Viking MicrofastHP VK318 Technical Data Manual

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
The Viking MicrofastHP
Sprinkler VK318 is a small, thermosensitive, solder link spray sprinkler available
with various finishes and temperature ratings to meet design requirements. The
special Polyester and Electroless Nickel PTFE (ENT) coatings can be used in
decorative applications where colors are desired. In addition, the ENT coating
has been investigated for installation in corrosive environments and is Listed and
Approved as indicated in the approval chart(s).
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Refer to the Approval Chart(s) and Design Criteria for Listing and/or Approval re-
quirements that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Rated to 250 psi (17 bar) water working pressure
Factory tested hydrostatically to 500 psi (34.5 bar)
Thread size: 1/2" NPT, 15 mm BSPT
Nominal K-Factor: 5.6 U.S. (80.6 metric*)
Overall Length: 2-1/4" (58 mm)
* 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.
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
Fusible Element Assembly: Nickel Alloy
Trigger and Support: Stainless Steel UNS-S31600
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Seat and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Screw: Brass UNS-C36000
For ENT Coated Sprinklers: Belleville Spring-Exposed, Screw and Pip Cap-ENT Coated
For Polyester Coated Sprinklers: Belleville Spring-Exposed
Ordering Information: (Also refer to the current Viking price list.)
Order Viking MicrofastHP
sprinkler finish and then the appropriate suffix for the temperature rating to the sprinkler base part number.
Finish Suffix: Brass = A, Chrome = F, White Polyester = M-/W, Black Polyester = M-/B, and ENT = JN
Temperature Suffix: 165 °F (74 °C) = C, 205 °F (96 °C) = E, and 280 °F (138 °C)
For example, sprinkler VK318 with a 1/2" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 13954AC
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches:
A. Standard Wrench: Part No. 21475M/B (available since 2017).
B. Socket Wrench for Recessed Pendent Sprinklers: Part No. 13655W/B** (available since 2006)
C. Optional Protective Sprinkler Cap Remover/Escutcheon Installer Tool*** Part No. 15915 (available since 2010)
**A ½" ratchet is required (not available from Viking).
***Allows use from the floor by attaching a length of 1" diameter CPVC tubing to the tool. Ideal for sprinkler cabinets. Refer to Bulletin F_051808.
Sprinkler Cabinets:
A. Six-head capacity: Part No. 01724A (available since 1971)
B. Twelve-head capacity: Part No. 01725A (available since 1971)
Form No. F_062914 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Fusible Element Pendent High Pressure
®
Quick Response Fusible Element Pendent Sprinkler VK318 by first adding the appropriate suffix for the
®
June 2023
MicrofastHP QUICK
®
RESPONSE FUSIBLE ELEMENT
PENDENT HIGH PRESSURE
SPRINKLER VK318 (K5.6)
Replaces Form No. F_062914 Rev 20.1
(Updated material specifications.)
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