ESFR PENDENT
SPRINKLER VK506 (K22.4)
TECHNICAL DATA
Form No. F_081612 18.10.11 Rev 18.2
Page 1 of 5
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]
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 VK506 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. K22.4 ESFR sprinklers can:
• Eliminate the use of in-rack sprinklers when protecting high-piled storage of
certain specified materials up to 40 ft. (12.2 m) with ceilings up to 45 ft. (13.7
m)*
• Reduce or eliminate the need for a system fire pump.
• Provide flexibility when sizing system piping.
Viking VK506 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 VK506 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*.
* Refer the Approval Charts and Commodity Selection and Design Criteria Overview
for cULus Listing and FM Approval requirements that must be followed.
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
Successfully meets new UL 1767 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
NOTE:
Other International approval certificates are available upon request.
Refer to the Approval Charts and Commondity Selection and Design Criteria Overview for cULus Listing and FM Approval require-
ments that must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2013.
Minimum Operating Pressure: Refer to NFPA 13 or FM Global Loss Preven-tion Data Sheets.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1” NPT for Sprinkler 18493, 25 mm BSPT for Sprinkler 18494
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” (44.5 mm)
Covered by one or more of the following patents: US5,829,532; US6,059,044; US6,336,509; US6,502,643; US6,868,917; AU722593; GB2336777
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.
Replaces Form No. F_081612 Rev 18.1
(Replaced design criteria tables; added P65 Warning.)
TABLE 1
SPRINKLER GENERAL INFORMATION
Item
Description
Sprinkler Identification
Number (SIN)
VK506
K-factor, gpm/psi
½
(lpm/bar
½
)
22.4 (320)
Thread Size
1” NPT (25 mm)
Sprinkler Orientation
Pendent
Maximum Working Pressure
175 psi (12 bar)
