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MODEL VKFD25U

PRE-ASSEMBLED FLEXIBLE 

SPRINKLER DROP

ASSEMBLIES 

(UNBRAIDED) 

TECHNICAL DATA

September 17, 2009

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

Telephone: 269-945-9501  Technical Services: 877-384-5464  Fax: 269-818-1680  Email: [email protected]

1.  DESCRIPTION

Viking Model VKFD25U Flexible Sprinkler Drop Assemblies 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 
25 mm diameter corrugated stainless steel flexible hose. The hose assembly includes 
an inlet nipple 1” NPT for attachment to the sprinkler system branch piping, a special 
outlet reducer fitting with a straight outlet, pre-assembled with a ½” NPT sprinkler. Also 
included is a support bar and brackets, which secure the complete flex sprinkler drop as-
sembly to a medium or heavy duty commercial suspended ceiling support rail system. 

Specific Viking sprinklers are pre-packaged (10) units per carton factory installed on to 
the outlet reducer fittings along with the outlet reducer support bracket and are pres-
sure tested. Refer to Table 1 for sprinkler VK302 and VK462 available pre-packaged
as Flexible Sprinkler Drop Assemblies. Frame style sprinkler VK302 is available with
the slip-on Model E-1 or threaded Model E-2 Adjustable Recessed Escutcheon, or with
the Model F-1 Adjustable Escutcheon. 

Rail support brackets are included; short brackets for use with frame style sprinkler VK302 and tall brackets for use with concealed 
style sprinkler VK462. The support bracket system (see Figure 3) locates and secures the sprinkler in the required position within 
the ceiling system. Note: When using short brackets, the ceiling tile must be installed before attaching the brackets to the ceiling’s 
main tee bar supports. Tall brackets are used for typical concealed sprinklers; the mounting bracket system and special outlet fit-
tings provide a generous amount of adjustment both laterally and vertically for flush and precise sprinkler installation. Note: The 
brackets must be attached to the ceiling’s main tee bar supports, not to the cross support rail members. 

The unique assembly of the Viking Flexible Sprinkler Drop 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 drop during installation and provides a secure leak-tight assembly. 

The Viking Model VKFD25U Pre-Assembled Flexible Sprinkler Drop standard available assembly length is 39-3/8” with a straight 
outlet fitting and a ½” NPT sprinkler connection. Upon special request, Viking Flexible Sprinkler Drops can be manufactured to the 
following lengths: 27-9/16”, 59”, or 71”. Delivery times for special request items are extended; consult your Viking distributor for 
availability and delivery. 
Viking Flexible Sprinkler Drops provide several installation or retrofit benefits compared to rigid sprinkler drops:

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
100% factory tested
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

cULus Listed:

 Category VENF

Refer to Design Criteria on page 138l for cULus Listing requirements that must be followed.
Also refer to specific sprinkler technical data pages for sprinkler listings and other technical information.










Form No. F_091509

Sprinkler 138g

New page 138g-l, issued September 17, 2009. 

 

Model VKFD25U Flexible Sprinkler Drop 

(Shown with a Viking Concealed Sprinkler)

Содержание VKFD25U

Страница 1: ...klers the mounting bracket system and special outlet fit tings provide a generous amount of adjustment both laterally and vertically for flush and precise sprinkler installation Note The brackets must be attached to the ceiling s main tee bar supports not to the cross support rail members The unique assembly of the Viking Flexible Sprinkler Drop to the piping system and the outlet sprinkler fittin...

Страница 2: ...port bracket bracket square nut and wing bolt assembled over straight outlet fitting sprinklers see Table 1 installed and leak tested into the outlet fitting as speci fied 10 per kit Instructions 1 For frame style sprinkler VK302 add the sprinkler Finish and Temperature Rating Suffix to the Sprinkler Base Part No A For Chrome sprinkler rated 135 F 57 C Add the suffix FA For White sprinkler rated 1...

Страница 3: ...rder Separately Optional 4 Bend Radius Gauge Tool Part No 15450 plastic Optional 4 Fixed Radius Clip Part No 14403 plastic The Following Kits are Available for Replacement Components Note 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 order...

Страница 4: ...tandards Deviations from these standards or any alterations to the sup port 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 The use of certain types of sprinklers may be l...

Страница 5: ...inspection requirements that must be followed A Sprinklers must be inspected on a regular basis for corrosion mechanical damage obstructions paint etc The frequency of inspections may vary due to corrosive atmospheres water supplies and activity around the device B Sprinklers that have been field painted or mechanically damaged must be replaced immediately Sprinklers showing signs of corrosion sha...

Страница 6: ...nspect for proper bend radii and maximum quantity of bends as indicated in the table Refer to the Viking Flex Drop Installation and Design Manual Form No F_112107 for proper application and installation of Flexible Sprinkler Drops NOTE Refer to the specific sprinkler data page for the sprinkler model used with the Flexible Sprinkler Drop CAUTIONS Minimum Inside Bend Radius 4 102 mm Static cULus un...

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