Viking Microfast M-5 Technical Data

May 21, 1998

1. PRODUCT NAME

®
VIKING Microfast Model M-5
Residential Pendent Sprinkler
5.5 K-Factor
Base Part No. 10050
Manufactured since 1997.

2. MANUFACTURER

THE VIKING CORPORATION
210 N. Industrial Park Road
Hastings, Michigan 49058, U.S.A.
Telephone: (616) 945-9501
(800) 968-9501
Fax Number: (616) 945-9599
From outside the U.S.A.:
Telephone: +1 (616) 945-9501
Fax Number: +1 (616) 945-9599
e-mail: techsvcs@vikingcorp.com

3. PRODUCT DESCRIPTION

®
The Viking Microfast Model M-5 Resi-
dential Pendent Sprinkler is a small,
high-sensitivity, glass-bulb spray sprin-
kler. The sprinkler is available in several
finishes and temperature ratings to meet
design requirements.
The sprinkler is listed for use below
smooth, flat, horizontal ceilings and
ceilings with slopes up to and includ-
ing a 6/12 pitch (26.6°), with spacings
up to 20' by 20'.
The sprinkler design, with a K-Factor of
5.5, allows efficient use of available
water supplies for the hydraulically de-
signed fire-protection system.
small, rugged 3mm glass bulb and spe-
cial deflector combine speed of opera-
tion and areas of coverage to meet the
residential sprinkler standards. During
fire conditions, the heat-sensitive liquid
in the glass bulb expands, causing the
bulb to shatter, releasing the pip cap and
sealing spring assembly. The water
flowing through the sprinkler orifice
strikes the sprinkler deflector, forming a
uniform spray pattern to extinguish or
control the fire.

4. TECHNICAL DATA

See approval charts (pages 141 c and
141 d) for listings.
Rated to 175 PSI (1 207 kPa) water
working pressure.
Factory tested pneumatically to 95 PSI
(655 kPa).
See approval charts for minimum water
supply requirements and maximum
areas of coverage.
Glass-bulb fluid temperature rated to
-65°F (-55°C).
Spring: USA Patent No. 4,570,720
Units of measure in parentheses may be approximations.
Form No. F_ 060697
TECHNICAL DATA
See pages 141 c and 141 d for
temperature ratings.
Thread Size: Nominal 1/2" (15mm) NPT
K Factor: 5.5 (7,9 metric*)
* Metric K Factor shown is for use
when pressure is measured in kPa.
When pressure is measured in BAR,
multiply the metric K Factor shown by
10.0.
Finishes: Bright Brass, Chrome-
Enloy ® (patents pending), White
(Paint), and Navajo White (Paint)
Materials:
Frame - Brass Castings UNS-C84400
Deflector - Brass UNS-C26000
Bulb - Glass
Nominal 3mm diameter
®
Seal - Teflon tape
The
Spring - Nickel alloy
Screw - Brass UNS-C36000
Pip Cap - Copper UNS-C14500
Accessories:
Refer to the "Sprinkler Accessories" of
the Viking Engineering and Design Data
book for approved sprinkler wrench and
other accessories.

5. AVAILABILITY AND SERVICE

Viking sprinklers are available through a
network of domestic, Canadian, and in-
ternational distributors. See the Yellow
Pages of the telephone directory (listed
under "Sprinklers-Automatic-Fire") or
write to The Viking Corporation.
Viking Technical Data may be found on
The Viking Corporation's Web site,
located at http://www.vikingcorp.com.
The Web site may include a more recent
edition of this Technical Data page.

6. GUARANTEES

For details of warranty, refer to Viking's
current list price schedule or contact Vi-
king directly.
Microfast
RESIDENTIAL PENDENT
SPRINKLER, 5.5 K-FACTOR

7. INSTALLATION

WARNING: Viking sprinklers are manu-
factured and tested to meet the rigid
requirements of the approving agency.
The sprinklers are designed to be in-
stalled in accordance with recognized
installation standards. Deviation from
the standards or any alteration to the
sprinkler after it leaves the factory in-
cluding, but not limited to, painting, plat-
ing, coating, or modification, may render
the sprinkler inoperative and will auto-
matically nullify the approval and any
guarantee made by The Viking Corpora-
tion.
A. Sprinklers are to be installed in ac-
cordance with the latest published
standards of the National Fire Protec-
tion Association, Factory Mutual,
Loss Prevention Council, Assemblee
Pleniere, Verband der Sachver-
sicherer or other similar organiza-
tions, and also with provisions of gov-
ernmental codes, ordinances, and
standards whenever applicable. For
conditions not specifically covered by
the standards, refer to the "Viking
Residential Installation Guide". Fi-
nal approval and acceptance of all
Residential Sprinkler Installations
must be obtained from the Author-
ity Having Jurisdiction. Residen-
tial sprinklers are special-service
sprinklers for use in one- and two-
family dwellings, mobile homes, and
residential portions of other occupan-
cies, where allowed. The use of resi-
dential sprinklers may be limited due
to occupancy and hazard. The mini-
mum flow rate indicated for a listed
area of coverage must be provided at
the sprinkler. Therefore, the system
must be hydraulically calculated.
Refer to the Authority Having Juris-
diction prior to installation.
B. Sprinklers must be handled with care.
They must be stored in a cool, dry
place in their original container.
Never install sprinklers that have
been dropped or damaged in any
way. Never install any glass-bulb
sprinkler if the bulb is cracked or if
there is a loss of liquid from the bulb.
If a glass bulb lacks the appropriate
amount of fluid, it should be set aside
and returned to Viking (or an author-
ized Viking distributor) for analysis as
soon as possible. If the sprinkler is
Replaces sprinkler page 141 a-e, dated April 9, 1998
(added reference to Viking's website and made a
correction in the approval chart on page 141 d).
Sprinkler 141 a
®
MODEL M-5