Correspondence February 11, 2005 c=!'
CITY OF TIGARD
OP EON
Firestop CO.
Bruce D. Pearson
7000 SW Hampton
Tigard, OR 97223
RE: HEMCON, FIRE SPRINKLER SYSTEM
Project Information
Building Permit: BUP2005 -00038 Construction Type: VN
Tenant Name: Hemcon Occupancy Type: B
Address: 10575 SW Cascade Ave Occupant Load: NA
Area: NA Stories: 1
The plan review was performed under the State of Oregon Structural Specialty Code (OSSC)
2004 edition, Oregon Fire Code 2004 edition; and NFPA 13. The submitted plans are approved
subject to the following.
HYDROSTATIC TESTING
Hydrostatic testing of the system shall occur at sprinkler final. The contractor's
material and test certificate required by NFPA 13, 16.1 shall be completed and signed
by both the installer and building owner.
TESTING: - Section 16.2.1
1. Unless permitted by 16.2.1.2 through 16.2.1.6, all piping and attached appurtenances
subjected to system working pressure shall be hydrostatically tested at 200 psi (13.8 bar)
and shall maintain that pressure without loss for 2 hours. Loss shall be determined by a
drop in gauge pressure or visual leakage. The test pressure shall be read from a gauge
located at the low elevation point of the system or portion being tested.
2. 16.2.1.2: Portions of systems normally subjected to system working pressures in excess
of 150 psi (10.4 bar) shall be tested as described in 10 -2.2.1 at a pressure of 50 psi (3.5
bar) in excess of system working pressure.
3. 16.2.1.3: Where cold weather will not permit testing with water, an interim air test shall
be permitted to be conducted as described in 16.2.3.
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
4. 16.2.1.4: Modifications affecting 20 or fewer sprinklers shall not require testing in excess
of system working pressure.
5. 16.2.1.5: Where addition or modification is made to an existing system affecting more
than 20 sprinklers, the new portion shall be isolated and tested at not less than 200 psi
(13.8 bar) for 2 hours.
6. 16.2.1.6: Modifications that cannot be isolated, such as relocated drops, shall not require
testing in excess of system working pressure.
WATERFLOWALARMS: - Section 6.9.1
7. Water flow alarm apparatus shall be listed for the service and so constructed and installed
that any flow of water from a sprinkler system equal to or greater than that from a single
automatic sprinkler of the smallest orifice size installed on the system will result in an
audible alarm on the premises within 5 minutes after such flow begins and until such
flow stops.
SPRINKLER SYSTEM MONITORING: - OSSC Section 901.6.
8. All valves controlling the water supply for automatic sprinkler systems and water -flow
switches on all sprinkler systems shall be electrically monitored where the number of
sprinklers are: 1) 20 or more in Group I, Divisions 1.1 and 1.2 occupancies. 2) 100 or
more in all other occupancies.
CONCEALED SPACES: - Section 8.14.1
9. All concealed spaces enclosed wholly or partly by exposed combustible construction
shall be protected by sprinklers.
HANGERS:
10. The maximum distance between hangers shall not exceed that specified in Table 9 -2.2.
11. Exception: The maximum distance between hangers for listed nonmetallic pipe shall be
modified as specified in the individual product listings.
PIPING CLEARANCE: - Section 9.3.4
12. Where pipe passes through holes in platforms, foundations, walls, or floors, the holes
shall be sized such that the diameter of the holes is 2 in. (50 mm) larger than the pipe for
1 in. (25 mm) nominal to 31/2 in. (89 mm) nominal and 4 in. (100 mm) larger than the
pipe for pipe 4 in. (100 mm) nominal and larger. Clearance from structural members not
penetrated or used, collectively or independently, to support the piping shall be at least 2
in. (51 mm).
13. 9.3.4.3: Where clearance is provided by a pipe sleeve, a nominal diameter 2 in. (51 mm)
larger than the nominal diameter of the pipe is acceptable for pipe sizes 1 in. (25.4 mm)
through 31/2 in. (89 mm), and the clearance provided by a pipe sleeve of nominal
diameter 4 in. (102 mm) larger than the nominal diameter of the pipe is acceptable for
pipe sizes 4 in. (102 mm) and larger.
14. 9.3.4.4: No clearance is necessary for piping passing through gypsum board or equally
frangible construction that is not required to have a fire resistance rating.
15. 9.3.4.5: No clearance is necessary if flexible couplings are located within 1 ft (0.31 m) of
each side of a wall, floor, platform, or foundation.
SWAY BRACING: - Section 9.3.5 - 9.3.5.8
16. The system piping shall be braced to resist both lateral and longitudinal horizontal
seismic loads and to prevent vertical motion resulting from seismic loads. The structural
components to which bracing is attached shall be determined to be capable of carrying
the added applied seismic loads. Sway braces shall be designed to withstand forces in
tension and compression. Bracing shall be attached directly to feed and cross mains.
17. For feed and cross mains, longitudinal sway bracing shall be spaced a maximum of 80 ft.
Later -al sway bracing shall be spaced a maximum of 40 ft. A length of pipe shall not be
ti braced to sections of the building that will move differentially.
Restraint of Branch Lines. - Section 9.3.6
18. Restraint is considered a lesser degree of resisting loads than bracing and shall be
provided by use of one of the following:
a. A listed sway brace assembly
b. A wraparound U -hook satisfying the requirements of 6- 4.5.3, Exception Number
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c. No. 12, 440 -lb (200 -kg) wire installed at least 45 degrees from the vertical plane
and anchored on both sides of the pipe
d. Other approved means
19. Wire used for restraint shall be located within 2 ft (610 mm) of a hanger. The hanger
closest to a wire restraint shall be of a type that resists upward movement of a branch
line. The end sprinkler on a line shall be restrained against excessive vertical and
lateral movement. Where upward or lateral movement would result in an impact against
the building structure, equipment, or finish materials, branch lines shall be restrained at
intervals not exceeding 30 ft (9 m)
SPARE SPRINKLERS: - Section 6.2.9
20. The stock of spare sprinklers shall include all types and ratings installed and shall be as
follows:
a. For systems having less than 300 sprinklers, not fewer than six sprinklers
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b. For systems with 300 to 1000 sprinklers, not fewer than 12 sprinklers
c. For systems with over 1000 sprinklers, not fewer than 24 sprinklers
Approved Plans: 1 set of approved plans, bearing the City of Tigard approval stamp, shall be
maintained on the jobsite. The plans shall be available to the Building Division inspectors
throughout all phases of construction. 106.3.1 OSSC
When submitting revised drawings or additional information, please attach a copy of the
enclosed City of Tigard, Letter of Transmittal. The letter of transmittal assists the City of
Tigard in tracking and processing the documents.
Respectfully,
/,,,-' _--e-('
Val Henzel,
Senior Plans Examiner
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