Viking VK5141 Technical Data Manual

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 VK5141 is a
fast response glass bulb type sprinkler designed for use in storage areas prone
to high-challenge fires. With a 28.0 (404 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.
Refer the Approval Chart and Design Criteria Listing requirements that must be
followed.
2. LISTINGS AND APPROVALS
UL Listed: Category VNWH (Listed as a Specific Application ESFR
Sprinkler)
3. TECHNICAL DATA
Specifications:
Available since 2024
Maximum Working Pressure: 175 psi (12 bar).
Factory tested pneumatically to 95 psi (6.55 bar)
Thread size: 1" NPT or 25 mm BSPT
Nominal K-Factor: 28.0 U.S. (404 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: 3-1/4" (83 mm)
Deflector Diameter: 1-3/4" (45 mm)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Material Standards:
Frame: Brass CW602N
Deflector: Phosphor Bronze UNS-C51000
Pip cap and Insert assembly: Copper UNS-C11000, Stainless Steel UNS-
S30400 and UNS-S31600
Belleville Spring Sealing Assembly: Nickel Beryllium, coated on both
sides with PTFE Tape
Compression Screw: Brass, UNS-C36000
Bulb: Glass, Nominal 3mm diameter
Frame
Glass bulb
Deflector
Figure 1: Sprinkler Components
Form No. F_080622 Rev 03
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Belleville Spring
Sealing Assemby
(internal)
Pip cap and insert
assembly
Compression
Screw
January 2024
SPECIFIC APPLICATION
ESFR PENDENT
SPRINKLER VK5141 (K28.0)
SPRINKLER GENERAL INFORMATION
Item
Sprinkler Identification
Number (SIN)
K-factor, gpm/psi
Thread Size
Sprinkler Orientation
Maximum Working Pressure
PSI (bar)
17/8"
(48 mm)
13/8"
(35 mm)
Dimensions are
approximate.
Figure 2: Sprinkler Dimensions
Replaces Form No. F_080622 Rev 02
(Revised part numbers and images)
Page 1 of 6
TABLE 1
Description
VK5141
(lpm/bar ) 28.0 (404)
½ ½
1" NPT
25 mm BSPT
Pendent
175 psi (12 bar)
1³/4"
(45 mm)