Where residential sprinkler systems
are required in one and two family dwellings or townhouses,
the systems shall be installed by an ASSE Series
7000 certified installer in accordance with this section or
NFPA 13D. This section shall be considered equivalent to
NFPA 13D. Partial residential sprinkler systems shall be
permitted to be installed in buildings not required to be
equipped with a residential sprinkler system.
This section shall apply to standalone
and multipurpose wet-pipe sprinkler systems that do
not include the use of antifreeze. A multipurpose fire sprinkler
system shall provide potable water to both fire sprinklers
and plumbing fixtures. A stand-alone sprinkler system
shall be separate and independent from the potable water distribution system.
Sprinklers
shall be installed to protect all floor areas of a dwelling
unit in one and two family dwellings or townhouses.
Exceptions:
Attics, crawl spaces, and normally unoccupied
concealed spaces that do not contain fuel-fired
appliances do not require sprinklers. In attics,
crawl spaces, and normally unoccupied concealed
spaces that contain fuel-fired equipment, a sprinkler
shall be provided to protect the equipment;
however, sprinklers shall not be required in the
remainder of the space.
Clothes closets, linen closets, and pantries that do
not exceed 24 square feet (2.2 m2) in area, with the
smallest dimension not exceeding 3 feet (914 mm)
and having wall and ceiling surfaces of gypsum
board.
Bathrooms and toilet rooms that do not exceed 55
square feet (5.1 m2) in area.
Detached garages; carports; with no habitable
space above; open attached porches; unheated
entry areas, such as mud rooms, that are adjacent
to an exterior door; and similar areas.
Covered unheated projections of the building at
entrances/exits provided it is not the only means of
egress from the dwelling unit.
Ceiling pockets that meet the following requirements:
The total volume of an unprotected ceiling
pocket does not exceed 100 cubic feet (2.83 m3).
The entire floor under the unprotected ceiling
pocket is protected by the sprinklers at the
lower ceiling elevation.
Each unprotected ceiling pocket is separated
from an adjacent unprotected ceiling pocket
by not less than a 10 feet (3048 mm) horizontal
distance.
The interior finish of the unprotected ceiling
pocket is noncombustible material.
Sprinklers shall have a temperature rating
of not less than 135°F (57°C) and not more than
170°F (77°C). Sprinklers shall be separated from heat
sources in accordance with the sprinkler manufacturer's
installation instructions.
Exception: Sprinklers located close to a heat source in accordance with Section 612.3.3.1 shall be intermediate temperature sprinklers.
Sprinklers shall have an intermediate temperature
rating of not less than 175°F (79°C) and not more
than 225°F (107°C) where installed in the following
locations:
Directly under skylights, where the sprinkler is
exposed to direct sunlight.
In attics and concealed spaces located directly
beneath a roof.
Within the distance to a heat source in accordance
with Table 612.3.3.1.
TABLE 612.3.3.1
LOCATIONS WHERE INTERMEDIATE TEMPERATURE
SPRINKLERS ARE REQUIRED
HEAT SOURCE
DISTANCE FROM HEAT SOURCE1
MINIMUM DISTANCE2 (inches)
MAXIMUM DISTANCE (inches)
Fireplace, Side of Open or Recessed Fireplace
12
36
Fireplace, Front of Recessed Fireplace
36
60
Coal and Wood burning Stove
12
42
Kitchen Range Top
9
18
Oven
9
18
Vent Connector or Chimney Connector
9
18
Heating Duct, Not Insulated
9
18
Hot Water Pipe, Not Insulated
6
12
Side of Ceiling or Wall Warm Air Register
12
24
Front of Wall Mounted Warm Air Register
18
36
Water Heater, Furnace, or Boiler
3
6
Luminaire up to 250 Watts
3
6
Luminaire 250 Watts up to 499 Watts
6
12
For SI units: 1 inch = 25.4 mm
Notes:
1 Distances shall be measured in a straight line from the nearest edge of
the heat source to the nearest edge of the sprinkler.
2 Sprinklers shall not be located at distances less than the minimum table
distance unless the sprinkler listing allows a lesser distance.
The piping system shall be protected in accordance with the requirements of Chapter 3. Where sprinklers are required in areas that are
subject to freezing, dry-sidewall or dry-pendent sprinklers
extending from a non-freezing area into a freezing
area shall be installed. Where fire sprinkler piping
cannot be adequately protected against freezing, the
system shall be designed and installed in accordance
with NFPA 13D.
The area of coverage of
a single sprinkler shall be based on the sprinkler listing
and the sprinkler manufacturer's installation instructions.
The area of coverage of a single sprinkler shall
not exceed 400 square feet (37.16 m2).
The
water discharge from a sprinkler shall not be blocked by
obstructions unless additional sprinklers are installed to
protect the obstructed area. Additional sprinklers shall
not be required where sprinkler separation from obstructions
is in accordance with the requirements of Table
612.3.6, or the minimum distances specified in the sprinkler
manufacturer's installation instructions.
TABLE 612.3.6
MINIMUM SEPARATION FROM OBSTRUCTION
PENDENT SPRINKLERS
DISTANCE FROM DEFLECTOR TO PLANE AT BOTTOM OF OBSTRUCTION (A) (inches)
MINIMUM DISTANCE TO OBSTRUCTION (B) (feet)
1
11/2
3
3
5
4
7
41/2
9
6
11
61/2
14
7
SIDEWALL SPRINKLER
SIDE OBSTRUCTION
DISTANCE FROM DEFLECTOR TO PLANE AT BOTTOM OF OBSTRUCTION (A) (inches)
MINIMUM DISTANCE TO OBSTRUCTION (B) (feet)
1
11/2
3
3
5
4
7
41/2
9
6
11
61/2
14
7
SIDEWALL SPRINKLER
SIDE OBSTRUCTION
DISTANCE FROM DEFLECTOR TO PLANE AT BOTTOM OF OBSTRUCTION (A) (inches)
Pendent sprinklers located within 3
feet (914 mm) of the center of a ceiling fan, surface-mounted ceiling luminaire, or similar object
shall be considered to be obstructed and additional
sprinklers shall be provided.
Sidewall sprinklers located within 5
feet (1524 mm) of the center of a ceiling fan, surface-mounted ceiling luminaire, or similar object
shall be considered to be obstructed and additional
sprinklers shall be provided.
Sprinklers
shall not be painted, caulked, or modified. A
sprinkler that has been painted, caulked, modified, or
damaged shall be replaced with a new sprinkler.
Sprinkler piping shall be installed in
accordance with the requirements for water distribution
piping. Sprinkler piping shall comply with the material
requirements for cold water distribution piping. For
multipurpose piping systems, the sprinkler piping shall
connect to and be a part of the cold water distribution
piping system.
Nonmetallic
pipe and tubing, such as CPVC, PEX-AL-PEX, PE-RT,
and PEX, shall be certified for residential sprinkler
installations and shall have a pressure rating of not less
than 130 psi (896 kPa) at 120°F (49°C).
Nonmetallic
pipe and tubing systems shall be protected
from exposure to the occupied space by a layer of
not less than 3/8 of an inch (9.5 mm) thick gypsum wallboard, 1/2 of an inch (12.7 mm) thick plywood,
or other material having a 15 minute fire rating.
Exceptions:
Pipe protection shall not be required in areas
that are not required to be protected with
sprinklers in accordance with Section 612.3.1.
Pipe protection shall not be required where
exposed piping is permitted by the pipe third
party listing.
The solvent
cementing of fittings shall be completed and
threaded adapters for sprinklers shall be verified as
being clear of excess cement prior to the installation
of sprinklers on systems assembled with solvent
cement.
Shutoff valves
shall not be installed in a location where the valve
would isolate piping serving one or more sprinklers.
Shutoff valves shall only be permitted for the entire
water distribution system.
The sizing
of the sprinkler piping system shall be based on the
flow rate and pressure of each sprinkler in accordance
with Section 612.5.1.1 and the number of sprinklers in
accordance with Section 612.5.1.3.
The minimum flow rate and pressure
for each residential sprinkler shall be in accordance
with the manufacturer's published data for
the specific sprinkler model based on the following:
The area of coverage
The ceiling configuration
The temperature rating
Additional conditions specified by the sprinkler manufacturer
The flow rate used
for sizing the sprinkler piping system shall be
based on the following:
The flow rate for a room having only one
sprinkler shall be the flow rate required for the
sprinkler in accordance with Section 612.5.1.1.
The flow rate for a room having two or more
sprinklers shall be determined by identifying
the sprinkler in the room with the highest
required flow rate in accordance with Section
612.5.1.1, and multiplying that flow rate by 2.
Where the sprinkler manufacturer specifies
different criteria for ceiling configurations that
are not smooth, flat, and horizontal the
required flow rate for that room shall be in
accordance with the sprinkler manufacturer's
instructions.
The flow rate used for sizing the sprinkler system
shall be the flow required by the room
with the largest flow rate in accordance with
Section 612.5.1.2(1), Section 612.5.1.2(2),
and Section 612.5.1.2(3).
For the purpose of this section, it shall be permissible
to reduce the flow rate for a room by
subdividing the space into two or more rooms,
where each room is evaluated separately with
respect to the required design flow rate. Each
room shall be bounded by walls and a ceiling.
Openings in walls shall have a lintel not less
than 8 inches (203 mm) in depth and each lintel
shall form a solid barrier between the ceiling
and the top of the opening.
Attached
garages and carports with habitable space above
shall be protected by fire sprinklers in accordance
with this Section and Section R313. Protection
shall be provided in accordance with one of the
following:
Residential Sprinklers installed in accordance
with their listing.
Extended Coverage sprinklers discharging
water not less than their listed flow rate for
Light Hazard in accordance with NFPA 13.
Quick-Response spray sprinklers at light hazard
spacing in accordance with NFPA 13
designed to discharge at 0.05 gpm/ft2 density
(minimum).
The system demand shall be permitted to be
limited to the number of sprinklers in the compartment
but shall not exceed two sprinklers
for hydraulic calculation purposes. Garage
doors shall not be considered obstructions
and shall be permitted to be ignored for placement
and calculation of sprinklers.
The water supply for a multipurpose or stand alone sprinkler system
shall be provided by the public water main, private
water main, private well system, or storage tank. The
water supply required shall be determined in accordance
with Section 612.5.1.2 at a pressure not less than
that used in accordance with Section 612.5.3. Where a water supply serves both domestic and fire sprinkler
systems, 5 gpm (19 L/min) shall be added to the sprinkler
system demand at the point where the systems are
connected, to determine the size of common piping and
the size of the total water supply requirements where
no provision is made to prevent flow into the domestic
water system upon operation of a sprinkler.
Where a dwelling unit water supply is
from a tank system, a private well system, a pump or a combination of these, the available water pressure
shall be based on the minimum pressure control setting of the pump.
The water supply
shall have the capacity to provide the required flow
rate to the sprinklers for a period of time as follows:
Seven minutes for one story dwelling units
less than 2000 square feet (185.81 m2) in area.
For the purpose of determining the area of the
dwelling unit, the area of attached garages
and attached open carports, porches, balconies
and patios shall not be included.
Ten minutes for multi-level dwelling units and one story dwelling units not less than 2000
square feet (185.81 m2) in area. For the purpose of determining the area of the dwelling
unit, the area of attached garages and
attached open carports, porches, balconies,
and patios shall not be included.
Where a well system, a water supply tank system, a pump, or a combination thereof is used the
water supply shall serve both domestic and fire
sprinkler systems. A combination of well capacity
and tank storage shall be permitted to meet the
capacity requirement.
The sprinkler piping
shall be sized for the flow rate in accordance with Section
612.5.1. The flow rate required to supply the plumbing fixtures shall not be required to be added to
the sprinkler design flow for multipurpose or stand-alone
piping systems. The sizing of the water supply to
the plumbing fixtures shall be determined in accordance
with this chapter. For multipurpose piping systems,
the largest pipe size required based on either the
sprinkler piping calculations or the water distribution
piping calculations shall be installed.
The
sprinkler pipe shall be sized using the prescriptive
method in Section 612.5.3.2 or by hydraulic calculation
in accordance with NFPA 13D. The sprinkler
pipe size from the water supply source to a sprinkler
shall be not less than 3/4 of an inch (20 mm) in
diameter. Threaded adapter fittings at the point
where sprinklers are attached to the piping shall be
not less than 1/2 of an inch (15 mm) in diameter.
The
sprinkler pipe shall be sized by determining the
available pressure to offset friction loss in piping
and based on the piping material, diameter and
length using the equation in Section 612.5.3.2.1
and the procedure in Section 612.5.3.2.2.
Pressure used for sizing the system in Table 612.5.3.2(4) through Table 612.5.3.2(9)
Psup
=
Pressure available from the water supply source
PLws
=
Pressure loss in the water service pipe
PLm
=
Pressure loss through the water meter
PLd
=
Pressure loss from devices other than the water meter
PLe
=
Pressure loss associated with changes in elevation
Psp
=
Maximum pressure required by a sprinkler
TABLE 612.5.3.2(4)
ALLOWABLE PIPE LENGTH FOR 3/4 INCH TYPE M COPPER WATER TUBING*
SPRINKLER FLOW RATE (gpm)
WATER DISTRIBUTION SIZE (inch)
AVAILABLE PRESSURE - Pt (psi)
15
20
25
30
35
40
45
50
55
60
ALLOWABLE LENGTH OF PIPE FROM SERVICE VALVE TO FARTHEST SPRINKLER (feet)
8
3/4
217
289
361
434
506
578
650
723
795
867
9
3/4
174
232
291
349
407
465
523
581
639
697
10
3/4
143
191
239
287
335
383
430
478
526
574
11
3/4
120
160
200
241
281
321
361
401
441
481
12
3/4
102
137
171
205
239
273
307
341
375
410
13
3/4
88
118
147
177
206
235
265
294
324
353
14
3/4
77
103
128
154
180
205
231
257
282
308
15
3/4
68
90
113
136
158
181
203
226
248
271
16
3/4
60
80
100
120
140
160
180
200
220
241
17
3/4
54
72
90
108
125
143
161
179
197
215
18
3/4
48
64
81
97
113
129
145
161
177
193
19
3/4
44
58
73
88
102
117
131
146
160
175
20
3/4
40
53
66
80
93
106
119
133
146
159
21
3/4
36
48
61
73
85
97
109
121
133
145
22
3/4
33
44
56
67
78
89
100
111
122
133
23
3/4
31
41
51
61
72
82
92
102
113
123
24
3/4
28
38
47
57
66
76
85
95
104
114
25
3/4
26
35
44
53
61
70
79
88
97
105
26
3/4
24
33
41
49
57
65
73
82
90
98
27
3/4
23
30
38
46
53
61
69
76
84
91
28
3/4
21
28
36
43
50
57
64
71
78
85
29
3/4
20
27
33
40
47
53
60
67
73
80
30
3/4
19
25
31
38
44
50
56
63
69
75
31
3/4
18
24
29
35
41
47
53
59
65
71
32
3/4
17
22
28
33
39
44
50
56
61
67
33
3/4
16
21
26
32
37
42
47
53
58
63
34
3/4
NP
20
25
30
35
40
45
50
55
60
35
3/4
NP
19
24
28
33
38
42
47
52
57
36
3/4
NP
18
22
27
31
36
40
45
49
54
37
3/4
NP
17
21
26
30
34
38
43
47
51
38
3/4
NP
16
20
24
28
32
36
40
45
49
39
3/4
NP
15
19
23
27
31
35
39
42
46
40
3/4
NP
NP
18
22
26
29
33
37
40
44
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
* NP - Means not permitted.
TABLE 612.5.3.2(5)
ALLOWABLE PIPE LENGTH FOR 1 INCH TYPE M COPPER WATER TUBING
SPRINKLER FLOW RATE (gpm)
WATER DISTRIBUTION SIZE (inch)
AVAILABLE PRESSURE - Pt (psi)
15
20
25
30
35
40
45
50
55
60
ALLOWABLE LENGTH OF PIPE FROM SERVICE VALVE TO FARTHEST SPRINKLER (feet)
8
1
806
1075
1343
1612
1881
2149
2418
2687
2955
3224
9
1
648
864
1080
1296
1512
1728
1945
2161
2377
2593
10
1
533
711
889
1067
1245
1422
1600
1778
1956
2134
11
1
447
596
745
894
1043
1192
1341
1491
1640
1789
12
1
381
508
634
761
888
1015
1142
1269
1396
1523
13
1
328
438
547
657
766
875
985
1094
1204
1313
14
1
286
382
477
572
668
763
859
954
1049
1145
15
1
252
336
420
504
588
672
756
840
924
1008
16
1
224
298
373
447
522
596
671
745
820
894
17
1
200
266
333
400
466
533
600
666
733
799
18
1
180
240
300
360
420
479
539
599
659
719
19
1
163
217
271
325
380
434
488
542
597
651
20
1
148
197
247
296
345
395
444
493
543
592
21
1
135
180
225
270
315
360
406
451
496
541
22
1
124
165
207
248
289
331
372
413
455
496
23
1
114
152
190
228
267
305
343
381
419
457
24
1
106
141
176
211
246
282
317
352
387
422
25
1
98
131
163
196
228
261
294
326
359
392
26
1
91
121
152
182
212
243
273
304
334
364
27
1
85
113
142
170
198
226
255
283
311
340
28
1
79
106
132
159
185
212
238
265
291
318
29
1
74
99
124
149
174
198
223
248
273
298
30
1
70
93
116
140
163
186
210
233
256
280
31
1
66
88
110
132
153
175
197
219
241
263
32
1
62
83
103
124
145
165
186
207
227
248
33
1
59
78
98
117
137
156
176
195
215
234
34
1
55
74
92
111
129
148
166
185
203
222
35
1
53
70
88
105
123
140
158
175
193
210
36
1
50
66
83
100
116
133
150
166
183
199
37
1
47
63
79
95
111
126
142
158
174
190
38
1
45
60
75
90
105
120
135
150
165
181
39
1
43
57
72
86
100
115
129
143
158
172
40
1
41
55
68
82
96
109
123
137
150
164
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
TABLE 612.5.3.2(6)
ALLOWABLE PIPE LENGTH FOR 3/4 INCH IPS CPVC PIPE
SPRINKLER FLOW RATE (gpm)
WATER DISTRIBUTION SIZE (inch)
AVAILABLE PRESSURE - Pt (psi)
15
20
25
30
35
40
45
50
55
60
ALLOWABLE LENGTH OF PIPE FROM SERVICE VALVE TO FARTHEST SPRINKLER (feet)
8
3/4
348
465
581
697
813
929
1045
1161
1278
1394
9
3/4
280
374
467
560
654
747
841
934
1027
1121
10
3/4
231
307
384
461
538
615
692
769
845
922
11
3/4
193
258
322
387
451
515
580
644
709
773
12
3/4
165
219
274
329
384
439
494
549
603
658
13
3/4
142
189
237
284
331
378
426
473
520
568
14
3/4
124
165
206
247
289
330
371
412
454
495
15
3/4
109
145
182
218
254
290
327
363
399
436
16
3/4
97
129
161
193
226
258
290
322
354
387
17
3/4
86
115
144
173
202
230
259
288
317
346
18
3/4
78
104
130
155
181
207
233
259
285
311
19
3/4
70
94
117
141
164
188
211
234
258
281
20
3/4
64
85
107
128
149
171
192
213
235
256
21
3/4
58
78
97
117
136
156
175
195
214
234
22
3/4
54
71
89
107
125
143
161
179
197
214
23
3/4
49
66
82
99
115
132
148
165
181
198
24
3/4
46
61
76
91
107
122
317
152
167
183
25
3/4
42
56
71
85
99
113
127
141
155
169
26
3/4
39
52
66
79
92
105
118
131
144
157
27
3/4
37
49
61
73
86
98
110
122
135
147
28
3/4
34
46
57
69
80
92
103
114
126
137
29
3/4
32
43
54
64
75
86
96
107
118
129
30
3/4
30
40
50
60
70
81
91
101
111
121
31
3/4
28
38
47
57
66
76
85
95
104
114
32
3/4
27
36
45
54
63
71
80
89
98
107
33
3/4
25
34
42
51
59
68
76
84
93
101
34
3/4
24
32
40
48
56
64
72
80
88
96
35
3/4
23
30
38
45
53
61
68
76
83
91
36
3/4
22
29
36
43
50
57
65
72
79
86
37
3/4
20
27
34
41
48
55
61
68
75
82
38
3/4
20
27
33
39
46
52
59
65
72
78
39
3/4
19
25
31
37
43
50
56
62
68
74
40
3/4
18
24
30
35
41
47'
53
59
65
71
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
TABLE 612.5.3.2(7)
ALLOWABLE PIPE LENGTH FOR 1 INCH IPS CPVC PIPE
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
TABLE 612.5.3.2(8)
ALLOWABLE PIPE LENGTH FOR 3/4 INCH PEX TUBING*
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
* NP - Means not permitted.
TABLE 612.5.3.2(9)
ALLOWABLE PIPE LENGTH FOR 1 INCH PEX TUBING
SPRINKLER FLOW RATE (gpm)
WATER DISTRIBUTION SIZE (inch)
AVAILABLE PRESSURE - Pt (psi)
15
20
25
30
35
40
45
50
55
60
ALLOWABLE LENGTH OF PIPE FROM SERVICE VALVE TO FARTHEST SPRINKLER (feet)
8
1
314
418
523
628
732
837
941
1046
1151
1255
9
1
252
336
421
505
589
673
757
841
925
1009
10
1
208
277
346
415
485
554
623
692
761
831
11
1
174
232
290
348
406
464
522
580
638
696
12
1
148
198
247
296
346
395
445
494
543
593
13
1
128
170
213
256
298
341
383
426
469
511
14
1
111
149
186
223
260
297
334
371
409
446
15
1
98
131
163
196
229
262
294
327
360
392
16
1
87
116
145
174
203
232
261
290
319
348
17
1
78
104
130
156
182
208
233
259
285
311
18
1
70
93
117
140
163
187
210
233
257
280
19
1
63
84
106
127
148
169
190
211
232
253
20
1
58
77
96
115
134
154
173
192
211
230
21
1
53
70
88
105
123
140
158
175
193
211
22
1
48
64
80
97
113
129
145
161
177
193
23
1
44
59
74
89
104
119
133
148
163
178
24
1
41
55
69
82
96
110
123
137
151
164
25
1
38
51
64
76
89
102
114
127
140
152
26
1
35
47
59
71
83
95
106
118
130
142
27
1
33
44
55
66
77
88
99
110
121
132
28
1
31
41
52
62
72
82
93
103
113
124
29
1
29
39
48
58
68
77
87
97
106
116
30
1
27
36
45
54
63
73
82
91
100
109
31
1
26
34
43
51
60
68
77
85
94
102
32
1
24
32
40
48
56
64
72
80
89
97
33
1
23
30
38
46
53
61
68
76
84
91
34
1
22
29
36
43
50
58
65
72
79
86
35
1
20
27
34
41
48
55
61
68
75
82
36
1
19
26
32
39
45
52
58
65
71
78
37
1
18
25
31
37
43
49
55
62
68
74
38
1
18
23
29
35
41
47
53
59
64
70
39
1
17
22
28
33
39
45
50
56
61
67
40
1
16
21
27
32
37
43
48
53
59
64
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 gallon per minute = 0.06 L/s, 1 inch = 25 mm, 1 foot = 304.8 mm
The following procedure shall be used to determine the minimum size of the residential sprinkler piping:
Step 1 - Determine Psup
Obtain the supply pressure available from the
water main from the water purveyor, or for an
individual source, the available supply pressure
shall be in accordance with Section
612.5.2.1. The pressure shall be the flowing
pressure available at the flow rate used when
applying Table 612.5.3.2(1).
Step 2 - Determine PLws
Use Table 612.5.3.2(1) to determine the pressure loss in the water service pipe based on
the size of the water service. Where the water
service supplies more than one dwelling unit,
5 gpm (0.3 L/s) shall be added to the sprinkler
flow rate.
Step 3 - Determine PLm
Use Table 612.5.3.2(2) to determine the pressure
loss from the water meter based on the
water meter size.
Step 4 - Determine PLd
Determine the pressure loss from devices, other than the water meter, installed in the piping system supplying sprinklers such as pressure-reducing valves, backflow preventers, water softeners, or water filters. Device pressure losses shall be based on the device manufacturer's specifications. The flow rate used to determine pressure loss shall be the sprinkler flow rate from Section 612.5.1.2. As an alternative to deducting pressure loss for a device, an automatic bypass valve shall be
installed to divert flow around the device
when a sprinkler activates.
Step 5 - Determine PLe
Use Table 612.5.3.2(3) to determine the pressure
loss associated with changes in elevation.
The elevation used in applying the table shall
be the difference between the elevation where
the water source pressure was measured and
the elevation of the highest sprinkler.
Step 6 - Determine Psp
Determine the maximum pressure required by
an individual sprinkler based on the flow rate
from Section 612.5.1.1. The minimum pressure
required is specified in the sprinkler manufacturer's
published data for the specific sprinkler
model based on the selected flow rate.
Step 7 - Calculate Pt
Using Equation 612.5.3.2.1, calculate the
available system pressure for sizing the sprinkler
piping.
Step 8 - Determine the maximum allowable
pipe length
Use Table 612.5.3.2(4) through Table
612.5.3.2(9) to select a material and size for
the residential sprinkler piping. The piping
material and size shall be acceptable where the developed length of pipe between the inside water service valve and the most remote sprinkler does not exceed the maximum allowable length specified by the applicable
table. Interpolation of Pt bctween the
tabular values shall be permitted.
The maximum allowable length of piping in
Table 612.5.3.2(4) through Table 612.5.3.2(9)
incorporates an adjustment for pipe fittings, and
no additional consideration of friction losses
associated with pipe fittings shall be required.
TABLE 612.5.3.2(1)
WATER SERVICE PRESSURE LOSS (PLws)1, 2, 3
For SI units: 1 gallon per minute = 0.06 L/s, 1 pound-force per square inch= 6.8947 kPa, 1 inch = 25 mm, 1 foot = 304.8 mm
Notes:
1 Values arc applicable for underground piping materials and are based on polyethylene pipe having an SDR of 11 and a Hazen Williams C Factor of 150.
2 Values include the following length allowances for fittings: 25 percent length increase for actual lengths up to 100 feet (30480 mm) and 15 percent length
increase for actual lengths over 100 feet (30480 mm).
3 NP - Means not permitted.
TABLE 612.5.3.2(2)
MINIMUM WATER METER PRESSURE LOSS (PLm)1, 2
FLOW RATE (gpm)
5/8 INCH METER PRESSURE LOSS (psi)
3/4 INCH METER PRESSURE LOSS (psi)
1 INCH METER PRESSURE LOSS (psi)
8
2
1
1
10
3
1
1
12
4
18.4
1
14
5
24.5
1
16
7
3
1
18
9
4
1
20
11
4
2
22
NP
5
2
24
NP
5
2
26
NP
6
2
28
NP
6
2
30
NP
7
2
32
NP
7
3
34
NP
8
3
36
NP
8
3
For SI units: 1 gallon per minnte = 0.06 L/s, 1 pound-force per square
inch = 6.8947 kPa, 1 inch = 25 mm
Notes:
1 Table 612.5.3.2(2) establishes conservative values for water meter
pressure loss for installations where the water meter loss is unknown.
Where the actual water meter pressure loss is known, PLm shall be the
pressure loss as specified by the meter manufacturer.
An owner's manual for the
fire sprinkler system shall be provided to the owner. A sign
or valve tag shall be installed at the main shutoff valve to
the water distribution system stating the following: "Warning,
the water system for this home supplies fire sprinklers
that require certain flow and pressure to fight a fire.
Devices that restrict the flow, decrease the pressure, or
automatically shut off the water to the fire sprinkler system,
such as water softeners, filtration systems, and automatic
shutoff valves shall not be added to this system without a
review of the fire, sprinkler system by a fire protection specialist.
Do not remove this sign."
The following
shall be verified prior to the concealment of any sprinkler
system piping:
Sprinklers are installed in all areas in accordance with Section 612.3.1
Where sprinkler water spray patterns are obstructed by construction features, luminaries or ceiling fans, additional sprinklers are installed in accordance with Section 612.3.6.
Sprinklers are the correct temperature rating and are installed at or beyond the required separation distances from heat sources in accordance with Section 612.3.3 and Section 612.3.3.1.
The minimum pipe size in accordance with the requirements of Table 612.5.3.2(4) through Table 612.5.3.2(9) or, where the piping system was hydraulically calculated in accordance with Section 612.5.3.1, the size used in the hydraulic calculation.
The pipe length does not exceed the length permitted by Table 612.5.3.2(4) through Table 612.5.3.2(9) or, where the piping system was hydraulically calculated in accordance with Section 612.5.3.1, pipe lengths and fittings shall not exceed those used in the hydraulic calculation.
Nonmetallic piping that conveys water to sprinklers is certified as having a pressure rating of not less than 130 psi (896 kPa) at 120°F (49°C).
Piping is properly supported.
The piping system is tested in accordance with Section 609.4.
Upon completion of the residential sprinkler system, the system shall be inspected. The following shall be verified during the final inspection:
Sprinklers are not painted, damaged, or otherwise hindered from operation.
Where a pump is required to provide water to the system, the pump starts automatically upon system water demand.
Pressure reducing valves, water softeners, water filters, or other impairments to water flow that were not part of the original design have not been installed.
The sign or valve tag in accordance with Section 612.6 is installed and the owner's manual for the system is present.
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of the residentialsprinklersystem, the system shall be inspected. The following shall be verified during the final inspection:
Sprinklers are not painted ...
