Rhode Island Code of Regulations
Title 510 - Building Code Commission
Chapter 00 - N/A
Subchapter 00 - N/A
Part 2 - RISBC-2 Rhode Island State One amp; Two-Family Dwelling Code
Section 510-RICR-00-00-2.28 - Appendices

Universal Citation: 510 RI Code of Rules 00 00 2.28

Current through September 18, 2024

Add the Following

APPENDIX RP - RESIDENTIAL SPRINKLERS

Appendix RP is Informative only and is not part of this code

SECTION R-P2904 DWELLING UNIT FIRE SPRINKLER SYSTEMS

R-P2904.1 General.

Where installed, residential fire sprinkler systems, or portions thereof, shall be in accordance with NFPA 13D or Section P2904, which shall be considered equivalent to NFPA 13D. Section P2904 shall apply to stand-alone and multipurpose wet-pipe sprinkler systems that do not include the use of antifreeze. A multipurpose fire sprinkler system shall supply domestic water to both fire sprinklers and plumbing fixtures. A stand-alone sprinkler system shall be separate and independent from the water distribution system. A backflow flow preventer shall not be required to separate a stand-alone sprinkler system from the water distribution system.

R-P2904.1.1 Required sprinkler locations.

Sprinklers when installed shall protect all areas of a dwelling unit.

Exceptions:

1. 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 installed above the equipment; however, sprinklers shall not be required in the remainder of the space.

2. Clothes closets, linen closets and pantries not exceeding twenty-four (24) square feet (2.2 m2) in area, with the smallest dimension not greater than three feet (3') (915 mm) and having wall and ceiling surfaces of gypsum board.

3. Bathrooms not more than fifty-five (55) square feet (5.1 m2) in area.

4. Garages; carports; exterior porches; unheated entry areas, such as mud rooms, that are adjacent to an exterior door; and similar areas.

R-P2904.2 Sprinklers.

Sprinklers shall be new listed residential sprinklers and shall be installed in accordance with the sprinkler manufacturer's installation instructions.

R-P2904.2.1 Temperature rating and separation from heat sources.

Except as provided for in section P2904.2.2, sprinklers shall have a temperature rating of not less than one hundred thirty-five degrees Fahrenheit (135° F) (fiftyseven degrees Celsius (57° C)) and not more than one hundred seventy degrees Fahrenheit (170° F) (seventy-seven degrees Celsius (77° C)).

Sprinklers shall be separated from heat sources as required by the sprinkler manufacturer's installation instructions.

R-P2904.2.2 Intermediate temperature sprinklers.

Sprinklers shall have an intermediate temperature rating not less than one hundred seventy-five degrees Fahrenheit (175° F) (seventy-nine degrees Celsius (79° C)) and not more than two hundred twenty-five degrees Fahrenheit (225° F) (one hundred seven degrees Celsius (107° C)) where installed in the following locations:

1. Directly under skylights, where the sprinkler is exposed to direct sunlight.

2. In attics.

3. In concealed spaces located directly beneath a roof.

4. Within the distance to a heat source as specified in Table P2904.2.2

R-P2904.2.3 Freezing areas.

Piping shall be protected from freezing as required by section P2603.6. Where sprinklers are required in areas that are subject to freezing, dry-sidewall or drypendent sprinklers extending from a nonfreezing area into a freezing area shall be installed.

R-P2904.2.4 Sprinkler coverage.

Sprinkler coverage requirements and sprinkler obstruction requirements shall be in accordance with sections P2904.2.4.1 and P2904.2.4.2.

Table P2904.2.2 - Locations Where Intermediate Temperature Sprinklers are Required

Heat Source

Range of Distance from Heat Source within which Intermediate Temperature Sprinklers are Requireda, b (inches)

Fireplace, side of open or recessed fireplace

12 to 36

Fireplace, front of recessed fireplace

36 to 60

Coal and wood burning stove

12 to 42

Kitchen range top

9 to 18

Oven

9 to 18

Vent connector or chimney connector

9 to 18

Heating duct, not insulated

9 to 18

Hot water pipe, not insulated

6 to 12

Side of ceiling or wall warm air register

12 to 24

Front of wall mounted warm air register

18 to 36

Water heater, furnace or boiler

3 to 6

Luminaire up to 250 watts

3 to 6

Luminaire 250 watts up to 499 watts

6 to 12

For SI: 1 inch = 25.4 mm

aSprinklers shall not be located at distances less than the minimum table distance unless the sprinkler listing allows a lesser distance.

bDistances shall be measured in a straight line from the nearest edge of the heat source to the nearest edge of the sprinkler
R-P2904.2.4.1 Coverage area limit.

The area of coverage of a single sprinkler shall not exceed four hundred (400) square feet (37 m2) and shall be based on the sprinkler listing and the sprinkler manufacturer's installation instructions.

R-P2904.2.4.2 Obstructions to coverage.

Sprinkler discharge shall not be blocked by obstructions unless additional sprinklers are installed to protect the obstructed area. Sprinkler separation from obstructions shall comply with the minimum distances specified in the sprinkler manufacturer's instructions.

R-P2904.2.4.2.1 Additional requirements for pendent sprinklers.

Pendent sprinklers within three feet (3') (915 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 installed.

R-P2904.2.4.2.2 Additional requirements for sidewall sprinklers.

Sidewall sprinklers within five feet (5') (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 installed.

R-P2904.2.5 Sprinkler installation on systems assembled with solvent cement.

The solvent cementing of threaded adapter 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.

R-P2904.2.6 Sprinkler modifications prohibited.

Painting, caulking or modifying of sprinklers shall be prohibited. Sprinklers that have been painted, caulked, modified or damaged shall be replaced with new sprinklers.

R-P2904.3 Sprinkler piping system.

Sprinkler piping shall be supported in accordance with the requirements for cold water distribution piping. Sprinkler piping shall comply with all 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.

R-P2904.3.1 Nonmetallic pipe and tubing.

Nonmetallic pipe and tubing, such as CPVC and PEX, shall be listed for use in residential fire sprinkler systems.

R-P2904.3.1.1 Nonmetallic pipe protection.

Nonmetallic pipe and tubing systems shall be protected from exposure to the living space by a layer of not less than three eighths of one inch (3/8") (9.5 mm) thick gypsum wallboard, one half of one inch (1/2") inch-thick plywood (13 mm), or other material having a fifteen (15) minute fire rating.

Exceptions:

1. Pipe protection shall not be required in areas that do not require protection with sprinklers as specified in section P2904.1.1.

2. Pipe protection shall not be required where exposed piping is permitted by the pipe listing.

R-P2904.3.2 Shutoff valves prohibited.

With the exception of shutoff valves for the entire water distribution system, valves shall not be installed in any location where the valve would isolate piping serving one or more sprinklers.

R-P2904.3.3 Single dwelling limit.

Piping beyond the service valve located at the beginning of the water distribution system shall not serve more than one (1) dwelling.

R-P2904.3.4 Drain.

A means to drain the sprinkler system shall be provided on the system side of the water distribution shutoff valve.

R-P2904.4 Determining system design flow.

The flow for sizing the sprinkler piping system shall be based on the flow rating of each sprinkler in accordance with section P2904.4.1 and the calculation in accordance with section P2904.4.2.

R-P2904.4.1 Determining required flow rate for each sprinkler.

The minimum required flow for each sprinkler shall be determined using the sprinkler manufacturer's published data for the specific sprinkler model based on all of the following:

1. The area of coverage.

2. The ceiling configuration.

3. The temperature rating.

4. Any additional conditions specified by the sprinkler manufacturer.

R-P2904.4.2 System design flow rate.

The design flow rate for the system shall be based on the following:

1. The design flow rate for a room having only one (1) sprinkler shall be the flow rate required for that sprinkler, as determined by section P2904.4.1.

2. The design flow rate for a room having two (2) or more sprinklers a shall be determined by identifying the sprinkler in that room with the highest required flow rate, based on section P2904.4.1, and multiplying that flow rate by two (2).

3. 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 comply with the sprinkler manufacturer's instructions.

4. The design flow rate for the sprinkler system shall be the flow required by the room with the largest flow rate, based on Items 1, 2 and 3.

5. For the purpose of this section, it shall be permissible to reduce the design flow rate for a room by subdividing the space into two (2) 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 eight inches (8") (203 mm) in depth and each lintel shall form a solid barrier between the ceiling and the top of the opening.

R-P2904.5 Water supply.

The water supply shall provide not less than the required design flow rate for sprinklers in accordance with section P2904.4.2 at a pressure not less than that used to comply with section P2904.6.

R-P2904.5.1 Water supply from individual sources.

Where a dwelling unit water supply is from a tank system, a private well system or a combination of these, the available water supply shall be based on the minimum pressure control setting for the pump.

R-P2904.5.2 Required capacity.

The water supply shall have the capacity to provide the required design flow rate for sprinklers for a period of time as follows:

1. Seven (7) minutes for dwelling units one (1) story in height and less than two thousand (2,000) square feet (186 m2) in area.

2. Ten (10) minutes for dwelling units two (2) or more stories in height or equal to or greater than two thousand (2,000) square feet (186 m2) in area. Where a well system, a water supply tank system or a combination thereof is used, any combination of well capacity and tank storage shall be permitted to meet the capacity requirement.

R-P2904.6 Pipe sizing.

The piping to sprinklers shall be sized for the flow required by section P2904.4.2. The flow required to supply the plumbing fixtures shall not be required to be added to the sprinkler design flow.

R-P2904.6.1 Method of sizing pipe.
1. Piping supplying sprinklers shall be sized using the prescriptive method in section P2904.6.2 or by hydraulic calculation in accordance with NFPA 13D. The minimum pipe size from the water supply source to any sprinkler shall be three quarters of one inch (3/4") (19 mm) nominal.

2. Threaded adapter fittings at the point where sprinklers are attached to the piping shall be a minimum of one half of one inch (1/2") (13 mm) nominal.

R-P2904.6.2 Prescriptive pipe sizing method.

Pipe shall be sized by determining the available pressure to offset friction loss in piping and identifying a piping material, diameter and length using the equation in section P2904.6.2.1 and the procedure in section P2904.6.2.2.

R-P2904.6.2.1 Available pressure equation.

The pressure available to offset friction loss in the interior piping system (Pt) shall be determined in accordance with the Equation 29-1.

Pt = Psup-PLsvc-PLm-PLd-PLe-Psp (Equation 29-1) where: Pt = Pressure used in applying Tables P2904.6.2(4) through P2904.6.2(9).

Psup = Pressure available from the water supply source.

PLsvc = Pressure loss in the water-service pipe.

PLm = Pressure loss in 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.

R-P2904.6.2.2 Calculation procedure.

Determination of the required size for water distribution piping shall be in accordance with the following procedure:

Step 1 - Determine Psu Obtain the static supply pressure that will be available from the water main from the water purveyor, or for an individual source, the available supply pressure shall be in accordance with section P2904.5.1.

Step 2 - Determine PLsvc Use Table P2904.6.2(1) to determine the pressure loss in the water service pipe based on the selected size of the water service.

Step 3 - Determine PLm Use Table P2904.6.2(2) to determine the pressure loss from the water meter, based on the selected 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 rate from section P2904.4.2, except that five (5) gpm (0.3 L/S) shall be added where the device is installed in a water-service pipe that supplies more than one (1) dwelling.

As 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 P2904.6.2(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 any individual sprinkler based on the flow rate from section P2904.4.1. The required pressure is provided in the sprinkler manufacturer's published data for the specific sprinkler model based on the selected flow rate.

Step 7 - Calculate Pt Using Equation 29-1, calculate the pressure available to offset friction loss in water-distribution piping between the service valve and the sprinklers.

Step 8 - Determine the maximum allowable pipe length Use Tables P2904.6.2(4) through P2904.6.2(9) to select a material and size for water distribution piping. The piping material and size shall be acceptable if the developed length of pipe between the service valve and the most remote sprinkler does not exceed the maximum allowable length specified by the applicable table. Interpolation of Pt between the tabular values shall be permitted. The maximum allowable length of piping in Tables P2904.6.2(4) through P2904.6.2(9) incorporates an adjustment for pipe fittings, and no additional consideration of friction losses associated with pipe fittings shall be required.

R-P2904.7 Instructions and signs.

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 flows and pressures to fight a fire. Devices that restrict the flow or 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."

R-P2904.8 Inspections.

The water distribution system shall be inspected in accordance with sections P2904.8.1 and P2904.8.2.

R-P2904.8.1 Pre-concealment inspection.

The following items shall be verified prior to the concealment of any sprinkler system piping:

1. Sprinklers are installed in all areas as required by section P2904.1.1.

2. Where sprinkler water spray patterns are obstructed by construction features, luminaries or ceiling fans, additional sprinklers are installed as required by section P2904.2.4.2.

3. Sprinklers are the correct temperature rating and are installed at or beyond the required separation distances from heat sources as required by sections P2904.2.1 and P2904.2.2.

4. The pipe size equals or exceeds the size used in applying Tables P2904.6.2(4) through P2904.6.2(9) or, if the piping system was hydraulically calculated in accordance with section P2904.6.1, the size used in the hydraulic calculation.

5. The pipe length does not exceed the length permitted by Tables P2904.6.2(4) through P2904.6.2(9) or, if the piping system was hydraulically calculated in accordance with section P2904.6.1, pipe lengths and fittings do not exceed those used in the hydraulic calculation.

6. Nonmetallic piping that conveys water to sprinklers is listed for use with fire sprinklers.

7. Piping is supported in accordance with the pipe manufacturer's and sprinkler manufacturer's installation instructions.

8. The piping system is tested in accordance with section P2503.7.

R-P2904.8.2 Final inspection.

The following items shall be verified upon completion of the system:

1. Sprinkler are not painted, damaged or otherwise hindered from operation.

2. Where a pump is required to provide water to the system, the pump starts automatically upon system water demand.

3. 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.

4. The sign or valve tag required by section P2904.7 is installed and the owner's manual for the system is present.

Table P2904.6.2(1) - Water Service Pressure Loss (PLsvc)a,b

Flow Ratec (gpm )

3/4 INCH WATER SERVICE PRESSURE LOSS (psi)

1 INCH WATER SERVICE PRESSURE LOSS (psi)

1 1/4 INCH WATER SERVICE PRESSURE LOSS (psi)

Length of water service pipe (feet)

Length of water service pipe (feet)

Length of water service pipe (feet)

40 or less

41 to 75

76 to 100

101 to 150

40 or less

41 to 75

76 to 100

101 to 150

40 or les s

41 to 75

76 to 100

101 to 150

8

5.1

8.7

11.8

17.4

1.5

2.5

3.4

5.1

0.6

1.0

1.3

1.9

10

7.7

13.1

17.8

26.3

2.3

3.8

5.2

7.7

0.8

1.4

2.0

2.9

12

10.8

18.4

24.9

NP

3.2

5.4

7.3

10.7

1.2

2.0

2.7

4.0

14

14.4

24.5

NP

NP

4.2

7.1

9.6

14.3

1.6

2.7

3.6

5.4

16

18.4

NP

NP

NP

5.4

9.1

12.4

18.3

2.0

3.4

4.7

6.9

18

22.9

NP

NP

NP

6.7

11.4

15.4

22.7

2.5

4.3

5.8

8.6

20

27.8

NP

NP

NP

8.1

13.8

18.7

27.6

3.1

5.2

7.0

10.4

22

NP

NP

NP

NP

9.7

16.5

22.3

NP

3.7

6.2

8.4

12.4

24

NP

NP

NP

NP

11.4

19.3

26.2

NP

4.3

7.3

9.9

14.6

26

NP

NP

NP

NP

13.2

22.4

NP

NP

5.0

8.5

11.4

16.9

28

NP

NP

NP

NP

15.1

25.7

NP

NP

5.7

9.7

13.1

19.4

30

NP

NP

NP

NP

17.2

NP

NP

NP

6.5

11.0

14.9

22.0

32

NP

NP

NP

NP

19.4

NP

NP

NP

7.3

12.4

16.8

24.8

34

NP

NP

NP

NP

21.7

NP

NP

NP

8.2

13.9

18.8

NP

36

NP

NP

NP

NP

24.1

NP

NP

NP

9.1

15.4

20.9

NP

For SI: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) gallon per minute = 0.053 L/s, one (1) pound per square inch = 6.895 kPa.

NP - Not permitted. Pressure loss exceeds reasonable limits.

a. Values are applicable for underground piping materials listed in Table P2905.4 and are based on an SDR of 11 and a Hazen Williams C Factor of one hundred fifty (150).

b. Values include the following length allowances for fittings: twenty-five percent (25%) length increase for actual lengths up to one hundred feet (100') and fifteen percent (15%) length increase for actual lengths over one hundred feet (100').

c. Flow rate from section P2904.4.2. Add five (5) gpm to the flow rate required by section P2904.4.2 where the water-service pipe supplies more than one (1) dwelling.

Table P2904.6.2(2) - Minimum Water Meter Pressure Loss (PLm)a

FLOW RATE (gallons per minute, gpm)b

5/8-INCH METER PRESSURE LOSS (pounds per square inch, psi)

3/4-INCH METER PRESSURE LESS (pounds per square inch, psi)

1-INCH METER PRESSURE LOSS (pounds per square inch, psi)

8

2

1

1

10

3

1

1

12

4

1

1

14

5

2

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: one inch (1") = 25.4 mm, one (1) pound per square inch = 6.896 kPa, one (1) gallon per minute = 0.063 L/s.

NP - Not permitted unless the actual water meter pressure loss is known.

a. Table 2904.6.2(2) establishes conservative values for water meter pressure loss or installations where the water meter loss is unknown. Where the actual water meter pressure loss is known, Pm shall be the actual loss.

b. Flow rate from section P2904.4.2. Add five (5) gpm to the flow rate required by section P2904.4.2 where the water-service pipe supplies more than one (1) dwelling.

Table P2904.6.2(3) - Elevation Loss (PLe)

ELEVATION (feet)

PRESSURE LOSS (psi)

5

2.2

10

4.4

15

6.5

20

8.7

25

10.9

30

13

35

15.2

40

17.4

For SI: one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa.

Table P2904.6.2(4) - Allowable Pipe Length for three quarter (3/4) Inch Type M Copper

Water Tubing

SPRINKLE R FLOW RATEa (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

65 0

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

220

241

281

321

361

401

441

481

12

3/4

102

137

171

205

239

273

307

241

375

410

13

3/4

88

118

147

177

206

235

265

294

324

353

14

3/4

77

103

128

154

18 0

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

14 0

16 0

18 0

20 0

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

10 0

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: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa, one (1) gallon per minute - 0.963 L/s.

NP - Not permitted

a. Flow rate from section P2904.4.2.

Table P2904.6.2(5) - Allowable Pipe Length for 1-inch Type M Copper Water Tubing SPRINKLER FLOW RATEa (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

586

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

92

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: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa, one (1) gallon per minute - 0.963 L/s.

a. Flow rate from Section P2904.4.2.

Table P2904.6.2(6) - Allowable Pipe Length for 3/4-inch CPVC Pipe

SPRINKLER FLOW RATEa (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

137

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

26

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: one inch (1") = 25.4 mm, one foot (1') - 304.8 mm, one (1) pound per square inch - 6.895 kPa, one (1) gallon per minute = 0.0963 L/s.

a. Flow rate from Section P2904.4.2.

Table P2904.6.2(7) - Allowable Pipe Length for 1-inch CPVC Pipe

SPRINKLER FLOW RATEa (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

1049

1398

1748

2098

2447

2797

3146

3496

3845

4195

9

1

843

1125

1406

1687

1968

2249

2530

2811

3093

3374

10

1

694

925

1157

1388

1619

1851

2082

2314

2545

2776

11

1

582

776

970

1164

1358

1552

1746

1940

2133

2327

12

1

495

660

826

991

1156

1321

1486

1651

1816

1981

13

1

427

570

712

854

997

1139

1281

1424

1566

1709

14

1

372

497

621

745

869

993

1117

1241

1366

1490

15

1

328

437

546

656

765

874

983

1093

1202

1311

16

1

291

388

485

582

679

776

873

970

1067

1164

17

1

260

347

433

520

607

693

780

867

954

1040

18

1

234

312

390

468

546

624

702

780

858

936

19

1

212

282

353

423

494

565

635

706

776

847

20

1

193

247

321

385

449

513

578

642

706

770

21

1

176

235

293

352

410

469

528

586

645

704

22

1

1161

215

269

323

377

430

484

538

592

646

23

1

1149

198

248

297

347

396

446

496

545

595

24

1

137

183

229

275

321

366

412

458

504

550

25

1

1127

170

212

255

297

340

382

425

467

510

26

1

118

158

197

237

276

316

355

395

434

474

27

1

111

147

184

221

258

295

332

368

405

442

28

1

103

138

172

207

241

275

310

344

379

413

29

1

97

129

161

194

226

258

290

323

355

387

30

1

91

121

152

182

212

242

273

303

333

364

31

1

86

114

143

171

200

228

257

285

314

342

32

1

81

108

134

161

188

215

242

269

296

323

33

1

176

102

127

152

178

203

229

254

280

305

34

1

72

96

120

144

168

192

216

240

265

289

35

1

68

91

114

137

160

182

205

228

251

273

36

1

165

87

108

130

151

173

195

216

238

260

37

1

62

82

103

123

144

165

185

206

226

247

38

1

59

78

98

117

137

157

176

196

215

235

39

1

56

75

93

112

131

149

168

187

205

224

40

1

53

71

89

107

125

142

160

178

196

214

For SI: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa, one (1) gallon per minute = 0.963 L/s.

a Flow rate from Section P2904.4.2.

Table P2904.6.2(8) - Allowable Pipe Length for 3/4-inch PEX Tubing

WATER

Available Pressure - Pt (psi)

15

20

25

30

35

40

45

50

55

60

SPRINKLER FLOW RATEa (gpm)

DISTRIBUTION SIZE (inch)

Allowable length of pipe from service valve to farthest sprinkler (feet)

8

3/4

93

123

154

185

216

247

278

309

339

370

9

3/4

74

99

124

149

174

199

223

248

273

298

10

3/4

61

82

102

123

143

163

184

204

225

245

11

3/4

51

68

86

103

120

137

154

171

188

205

12

3/4

44

58

73

87

102

117

131

146

160

175

13

3/4

38

50

63

75

88

101

113

126

138

151

14

3/4

33

44

55

66

77

88

99

110

121

132

15

3/4

29

39

48

58

68

77

87

96

106

116

16

3/4

26

34

43

51

60

68

77

86

94

103

17

3/4

23

31

38

46

54

61

69

77

84

92

18

3/4

21

28

34

41

48

55

62

69

76

83

19

3/4

19

25

31

37

44

50

56

62

69

75

20

3/4

17

23

28

34

40

45

51

57

62

68

21

3/4

16

21

26

31

36

41

47

52

57

62

22

3/4

NP

19

24

28

33

38

43

47

52

57

23

3/4

NP

17

22

26

31

35

39

44

48

52

24

3/4

NP

16

20

24

28

32

36

40

44

49

25

3/4

NP

NP

19

22

26

30

34

37

41

45

26

3/4

NP

NP

17

21

24

28

31

35

38

42

27

3/4

NP

NP

16

20

23

26

29

33

36

39

28

3/4

NP

NP

15

18

21

24

27

30

33

36

29

3/4

NP

NP

NP

17

20

23

26

28

31

34

30

3/4

NP

NP

NP

16

19

21

24

27

29

32

31

3/4

NP

NP

NP

15

18

20

23

25

28

30

32

3/4

NP

NP

NP

NP

17

19

21

24

26

28

33

3/4

NP

NP

NP

NP

16

18

20

22

25

27

34

3/4

NP

NP

NP

NP

NP

17

19

21

23

25

35

3/4

NP

NP

NP

NP

NP

16

18

20

22

24

36

3/4

NP

NP

NP

NP

NP

15

17

19

21

23

37

3/4

NP

NP

NP

NP

NP

NP

16

18

20

22

38

3/4

NP

NP

NP

NP

NP

NP

16

17

19

21

39

3/4

NP

NP

NP

NP

NP

NP

NP

16

18

20

40

3/4

NP

NP

NP

NP

NP

NP

NP

16

17

19

For SI: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa, one (1) gallon per minute = 0.963 L/s.

NP - Not permitted.

a Flow rate from Section P2904.4.2.

Table P2904.6.2(9) - Allowable Pipe Length for 1-inch PEX Tubing

SPRINKLER FLOW RATEa (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: one inch (1") = 25.4 mm, one foot (1') = 304.8 mm, one (1) pound per square inch = 6.895 kPa, one (1) gallon per minute = 0.963 L/s.

a. Flow rate from Section P2904.4.2.

Disclaimer: These regulations may not be the most recent version. Rhode Island may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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