Viking VK520 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
1. DESCRIPTION
Viking Early Suppression Fast Response (ESFR) Upright Sprinkler VK520 is a
fast response fusible element type sprinkler designed for early fire suppression.
With a 14.0 (202 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.
Viking VK520 ESFR Upright Sprinklers may be used in the protection of ordinary
types of storage. However, they are primarily intended to protect the following
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 Upright VK520 Sprinklers provide protection of most common
storage materials up to 30 ft. (9.1 m) high in buildings up to 35 ft (10.7 m) high,
including:
--Encapsulated or unencapsulated Class I, II, III, and IV commodities*.
--Cartoned unexpanded plastics*.
--Cartoned expanded plastics*.
* Refer the Approval Charts and Commodity Selection and Design Criteria Overview
for FM Approval requirements that must be followed.
In addition, some storage arrangements of rolled paper and rubber tire stor-
age may be protected by Viking ESFR Upright Sprinkler VK520.
2. LISTINGS AND APPROVALS
FM Approved: Class 2008
NYC Approved: MEA 89-92-E, Volume 18
China Approval: Approved according to China GB Standard
Refer the Approval Chart and Commodity Selection and Design Criteria
Overview for FM Approval requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: Refer to NFPA 13 and/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: 3/4" (20 mm) NPT
Nominal K-Factor: 14.0 U.S. (202 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.
Overall Length: 3-3/8" (86 mm)
Deflector Diameter: 2-7/8" (73 mm)
U.S. Patent No. 6,585,054
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Copper UNS-C19500 or Phosphor Bronze UNS-C51000
Viking ESFR Upright Sprinkler VK520 deflectors contain a copper alloy, which may easily tarnish after being exposed to air for a period
of time. This natural discoloration is due to the copper content of the deflectors reacting with oxygen and moisture in the atmosphere.
It is not uncommon for tarnish spots to appear on the deflectors within days after manufacture, with further discoloration noted over
time. The tarnish affects the surface of the deflectors and does not indicate a corrosion problem. The performance of Viking ESFR
Upright Sprinkler VK520 is not affected even with severe tarnishing of the deflector.
Lock Nut: Brass UNS-C36000
Form No. F_060298 19.11.15
TECHNICAL DATA
Rev 19.2
ESFR UPRIGHT SPRINKLER
SPRINKLER GENERAL INFORMATION
Item
Sprinkler Identification
Number (SIN)
K-factor, gpm/psi
Thread Size
Sprinkler Orientation
Maximum Working Pressure
NOTICE
SIN VK520 (K14.0)
TABLE 1
Description
VK520
(lpm/bar ) 14.0 (202)
½ ½
3/4" NPT (20 mm)
Upright
175 psi (12 bar)
Replaces Form No. F_060298 Rev 19.1
(Revised China approval; removed 19786)
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