Viking MICROFAST VK612 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 Microfast
®
Sidewall HP Sprinkler VK612 is thermosensitive spray sprinklers available in sev-
eral different finishes and temperature ratings to meet varying design requirements.
The orifice design allows efficient use of available water supplies for hydraulically
designed fire-protection systems. The glass bulb operating element and special
deflector characteristics meet the challenges of quick response extended coverage
standards.
The special Polyester and 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/approved as indicated in the
Approval Chart(s).
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Refer to the Approval Chart and Design Criteria for cULus Listing requirements that
must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: Refer to the Approval Chart.
Maximum Working Pressure: 250 psi (17 bar) wwp.
Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1/2" (15 mm) NPT
Nominal K-Factor: 5.6 U.S. (80.6 metric
* Metric K-factor measurement shown is in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-11/16" (68 mm)
Material Standards:
Sprinkler Frame: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
Bulb: Glass, nominal 3 mm diameter
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Compression Screw: Brass UNS-C36000
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
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 Sprinkler VK612 by first adding the appropriate suffix for the sprinkler finish and then the appropriate suffix for the tempera-
ture 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: 135 °F (57 °C) = A, 155 °F (68 °C) = B, 175 °F (79 °C) = D
For example, sprinkler VK612 with a Brass finish and a 155 °F (68 °C) temperature rating = Part No. 12295AB.
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 sprinklers: Part No. 13655W/B
**A ½" ratchet is required (not available from Viking).
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_030203 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Standard/Quick Response Extended Coverage Horizontal
)
*
August 2023
EXTENDED COVERAGE
For Light Hazard Occupancies Only
(available since 2006)
**
Page 1 of 6
MICROFAST SR/QR
®
HSW SPRINKLER
VK612 (K5.6)
Replaces Form No. F_030203 Rev 20.1
(updated material specifications)