Correspondence A //�rau�
April 26, 2005 ��' �4'�
CITY OF TIGARD
Evergreen Engineering, LLC OREGON
Steve Cruft
20827 NW Cornell Rd #200
Hillsboro, OR 97124
RE: MECHANICAL SYSTEM MODIFICATIONS — HEMCON MFG
Project Information
Building Permit MEC2006 -10052 Construction Type: VB
Tenant Name: Hemcon Occupancy Type: F - 2
Address: 10575 SW Cascade Ave Occupant Load: 114
Stories: 1
The plan review was performed under the State of Oregon Mechanical Specialty Code (OMSC) 2004
edition. The submitted plans are approved subject to the following.
1. Equipment and appliances shall be installed as required by the terms of their approval, in
accordance with the conditions of the listing, the manufacturer's installation instructions and this
code. Manufacturer's installation instructions shall be available on the job site at the time of
inspection. OMSC 304.1
2. The building or structure shall not be weakened by the installation of mechanical systems. Where
floors, walls, ceilings or any other portion of the building or structure are required to be altered or
replaced in the process of installing or repairing any system, the building or structure shall be left
in a safe structural condition in accordance with the Building Code. The cutting, notching and
boring of framing members shall comply with OMSC 302 Sections 302.3.1 through 302.5.3.
3. Smoke detectors shall be installed in return air systems with a design capacity greater than 2000
cfin. Upon activation, the smoke detector shall shut down the air distribution system. Smoke
detectors shall be connected to a fire alarm system and shall activate an audible and visible alarm at
a constantly attended location. OR In occupancies not required to be equipped with a fire alarm
I system, actuation of a smoke detector shall activate a visible and an audible signal in an approved
location. OMSC 606.
4. Equipment and appliances regulated by this code requiring electrical connections shall have a positive
means of disconnect in accordance with the Electrical Code. OMSC 301.7
5. NOTE: Boilers and pressure vessels and related piping are regulated by the state of Oregon Boiler
and Pressure Vessel Law (ORS 480.510 to 480.670). OMSC 1017.1 General. Steam piping is regulated
according to and under the jurisdiction of the Oregon Boiler and Pressure Vessel Law and related
dministrative rules and the jurisdiction of Oregon Building Codes Division, Boiler and Pressure Vessel
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
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Program. Water piping for hot -water heating systems and hydronics shall be installed according to
OMSC Chapter 12.
6. Hydronic piping systems shall be designed and installed to permit the system to be drained. Where the
system drains to the plumbing drainage system, the installation shall conform to the requirements of
the Plumbing Code. OMSC 1206
7. Hydronic piping systems other than ground source heat pump loop systems shall be tested
hydrostatically at one and one half times the maximum system design pressure, but not less than 100
psi (689 kPa). The duration of each test shall be not less than 15 minutes. OMSC 1208
8. Every refrigerant - containing part of every system that is erected on the premises, except compressors,
condensers, vessels, evaporators, safety devices, pressure gauges and control mechanisms that are listed
and factory tested, shall be tested and proved tight after complete installation, and before operation.
Tests shall include both the high- and low- pressure sides of each system at not less than the lower of
the design pressures or the setting of the pressure relief device(s). The design pressures for testing shall
be those listed on the condensing unit, compressor or compressor unit name - plate, as required by
ASHRAE 15. OMSC 1108
9. A person engaged in the brazing or welding of refrigeration piping shall have a valid certification
meeting the requirements in OAR 918 - 440 -0015. For refrigeration piping regulated by the State of
Oregon Boiler and Pressure Vessel Program, see requirements listed in OAR 918 - 225 -0310. All
three of these administrative rules were effective July 1, 2001.
10. OAR 918 -225 -0310 Refrigerant Piping Systems; Components (1) The requirements of OAR
918- 225-0430(5) shall be enforced under this rule for all refrigerant piping systems consisting of
welded, brazed or mechanically assembled piping and piping fittings exceeding 2 inches NPS, and
containing any refrigerant chemical rated as other than A -1 or B-1 by the American Society of
Heating, Refrigeration and Air Conditioning Engineers (ASHRAE 34) as adopted by the Oregon
Mechanical Specialty Code.
11. 918-440 -0015 Refrigeration Installer Certification All persons engaged in brazing or welding
related to the installation, alteration or repair of refrigeration piping systems not regulated by the
Oregon Boiler and Pressure Vessel Program under OAR Chapter 918, Division 225, shall be
certified in accordance with the requirements of this rule.
12. Gas piping systems under 14 inches water column pressure, shall be tested at a pressure of not less
than 10 pounds per square inch gage. Test pressures shall be held for not less than 15 minutes with
no perceptible drop in pressure. For welded piping, and for piping carrying gas at pressures exceeding
14 inches water column (3484 Pa) pressure, the test pressure shall be at least 60 pounds per square
inch for not less than 30 minutes. C406.4.1
13. Fire and smoke dampers shall be provided with an approved means of access, large enough to permit
inspection and maintenance of the damper and its operating parts. The access shall not affect the
integrity of fire- resistance -rated assemblies. The access openings shall not reduce the fire- resistance
rating of the assembly. Access points shall be permanently identified on the exterior by a label having
letters not less than 0.5 inch in height reading. SMOKE DAMPER or FIRE DAMPER. OMSC 607.4
14. Ducts shall be supported with approved hangers at intervals not exceeding 10 feet or by other
approved duct support systems designed in accordance with the Building Code. Flexible and other
factory -made ducts shall be supported in accordance with the manufacturer's installation instructions.
OMSC 603.10
15. Metallic Ducts shall be supported in accordance with Sheet Metal & Air Conditioning Contractors
National Association, Inc. (SMACNA) — Metal and Flexible. OMSC 603.4
16. Appliances shall be accessible for inspection, service, repair or replacement without removal of
permanent construction. 306.1 OMSC
17. Condensate from cooling coils or evaporators shall be collected and discharged to an approved
plumbing fixture or disposal area. 307.1 OMSC
18. Guards shall be provided where appliances are located within 10 feet of the roof edge or open side
of a walking surface and such edge or open side is located more than 30 inches above the floor, roof or
grade below. The guard shall be 42 inches above the elevated surface with an intermediate rail so as
not to allow the passage of a sphere, 21 inches in diameter. 304.9
Mercury Thermostats. The State of Oregon prohibits the installation of thermostats that contain
mercury in commercial and residential buildings. "In accordance with ORS 455.355, the disposal of
thermostats that contain mercury shall be in accordance with programs established by thermostat
manufacturers, their representative or distributor, or by delivery to sites that will ensure that the
mercury does not become part of the solid waste stream or wastewater."
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, z.
al Henzel,
Senior Plans Examiner