high rise fire protection 2013 - c&s · pdf filethe only effective means of fire control...
TRANSCRIPT
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High‐Rise Fire ProtectiongStandpipe and Sprinkler Systems
By:Douglas Nadeau, PE
PresidentRAN Fire Protection Engineering, PC
Tel: 518‐275‐0791Email: dnadeau@ranfpe comEmail: [email protected]
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IntroductionIntroduction
Why talk about high-rise buildings?y g g
Focus on the Building Code applicationg pp
Purpose of the presentation
My experience
Question
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First Interstate BankFirst Interstate Bank
62 Stories – process of62 Stories process of sprinkler retrofitStarted on 12th floorDelayed call to Fire DepartmentpSprinkler System disabledFire Pumps shut downpFire Damage – 12th-16th
1 Dead (Building Engineer)1 Dead (Building Engineer)
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AgendaAgenda
Overview of High-Rise Buildingsg g
Standpipe Systems
Sprinkler Systems
Water Supply
Design Issues
Key Points
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Overview of High‐Rise Buildings
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Building Occupancy CharacteristicsBuilding Occupancy Characteristics
ResidentialResidential
Commercial
Mixed occupancy
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Building Occupancy Characteristics dContinued
Residential buildings may contain senior citizens g yor people with special needs.
Residential buildings often have similar floor plans.
Commercial building floor plans often differ from floor to floorfloor to floor.
Building core usually remains consistentBuilding core usually remains consistent.
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High‐Rise Characteristic FeaturesHigh Rise Characteristic Features
Occupants above reach of rescue ladders.Occupants above reach of rescue ladders.
The only effective means of fire control is byThe only effective means of fire control is by internal attack.
A fire fighting team working from a riser are unlikely to control a fully involved 100 ft x 200 ft y yfloor area.
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High‐Rise Characteristic Features dContinued
Fire Department response times will be increasedFire Department response times will be increased in inner city areas.
High-rises are closed buildings – causing a rapid build up of heat and smoke.p
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High‐Rise Building Code SectionsHigh Rise Building Code Sections
Chapter 4 – Special Detailed Requirements p p qBased on Use and Occupancy
Sprinkler Protection §903 2 10 3 BuildingsSprinkler Protection - §903.2.10.3 Buildings over 30 feet in height.
Standpipe Protection - §905.3.1 Building height. Class III standpipe systems shall be installed throughout buildings where the floorinstalled throughout buildings where the floor level of the highest story is located more than 30 feet…
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High‐Rise Building Code provisions lapplies to
Buildings having occupied floors located more than 75 feet (22 860 mm) above the lowestthan 75 feet (22 860 mm) above the lowestlevel of fire department vehicle access
Some exceptions such as air traffic control towers.towers.
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High‐Rise Building CodehChapter 4
Standby and Emergency Power RequiredStandby and Emergency Power RequiredThere is a difference!
Standby required for fire pumps, fire command centercenter …
E i f li hti fi lEmergency is for egress lighting, fire alarm…
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Standpipe SystemsStandpipe Systems
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High‐Rise Standpipe SystemHigh Rise Standpipe System
Purpose – installed to provide d t t fl f h tadequate water flow for hose streams
used to extinguish the fire.
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High‐Rise Standpipe SystemHigh Rise Standpipe System
Design BasisDesign Basis
Building Code and Fire Code
NFPA 14
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High‐Rise Standpipe System ld dBuilding Code
Chapter 9 requires that standpipes be installed p q p pper NFPA 14
Required installationsClass III standpipe systems shall be installed throughout buildings where the floor level of thethroughout buildings where the floor level of the highest story is located more than 30 feet above the lowest level of the fire department vehicle access …
But wait there is an Exception
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High‐Rise Standpipe System dContinued
Building Code Exception!!!g pClass I standpipes are allowed in buildings equipped throughout with an automatic
i kl t i t ll d i d ithsprinkler system installed in accordance with §903.3.1.1 or §903.3.1.2.
Note throughout
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Types of High‐Rise Standpipe SystemsTypes of High Rise Standpipe Systems
Wet Automatic – most commonWet Automatic most common
Wet Manual parking garages <150 ftWet Manual – parking garages <150 ft
D A t ti bj t t f iDry Automatic - areas subject to freezing
Dry Manual - open parking garages
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High‐Rise Standpipe System NFPA 14 Overview
Standpipes located in required stairwell.Standpipes located in required stairwell.
At least 4” for Class IIIAt least 4 for Class III.
6” risers required for combined system 4” if full6 risers required for combined system – 4 if full sprinkler protection.
Determine hose valve locations – max travel distance have to be in compliancedistance have to be in compliance.
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High‐Rise Standpipe SystemNFPA 14 Overview
Class I StandpipeClass I Standpipe
100 psi at the outlet of the hydraulically most100 psi at the outlet of the hydraulically most remote 2½ in. hose connection
Generally 500 gpm at hydraulically most remote standpipe + 250 gpm for eachremote standpipe + 250 gpm for each additional (max 1250 gpm)
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High‐Rise Standpipe System NFPA 14 Overview
Class I StandpipeClass I StandpipeRemote standpipe 100 psi requirement
Generally all new buildings.Possible pressure problemPossible pressure problem.3 in. drain rise for PRV’s
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Sprinkler SystemsSprinkler Systems
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General Sprinkler FactsGeneral Sprinkler Facts
Usually 1 or 2 sprinklers will control a fire:Usually 1 or 2 sprinklers will control a fire:
85% of the time in a wet pipe system85% of the time in a wet pipe system.
67% f th ti i d i t67% of the time in a dry pipe system.
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Why Sprinkler System FailWhy Sprinkler System Fail
NFPA, June 2007
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High‐Rise Sprinkler SystemHigh Rise Sprinkler System
Purpose – installed to provide d t t t ti tadequate property protection to
control the fire.
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High‐Rise Sprinkler SystemHigh Rise Sprinkler System
Design BasisDesign Basis
Building Code and Fire Code
NFPA 13
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High‐Rise Sprinkler Systemld dBuilding Code Requirements
Section §403 2 Automatic sprinkler systemSection §403.2 Automatic sprinkler system.Buildings shall be equipped throughout with an automatic sprinkler system inwith an automatic sprinkler system in accordance with NFPA 13.
A secondary water supply where required.
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High‐Rise Sprinkler System ““equipped equipped h hh h ””throughoutthroughout””
§903.3.1.1 NFPA 13 sprinkler systems. -provisions of this code require that a building orprovisions of this code require that a building or portion thereof be equipped throughout …Important wording – why?Important wording why?Exempt locations – where water is badAlternate protection allowed?Alternate protection allowed?
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High‐Rise Sprinkler System lAlternative protection
Section §903 1 1 states alternateSection §903.1.1 states alternate protection is permitted in lieu of automatic sprinkler protection where:sprinkler protection where:
1. recognized by the applicable standard andand
2. Such installations shall be approved by the code enforcement official.the code enforcement official.
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High‐Rise Sprinkler System ld d hBuilding Code Chapter 9
Floor control valves need to be supervised atFloor control valves need to be supervised at point of connection to riser.
Rubbish chutes need to have sprinkler protection.protection.
NFPA 13D and NFPA 13R do NOT applyNFPA 13D and NFPA 13R do NOT apply.
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High‐Rise Sprinkler SystemNFPA 13 Overview
Floor control valves shall be supervised byFloor control valves shall be supervised by constantly attended signaling service
Additional alarm apparatusWaterflow device per floor for the sprinkler systemsp p yCentral station service is required if a constant
supervision by qualified personnel is not providedDistinct trouble signal to indicate impairment of the
sprinkler system
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Water SupplyWater Supply
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High‐Rise Water Supply hCharacteristics
Primary Water SupplyPrimary Water Supply
Secondary Water Supply
Fire Pump
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High‐Rise Secondary Water SupplyHigh Rise Secondary Water Supply
On-site water supplypp y
Equal to the hydraulically calculated sprinkler demand including the hose stream requirementdemand, including the hose stream requirement
In Seismic Design Category C, D, E or F areasIn Seismic Design Category C, D, E or F areas
Duration of not less than 30 minutes
Exception for existing buildings
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High‐Rise Fire PumpHigh Rise Fire Pump
Series and Parallel PumpsSeries and Parallel Pumps
Zoning - Pressure
Break Tanks
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Series and ParallelFire Pumps
Series Fire PumpsSeries Fire PumpsMeant to boost the pressure from a lower
zonezone.The design is dependent on both operating
Parallel Fire PumpsPrimary and secondaryMeant to boost flow volume
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High‐Rise ZoningHigh Rise Zoning
R id l BuildingResidual Pressure
Building Height (feet)
Zones Remarks
65 psi 200 1 max 175 psi rating100 psi 120 1p
65 psi 350 1 PRV’s required100 psi 270 1 q100 psi 270 1
65 psi 580 2 Design limit of 350 psi100 psi 500 2 of 350 psi100 psi 500 2
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Break TanksBreak Tanks
No NFPA standards for sizing break tanksNo NFPA standards for sizing break tanks
Generally the size for 3 to 5 minutes of full flowGenerally the size for 3 to 5 minutes of full flow
M it i f th t l l i d dMonitoring of the water level is recommended
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Design IssuesDesign Issues
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Design IssuesDesign Issues
What is the biggest issue?
PPressure
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Design IssuesDesign Issues
Standpipe system pressure limit is 350 psip p y p p
Generally (product specific, safety factor of 8)S h d l 10 t 300 iSchedule 10 maxes at 300 psiSchedule 40 minimum at 350 psiSchedule 80 minimum at 650 psiSchedule 80 minimum at 650 psi
Reduction to 65 psi may be allowed by the p y yAuthority Having Jurisdiction. Generally used for existing buildings.
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Design IssuesDesign Issues
When system pressure exceeds 175 psiWhen system pressure exceeds 175 psi there may be listing problems.
Sprinkler listing are limited to 175 psi l i l li tiunless a special listing.
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Design IssuesDesign Issues
Make sure that water supply will meet system pp y ydemand.
Combined Standpipe/Sprinkler systems required additional coordination between NFPA 13 and 14
Generally the standpipe will be the most demanding on the water supply NOT ALWAYSdemanding on the water supply. NOT ALWAYS THE CASE.
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Design IssuesDesign Issues
If building is existing need to watchIf building is existing need to watch out for applying current code sections di tl t th b ildidirectly to the building.
Due Diligence is required to identify the required level of protectionthe required level of protection.
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Design IssuesDesign Issues
Existing buildingExisting building
AddiAdding new preaction systems
Jockey pump y p psetting
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Design IssuesDesign IssuesExisting building and systems
Upgrading to meet current codecurrent code requirements.
Listing pressure tiratings
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Design IssuesDesign Issues
New Construction
Water Supply
Greatest DemandGreatest Demand
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Design IssuesDesign Issues
Existing buildingExisting building
G t R h bilit tiGut Rehabilitation
Preparing for the future tenant renovation.
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Design IssuesDesign Issues
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QuestionsQuestions
What is the most effective means of fire control in high-rise buildings?
What is the pressure requirement for the hydraulically most remote hose connection for a Class I standpipe system?Class I standpipe system?
What is one of the most critical design issues forWhat is one of the most critical design issues for high-rise building standpipe systems?
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Key Points To RememberKey Points To Remember
Analyze the Codey
Plan early – communicate with CEOy
Address existing buildings uniquely
Address exceptions
PRESSURE!
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Key Points To RememberKey Points To Remember
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High‐Rise Fire ProtectiongStandpipe and Sprinkler Systems
By:Douglas Nadeau, PE
PresidentRAN Fire Protection Engineering, PC
Tel: 518‐275‐0791Email: dnadeau@ranfpe comEmail: [email protected]