Viking VK503 Technical Data Manual

March 14, 2008
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Telephone: 269-945-9501 Technical Services 877-384-5464 Fax: 269-945-4495 Email: techsvcs@vikingcorp.com

1. DESCRIPTION

Viking Early Suppression Fast Response (ESFR) Pendent Sprinkler VK503 is a fast
response fusible element type sprinkler designed for early fire suppression. With a
16.8 (242 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 Sprinkler VK503 may be used in the protection of ordinary types of storage.
However, it is primarily intended to protect the following types of storage, which tend
to produce severe-challenge fires: palletized and solid pile storage and single, dou-
ble, multiple row, and portable open rack storage (no open-top containers or solid
shelves).
Viking ESFR Pendent Sprinkler VK503 provides protection of most common storage
materials, including:
--Encapsulated or unencapsulated Class I, II, III, and IV commodities*.
--Cartoned and uncartoned unexpanded plastics*.
--Cartoned expanded plastics*.
* Refer the Approval Chart on page 123c and Design Criteria on page 123d for cULus and FM approval requirements that must be followed.
In addition, some storage arrangements of rolled paper, aerosols, and rubber tires may be protected by Viking ESFR Pendent
Sprinkler VK503.

2. LISTINGS AND APPROVALS

cULus Listed: Category VNWH
FM Approved: Class 2027
NYC Approved: MEA 89-92-E, Volume 41
Refer the Approval Chart on page 123c and Design Criteria on page 123d for cULus and FM approval requirements that must be
followed.
3. TECHNICAL DATA
Specifi cations:
Available since 2007.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically
to 500 psi (34.5 bar).
Thread size: 3/4" NPT or 20 mm BSP
Nominal K-Factor: 16.8 U.S. (242 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: 2-7/8" (73 mm)
Deflector Diameter: 1-3/4" (44.5 mm)
Covered by one or more of the following patents: US6,502,643; US6,868,917; AU722593; GB2336777
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
Seat and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with Teflon Tape
Compression Screw: Stainless Steel UNS-S31603
Trigger and Support: Stainless Steel UNS-S31600
Fusible Element Assembly: Beryllium Nickel, coated with black acrylic paint.
Form No. F_120106
TECHNICAL DATA
Replaces page 123a-f, dated January 4, 2008.
(Updated the materials list, added MEA/NYC Approval.)
ESFR PENDENT SPRINKLER
VK503 (K16.8)
Viking Technical Data may be found on
The Viking Corporation's Web site at
http://www.vikinggroupinc.com.
The Web site may include a more recent
edition of this Technical Data Page.
Sprinkler 123a