ESFR DRY PENDENT SPRINKLER
VK512 K25.2 (GROOVED)
TECHNICAL DATA
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
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Form No. F_071221 Rev 001 12.10.2021
1. DESCRIPTION
Viking Early Suppression Fast Response (ESFR) Dry Pendent Sprinkler VK512 is
a fast response fusible element type sprinkler designed for use in storage areas
subject to freezing and supplied from a wet system only, in an adjacent heated
area. With a 25.2 (363 metric) nominal K-Factor and special deflector, this sprinkler
produces large, high-momentum water droplets in a hemispheric pattern below
the deflector. This permits penetration of the fire plume and direct wetting of the
burning fuel surface while cooling the atmosphere early in the development of a
high-challenge fire.
The dry ESFR sprinkler consists of a fusible element style ESFR sprinkler
permanently secured to a special supply nipple. The sprinkler assembly features
a sealed brass inlet that’s grooved. Also included with the ESFR dry sprinkler are
two insulating boot assemblies (optional) to help seal the clearance space around
the dry sprinkler barrel. The dry sprinkler boot assembly is intended to slow the
exchange of air between the inside and outside of the freezer (or any dry sprinkler
installation) to help mitigate condensation and humidity and temperature differentials
in the area around the sprinkler. Condensation can lead to ice build-up, which could
inhibit sprinkler operation or cause premature operation.
2. LISTINGS AND APPROVALS*
FM Approved
: Class 2026
* Refer to the Approval Chart and Design Criteria for requirements that must be followed.
3.
*
TECHNICAL DATA
Specifications:
Available since 2022
Tube diameter: 1-11/16" (43.86 mm)
Minimum Operating Pressure: Refer to NFPA 13 and FM Loss Prevention Data Sheet 8-9.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500
psi (34.5 bar).
Connections: 1-1/2" grooved
Nominal K-Factor: 25.2 U.S. (363 metric*)
Metric K-factor measurement shown is when pressure is measured in bar. When pressure is
measured in kPa, divide the metric K-factor shown by 10.0.
Deflector Diameter: 1-3/4" (44.5 mm)
Overall Length: Refer to Table 1.
Sprinkler Assembly Materials of Con
s
truction:
Sprinkler Frame Casting: QM Brass
Deflector: Phosphor Bronze UNS-C51000
Seat: Brass UNS-C36000
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Spring Base: Brass UNS-C31400 or UNS-C31600
Back-Up Nut: Brass UNS-C36000
Compression Screw: Stainless Steel UNS-S31603
Trigger and Support: Stainless Steel UNS-S31600
Fusible Element Assembly: Beryllium Nickel, coated with acrylic paint
Tube: Steel Tube ASTM A-513
Orifice: Brass UNS-C36000
Inlet: Brass UNS-C84400
Support (Internal): Brass UNS-C36000
Barrel: Steel Tube ASTM A-513, Electrodeposited Epoxy Base finish
Boot Assembly Materials of Con
s
truction:
Seal: ASTM D1056 2A0/1 4015-EL EPDM-Butyl-PE Foam Rubber OR ASTM D1056 2A1 Neoprene/EPDM/SBR OR ASTM D1056
2C1 Neoprene/EPDM
Over Seal Ring and Under Seal Ring: Cold Rolled Steel Finish: White Paint; #10 Screws: Stainless Steel
New form.
