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SYSKA HENNESSY
* GROUP 330 N.Wabash Ave • Chicago, IL 60611 • 312.588.3560 • www.syska.com
Farmers - Hillsboro
6600 SW Hampton St
Tigard, OR
Mechanical, Electrical, Plumbing,
and Fire Protection Basis of Design
PREPARED FOR:
Farmers - HOK
BY:
Syska Hennessy Group, Inc.
PROJECT No:ZHK35000
DATE:
2017-07-06
CONSULT + ENGINEER + COMMISSION
41111,
SYSKA HENNESSY
GROUP 330 N.Wabash Ave • Chicago,IL 60611 • 312.588.3560 • www.syska.com •
PUBLICATION RECORD
Document Publication
Version Date Author Reviewed by Description
Jason Andejeski,
Release 1 06/12/2017 Andrew Krebs, Andrew Krebs Draft-Client Review
Danielle Schenkoske
Jason Andejeski,
Release 2 07/06/2017 Andrew Krebs, Andrew Krebs Final-Bid & Permit Submission
Danielle Schenkoske
CONSULT + ENGINEER + COMMISSION
TABLE OF CONTENTS
SYSKA HENNESSY
GROUP
I. INTRODUCTION AND EXECUTIVE SUMMARY 2
II. MECHANICAL SYSTEMS 4
III. ELECTRICAL SYSTEMS 10
IV. PLUMBING SYSTEMS 16
V. FIRE PROTECTION SYSTEMS 17
SYSKA HENNESSY GROUP
Re: Farmers Insurance-Hillsboro,OR July 6,2017
MEP/FP Basis of Design
Introduction and Executive Summary
A. General
1. Farmers Insurance, an American insurer group of automobiles, homes and small businesses
headquartered in Los Angeles, CA, is planning to develop office space at 6600 SW Hampton
Street in Tigard, OR.The project will consist of approximately 40,000 rentable square feet (+/-
3000) of corporate office space.
Preliminary space plans include private offices, large open office areas, conference rooms,
(2) large training rooms, a lounge, a gym, and a server room.
2. This Basis of Design Narrative documents mechanical, electrical, and plumbing/fire
protection engineering system design strategies and principles for the Farmers Insurance
office relocation.
3. Use of this report will assist in design coordination, planning, design development, cost
estimating, and building commissioning purposes.
B. Current Building Codes:
1. Titles 1-18 of the Tigard Municipal Code
2. 2014 Oregon Mechanical Specialty Code (OMSC)
*Based on 2012 International Mechanical Code (IMC) & International Fuel Gas Code (IFGC)
3. 2014 Oregon Electrical Specialty Code (OESC)
*Based on 2014 NFPA 70, National Electrical Code (NEC)
4. 2014 Oregon Energy Efficiency Specialty Code (OEESC)
*Based on 2009 International Energy Conservation Code (IECC)
5. 2014 Oregon Plumbing Specialty Code (OPSC)
*Based on the 2009 Uniform Plumbing Code
6. 2014 Oregon Fire Code (OFC)
7. We will not necessarily consider the above Local Building Codes a minimum;we will evaluate
the current industry best practices for the project.
C. Standards:
1. ANSI American National Standards Institute
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MEP/FP Basis of Design
2. UL Underwriters' Laboratories
3. ADA Americans with Disabilities Act
4. AGA American Gas Association
5. ASCI American Standard Code for Information Exchange
6. ASME American Society of Mechanical Engineers
7. ASHRAE American Society of Heating Refrigerating &Air Conditioning Engineers
a. 62.1 2010
b. 90.1 2010
8. ARI American Refrigeration Institute
9. ASTM American Society for Testing and Materials
10. EIA Electronic Industry Testing Standards
11. FM Factory Mutual
12. NFPA National Fire Protection Association
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MEP/FP Basis of Design
II. Mechanical Systems
A. Design Criteria
1. Climate
a. The HVAC systems' design will be based on:
Summer: 93°F DB, 68°F WB (coincident)
Winter: -23°F DB
2. Space Conditions
a. Summer: 75°F DB±2°F
Upper humidity levels will be controlled in
compliance with ASHRAE 55-2010 (approx.55%RH _
at 75°F) using the cooling coils to dehumidify.
b. Winter: 72°F DB±2°F
Lower humidity will not be controlled (i.e. no
humidification systems).
c. Electronic equipment rooms: controlled to maximum 78°F DB
3. Cooling Loads
a. Lighting: 1 watt per square foot
b. Equipment: 3.0 watt per square foot maximum
c. Supplemental Cooling: As needed and installed by tenant based on
equipment loading within the space served.
4. Ventilation Rates
a. Ventilation (outdoor air) to occupied areas shall be in accordance with ASHRAE and
the previously listed adopted Mechanical Codes.
5. Design Occupancy
a. 140 sq.ft. /person, or per seating plan
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MEP/FP Basis of Design
6. Acoustic Levels
a. General Office-NC 42
b. Spaces adjacent to mechanical rooms-NC 44
7. Mechanical Energy Compliance
a. Per the 2014 Edition of the Oregon Mechanical Specialty Code, a Compliance
Certificate shall be submitted prior to the Permit Drawing Review.
b. Outside air ventilation calculations,which indicate compliance with Oregon
Mechanical Specialty Code Table 403.3 for outside ventilation air rates shall be
completed and submit prior to the Permit Drawing Review.
c. Testing-Tests shall be made by the permit holder and observed by the code official
as per section 107.2 for the Oregon Mechanical Specialty Code.
8. Seismic Considerations
a. Project location is within Seismic Category Dl.Seismic anchorage shall be applied
to all required pieces of equipment located on the project site as dictated by
structural calculations by others.
B. Base Building Systems
1. The Heating Ventilation and Air Conditioning (HVAC) system is provided by nine (9) Carrier
Weathermaster constant volume packaged rooftop units.The units are curb mounted, Gas
Heat/Electric Cooling units with downflow discharge and return openings.There are two (2)
4-ton, one (1) 8.5-ton, and six (6) 12.5-ton packaged rooftop units currently located on the
roof.As-built documentation show an additional 6-ton rooftop unit that was never installed,
but gas piping was routed to the location for future use.
2. The following information was observed regarding the existing air handling systems:
a. Medium pressure duct mains exist and route horizontally from each unit after ducted
tee fitting.The existing ductwork main elevation varies between 11'-6" and 12'-5"
above finished floor throughout the building.
b. Each packaged rooftop unit provides ventilation and cooling with a design primary
air temperature of 55 degrees F+/-2 degrees.Supply capacity from the existing 4-
ton, 8.5-ton, and 12-ton packaged rooftop units will vary between 1200-2000, 2550-
4250, and 3750-6250 CFM, respectively, for cooling conditions. During heating
conditions, the three unit types will provide a maximum up to 2460,4560,and 6750
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MEP/FP Basis of Design
CFM for each respective unit type.To accommodate higher than ideal design
temperatures, supplemental cooling units will be installed in high heating load areas
such as training rooms and MDF rooms.
c. The Tenant is responsible for extending ductwork from the packaged rooftop units to
serve multiple zones. The installation shall utilize rigid ductwork only within exposed
areas. Flexible ductwork connections may be used in areas with ACT drop ceilings,
and shall be limited to 5 feet in length. Ductwork shall be sized to limit the velocity to
2000 fpm for main trunks and 1500 fpm for branches.
d. The open ceiling space is utilized for the return air path. Modification to the space
conducted under this project shall maintain continuous return air path to the return
duct stub outs at the roof return penetrations shown on the drawings.Special
attention should be paid to the location of any walls to structure.Transfer grilles/
openings will be required at such locations and sized for maximum 500 fpm and shall
be provided with no less than one lined elbow.
e. Outside air shall be supplied to the building spaces as a percentage of supply air
that meets minimum OA criteria throughout the year. During shoulder seasons, each
RTU economizer shall be engaged to maximize free cooling to minimize energy
consumption, and maximize outside air delivery.
3. The existing Rooftop Unit distribution is currently unbalanced with 83 of the provided 91.5 tons
of cooling is currently located on the northern half of the space.This is due to two proposed
RTUs not being installed for future loading considerations. Per this scope of work, it is
recommended that at least one 8.5-ton RTU is installed new to supplement the southern half
of the building to provide required heating and cooling.This unit will also assist in providing
additional control to the south portion of the building.
a. A new roof penetration, curb,structural support, and gas piping infrastructure would
need to installed to support this installation. Currently, a capped gas piping riser is
located within proximity due to the originally intent to install additional RTUs in the
south portion of the building.
4. Toilet exhaust fans shall provide exhaust for all toilet rooms. Rooms are exhausted at 70
CFM/fixture if run intermittently. Continuous operation of the toilet exhaust fans allows for
CFM to reduce to 50 CFM/fixture and may be provided as an alternate depending on
building usage and schedule.Shower rooms shall be exhaust at 40 CFM/shower head.
5. Supplemental heating is to be provided through the installation of electric baseboard
heating units at the perimeter and sized to account for heat loss through the building
exterior. Only the ground level spaces will be supplied with baseboard heating. Baseboard
heat shall be controlled via stand-alone thermostat.
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MEP/FP Basis of Design
6. There are no provisions for condenser or chilled water cooling at the project site due to the
lack of infrastructure.
C. Air Systems
1. All new medium pressure ductwork shall be constructed per 1995 SMACNA standards for 2"
pressure class,seal Class A. All new medium pressure ductwork shall be lined with 1" thick 1.5
PCF flexible fiberglass duct for the first 15 feet of duct from the rooftop unit. External
insulation is not required.
2. All zones shall be conditioned via the constant volume rooftop units. In instances where
adjacent spaces with varied loading schedules have conflicting air supply requirements,
variable air volume diffusers shall be installed with local zone thermostats. Each unit shall be
provided with a bypass ring to ensure CFM flow.
a. Interior and perimeter zones shall be zoned separately.
b. All conference rooms shall be zoned independently.
c. No more than three offices on one zone.
d. A single zone shall not exceed 1000 square feet.
e. Filters shall be provided for units operating during construction. Landlord duct
openings shall be protected with filter media during construction.
f. Toilet rooms will be conditioned by the nearest packaged rooftop unit.
3. Open office areas shall be supplied via duct mounted round diffusers with downflow center
sections and radial throw pattern.Zones with ACT ceiling types will be provided with panel
face supply type diffusers to supply air to the space.
4. Minimum air supply volume to interior zones shall be 0.70 CFM per square foot.
5. Round duct and round diffusers shall be provided in the open ceiling areas.
6. All test and balance shall be completed by the building approved test and balance
contractor.All reports shall adhere to the industry standard.
7. As an add-alternate, conversion of the existing constant volume supply air system to a
Variable Volume and Temperature (VVT) can occur by adding pressure dependent VVT
zone controllers, a bypass controller per RTU, and the required sensors per zone.
D. Supplemental Cooling Equipment
r
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MEP/FP Basis of Design
1. Training Room Rooms 144 and 145
a. Supplemental cooling for each training room shall be provided by ceiling mounted
units with ducted supply and return distribution. Units are to be provided with drain
pans utilizing leak detection and condensate pumps.Sizing of the units shall handle
all additional equipment and occupancy loading within their respective spaces.This
includes, but will not be limited to:computer and server hardware, a/v equipment,
and any other potential loading. Based on the known occupancy, 3-tons of DX
supplemental cooling will be provided within each Training Room.An air-cooled
condenser shall be installed upon the roof with refrigerant lines routed along the
nearest structural column.
b. Condensate drainage of each supplemental unit will be routed to the nearest floor
drain with turndown discharge via air gap above open site drain.
2. MDF 113 Supplemental Cooling
a. Supplemental cooling for the MDF room shall be provided via a ceiling mounted unit
with ducted supply and return distribution. Unit is to be provided with a drain pan
utilizing leak detection and a condensate pump.Sizing of the unit shall handle all
additional electrical equipment.This includes all server racks and other possible
devices. Based on expected loading calculations, a 3-ton DX supplemental cooling
will be provided within the MDF Room.An air-cooled condenser shall be installed
upon the roof with refrigerant lines routed along the nearest structural column.
b. Condensate drainage of each supplemental unit will be routed to the nearest floor
drain located within the adjacent Janitor's Closet with turndown discharge via air
gap above open site drain.
3. IDF 105 and Pantry Area Exhaust Fans
a. The IDF Room shall be thermostatically controlled and tied into an overhead exhaust
fan.The exhaust discharge shall route away from occupied spaces, but towards the
nearest RTU return ductwork.
b. The Pantry area within Lounge 103 shall be controlled via a wall mounted switch to
exhaust heat and odors from the area in the same manner as the IDF exhaust fan.
Discharge shall be directed towards the nearest RTU return duct.
E. Building Controls
1. All building controls shall be handled by each units' respective RTU stand-alone thermostat •
with exception to the smaller enclosed spaces with ACT ceilings.Those spaces shall be
•
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MEP/FP Basis of Design
served by the previously mentioned VAV diffuser system with rated cable connections tied
into a local zone thermostat.
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MEP/FP Basis of Design
Ill. Electrical Systems
A. Applicable Codes and Standards
1. 2014 Oregon Electrical Specialty Code (OESC)
2. ADA-Americans with Disabilities Act
3. ANSI-American National Standards Institute
4. EPACT-Energy Policy Act of 2005
5. ETL-Electrical Testing Laboratories
6. FM-Factory Mutual
7. IESNA-Illuminating Engineering Society of North America
8. IEEE-Institute of Electrical and Electronics Engineers
9. NEMA-National Electrical Manufacturers Association
10. NFPA-National Fire Protection Association
11. NFPA 101 Life Safety Code
12. OSHA Occupational Safety and Health Act
13. UL-Underwriters' Laboratories
14. 2014 Oregon Energy Efficiency Specialty Code (OEESC)
B. Normal Power Distribution System
1. The building facility has an existing electrical service consisting of one (1) 3000 amp, 208/120
volt, 3-phase,4-wire distribution panel. This distribution board has a line side feeder
extended to the utility company transformer. This distribution board has a 1200 amp bolted
pressure switch that feeds a 2000 amp, 208/120 volt,3-phase,4-wire distribution panel. This
distribution panel currently feeds (4) 208/120 volt, 3-phase, 4-wire branch panels.These
panels serve receptacle, lighting, mechanical and miscellaneous loads throughout the
facility.Additional branch panels will be added to spare fused switches in the distribution
board to meet the current design.There is adequate space in the electrical room to
accommodate these additional branch panels.
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MEP/FP Basis of Design
2. Most tenant distribution and branch circuit panels shall be located in the existing (2)
electrical rooms.Two panels will be located in Storage Room 104 to minimize branch circuit
length and voltage drop.
3. All new electrical equipment shall be manufactured by Square D,Siemens, Eaton, or
General Electric.
C. Life Safety Emergency Services
1. Legally required Life Safety power will be provided to new emergency lights and exit signs
via a new lighting inverter.This lighting inverter will be located in Ex. Elec Room 122. It will
serve new:
a. Exit signs and light fixture designated for life safety path of egress illumination.
2. An existing fire alarm panel with battery back-up is located in a closet at the southeast
entrance of the building. It is a Model 5207 Fire Control/Communicator by Silent Knight. It will
serve new:
a. Fire Alarm devices.
b. Security door hardware within the life safety of egress.
D. Un-interruptible Power Source (UPS)
1. Farmers Insurance will need to provide an MDF and IDF layout indicating receptacle
quantity and type for each of these rooms, as well as UPS type and total load.The basis of
design currently anticipates a rack mounted UPS.
E. Raceways,Support, and Conductors
1. Galvanized steel raceway for wiring including power, fire alarm, communications, and
special systems. Fire alarm shall be installed in red conduit for ready identification.
2. EMT with compression or setscrew fittings for branch circuits, minimum 3/4 inch.
3. HWG with threaded fittings for wiring at exterior locations
4. Galvanized steel supports and concrete equipment bases
5. Copper THHN/THWN for general distribution feeders and ground conductors
6. Copper THHN/THWN for general purpose and motor branch circuits, and ground conductors.
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MEP/FP Basis of Design
7. All wiring and conduit in open ceilings will be in EMT conduit and run parallel/perpendicular
to ceiling trusses and painted to match existing gray ceiling.
F. Receptacles and Communication Devices
1. Commercial grade 20 amp receptacles within building and common areas.
2. Devices within a common wall shall be offset, not back-to-back to reduce noise transfer.
3. NEMA special receptacles will be installed as required.
4. Raceway, back boxes, and power for communications systems.
5. All wiring for open office furniture feeds shall be trenched to the furniture.Alternate: Utilize
existing walker duct system if possible. Open office furniture is pre-wired.
G. Lighting
1. Luminaires and lighting systems shall provide maintained, average illumination levels that
meet the recommendations of the Illumination Engineering Society of North America (IESNA).
Light fixture selection and layout will be provided under the Architectural design scope of
work.
a. Lamps: Low-Mercury Lamps: Comply with EPA's toxicity characteristic leaching
procedure test;shall yield less than 0.2 mg of mercury per liter when tested
according to NEMA LL 1.
b. LED modules, chips and boards: CRI 80 (minimum), color temperature 3500K in
back-of-house areas and 3500K for public spaces, average rated life of 50,000 hours
at 70 percent lumen maintenance when operated at 3 hours per start, unless
otherwise indicated. Illumination performance of LED modules, chips and boards
shall be verified by IESNA LM-79 procedures.
c. Electronic T5 lamp Ballasts: Comply with ANSI C82.11; programmed or rapid start
type,and designed for type and quantity of lamps served. Ballasts shall be
designed for full light output at a power factor of 0.98 or higher. Total Harmonic
Distortion Rating of less than 10 percent with a ballast factor of 0.85 or higher
d. Electronic Programmed-Start Ballasts for T5 and T5HO Lamps: Comply with
ANSI C82.1 1. Shall have lamp end-of-life detection and shutdown circuit for T5
diameter lamps,Total Harmonic Distortion Rating of less than 10 percent with a
ballast factor of 0.95 or higher. Ballasts shall be designed for full light output at a
power factor of 0.98 or higher
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Re: Farmers Insurance-Hillsboro,OR July 6, 2017
MEP/FP Basis of Design
2. Exit signs.
a. Exit signs shall be located along the path of egress and at building exits. Internally
illuminated exit signs will be provided that comply with UL 924; for sign colors,visibility,
luminance, and lettering size.
1) Edge-lit, clear acrylic signs with red LED light source and mirrored
background, 70,000 hours minimum rated lamp life. Battery backup life
safety power will be provided by connection to the facility lighting inverter.
H. Lighting Control Systems.
1. Building lighting controls meeting OEESC 2014 requirements will consist of a central time
clock system with automatic time controls to regulate the on-off cycles of public space
interior lighting circuits. The system shall be manufactured by Lutron, Leviton or n-Light. The
system will include inputs from daylight sensing devices and vacancy sensors only where
required for maximum energy savings. Individual areas will also have low-voltage over-ride
controls and dimming where required.
a. Individual offices, conference rooms, restrooms, and storage/IT spaces shall also
have localized occupancy/vacancy sensor controls to suit the specific space
functions. Occupancy/vacancy sensors shall be wall or ceiling mounted (to suit
installation) dual technology digital (passive infrared and ultrasonic) type sensor
which accommodates the square-foot coverage requirements for each area
controlled.
b. All conference rooms, training rooms, and boardrooms will get dimmable lighting.
c. Mechanical and electrical rooms shall use digital switches with automatic timer
override for lighting control.
d. Day-lighting control of lighting systems at the open office and areas located
adjacent to side-lit and beneath sky-lit areas will be pursued to meet Energy Code
requirements. Photo-sensors will only be located in these areas to reduce electrical
lighting load when there is sufficient daylight available.
Fire Alarm and Life Safety System
1. The facility's existing Silent Knight addressable multiplex initiation and hard-wired notification,
electronically operated, UL listed, main control panel, providing initiation, notification,will be
utilized.
2. The Building's fire alarm subcontractor shall be utilized for all terminations of the fire alarm
devices at the Landlord's Base Building fire alarm panel.
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MEP/FP Basis of Design
3. ADA strobes, horns, and horn/strobes will be installed within public spaces including base
building and common areas, lobbies and corridors.
4. Smoke detectors within electrical and telecommunications rooms.
5. Remote indication lights adjacent to door for devices located within electrical,
telecommunication rooms.
6. Remote test stations and indication lights for each duct smoke detector.
7. Connections to electric door lock releases.
8. Connections to, tamper switches,water flow and air pressure switches.
J. Motor Starting
1. Motors less than 1/2 horsepower via adjustable speed drives or solid state reduced voltage
motor starters at 120 Volt, 1 phase.
K. Equipment Connections Coordinated with other Trades,Architect, and Owner
1. Electrical connections,wiring, controls, starters, disconnect switches,raceway, overcurrent
protection, and required installation.
2. Roof-top Units.
3. Baseboard heating.
4. HVAC pumps,fans,fan coil units,VAV boxes and other equipment.
5. Supplemental Cooling Units.
6. Electric Water Heaters.
7. Specialized pantry equipment
L. Identification
1. Equipment labeling on distribution panels, feeder breaker, panelboard, controller, etc.shall
contain three levels of information:
a. From: Noting where the equipment is fed from
b. Name:The name of the equipment
c. To: Noting what the equipment feeds/serves
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MEP/FP Basis of Design
2. Plastic laminate nameplates for electrical distribution equipment.
3. Painted markers for conduit and boxes.
4. Typewritten panel board directories.
5. Engraved device nameplates for special outlets
6. Adhesive circuit labels to be provided at receptacles fed from the UPS.
M. Additional Schematic Design Criteria for Specific Areas
1. Corridors:
a. Receptacles-50'o.c.
2. Storage:
a. Receptacles-one per 750 sf
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MEP/FP Basis of Design
IV. Plumbing Systems
A. Plumbing system for the project will be designed in accordance with 2014 Oregon Plumbing
Specialty Code based on the 2009 Uniform Plumbing Code.
B. Provide new central, electric, storage-type water heaters to serve showers,restroom lavatories, mop
receptor, mother's room sink, and pantry sink.
C. Provide sinks and faucets for new pantries and mother's room.
D. Provide electronic trap primer for all new floor drains in pantry and open hub drains (where
applicable).
E. Provide 2" dedicated p-traps for pantry dishwasher connections.
F. Provide all plumbing connections (waste,vent, HW and CW) to all new pantry equipment.
G. Each water connection to pantry equipment shall be provided with shut-off valve, dual check valve
and mini water hammer arrestor.
H. Provide thermostatic mixing valves to all sink and lavatory faucets.
Provide ADA cushions to all sink and lavatory supplies and p-traps.
J. Provide pressure balance valves for all showers.
K. All pipes serving new plumbing fixtures shall be extended and connected to existing sanitary and
vent and cold water piping.
L. Existing slab to be trenched to install all new underground piping, then patched to match existing
slab after piping is installed. The existing slab shall be x-rayed prior to any trenching.
M. All domestic water piping shall be insulated horizontally and vertically inside walls.
N. Provide open hub drains as required for mechanical and fire protection systems.
O. Provide full port shut-off valves (ball valve type) on cold water piping to each room.
P. Any above ceiling piping or equipment that requires maintenance (cleanouts, valves,etc.) will have
an access panel to serve these elements.
Q. Americans with Disabilities Act applies to all areas where plumbing fixtures are required to be
accessible.
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MEP/FP Basis of Design
V. Fire Protection Systems
A. Fire protection system for the project will be designed in accordance with NFPA and the 2014
Oregon Fire Code.
B. Disconnect and remove existing sprinkler heads from new created concealed ceiling spaces and
cap branch piping and arm overs at source.
C. Provide pendent type, concealed sprinkler heads in the finished ceiling areas. The finish for the
sprinkler head cover is to be coordinated with the architect
D. Provide upright sprinkler heads in the open to deck structure areas including spaces above
cloud/floating ceiling.
E. Only new sprinklers shall be installed and shall match existing sprinkler heads.
F. In the open to deck structure areas additional sprinkler heads shall be provided above and below
ductwork, conduit and equipment greater than 4'-0" in width.
G. Sprinklers shall be installed above and below any floating type ceiling that is not provided with a
drywall enclosure to separate the ceiling space from the open area.
H. Schedule 40 black steel pipe shall be provided for piping 2" and smaller.
Use of Schedule 5 pipe is not permitted for the sprinkler piping.
J. All new materials and equipment (pipes, fittings, etc.) shall be domestically made (made in USA).
K. Provide new fire extinguisher cabinets/fire extinguishers as necessary for proper coverage. Cabinet
type and finishes to be coordinated with the architect.
L. Provide signage above all fire extinguisher cabinets and all combination fire department valve/fire
extinguisher cabinets.
M. Fire sprinkler system for project shall be a wet pipe sprinkler system and designed to Oregon Fire
Code and NFPA 13 standards.
1. Fire sprinkler head layouts, hydraulic calculations, and flow rates shall be subject to review
and approval of the building insurance company approvals process.
2. Mechanical spaces will be Ordinary Hazard I with a density of 0.15 gallons per minute per
square foot over 1,500 square feet.
3. Storage spaces will be Ordinary Hazard II with a density of 0.20 gallons per minute per square
foot over 1,500 square feet.
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Re: Farmers Insurance-Hillsboro, OR July 6, 2017
MEP/FP Basis of Design
4. All public and back of house spaces will be Light Hazard with a density of 0.10 gallons per
minute per square foot over 1,500 square feet.
5. Maximum sprinkler head spacing shall be limited to 225 square feet for Light Hazard, and 130
square feet for Ordinary Hazard.
6. Hydraulic calculations are required on pressure available at point of connection to on-site
water supply.
a
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