Viking Microfast M-5 Technical Data Manual

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May 21, 1998

OBSOLETE

TECHNICAL DATA

Sprinkler 141 a

Microfast® MODEL M-5

RESIDENTIAL PENDENT

SPRINKLER, 5.5 K-FACTOR

1. PRODUCT NAME

VIKING Microfast® Model M-5

Residential Pendent Sprinkler

5.5 K-Factor
Base Part No. 10050

Manufactured since 1997.

2. MANUF ACTUR ER

THE VIKING CORPORATION
210 N. Industrial Park Road

Hastings, Michigan 49058, U.S.A.
Telephone: [phone]

Fax Number: [phone]
From outside the U .S. A.:
Telephone: [phone]
Fax Number: [phone]
e-mail: techs vc s@v ik in gcorp.com

[phone]

3. PRODUCT DESC RIPTIO N

The Viking Mi crofast® Model M-5 Resi­dential Pendent Sprinkler is a small,
high-sensit ivity, glass-bulb spray sprin­kler. The sprinkler is available in several
finishes and temperatur e ratings to meet
design requ irements.

The sprinkler is listed for use below
smooth, flat, h orizontal ceilings and
ceilings with slo pes up to an d includ­ing a 6/12 p itch (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 suppl ies for the hydrau lically de­signed fire-protection system. The
small, rugged 3mm glass bulb and spe­cial deflector combine speed of opera­tion and areas of cov erage to meet the
residential sprinkler standards. During
fire conditions , the heat-sensit ive 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 1 75 PSI (1 207 kP a) 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

See pages 141 c and 141 d for

temperature ratings.

Thread Size: Nominal 1/2" (15mm) NPT

K Factor: 5.5

* 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:

Enloy® (patents pending), White
(Paint), and Navajo Wh ite (Paint)

Materials:

Frame - Brass Castings UNS-C84400
Deflector - Brass UNS-C26000
Bulb - Glass
Nominal 3mm diameter
Seal - Teflon
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.

(7,9 metric*)

Bright Brass, Chrome-

®

tape

5. AV AILABILITY AND SERVICE

Viking sprinklers are available through a
network of domes tic, Canadi an, an d in­ternational distributors. See the Yellow
Pages of the tele phon e dire ctory (l iste d
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 Vi­kin

directly.

Replaces sprinkler page 141 a-e, dated Ap ril 9, 1998
(added reference to Viking’s website and mad e a
correction in the approval chart on page 141 d).

7. INST A LLATION

WARNING:

factured and tested to meet the ri
requirements of the approving agency.
The sprinklers are designed to be in­stalled in accordance with recognized
installation standards. Deviation from
the standards or any alteration to the
sprinkler after it leaves the factory in­cludin
ing, coating, or modification, may render
the sprinkle r inoperative and wi ll auto­matically nullify the approval and any

uarantee made by The Viking Corpora­tion.
A. Sprinklers are to be installed in ac-

cordance with the latest published
standards of the National Fire Protec­tion Association, Factory Mutual,
Loss Prevention Council, Asse mblee
Pleniere, Verband der Sachver­sicherer or o ther similar or
tions, and a lso with pr ovisions of gov­ernmental codes, ordinances, and
standards whenever applicable. For
conditions not specifically covered by
the standar ds, re fer to the "Vikin
Residential Installation Guide".

nal approval and acceptance of all
Residentia l Sprinkle r Installa tions
must be obtained from the Author­ity Havi ng Juri sdicti on.

tial sprinklers are special-service
sprinklers for use in one- and two­family dwellin
residential p ortions of ot her occupan­cies, where all owed. The use of res i­dential sprinklers may be limited due
to occupancy and hazard. The mini­mum flow rate indicate d for a listed
area of cove ra
the sprinkler. Therefore, the system
must be hydrauli cally calc ulated.
Refer to the Auth ority Having Juris­diction prior to installation.

B. Sprinklers must be handled with care.

They must b e stored in a cool, dr y
place in their ori
Never install sp rinklers that have
been dropped or damaged in any
way. Never install any
sprinkler if the bulb is cracked or if
there is a loss of liquid from the bulb.
If a glass bu lb lack s the approp riate
amount of fluid, it should be set aside
and returned to Viking (or an author­ized Vikin
soon as possible. If the sprinkler is

Viking sprinklers are manu-

, but not limited to, painting, plat-

aniza-

Fi-

Residen-

s, mobile homes , and

e must be prov ided at

inal container.

lass-bulb

distributor) for analysis as

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Sprinkler 141 b

OBSOLETE

TECHNICAL DATA

May 21, 1998

Microfast® MODEL M-5

RESIDENTIAL PENDENT

SPRINKLER, 5.5 K-FACTOR

not returned to Viking, it should be de­stroyed immediately. Never install
sprinklers which have been exposed
to temperatures in excess of maxi­mum ambient te mperature allow ed.
Such sprinklers should be destr oyed
immediatel

C. Corrosion-resistant sprinklers must

be installed when subject to corrosive
atmosphe res. V iking Microfast
Model M-5 Residential Pendent
Sprinklers are not intended for use in
corrosive envi ro nm e nt s.

D. Use care when locatin

near fixtures that can generate heat.
Do not install sprinklers where the
will be exposed to temperatures that
exceed the maximum recommended
ambient tempe rature for the tem­perature rating used.

E. Sprinklers must be protected from

mechanical damage. Adequate heat
must be provided when sprinklers are
installed on wet pipe s

F. The Microf ast® Model M-5 Residential

Pendent Sprinkler must be installed
after the piping is in place to preven t
mechanical dama
stalled in the pendent position. Be­fore installing, be sure the s prinkler is
the appropriat e model and s tyle, and
has the prope r orific e size , tempe ra­ture ratin
teristics. Apply a small amount of
pipe-joint co mpound or tape to the
male threads only, taking care not to
allow a build- up of co mpound i nside
the orifice. Inst all the spri nkler on the
pipin
wrench only, while taking care not to
damage the sprinkle r operating parts.
DO NOT use the sprinkler deflector to
start or thre ad th e spri nkler into a fit­tin

.

G. After installation, the entire sprinkler

system must be tested in accordance
with the recognized installation
standards. The test is applied after

.

sprinklers

stems.

must

e, and

, and response charac-

using the special sprinkler

be in-

sprinkler inst allation to ensure that no
dama

e has occurred to the sprinkler
during shipment and installation, and
to make sure the unit has been prop­erly tightened. If a thr ead leak shou ld
occur, normally the unit must be re­moved, new pipe-joint compound or
tape applied, and then reinstalled.

®

This is due to the fact that when the
joint seal leaks, the sealin
pound is washed out of the joint.

8. MAINTENANCE

NOTICE:

maintaining the fire-protection system
and devices in proper operatin
tion. For mini mum mainte nanc e and in ­spection requirements, refer to the Na­tional Fire Protection Association Pam­phlet that describes care and mainte­nance of sprinkler s
the Authority Having Jurisdiction ma
have additional maintenance, testing,
and inspection requirements which must
be followed.
A. Sprinklers must be inspected on a

B. Sprink lers t hat have been field

C. The sprinkler discharge pattern is

The owner is responsible for

stems. In addition ,

re

ular basis for corrosion, mechani­cal damage, obstructions , pai nt, e tc.
The frequency of the inspections ma
vary due to corrosive atmospheres,
water supplies, and activity around
the device.

painted or mechanicall
must be replaced immediately. Sprin­klers showing signs of corrosion shall
be tested and/or replaced immedi­atel

as required. Residential sprin­klers that are 20 years old shall be
tested a nd/or replac ed as requir ed.
Never attempt to repair or reassem­ble a sprink ler. Sprin klers th at hav e
operated cannot be reassembled or
re-used, b ut must b e replac ed.
When replacin
new sprinklers.

critical for proper fire protection.

Nothing should be hung from, at-

sprinklers, use onl

com-

condi-

damaged

tached to, or othe rwise ob struct
the discharge pattern.

tions must be immediatel
or, if necessary, additional sprinklers
installed.

D. When replacing existing sprinklers ,

the s

stem must be removed from
service. Refer to the ap propriat e sys­tem description and/ or valv e i ns tr uc­tions. Prior to removing the system
from service, notify all Authorit ies
Havin

Jurisdi ction. Cons ideratio n
should be given to employment of a
fire patrol in the affected area.

1. Remove the system form service,

drain all water, and relieve all
pressure on the pipin

2. Using the special sprinkler wrench,

turn the unit counterclockwis e to
remove the old sp rinkle r from the
pipin

3. Install the ne w unit. Care must be

4. Place the s

E. Sprinkler s

subjected to a fire m ust be returned to
service as soon as possible. The en­tire s
damage, and repaired or replaced as
necessary. Sprinklers that ha ve been
exposed to co rrosive pr oducts of
combustion or high ambient temp era­tures, but have not operated, should
be replaced. Refer to the Authorit
Having Jurisdiction for minimum re­placement requirements.

in which it is inst al le d.

taken to ensure that the replace­ment sprink ler is the pr oper model
and st

le, and has the appropriate
orifice size, temperature ratin
and response characteristics.
Approvals and listings of the re­placement sprinkler should match
those for the e xistin
fully stocked spare sprinkler cabi­net should b e provided for t his pur­pose.

and secure al l v al ve s. Che ck an d
repair all leaks.

stem must be inspected for

stem back in service

stems that have been

All obstruc-

removed

.

sprinkler. A

,