Viking VK506 Technical Bulletin

Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
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1. DESCRIPTION
Viking Early Suppression Fast Response (ESFR) Pendent Sprinkler VK506
incorporates the capability to suppress specific high-challenge fires. The larger
K-Factor allows protection of higher hazard commodities at greater ceiling heights
with lower end-head pressures. K22.4 sprinklers can:
• Provide flexibility of fire protection designs.
• Eliminate the use of in-rack sprinklers when protecting high piled storage of
certain specified materials up to:
UL (Refer to Table 4): 40 ft. (12,2 m) with ceilings up to 45 ft. (13,7 m)*
FM (Refer to Table 5): 45 ft. (13,7 m) with ceilings up to 50 ft. (15,2 m)*
NFPA 13 (Refer to Table 6): The VK506 is a Special Sprinkler as defined by
the National Fire Protection Association (NFPA 13, 2022 Ed.-Section 15.2).
Viking ESFR Pendent Sprinklers VK506 are primarily intended to protect the
following types of storage, which tend to produce severe-challenge fires: palletized
and solid pile storage as well as single, double, multiple, and portable open rack
storage (no open-top containers or solid shelves). The VK506 is listed to utilize a
minimum aisle width of 6'-0" (UL - 40' storage or FM - 45' storage).
Viking ESFR Pendent Sprinklers VK506 provide protection of most common
storage materials, including:
• Encapsulated or unencapsulated Class I, II, III, and IV commodities*.
• UL Listed for protection of cartoned nonexpanded** Group A plastic
commodities*.
• FM Approved for protection of cartoned unexpanded** plastic commodities.*
* Refer the Approval Chart and Commodity Selection and Design Criteria Overview for Listing
and Approval requirements that must be followed.
** The terms nonexpanded and unexpanded are equivalent.
In addition, some storage arrangements of rolled paper, flammable liquids,
aerosols, and rubber tires may be protected by Viking ESFR Pendent Sprinkler
VK506.
2. LISTINGS AND APPROVALS*
cULus Listed: Category VNWH (Listed as a Specific Application ESFR Sprinkler)
Successfully meets UL 199 test standard and compliance program for ESFR sprinklers installed in rack storage with
high clearances to ceiling (20 ft or greater)
FM Approved: Class 2026
* Refer the Approval Chart and Commodity Selection and Design Criteria Overview for Listing and Approval requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1" NPT or 25 mm BSPT (Refer to Table 2)
Nominal K-factor: 22.4 U.S. (320 metric*)
* Metric K-factor measurement shown is in bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Overall Length: 3-3/16" (81 mm)
Deflector Diameter: 1-3/4" (45 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
Seat: Copper UNS-C11000 and Stainless Steel UNS-S30400
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Compression Screw: Stainless Steel UNS-S31603
Trigger and Support: Stainless Steel UNS-S31600
Fusible Element Assembly: Beryllium nickel coated with black acrylic paint
Ordering Information: Refer to Table 2
Form No. F_120922 Rev 01
TECHNICAL BULLETIN
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
December 2022
ESFR PENDENT SPRINKLER
UL: SPECIFIC APPLICATION ESFR SPRINKLER
FM: STORAGE SPRINKLER
NFPA: SPECIAL SPRINKLER
VK506 (K22.4)
TABLE 1
SPRINKLER GENERAL INFORMATION
Item
Sprinkler Identification
Number (SIN)
K-factor, gpm/psi (lpm/bar )
½ ½
Thread Size
Sprinkler Orientation
Maximum Working Pressure
Page 1 of 6
Description
VK506
22.4 (320)
1" NPT (25 mm)
Pendent
175 psi (12 bar)