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COMPARISON OF SPRINKLER DESIGN CRITERIA
1. SPRINKLER INSTALLATION
NFPA 13
Sprinklers are needed wherever there are combustible materials either in the building construction or in its contents, including
the following locations;
a. in noncombustible buildings wherever contents are combustible, including areas where flammable liquids are stored or used.
b. throughout all buildings of combustible construction or those having appreciable amounts of combustible componenets.
c. as the basic protection at hazardous processes such as those involving flammable liquids, even though protected with fixed
extinguishing system.
d. in concealed spaces of combustible construction such as floors, roofs and low attics except where the ceiling is attached
directly to the underside of the supporting beams of a combustible roof or floor and fire stopping is provided.
e. in vacant spaces under the first story of building with combustible floors and under the combustible floors of exterior docks,
platform and piers
f. under roofs over outside loading platforms or docks and under other exterior canopies except where construction is
noncombustible and the area under the canopy is not used for storage
g. in enclosed equipment such as ovens, dryers, dust collectors, large ducts, spray booths, paper machine hoods, paper
machine economizers, part of textile preparatory machines and similar enclosures where combustible materials are processed
or combustible wastes or deposits may accumulate
h. in small enclosed structures such as a penthouses, stairways, passageways, small offices, stockrooms, closets or similar
enclosures of combustible construction or containing combustible material.
i. in elevator towers, including in and under penthouses and in elevator machine rooms.
j. under cutting tables regardless of with and under ducts and storage shelves including slatted decks that are over 4ft (1.20m)
wide, where there are combustible beneath. Sprinklers are needed under ducts of less width if distribution from ceiling
sprinklers is obstructed.
k. at exposed steelwork supporting process equipment such as large tanks, stills, pipelines or equipment containing flammable
chemicals or liquids so constructed or located that the steel would not be well protected by the usual installation of
building sprinklers
l. where combustible storage or construction is introduced in areas where buildings and contents are otherwise noncombustible
m. telephone equipment rooms
BS EN 12845
where a building is to be protected, all areas of that building or of a communicating building shall be sprinkler protected
except in some cases indicated
sprimkler protection shall be considered in the following cases, but may be omitted after due consideration of the fire load in
each cases;
a. washrooms and toilets (but not cloakroom) of non combustible materials and which are not used to store combustible mat'ls
b. enclosed staircases and enclosed vertical shafts (i.e lift or service shafts) containing no combustible material and construc-
ted as a fire resistant separation
c. rooms protected by other automatic extinguishing systems (i.e gas, powder and water spray)
d. wet processes such as the wet end of paper making machines
sprinkler protection shall not be provided in the following areas of a building or plant;
a. silos or bins containing substances which expand on contact with water
b. in the vicinity of industrial furnaces or kilns, salt baths, smelting ladles or similar equipment if the hazard would be increased
by the use of water in extinguishing a fire
c. areas, rooms or places where water discharge might present a hazard. In these cases other automatic extinguishing system
should be considered(i.e gas or powder)
the separation between a sprinkler protected area and a non protected area shall have a fire resistance specified by the
authority but in no case less than 60 minutes. Door shall be self closing or be closed automatically in case of fire.
2.. SPRINKLER SYSTEM TYPES
NFPA 13
Antifreeze sprinkler system - a wet pipe sprinkler system employing automatic sprinklers that are attached to a piping system
that contains an antifreeze solution and that are connected to a water supply. The antifreeze solution is discharged followed
by water, immediately upon operation of sprinklers opened by heat from a fire.
Circulating closed looped sprinkler system - a wet pipe sprinkler system having non-fire protection coonections to auto-
matic sprinkler systems in a closed looped piping arrangement for the purpose of utilizing sprinkler piping to conduct water for
heating or cooling, where water is not removed or used from the system but only circulated through the piping system.
Combined dry pipe - preaction sprinkler system - a sprinkler system employing automatic sprinklers attached to a piping
system containing air under pressure with a supplemental detection system installed in the same area as the sprinklers.
operation of the detection system actuates tripping devices that open dry pipe valves simultaneously and withot loss of air
pressure in the system. Operation of the detection system also opens listed air exhaust valves at the end of feed main which
usually precedes the opening of sprinklers. The detection system also serves as an automatic fire alarm system.
Deluge sprinkler system - a sprinkler system employing open sprinklers that are attached to a piping system that is connected
to a water supply through a valve that is opened by the operation of a detection system installed in the same area as the
sprinklers. When the valve opens, water flows into the piping system and discharges from all sprinklers attached thereto.
Dry pipe sprinkler system - a sprinkler system employing automatic sprinklers that are attached to a piping system containing
air or nitrogen under pressure, the release of which permits the water pressure to open a valve known as a dry pipe valve and
the water then flows into the piping system and out of the opened sprinklers.
Gridded sprinkler system - a sprinkler system in which parallel cross mains are connected by multiple branch lines. An
operating sprinkler will receive water from both ends of its branchline while other branch line help transfer water between
crossmains.
Looped sprinkler system - a sprinkler system in which multiple crossmains are tied together so as to provide more than one
path for water to flow to an operating sprinkler and branchline that are not tied together
Preaction sprinkler system - a sprinkler system employing automatic sprinklers that are attached to a piping system that
contains air that might or might not be under pressure, with a supplemental detection system installed in the same area as the
sprinklers
Wet pipe sprinkler system - a sprinkler system employing automatic sprinklers attached to piping system containing water and
connected to water supply so that water discharges immediately from sprinklers opened by heat from a fire
BS EN 12845
Wet pipe are installation that are permanently charged with water under pressure. Wet pipe installation shall be installed only
in premises where there is no possibility of frost damaged to the installation and where the ambient temperature will not
exceed 95 deg C. Installation subject to freezing may be protected by anti-freeze liquid or trace heating.
Dry pipe are installation that are normally charged with air or inert gas under pressure downstream of dry alarm valve and
water under pressure upstream of the dry alarm valve. A permanent air/inert gas supply to maintain the pressure in the pipe-
work shall be installed. The installation shall be pressurized to fall within the pressure range recommended by the alarm valve
supplier.
Alternate installation incorporate either and alternate alarm valve or a composite set comprising a wet alarm valve and a dry
alarm valve. During winter
Pre-action installations shall be one of the following types;
Type A pre-action installation is normal dry pipe installation in which the control valve set is activated by automatic fire
detection system but not by the operation of the sprinklers. The gas/inert gas pressure in the installation shall be monitored at
all times. A t least one quick opening manually operated valve shall be installed in an appropriate position to enable the
pre-action valve to be activated in an emergency.
Type B installation is otherwise normal dry pipe installation in which the control valve set is activated either by an automatic
fire detection system or by the operation of the sprinklers. Independently of the response of the detectors, a pressure drop
in the pipework causes the opening of the alarm valve. Type B pre-action installation may be installed wherever a dry pipe is
called for and the spread of fire is expected to be rapid. They may also be used instead of ordinary dry pipe systems with or
without an accelarator or exhauster
Where a sprinkler system includes more than one pre-action sprinkler installation, a risk assessment shall be undertaken to
establish wether simultaneous operation of more than one pre-action installation could occur. Where simultaneous charging
of pre-action sprinkler installations may occur, the following shall be implemented
a) the volume of stored water supplies shall be increased by the volume of the pre-action installations
b) the time between multiple pre-action installations tripping and water discharging from any remote test valve on the installa-
tions under consideration shall not exceed 60 sec.
3. CLASSIFICATION OF OCCUPANCYClassification of occupancy relate to sprinkler installation and their water supply.
These occupancy classification should be used to develop criteria for maximum allowable
sprinkler spacing.
NFPA 13 BS EN 12845
Light hazard occupancies Light hazard occupancies
occupancies or portion of other occupancies where the qty schools and other educational institutions
and/or combustibility contents is low and fires with prison
relatively low rate of heat release are expected. Light hazard offices (with no single compartment greater than 126m2 with a fire
occupancies includes occupancies having similar to: resistance of at least 30 min)
churches Ordinary hazard 1 occupancies
club cement works
eaves and overhang sheet metal product factories
educational hospitals
hospitals hotels
institutional libraries (excluding bookstores)
libraries, except large stack rooms restaurants
museums schools
nursing or convalescent room offices
office including data processing data processing (computer room excluding tape storage)
residential
restaurant seating area
theater and auditorium Ordinary hazard 2 occupancies
unused attic photographic film factories
metal working
abattoirs,meat factories
bakeries
biscuit factories
NFPA 13 BS EN 12845Ordinary hazard grp-1 occupancies
occupancies or portions of other occupancies where com- breweries
bustibility is low, quantity of combustible is moderate, chocolate factories
stockpiles of combustibles do not exceed 2.40m high and confectionery
fires with moderate rates of heat release are expected. dairies factories
Ordinary hazard grp-1 occupancies include occupancies laboratories (physical)
having conditions similar to: laundries
car parks
automobile parking and showrooms museums
bakeries and beverage naufacturing leather goods factories
canneries
dairy products manufacturing and processing
electronic plants Ordinary hazard 3 occupancies
glass and glass product manufacturing glass factories
laundries dyers work
restaurant service areas soap factories
photographic laboratories
Ordinary hazard grp-2 occupancies paint application shops with water based paint
occupancies or portion of occupancies where quantity and electronics factories
combustibility is moderate to high. Stockpiles do not exceed radio equipment factories
3.70m high and fire with moderate to high rates of heat washing machine factories
release are expected. Ordinary hazard grp-2 occupancies car workshops
includes occupancies having conditions similar to: animal fodder factories
corn mills
cereal mills sugar factories
chemical plants-ordinary dehydrated vegetable and soup factories
confectionary products broadcasting studios
distilleries railway stations
dry cleaners plant (technical) room
feed mills farm building
horse stables book binding factories
leather goods manufacturing cardboard factories
NFPA 13 BS EN 12845
libraries-large stackroom areas paper factories
machine shops shopping centre
metal working carpet factories (excluding rubber and foam plastics)
mercantile fibre board factories
paper and pulp mills footwear factories (excluding plastics and rubber)
paper process plants knitting factories
pier and wharves linen factories
post office mattress factories (excluding foam plastics)
printing and publishing sewing factories
repair garages weaving mills
stages woolen and worsted mills
textile manufacturing woodworking factories
tire manufacturing furniture factories (without foam, plastics)
tobacco product manufacturing furniture showrooms
wood machining upholstery (without foam and plastics) factories
wood product assembly
Extra hazard grp-1 occupancies High hazard Process occupancies (HHP1)
these occupancies includes occupancies similar to:
upholstering with plastic foam floor cloth and linoleum manufacture
aircraft hangar resin, lamp black and turpentine manufacture
combustible hydraulic fluid use area rubber substitute manufacture
die casting wood wool manufacture
metal extruding paint application shops with solvent
plywood and particle board manufacturing refrigerator factories
printing printing works
rubber reclaiming cable factories for PP/PE/PS or similar burning characteristics other
saw mills than Ordinary hazard 3 (OH3)
textile picking injection moulding (plastics) for PP/PE/PS or similar burning charac-
burlap teristics other than ordinary hazard 3 (OH3)
NFPA 13 BS EN 12845
Extra hazard grp-2 occupancies rubber good factories
these occupancies includes occupancies similar to: synthetic fibre factories (excluding acrylic)
rope factories
asphalt saturating carpet factories including unexpanded plastics
flammable liquid spraying footwear factories including plastics and rubber
flow coating
manufactured home
open oil quenching High hazard Process occupancies (HHP2)
plastic processing
solvent cleaning fire lighter manufacture
varnish and paint dipping tar distilling
depots for buses, un-laden lorries and railway carriages
candle wax and paraffin manufacturers
paper machine halls
carpet factories including rubber and foam plastics
saw mill
chipboard manufacturing (1)
paint, colour and varnish manufacture
High hazard Process occupancies (HHP3)
cellulose nitrate manufacture
rubber tires for cars and lorries
manufacture of material factor M3 (material which are predominant-
ly unexpanded plastic) foam plastics, foam rubber and
rubber goods
High hazard Process occupancies (HHP4)
firework manufacture
4. SPRINKLER SPACING AND PROTECTION AREAS
NFPA 13protection areas and maximum spacing of standard spray pendent and upright sprinklers
protec- spacing protec- spacing protec- spacing protec- spacing
tion area max. tion area max. tion area max. tion area max.
construction type m2 m m2 m m2 m m2 m
non combustible
obstructed and
unobstructed and
combustible un-
obstructed 20.9 4.5 12.1 4.5 9.3 3.6 9.3 3.6
combustible
obstructed 15.6 4.5 12.1 4.5 9.3 3.6 9.3 3.6
protection areas and maximum spacing of standard sidewall spray sprinklers
max.distance along the wall(S)
max.room width (L)
max.protection area
combustible finish non combustible or limited
ordinary hazardlight hazard
or limited combustible fin.
combustible finish non combustible or limited
or limited combustible fin.
light hazard ordinary hazard extra hazard high piled storage
3
3
7.4
3
3
9.3
4.26
3.65
11.15
4.26
3.65
18.2
protection areas and maximum spacing of extended coverage spray pendent and upright sprinklers
protec- spacing protec- spacing protec- spacing protec- spacing
tion area max. tion area max. tion area max. tion area max.
construction type m2 m m2 m m2 m m2 m
37.18 6
30 5.48
37.18 6 23.98 4.87
30 5.48 18.21 4.26 18.21 4.26 18.21 4.26
unobstructed 23.98 4.87 13.38 3.65 13.38 3.65 13.38 3.65
37.18 6
obstructed non- 30 5.48
combustible(when 37.18 6 23.98 4.87
specifically listed 30 5.48 18.21 4.26 18.21 4.26 18.21 4.26
for such use) 23.98 4.87 13.38 3.65 13.38 3.65 13.38 3.65
obstructed combus-
ble N/A N/A N/A N/A N/A N/A N/A N/A
protection areas and maximum spacing of extended coverage sidewall spray sprinklers
unobstructed, smooth, flat
light hazard ordinary hazard extra hazard high piled storage
7.3
light hazard
spacing (ft)
ordinary hazard
protection area (m2) spacing (ft)
37.18
protection area (m2)construction type
8.5 37.18
BS EN 12845
maximum coverage and spacing for sidewall sprinklers
hazard max. area room room rows of spacing
class per sprin- between width,w length, l sidewall pattern
kler (m2) sprinklers sprinklers
(m) (m) (m)
W≤3.7 any 1 single line
3.7< w≤7.4 ≤9.2 2 standard
3.7< w≤7.4 ≤9.2 2 standard
LH 17 4.6 w>7.4 any 2 staggered
W≤3.7 any 1 single line
3.7< w≤7.4 ≤6.8 2 standard
3.7< w≤7.4 ≤6.8 2 staggered
OH 9 3.4 w>7.4 any 2 standard
hazard class max. area/sprinkler
maximum coverage and spacing for sprinkler other than sidewall
m2 standard layout staggered layout
maximum distances, m
21 4.6 4.6LH
OH
HHP
12 4 4.6
9 3.7 3.7
2.3
spacing along walls
sprinklers
to end of
wall (m)
1.8
5. WATER DEMAND REQUIREMENT AND TANK CAPACITY
NFPA 13Used in Pipe schedule method
Water supply requirement for Pipe schedule sprinkler system
occupancy min. residual acceptable flow duration in min. tank size
classification pressure req'd at base of riser minutes ft3 (m3)
light hazard 15 psi (1.034 bar) 500-750 gpm 30-60 min 2010 (57)
ordinary hazard 20 psi (1.38 bar) 850- 1500 gpm 60-90 min 6809 (193)
Used in Hydraulic Calculation method (values shall be added to the sprinkler water demand)
Hose stream demand and water supply duration requirement
occupancy Inside hose total duration in
classification (gpm) minutes
light hazard 0,50,100 100 30
ordinary hazard 0,50,100 250 60
extra hazard 0,50,100 500 90
BS EN 12845
Pressure and flow requirements for pre-calculated LH and OH systems
hazard flow pressure at the max. demand pressure at the
class (lpm) control valve set flow (lpm) control valve set
(bar) (bar)
LH
(wet &preaction) 225 2.2+ p s ………..
OH1
(wet &preaction) 375 1.0+ p s 540
OH1
(dry&alternate)
OH2
(wet &preaction) 725 1.4+ p s 1000
OH2
(dry&alternate)
OH3
(wet &preaction) 1100 1.7+ p s 1350
OH3
(dry&alternate)
OH4
(wet &preaction) 1800 2.0+ p s 2100 1.5+ p s
notes;
p s = is the static head loss due to the height of the highest sprinkler in the array concerned above the control valve set, in bar
LH water duration is 30 min.
OH water duration is 60 min.
HHP water duration is 90 min
0.7+ p s
…………
1.0+ p s
1.4+ p s
BS EN 12845
minimum effective capacity of reduced capacity tanks
hazard class minimum effective capacity, m3
LH (wet or pre-action) 5
OH1 (wet or pre-action) 10
OH1 (dry or alternate) 20
OH2 (wet or pre-action) 20
OH2 (dry or alternate) 30
OH3 (wet or pre -action) 30
OH3 (dry or alternate) 50
OH4 (wet or pre -action) 50
HHP and HHS 70, but in no case less than 10% of the full capacity
the following conditions shall be met for reduced capacity tanks;
1. the inflow shall be from a town main and shall be automatic, via at least two (20) mechanical float valves
the inflow shall not adversely influence the pump suction. The failure of a single float valve shall not impair the required infill rate
2. the effective capacity of the tank shall be no less than the figure above
3. the tank capacity plus the inflow shall be sufficient to supply the system at full capacity
4.it shall be possible to check the capacity of the inflow
5. the inflow arrangement shall be accessible for inspection
6. AREAS OF SPRINKLER OPERATION AND DENSITY
NFPA 13
operation (m2)
139
139
232
occupancy
classification
light hazard
ordinary hazard
extra hazard
areas of sprinkler
4.1
6.1 (ord.haz.1) 8.1 (ord.haz.2)
12.2 (ext. haz 1) 16.3 (ext.haz 2)
density
(l/min)m2
BS EN 12845
hazard design density area of operation (m2)
class mm/min wet or preaction dry or alternate
LH
OH1
OH2
OH3
OH4
HHP1
HHP2
HHP3
HHP4
7. SYSTEM PRESSURE
NFPA 136.90 bar is the minimum system pressure while 12.10 bar is the maximum pressure. 24 bar is the maximum shut off pressure
BS EN 12845Except during testing, water pressure shall not exceed 12 bar at equipment connectios. The pressure in pumped system shall take into
account any increase in driver speed and pressure due to closed valve condition
7.50
90
180
270
not allowed used HHP1
2.25 84
325
325
325
deluge (see note)
10.00
12.50
72
144
216
360
260
260
260
not allowed used OH1
5.00
5.00
5.00
5.00
8. POCKET CEILING AND CONCEALED SPACES PROTECTION
NFPA 13
Sprinklers shall be required In all ceiling pockets. Sprinklers shall not be required in ceiling pockets if all the following are met ;
1. the total volume of the unprotected ceiling pocket does not exceed 1000 ft3 (28.3m3)
2. the depth of the unprotected ceiling pocket does not exceed 36 in. (914mm)
3. the entire floor under the unprotected ceiling pocket is protected by sprinklers at the lower ceiling elevation
4. the total size of all unprotected ceiling pockets in the same compartment within 10 ft (3.0m) of each other does not
exceed 1000ft3 (28.3m3)
5. the unprotested ceiling pocket has non combustible or limited-combustible finishes
6. quick response sprinklers are utilized throughout the compartment
BS EN 12845
1. if the height of the concealed space at roof and floor exceeds 0.80m measured between the underside of the roof and the top
of the suspended ceiling or between the floor and the underside of the rasised floor, these spaces shall be sprinkler protected.
2. if the height of the concealed space at roof and floor is no greater than 0.80m, the spaces shall be sprinkler protected only if they
contain combustible materials or are constructed with combustible materials. Electric cables with voltage less than 250V, single phase
with a maximum of 15 cables per tray are allowed