título · 2020. 3. 11. · title: título author: gonçalo sítima created date: 11/5/2016 3:34:46...
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New Sprinkler Protection Technologies for High Bay Storage -
The Next Generation of In-Rack Sprinklers
Sultan M. Javeri European Regional Director NFPA
1
LOGO
2LOGO ORADOR
30 years ago, we started trying to eliminate in-rack sprinklers…
1975 2000 2025
are they coming back?
Ceiling-Only Protection Schemes
• The pursuit of increasing building heights with ceiling-only protection schemes has resulted in the following:
• Creation of larger K-Factor storage sprinklers
• Increased hydraulic sprinkler system demand
Minimum Water Demand of Ceiling-Only NFPA 13 Criteria for Cartoned Unexpanded Plastics
Today, construction of higher storage occupancy buildings are possible using technologies likeAutomated Storage and Retrieval Systems (ASRS)
Automated Storage Retrieval System
• High bay warehouses are rack supported structures
• Utilize Automated Storage Retrieval System (ASRS) for commodity handling
• Heights can be in excess of 40m
• Ceiling only sprinkler protection is not an option
• Precision of ASRS allows for use of in-rack sprinklers without fear of inadvertent activation
Ceiling-Only Protection Limitations
• Ceiling-only sprinkler protection up to 14.65m Carton Unexpanded Group A plastics
– Specific Application UL Listing
• More hazardous commodities present an increased challenge to a sprinkler system
– Tires
– Exposed Group A plastics
– Aerosols
– Combustible Liquids
– Flammable Liquids
• Typically require in-rack sprinklers to be provided at lower storage heights
NFPA 13 (2016) Exposed Expanded Group A Plastics
• ESFR protection for Exposed Expanded Group A Plastics with vertical barriers spaced at 5m and 2.4m minimum aisle width
Rack storage of Exposed Expanded Group A PlasticsESFR Protection
MAX. Building Height 12.2m
Storage Height 10.6m
Sprinkler Type K360 ESFR
No. of Heads 12
Pressure 4.1 bar
Sprinkler Demand 8,869 lpm
Hose Demand 946 lpm
Total Demand 9815 lpm
NFPA 13 (2016) Exposed Expanded Group A Plastics
Residual damage with protection system going into NFPA 13 edition
2016
NFPA 13 (2016) Rubber Tire Storage
• NFPA 13 allows ceiling-only protection up to 30’ for rubber tyre storage on racks
Rack storage of Rubber Tyres on Portable RacksESFR Protection
MAX. Building Height 12.2m
Storage Height 9.1m
Sprinkler Type K360 ESFR
No. of Heads 12
Pressure 5.2 bar
Sprinkler Demand 9,910 lpm
Hose Demand 946 lpm
Total Demand 10,856 lpm
NFPA 30 (2015) Combustible Liquids
• NFPA 30 has no criteria for ceiling only protection of Class II Combustible Liquids in 200 litres metal drums stored in racks
Rack Storage of Class II CombustibleLiquids in 55 Gallon Metal DrumnsESFR Protection Design Criterion
Max. Building Height ???
Storage Height ???
Sprinkler Type ???
No. of Heads ???
Pressure ???
Sprinkler Demand ???
Hose Demand ???
Total Demand ???
Why are in-rack sprinklers a better
option?
• Sprinklers located closer to a rack storage fire is an advantage
• Sprinklers have the potential to activate when a fire is smaller and requires less water to control
• Building geometry does not affect sprinkler protection in two key areas:
– Building height
– Roof slopes greater than 2 in 12
• Obstruction rules for ceiling sprinklers do not apply to in-rack sprinklers
• In-rack sprinklers are intended specifically for areas that have obstructions
New In-Rack Protection Option in NFPA 13 2016 ed.
• Design criteria for in-rack sprinklers minimum K-115 quick-response
• Horizontal barriers installed at a maximum vertical interval of 3.6m and are constructed from:
– 12mm plywood
– 22 gauge metal
• Protection for these hazards:
– Group A Plastics
• Expanded
• Unexpanded
• Cartoned
• Exposed
– Class I through IV Commodity
• Similar to Scheme 8-9A from FM Global Data Sheet 8-9
New In-Rack Protection Option in NFPA 13 2016 ed.
= Horizontal Barrier= Longitudinal Flue Space Sprinklers= Face Sprinklers
`
Plan View
Elevation View26 In-Rack Sprinklers!
New In-Rack Protection Option in NFPA 13 2016 ed.
• The new in-rack design criterion has two significant drawbacks:
– The installation can be costly due to the number of in-rack sprinklers and the amount of piping required
– For double and multiple-row racks, in-rack sprinklers are located between each pallet load at the face of the aisle where they can be vulnerable to damage
• These two concerns are common with conventional in-rack sprinkler technology, as well as new NFPA 13 2016 Edition
The next generation of in-rack sprinklers offers substantial improvement in both areas…
Introducing N-Rack-EC®
» Performance based in-rack sprinkler design criteria
» Design criteria validated through a series of large scale fire tests
» Extended coverage, both horizontally and vertically
» Featuring Reliable N252 EC (SIN RA0842) Pendent Extended Coverage Storage Sprinkler
» Flat spray pattern
» 25.2 K-factor provides high flow rate at low pressure
» Patent Pending
N-Rack-EC® Spray Pattern Using Reliable N252 EC
522 lpm per flowing N-Rack-EC ® sprinkler!
Large Scale Test Series Summary
5-Nov-1617.
Test 1 Test 2 Test 4 Test 5 Test 6 Test 7 Test 8
Double Row Rack
Double Row Rack
Double Row Rack
Double Row Rack
Double Row Rack
Multi Row Rack
Double Row Rack
Exposed Expanded Plastic
CartonedUnexpanded Plastic
CartonedUnexpanded Plastic
CartonedUnexpanded Plastic
Class II Combustible Liquid
Exposed Expanded Plastic
CartonedUnexpanded Plastic
8’ Aisle 8’ Aisle 4’ Aisle 4’ Aisle 6’ Aisle 4’ Aisle 4’ Aisle
Horizontal Barriers at 20 ft. Elev.
Horizontal Barriers at 30 ft. Elev.
Continuous Horizontal Barriers at 20 ft. Elev. & 40 ft. Elev.
ContinuousHorizontal Barriers at 30 ft. Elev.
ContinuousHorizontal Barriers at 15 ft. Elev. & 30 ft. Elev.
Continuous Horizontal Barriers at 20 ft. Elev.
ContinuousHorizontal Barriers at 30 ft. Elev.
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1618.
Test Parameters
Storage Type Double Row Rack
Commodity Type Exposed Expanded Group A Plastic
Pallet Type 2 Way Entry, Stringer, Hardwood
Horizontal Barrier Within Rack
3/8 inch Plywood at 20 ft. Elevation
Storage Height 35 ft.
Ceiling Height 40 ft.
Clearance 5 ft.
Aisle Width 8 ft.
Ignition Location Between 2 Ceiling and In Rack Sprinklers (Face of Commodity in Aisle Space)
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1619.
Ceiling Sprinkler System
Sprinkler Type K=16.8 ESFR Pendent
Deflector to Ceiling 14 in.
Ceiling Sprinkler Spacing
10 ft. x 10 ft.
Temperature Rating 212°F
Sprinkler Response QR (Link)
Sprinkler K-Factor 16.8
Discharge Density 1.19 gpm/ft2
Discharge Pressure 50 psi
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1620.
In-Rack Sprinkler System
Sprinkler Type K=25.2 Extended Coverage Pendent
Deflector to Bottom of Horizontal Barrier
7.5 in.
Sprinkler Spacing 8 ft. 3 in. (Centered on the rack bays)
Temperature Rating 212°F
Sprinkler Response QR (Link)
Sprinkler K-Factor 16.8
Discharge Flowrate 138 gpm per sprinkler
Discharge Pressure 30 psi
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1621.
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1622.
8’ aisle 8’ aisle
IgnitionLocation
8’-3” OnCenter
(Typical)
4’-3” to edge of upright
• Plan View
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1623.
• Elevation View
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1624.
N-Rack-EC® Test #1 – August 8, 2012
• SprinklerOperationSequence
5-Nov-1625.
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1626.
N-Rack-EC® Test #1 – August 8, 2012
5-Nov-1627.
5-Nov-1628.
NFPA 13 2016 Edition
In-Rack Sprinkler
Protection Option
With Horizontal Barriers
Vs.
Reliable N-Rack-EC®
Performance Based Design Criteria
Comparison
New In-Rack Protection Option in NFPA 13 2016 ed.
= Horizontal Barrier= Longitudinal Flue Space Sprinklers= Face Sprinklers
`
Plan View
Elevation View
26 In-Rack Sprinklers!
5-Nov-1629.
N-Rack-EC® Typical Layout
2 In-Rack Sprinklers!
5-Nov-1630.
= Horizontal Barrier= Longitudinal Flue Space Sprinklers= Face Sprinklers
`
Elevation View
Elevation View
Plan View
5-Nov-1631.
NFPA 13 2016 Edition
Ceiling only protection for EEP
Vs.
Reliable N-Rack-EC®
Performance Based Design Criteria
Comparison
NFPA 13 ceiling only protection requires
9,815 LPM water demand
N252 EC in-rack system requires 6300 LPM for the ceiling and hose protection.
The in-rack demand is 1527 LPM not required to be added to the ceiling demand
Comparison
Comparison
Ceiling only protectionWith new technology In-Racks
N-Rack-EC® Spray Pattern Using Reliable N252 EC
522 lpm per flowing N-Rack-EC ® sprinkler!
N-Rack-EC® Spray Pattern Using Reliable N252 EC
Questions
5-Nov-1636.
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