Correspondence (
May 23, 2006
CITY OF TIGARD
OREGON
Protemp Associates
Bruce Butner
9788 SE 17 Ave
Portland, OR 97222
RE: MECHANICAL SYSTEM MODIFICATIONS
Project Information
Building Permit MEC2006 -00162 Construction Type: 3B
Tenant Name: Bridgeport MRI Occupancy Type: B
Address: 15755 SW Sequoia Pkwy Occupant Load: 18
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
cfm. 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 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. 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
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
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
6. 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.
7. 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.
8. 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.
9. 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
•
10. Metallic Ducts shall be supported in accordance with Sheet Metal & Air Conditioning Contractors National
Association, Inc. (SMACNA) — Metal and Flexible. OMSC 603.4
11. Condensate from cooling coils or evaporators shall be collected and discharged to an approved plumbing
fixture or disposal area. 307.1 OMSC
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,
i
/ .
Val Henze], Senior
Plans Examiner