ESFR PENDENT
SPRINKLER VK510 (K25.2)
TECHNICAL DATA
Page 1 of 7
Form No. F_100102 20.01.23 Rev 20.1
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: techsvcs@vikingcorp.com
Visit the Viking website for the latest edition of this technical data page: www.vikinggroupinc.com
1. DESCRIPTION
Viking Early Suppression Fast Response (ESFR) Pendent Sprinkler VK510 in-
corporates the capability to suppress specific high-challenge fires. The addition
of a larger K-Factor allows ESFR performance at lower end-head pressures than
ESFR K14 sprinklers. K25.2 ESFR sprinklers can:
• Eliminate the use of in-rack sprinklers when protecting high-piled storage of
certain specified materials up to specific heights.*
• Reduce or eliminate the need for a system fire pump.
• Provide flexibility when sizing system piping.
Viking VK510 ESFR Pendent Sprinklers are primarily intended to protect the fol-
lowing types of storage, which tend to produce severe-challenge fires: palletized
and solid pile storage and single, double, multiple row, and portable open rack
storage (no open-top containers or solid shelves).
Viking ESFR Pendent VK510 Sprinklers provide protection of most common stor-
age materials, including:
• Encapsulated or unencapsulated Class I, II, III, and IV commodities*.
• cULus Listed for protection of cartoned unexpanded plastic commodi-
ties and FM Approved for protection of cartoned and uncartoned unex-
panded plastic commodities*.
• FM Approved for protection of exposed expanded polystyrene and ex-
posed expanded polyurethane commodities*.
In addition, some storage arrangements of rolled paper, flammable liquids,
aerosols, and rubber tires may be protected by Viking ESFR Pendent
Sprinkler VK510.
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
The 10280 VK510, ESFR Pendent Sprinkler Assembly conforms to the provision of CUAP11.03/03 standard.
CUAP11.03/03 approvals are provided by: FM Approvals Ltd. 1 Windsor Dials Windsor, Berkshire, UK. SL4 1 RS
Approval Certificate No. issued December 20, 2010.
Note:
Other International approval certificates are available upon request.
* Refer the Approval Chart and Commodity Selection and Design Criteria Overview for cULus Listing and FM Approval requirements that must be
followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: Refer to NFPA 13 or FM Global Loss Prevention Data Sheets.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1” NPT for Sprinkler 12080, 25 mm BSPT for Sprinkler 12200
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.
TABLE 1
SPRINKLER GENERAL INFORMATION
Item
Description
Sprinkler Identification
Number (SIN)
VK510
K-factor, gpm/psi
½
(lpm/bar
½
) 25.2 (363)
Thread Size
1” NPT (25mm BSPT)
Sprinkler Orientation
Pendent
Maximum Working Pressure
PSI (bar)
175 psi (12 bar)
Replaces Form No F_100102 Rev 19.2
(Revised FM Specification)
