Viking 12080 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 VK510
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. K25.2 sprinklers can:
• Provide flexibility of fire protection designs.
• Reduce or eliminate the need for a system fire pump.
• 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 VK510 is a Special Sprinkler as defined by
the National Fire Protection Association (NFPA 13, 2022 Ed.-Section 15.2).
Viking ESFR Pendent Sprinklers VK510 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 VK510 is listed to utilize a
minimum aisle width of 6'-0" (UL - 40' storage or FM - 45' storage).
Viking ESFR Pendent Sprinklers VK510 provide protection of most common
storage materials, including:
• Encapsulated or unencapsulated Class I, II, III, and IV commodities*.
• cULus 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.
2. LISTINGS AND APPROVALS*
cULus Listed: Category VNWH (Listed as a Specific Application ESFR
Sprinkler)
FM Approved: Class 2026
VdS Approved: Certificate G4040015
LPCB Approved: Ref. No. 096g/01
China Approval: Approved according to China GB Standard
* 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: 25.2 U.S. (363 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
Form No. F_121022 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
VK510 (K25.2)
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 7
Description
VK510
25.2 (363)
1" NPT (25 mm)
Pendent
175 psi (12 bar)