flexible hose to maximum torque of 25 ft-lb. Do not twist the flexible hose. Note: Do not use pipe thread sealant or Teflon tape on threads connecting a flexible hose to fittings, as the gasket on the end of the flexible hose provides the leak-proof connection. (See Figure 2A & 2B)
- Remove the screw from only one end bracket assembly of the One-Piece Bracket. Remove the end bracket assembly from the square bar.
- Remove the wing nut from each of the end bracket assemblies.
- Measure the distance between the wood or metal studs. Cut the square bar to the length needed to fit between the two wood or metal studs. This length must be measured from the outside of the end bracket assembly (with the wing nut removed) to the point on the square bar that will butt up against the other wood or metal stud.
- Place the end bracket assembly, removed in step 2, onto the end of the square bar so that the square bar is flush with the outside of the end brackets assembly.
- Re-install the end bracket assembly to the square bar with the screw removed in step 2.
- For Wood Studs: Install the modified One-Piece Bracket assembly between the wood studs by using four, 1 ½ inch/ 38-mm long # 10 wood screws in the end brackets (See Figure 3).
For Metal Studs: Install the modified One-Piece Bracket assembly between the metal studs by using four, 1 ¼ inch/ 32-mm long # 10 self-drilling screws in the end bracket (See Figure 4).
- Bend the flexible hose into a curve that locates the sprinkler reducer at the other end of the flexible hose in the area where the sprinkler will be located. The tube arc should not be twisted, and arc should be as large and smooth as possible. The minimum bending radius is 8 inch (203 mm). Flexible hoses are not to be installed straight (no bends).
- Insert the sprinkler reducer into the bracket. Locate the reducer bracket and sprinkler reducer where the sprinkler will be, and loosely tighten the butterfly bolts on the bracket.
- Attach the sprinkler to the sprinkler reducer using pipe thread sealant or Teflon tape. Put a wrench on the sprinkler reducer to counteract the tightening torque and prevent the flexible hose from twisting. Reference the sprinkler manufacturer’s data sheet for appropriate sprinkler tightening torque, sprinkler wrench, and other guidance.
- Verify that the sprinkler reducer is seated in the reducer bracket; precisely locate the sprinkler in all three axis in accordance with the sprinkler manufacturer’s data sheet. Tighten all butterfly hex bolts on reducer bracket. (See Fig. 5)
- After tightening all the bolts, verify that the sprinkler is properly located in accordance with the manufacturer’s instruction. If not, loosen the butterfly bolts and re-adjust as required.
- Installation of the SprinkFLEX® flexible sprinkler hose fitting is complete.
- After installation is complete, test the system for leaks in accordance with NFPA guidelines
Friction Loss Data
|MODEL||INLET & OUTLET SIZE, NPT INCH||LENGTH INCH (mm)||NUMBER OF 90 DEGREE BENDS||MAXIMUM EQUIVALENT LENGTH OF SCH 40 1 INCH DIAMETER PIPE (C=120), FT|
|*SFB are braided models|
|SFB28*||1 x ½||28" (700mm)||2||18.6|
|SFB28*||1 x ¾||28" (700mm)||2||18.8|
|SFB40*||1 x ½||40" (1000mm)||3||24.6|
|SFB40*||1 x ¾||40" (1000mm)||3||24.8|
|SFB48*||1 x ½||48" (1200mm)||3||28.5|
|SFB48*||1 x ¾||48" (1200mm)||3||28.7|
|SFB59*||1 x ½||59" (1500mm)||3||34.4|
|SFB59*||1 x ¾||59" (1500mm)||3||34.6|
|SFB71*||1 x ½||71" (1800mm)||3||40.4|
|SFB71*||1 x ¾||71" (1800mm)||3||40.6|
Maximum Working Pressure: 200 psi (1375 kPa)
Maximum Ambient Temperature: 300˚ F (149˚C)
Connection to Branch Line: 1-inch NPT
Minimum Bend Radius of Flexible Stainless Steel Hose: 8 inches (203 mm)
Maximum Number of 90˚ Bends Per Flexible Stainless Steel Hose:
- 2 – 90 degree bends for 28″ length
- 3 – 90 degree bends for 40″, 48″, 59″, and 71″ lengths
The flexible stainless steel hose should not be bent within 2 ½ inches (64 mm) of the connection nut at both ends.
Maximum K-Factor of Sprinkler to be connected to Sprinkler Reducing Nipple:
- ½ inch outlets: 8.0
- ¾ inch outlets: 11.2
Important Installation Information
- SprinkFLEX® products must be installed according to current, applicable National Fire Protection Association (NFPA 13, 13D, 13R, etc.) standards or equivalent standards for wet, dry, or pre-action systems. Deviations from these standards or alterations to SprinkFLEX® products or sprinklers will void any warranty. In addition, installations must meet the provision of the local authority having jurisdiction and local codes, as applicable.
- For suspended Ceiling applications, the ends of the SprinkFLEX® Bracket must be installed to the rails of an ASTM C635 ceiling installed in accordance with ASTM C636 standards.
- SprinkFLEX® Stainless Steel Sprinkler Fittings and/or the SprinkFLEX® One Piece Bracket must not be intermixed with other manufacturer’s products.
- Refer to the specific product submittal for applications and listing information. These submittals are located on the website at sprinkflex.com.
- Size the piping system to provide the minimum required flow rate for the sprinkler system.
- Flush the system to remove foreign material. Continue to flush the system until water runs clear.
- DO NOT install sprinkler system piping through heating ducts.
- DO NOT connect sprinkler system piping to domestic hot water systems. DO NOT install sprinklers where they will be exposed to temperatures that exceed the maximum ambient temperature rating for the sprinkler.
- The flexible stainless steel hose should not be bent or fluctuated up-and-down or side-to-side when it is pressurized for test.
- The flexible stainless steel hose should not be bent within 2 ½ inches/64 mm of the connection nut at both ends.
- Flexible stainless steel hose and fittings have limited flexibility and are intended only to be installed with bends at their respective minimum bend radii.
- Protect wet piping systems for freezing temperatures.
- If construction is altered, refer to applicable standards to determine if additional sprinklers are required.
- The owner is responsible for maintaining the fire protection system in proper operating condition.
- For minimum maintenance and inspection requirements, refer to NFPA 25 and the NFPA pamphlet that describes the care and maintenance of sprinkler systems. In addition, the authority having jurisdiction may have additional maintenance, testing, and inspection requirements that must be followed.