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: [email protected]

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: [email protected]

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: [email protected]

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.

Form No. F_012213 Rev 14.1 Page 4 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: [email protected]

The Following Kits are Available for Replacement Components:

These kits may be ordered in addition to the above for replacing components as required. A 49-3/16” (1,250 mm) long
support bar is available when the main support beams are spaced at 4 ft. (1,219 mm). These must be ordered separate

from the standard flexible Sprinkler Connection Assembly.

TABLE 1A:

18725 1/2” x 28 mm hose 90º angle fitting kit (1) / package

18726 3/4” x 28 mm hose 90º angle fitting kit (1) / package

TABLE 1:

18282 Square Bar for 2 Foot (600mm) Spacing

18283 Square Bar for 4 Foot (1200mm) Spacing

18469 Side Bracket Assembly (Includes Side Bracket, 18287 and 14401)

18286 Center Bracket Assembly (Includes Center Bracket, 18292 and 18293)

18287 Wing Bolt, M6 x 1” (25mm)

18727 Outlet Reducing Nipple, 1/2” NPT

18728 Outlet Reducing Nipple, 3/4” NPT

18292 Wing Bolt, M6 x 2 3/4” (70mm)

18293 Retaining O-RIng

14386 EPDM Seal for 28 mm hose assembly

14378 Inlet Nipple, 1” NPT

Hose Assembly Configurations of Standard Offering Include:

1. Braided 28 mm flex sprinkler hose.

2. Outlet fitting, straight.

3. Outlet size 1/2” or 3/4” NPT or BSPT.

4. Inlet connection 1” NPT or BSPT.
Hose assemblies ordered from Viking only come with straight outlet as standard.

KITS AVAILABLE TO CONVERT TO ANGLE OUTLET

KITS AVAILABLE FOR REPLACEMENT COMPONENTS

TABLE 2: MODEL FSC-28B FRICTION LOSS DATA WITH 12” (305 mm) MINIMUM BEND RADIUS

Outlet Size

Straight or 90º

Hose Length

with Fittings

Equivalent Length of FM 1”

Schedule 40 Pipe (ft.)

Equivalent Length of FM

1” Schedule 40 Pipe (m)

Maximum Number

of 90° Bends

1/2” 39-3/8“ 38 ft 11.6 m 2

3/4” NPT 39-3/8“ 26.9 ft 8.2 m 1

1/2” 59” 52.4 ft 15.9 m 3

3/4” NPT 59” 51.7 ft 15.8 m 3

Indicates Standard Viking Offering.
All other lengths have a standard lead time of 12 weeks. For Friction loss data on non-standard
lengths contact Viking Technical Services at 877-384-5464

Form No. F_012213 Rev 14.1 Page 5 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: [email protected]

6. INSPECTIONS, TESTS AND MAINTENANCE

The owner is responsible for maintaining the fire protection system and devices in proper operating condition. For minimum main-

A. Sprinklers must be inspected on a regular basis for corrosion, mechanical damage, obstructions, paint, etc. The frequency of

B. Sprinklers that have been field painted or mechanically damaged must be replaced immediately. Sprinklers showing signs of

C. The sprinkler discharge pattern is critical for proper fire protection. Therefore, nothing should be hung from, attached to, or other-

D. When replacing existing sprinklers, the system must be removed from service. Refer to the appropriate system description and/

E. Sprinkler systems that have been subjected to a fire must be returned to service as soon as possible. The entire system must

tenance and inspection requirements, refer to the latest edition of Viking technical data and the NFPA standard that de­scribes care and maintenance of sprinkler systems. The Authority Having Jurisdiction may have additional maintenance,
testing, and inspection requirements that must be followed.

inspections may vary due to corrosive atmospheres, water supplies, and activity around the device.

corrosion shall be tested and/or replaced immediately as required. Installation standards require sprinklers to be tested and, if
necessary, replaced after a specified term of service. Refer to the installation standards (e.g., NFPA 25) and the Authority Having
Jurisdiction for the specified period of time after which testing and/or replacement is required. Sprinklers that have operated
cannot be reassembled or re-used, but must be replaced. When replacement is necessary, use only new sprinklers.

wise obstruct the discharge pattern. All obstructions must be immediately removed or, if necessary, additional sprinklers installed.

or valve instructions. Prior to removing the system from service, notify all Authorities Having Jurisdiction. Consideration should
be given to employment of a fire patrol in the affected area.

1. Remove the system from service, drain all water, and relieve all pressure on the piping.

2. Using the special sprinkler wrench, remove the old sprinkler and install the new unit. Care must be taken to ensure that
the replacement sprinkler is the proper model and style, with the appropriate orifice size, temperature rating, and response
characteristics. A fully stocked spare sprinkler cabinet should be provided for this purpose.

3. Place the system back in service and secure all valves. Check for and repair all leaks.

be inspected for damage, and repaired or replaced as necessary. Sprinklers that have been exposed to corrosive products of
combustion or high ambient temperatures, but have not operated, should be replaced. Refer to the Authority Having Jurisdiction
for minimum replacement requirements.

7. AVAILABILITY

Viking Flexible Sprinkler Connection Assemblies are available through a network of domestic and international distributors. See The
Viking Corporation web site for the closest distributor or contact The Viking Corporation.

8. GUARANTEE

For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.

DESIGN CRITERIA

FM Approval Requirements:

• Approved for use in ceilings with medium and heavy load grids (ASTM C635 and C636).

• Meets NFPA 13, NFPA 13D and NFPA 13R guidelines.

• Intended for use in wet or dry systems.

• In suspended ceilings, outlet reducer must be secured to the ceiling support system with brackets supplied.In suspended ceilings, outlet reducer must be secured to the ceiling support system with brackets supplied.

Hydraulic calculations for NFPA systems must include the values in Table 2 using the maximum number of bends as in­dicated. Authorities Having Jurisdiction will require proper hydraulic calculations and inspect for proper bend radius and
maximum quantity of bends as indicated in the tables. Note that FM minimum bend radius is 12” (305 mm).

:Refer to the specific sprinkler data page for the sprinkler model used with the Flexible Sprinkler Drop.

• Minimum Inside Bend Radius: 12” (305 mm) for FM

• Maximum Sprinkler K-Factor: 5.6 U.S. (80 metric) for the 1/2” outlet, 8.0 U.S. (115 metric) for the 3/4” outlet

• Maximum Number of Bends per Hose: Refer to Table 2.

• Repeated bending of one portion of the flexible tube before installation may cause breakage or loss of resisting pres­sure.

• When using concealed sprinklers, they must be installed in neutral or negative pressure plenums only.

IMPORTANT: Always refer to Bulletin Form No. F_091699 - Care and Handling of Sprinklers. Also refer to the appropriate
sprinkler data page. Viking sprinklers and Flexible Sprinkler Drops are designed to be installed in accordance with the latestViking sprinklers and Flexible Sprinkler Drops are designed to be installed in accordance with the latest
edition of Viking technical data, the latest standards of NFPA, FM Global, LPCB, APSAD, VdS or other similar organizations,
and also with the provisions of governmental codes, ordinances, and standards whenever applicable. The use of certain
types of sprinklers may be limited due to occupancy and hazard. Refer to the Authority Having Jurisdiction prior to installa­tion.

Form No. F_012213 Rev 14.1 Page 6 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: [email protected]

Acceptable

Figure 1: Installation Schematic

Not Acceptable Not Acceptable

Figure 2: Bends

Form No. F_012213 Rev 14.1 Page 7 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: [email protected]

Figure 3: Flexible Sprinkler Connection Support System

No. Description

1 Top Wing Bolt, M6 X P1 x 1in (25mm) Long

2 Square Bar

3 Side Wing Bolt, M6 X P1 X 1in (25mm) Long

4 Outside Bracket

5 Inside Bracket

6 Center Bracket Assembly

7 Center Bracket Wing Bolt M6 X P1 X 2 3/4in (70mm) Long

Form No. F_012213 Rev 14.1 Page 8 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: [email protected]

Figure 4: Flexible Sprinkler Connection Installed With Bracket System Assembly

1” NPT Inlet x 1/2” NPT Straight Outlet, Braided

1” NPT Inlet x 3/4” NPT Straight Outlet, Braided

Figure 5: Flexible Sprinkler Connection

1” NPT Inlet x 1/2” NPT 90º Outlet, Braided

1” NPT Inlet x 3/4” NPT 90º Outlet, Braided

Figure 6: Flexible Sprinkler Connection

(Removed Patent No)