Correspondence is
March 16, 2006 - --�
CITY OF TIGARD
.. _ OREGON
AFP System Inc.
Jim Bayne
19435 SW 129 Ave.
Tualatin, OR 97062
RE: FIRE SPRINKLER SYSTEM MODIFICATION - REVIEW
Project Information
Building Permit BUP2006 -10004 Construction Type: 1 B
Tenant Name: Aerotek Occupancy Type: B
Address: 9020 SW Washington Sq Occupant Load: 76
Area: 7,581 Sq Ft Hazard: Light
The plan review was performed under the State of Oregon Structural Specialty Code (OSSC) 2004
edition, Oregon Fire Code 2004 edition; and 2002 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.
162.L4: Modifications affecting 20 or fewer sprinklers shall not require testing in excess of system
working pressure.
WATERFLOWALARMS: - Section 6.9.1
2. 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.
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
T ,
SPRINKLER SYSTEM MONITORING: OSSC 901.6. - NFPA 13 sec 8.16
3. 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 more
than 20.
OBSTRUCTIONS /CLEARANCES: section 8.5.5 — 8.12
4. Continuous or noncontinuous obstructions less than or equal to 18 inches below the sprinkler
deflector that prevent the pattern from fully developing shall comply with 8.5.5.2.2.
5. Sprinklers shall be positioned in accordance with the minimum distances and special
requirements of sections 8.6 through 8.12 so that they are located sufficiently away from
obstructions such as truss webs and chords, pipes, columns, and fixtures.
PIPING CLEARANCE: - Section 9.3.4
6. 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).
7. 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.
HANGERS: section 9 -2
8. The maximum distance between hangers shall not exceed that specified in Table 9 -2.2.1
9. The maximum distance between hangers for listed nonmetallic pipe shall be modified as specified
in the individual product listings.
SWAY BRACING: - Section 9.3.5
10. 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.
11.For feed and cross mains, longitudinal sway bracing shall be spaced a maximum of 80 ft. lateral
sway bracing shall be spaced a maximum of 40 ft. A length of pipe shall not be braced to
sections of the building that will move differentially.
RESTRAINT OF BRANCH LINES: Section 9.3.6
12. Restraint is considered a lesser degree of resisting loads than bracing and shall be provided by
use of one of the following.
(1) A listed sway brace assembly
(2) A wraparound U -hook satisfying the requirements of 6- 4.5.3, Exception Number 3
(3) No.12, 440 -lb (200 -kg) wire installed at least 45 degrees from the vertical plane and
anchored on both sides of the pipe
(4) Other approved means
13. 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(9m)
SPARE SPRINKLERS: - Section 6.2.9
14. 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
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
Val Henzel,
Senior Plans Examiner