Viking FSC-28B Technical Data Manual

Form No. F_012213 Rev 14.1 Page 1 of 8

MODEL FSC-28B

TECHNICAL DATA

BRAIDED FLEXIBLE

SPRINKLER CONNECTION

The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058

Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]

1. DESCRIPTION

Viking Model FSC-28B Braided
Flexible Sprinkler Connections are
complete assemblies intended for in­stallation into commercial suspended
ceilings with medium to heavy sup­port tee bars as described in ASTM
C635 and C636. The hose assembly
includes 28 mm diameter corrugated
stainless steel flexible hose with a
braided stainless steel exterior. The
hose assembly includes an inlet nip­ple 1” NPT or BSPT for attachment
to the sprinkler system branch pip­ing, a special outlet reducer fitting
with a 1/2” or 3/4” NPT or BSPT
straight or 90º outlet. Also included
is a support bar and brackets, which
secure the complete flex sprinkler
connection assembly to a medium or
heavy duty commercial suspended
ceiling support rail system.

The support bracket system (see Figure 4) locates and secures the sprinkler in the required position within the ceiling system. The
mounting bracket system and special outlet fittings provide a generous amount of adjustment both laterally and vertically for flush
and precise sprinkler installation.

The brackets must be attached to adequately supported tee bars in accordance with ASTM C635 and C636.

Model FSC-28B Flexible Sprinkler ConnectionFlexible Sprinkler Connection

The unique assembly of the Viking Flexible Sprinkler Connection to the piping system and the outlet sprinkler fitting is made with a
slip nut and seal design that allows assembly after forming the flex hose to proper installation shape, and the inlet and outlet end
connections are securely in place. This prevents twisting of the flex sprinkler connection during installation and provides a secure
leak-tight assembly.

The Viking Model FSC-28B Braided Flexible Sprinkler Connection standard available assembly lengths are 39-3/8” (1000mm)
and 59” (1500mm) with a straight outlet fitting and a 1/2” or 3/4” NPT sprinkler connection. Also available on special order are 90°
angle outlet fittings, also available with ½” or ¾” NPT sprinkler connection (refer to Table 1A). Upon special request, Viking Flexible
Sprinkler Connections can be manufactured to 27-9/16” (700mm), 47-1/2” (1200mm), or 71” (1800mm) lengths. Delivery times for
non standard lengths have a standard lead time of 12 weeks.

Viking Flexible Sprinkler Connections provide several installation or retrofit benefits compared to rigid sprinkler connections:

Easy Installation

•
More efficient manpower

•
Improved performance and installation quality

•
Precise and flush sprinkler location

•
Flexible installation for seismic or vibrating applications

•
Flexible installation for fast track construction projects

•
Corrosion-resistant materials

•
Fewer tools required for installation

•
Meets NFPA, EN, and LPC guidelines

•
Approved for use with suspended ceilings with medium- and heavy-duty load grids with Tee bar design per ASTM C635 and 636

•

2. LISTINGS AND APPROVALS

FM Approved: FSC-28B

Refer to Design Criteria for FM Approval requirements that must be followed.
Also refer to specific sprinkler technical data pages for sprinkler listings and other technical information.

(Removed Patent No)

Form No. F_012213 Rev 14.1 Page 2 of 8

MODEL FSC-28B

TECHNICAL DATA

BRAIDED FLEXIBLE

SPRINKLER CONNECTION

The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058

Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]

3. TECHNICAL DATA

Specifications:

Available since 2013.

Braided hose diameter: 28 mm outside diameter

•
Standard Lengths: 39-3/8” (1000mm) & 59” (1500mm)

•
Inlet 1” NPT or BSPT, male pipe threads.

•
Outlet reducer straight or 90º with 1/2” or 3/4” NPT or BSPT, female thread. See Figure 5.

•
Stainless Steel braided exterior, includes braid and corrugated tube of AISI 304 SST.

•
Corrugated tube is annealed after forming to insure relief of all material stresses and removal of all scale.

•
Limited flexibility design

•
Intended use for direct connection to fire sprinklers

•
Maximum Working Pressure = 175 PSI (12 bar)

•
Approved for wet and dry systems as noted in NFPA 13

•
Maximum ambient temperature: 300 °F (149 °C)

•

Refer to the sprinkler technical data page, as the temperature rating and maximum pressure rating of the
sprinkler may be different than the Flexible Sprinkler Connection.

Minimum bend radius: 12” (305 mm) for FM Approval

•

Material Standards:

Flexible Tube: AISI 304 Stainless Steel
Braid: AISI 304 Stainless Steel
Outlet Extension Nipple (Straight): SPPS Steel (ASTM A53 A) with yellow zinc plating
Inlet Nipple: SPPS Steel (ASTM A53 A) with yellow zinc plating
Seal: EPDM
Slip Nut: SS41 (ASTM A283 D) Steel with zinc plating
Support Brackets (all): SS41 (ASTM A572) Steel with zinc plating
Support Bar: SS41 (ASTM A283 D) Steel with zinc plating
Insulating Collar: Nylon 66

Viking Technical Data may be found on

The Viking Corporation’s Web site at

http://www.vikinggroupinc.com.

The Web site may include a more recent

edition of this Technical Data Page.

Ordering Information: (Also refer to the current Viking price list.)

The Following Model FSC-28B Flexible Sprinkler Connections are Available as Stock Assemblies:
Part No. 18731-10: 1” NPT x 1/2” NPT x 39-3/8” (1000mm) length, straight outlet, Braided
Part No. 18732-10: 1” NPT x 3/4” NPT x 39-3/8” (1000mm) length, straight outlet, Braided
Part No. 18731-15: 1” NPT x 1/2” NPT x 59” (1500mm) length, straight outlet, Braided
Part No. 18732-15: 1” NPT x 3/4” NPT x 59” (1500mm) length, straight outlet, Braided

Other flex connection assembly lengths are available upon special order. (12 week standard lead time)

Each Carton Includes (5) Complete Assemblies with the Following Components:

(5) Flexible hose assemblies, lengths 39-3/8” (1000mm) or 59” (1500mm)
(5) Outlet extension Nipple, 1/2” or 3/4” NPT or BSPT, straight as specified
(5) Inlet fittings, 1” NPT or BSPT as specified
(5) Center Bracket Assembly
(5) Center Bracket Wing Bolt, M6 X P1 X 2 3/4” (70mm)
(20) Top and Side Wing Bolts, M6 X P1 X 1” (25mm) Long
(10) Inside Brackets
(10) Outside Brackets
(5) 5/8” (16 mm) square x 23-5/64” (586 mm) long support bars
(1) Set of Installation Instructions.

Hose assemblies ordered from Viking only come with straight outlet as standard. Conversion to 90º angle outlet fitting
can be done by ordering the desired kit from Table 1A.

Form No. F_012213 Rev 14.1 Page 3 of 8

MODEL FSC-28B

TECHNICAL DATA

BRAIDED FLEXIBLE

SPRINKLER CONNECTION

The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058

Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]

4. INSTALLATION

Viking Flexible Sprinkler Connection Assemblies are manufactured and tested to meet the latest rigid requirements of the approv­ing agencies. They are designed and tested to be installed in accordance with the Approved and Listed installation instructions
as provided with the product and the recognized installation standards. Deviations from these standards or any alterations to the
support system or sprinkler after leaving the factory including, but not limited to painting, plating, coating or modification may render
the sprinkler inoperative or the support system non-compliant, automatically nullifying the approvals and any guarantee made by
The Viking Corporation.

Flexible Sprinkler Connection with Bracket System Assembly: (See figures 1 - 4)

Viking Flexible Sprinkler Connections are offered pre-assembled from the factory with the center bracket and inside/outside brack­ets attached to the square bar. SKIP TO STEP TWO, unless the standard factory assembled product is not provided.

Step 1- Slide the square bar into the center bracket assembly. Attach the two inside brackets to the square bar with two M6 x 25mm wing bolt.
Tighten the wing bolts to 30 in-lbs. (1/4 turn past hand tight). Loosely attach the two outside brackets to the inside brackets with two M6 x 25
mm wing bolts.

Step 2- Install the bracket assembly onto the main tee bars of the ceiling so that the main tee is between the inside bracket and
the outside bracket. Install the outlet extension nipple into the center bracket assembly. Locate the bracket assembly to the desired
position of the sprinkler. Tighten the wing bolt of the center bracket to 75 in. lbs. (1/2 turn past hand tight). Tighten the wing bolts
of the side brackets to 30 in-lbs. (3/4 turn past hand tight).

Step 3- Install the 1” inlet nipple into the sprinkler branch line pipe. Connect the flexible hose to the inlet nipple with a torque of
75 in-lbs. (1/2 turn past hand tight). Connect the flexible hose to the outlet extension nipple with a large smooth bend having a
minimum radius of 12” in (305 mm). Tighten the flexible hose to the outlet extension nipple with 75 in-lbs (1/2 turn past hand tight).
Multiple bends are permissible when done in accordance with Table 2.

Step 4- Attach the sprinkler to the outlet extension nipple. Use a wrench on the extension nipple and the proper sprinkler wrench
on the sprinkler when tightening.

Step 5- Installation is complete. See Figure 2 for acceptable bends.
The use of certain types of sprinklers may be limited due to occupancy and hazard. Refer to the Authority Having Jurisdiction prior

to installation.

Keep sprinklers with protective shields or caps contained within the shields or caps during installation and testing, and
any time the sprinkler is shipped or handled.

Remove plastic protective sprinkler caps or bulb shields AFTER the ceiling finish work is completed where the sprin-

kler is installed and there no longer is a potential for mechanical damage to the sprinkler operating elements. To

remove the bulb shields, simply pull the ends of the shields apart where they are snapped together. To remove caps from
frame style sprinklers, turn the caps slightly and pull them off the sprinklers. SPRINKLER CAPS OR BULB SHIELDS MUST BE
REMOVED FROM SPRINKLERS BEFORE PLACING THE SYSTEM IN SERVICE! Retain a protective cap or shield in the
spare sprinkler cabinet.

For concealed style sprinklers, the cover plate assembly can now be installed onto the sprinkler.

a. Remove the cover from the protective box, taking care not to damage the cover plate assembly.
b. From below the ceiling, gently place the base of the cover assembly over the sprinkler protruding through the ceiling opening.
c. Push the cover plate assembly onto the sprinkler until the unfinished brass flange of the cover plate base touches the ceiling.
d. Available cover plate adjustment is ½” (12.7 mm) +/- 1/4” (6.4 mm).

For frame style sprinklers with the Model E-1 or E-2 Escutcheon, or with the Model F-1 Escutcheon, press on or thread on the outer
escutcheon cup until the flanges touch the surface of the ceiling.

a. With the E-1 or E-2 Escutcheon, the maximum recess is ½” (12.7 mm). The face of the escutcheon adapter may extend up

to 11/32” (8.7 mm) beyond the edge of the escutcheon cup, resulting in 27/32” (21.4 mm) total adjustment range.

If it is necessary to remove the entire sprinkler unit, the system must be taken out of service. See section 6. INSPECTIONS, TESTS

AND MAINTENANCE and follow all warnings and instructions.

5. OPERATION

Refer to the sprinkler technical data page for the sprinkler model used with the Flexible Sprinkler Connection Assembly.