Viking VK531, VK5311 Technical Data Manual

QUICK RESPONSE

TECHNICAL DATA

EXTRA-LARGE ORIFICE

UPRIGHT SPRINKLER

VK531 (STORAGE-DENSITY/AREA)

The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058

Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]

Visit the Viking website for the latest edition of this technical data page: www.vikinggroupinc.com

1. DESCRIPTION

The Viking Quick Response Extra-Large Orifice Upright Sprinkler VK531 is a ther­mosensitive glass bulb spray sprinkler available in several different finishes and
temperature ratings to meet design requirements. The special Polyester, Electroless
Nickel PTFE (ENT), and PTFE coatings can be used in decorative applications where
colors are desired. In addition, these coatings have been investigated for installa­tion in corrosive environments and are listed/approved as indicated in the Approval
Charts.

The extra-large orifice provides greater flows at lower pressures than standard
orifice or large orifice sprinklers. This feature allows reduced pipe sizing for hy­draulically calculated sprinkler systems, which require high densities of water.
Viking Standard Response Extra-Large Orifice Sprinklers may eliminate the
need for a fire pump or reduce the size of the pump if it is required. On existing
systems, replacing large orifice sprinklers with extra-large orifice sprinklers may
provide the higher densities required to allow an increase in the hazard classifica­tion of an occupancy.

Viking Quick Response Extra-Large Orifice Upright Sprinkler VK531 may be
ordered and/or used as an open sprinkler (glass bulb and pip cap assembly re­moved) on deluge systems. Refer to Ordering Instructions below.

2. LISTINGS AND APPROVALS

NOTE: As of May 2018 all logos have been removed from the
wrench boss.

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Page 1 of 5

cULus Listed: Category VNIV

FM Approved: Class 2020

VdS Approved: Certificate G413059, G413060

LPCB Approved: Certificate 096e/14

Refer to Approval Chart 1 and Design Criteria on page 3 for cULus Listing requirements, and refer to Approval Chart 2 and Design
Criteria on page 4 for FM Approval requirements that must be followed.

3. TECHNICAL DATA

Specications:

Available since 2000.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: See Approval Charts
Nominal K-Factor: 11.2 U.S. (161.3 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.

Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-5/16” (58.7 mm)

Material Standards:

Sprinkler Frame: Brass UNS-C84400
Deflector: Brass UNS-C26000
Bulb: Glass, nominal 3 mm diameter
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Compression Screw: Brass UNS-C36000
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with Teflon Tape
For Polyester Coated Sprinklers: Belleville Spring-Exposed
For ENT Coated Sprinkler: Belleville Spring-Exposed, Screw and Pipcap-ENT plated.

Ordering Information: (Also refer to the current Viking price list.)
Order Quick Response Extra-Large Orifice Upright Sprinkler VK531 by first adding the appropriate suffix for the sprinkler finish

and then the appropriate suffix for the temperature rating to the sprinkler base part number.

Form No. F_120699 18.10.11 Rev 18.2.P65

Replaces Form No. F_120699 Rev 18.2

(Added P65 Warning.)

Page 2 of 5

QUICK RESPONSE

TECHNICAL DATA

EXTRA-LARGE ORIFICE

UPRIGHT SPRINKLER

VK531 (STORAGE-DENSITY/AREA)

The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058

Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]

Visit the Viking website for the latest edition of this technical data page: www.vikinggroupinc.com

Finish Suffix: Brass = A, Chrome = F, White Polyester = M-/W, Black Polyester = M-/B, ENT = JN
Temperature Suffix: 155 °F (68 °C) = B, 175 °F (79 °F) = D, 200 °F (93 °C) = E, 286 °F (141 °C) = G, OPEN = Z (PTFE only).
For example, sprinkler VK531 with a Brass finish and a 155 °F (68 °C) temperature rating = Part No. 10633AB

Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)

Sprinkler Wrenches:

A. Standard Wrench: Part No. 05118CW/B (available since 1981).
B. Wrench for coated sprinklers: Part No. 11663W/B** (available since 2001)

**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)

4. INSTALLATION

Refer to appropriate NFPA Installation Standards.

5. OPERATION

During fire conditions, when the temperature around the sprinkler reaches its operating temperature, the heat-sensitive liquid in
the glass bulb expands, causing the bulb to shatter, releasing the pip cap and sealing spring assembly. Water flowing through the
sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern to extin- guish or control the fire.

6. INSPECTIONS, TESTS AND MAINTENANCE

Refer to NFPA 25 for Inspection, Testing and Maintenance requirements.

7. AVAILABILITY

The Viking Quick Response Extra-Large Orifice Upright Sprinkler is available through a network of domestic and international dis­tributors. See The Viking Corporation web site for the closest distributor or contact The Viking Corporation.

8. GUARANTEE

For details of warranty, refer to Viking’s current list price schedule or
contact Viking directly.

TABLE 1: AVAILABLE SPRINKLER TEMPERATURE RATINGS AND FINISHES

Sprinkler Temperature

Classification

Sprinkler Nominal

Temperature Rating

1

Ceiling Temperature

2

Maximum Ambient

Bulb Color

Ordinary 155 °F (68 °C) 100 °F (38 °C) Red
Intermediate 175 °F (79 °C) 150 °F (65 °C) Yellow
Intermediate 200 °F (93 °C) 150 °F (65 °C) Green

High 286 °F (141 °C) 225 °F (107 °C) Blue

Sprinkler Finishes: Brass, Chrome, White Polyester, Black Polyester, and ENT
Corrosion-Resistant Coatings3: White Polyester, and Black Polyester in all temperature ratings. ENT in all temperature ratings

except 135°F (57°C).

Footnotes

1

The sprinkler temperature rating is stamped on the deflector.

2

Based on NFPA-13. Other limits may apply, depending on fire loading, sprinkler location, and other requirements of the Authority Having Jurisdiction.

Refer to specific installation standards.

3

The corrosion-resistant coatings have passed the standard corrosion test required by the approving agencies indicated in the Approval Charts. These

tests cannot and do not represent all possible corrosive environments. Prior to installation, verify through the end-user that the coatings are compat­ible with or suitable for the proposed environment. For automatic sprinklers, the coatings indicated are applied to the exposed exterior surfaces only.
Note that the spring is exposed on sprinklers with Polyester, and ENT. For all ENT coated sprinklers, the waterway is coated.

Form No. F_120699 18.10.11 Rev 18.2.P65