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610.4 Sizing Water Supply and Distribution Systems

2021 Oregon Plumbing Specialty Code > 6 Water Supply and Distribution > 610.0 Size of Potable Water Piping > 610.4 Sizing Water Supply and Distribution Systems
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Systems within the range of Table 610.4 shall be permitted to be sized from that table or by the method in accordance with Section 610.5.
Listed parallel water distribution systems shall be installed in accordance with their listing, but at no time shall a portion of the system exceed the maximum velocities allowed by the code.

TABLE 610.4
FIXTURE UNIT TABLE FOR DETERMINING WATER PIPE AND METER SIZES
METER AND STREET SERVICE
(inches)		 BUILDING SUPPLY AND BRANCHES
(inches)		 MAXIMUM ALLOWABLE LENGTH
(feet)
40 60 80 100 150 200 250 300 400 500 600 700 800 900 1000
PRESSURE RANGE — 30 to 45 psi1
3/4 1/22 6 5 4 3 2 1 1 1 0 0 0 0 0 0 0
3/4 3/4 16 16 14 12 9 6 5 5 4 4 3 2 2 2 1
3/4 1 29 25 23 21 17 15 13 12 10 8 6 6 6 6 6
1 1 36 31 27 25 20 17 15 13 12 10 8 6 6 6 6
3/4 11/4 36 33 31 28 24 23 21 19 17 16 13 12 12 11 11
1 11/4 54 47 42 38 32 28 25 23 19 17 14 12 12 11 11
11/2 11/4 78 68 57 48 38 32 28 25 21 18 15 12 12 11 11
1 11/2 85 84 79 65 56 48 43 38 32 28 26 22 21 20 20
11/2 11/2 150 124 105 91 70 57 49 45 36 31 26 23 21 20 20
2 11/2 151 129 129 110 80 64 53 46 38 32 27 23 21 20 20
1 2 85 85 85 85 85 85 82 80 66 61 57 52 49 46 43
11/2 2 220 205 190 176 155 138 127 120 104 85 70 61 57 54 51
2 2 370 327 292 265 217 185 164 147 124 96 70 61 57 54 51
2 21/2 445 418 390 370 330 300 280 265 240 220 198 175 158 143 133
PRESSURE RANGE — 46 to 60 psi1
3/4 1/22 7 7 6 5 4 3 2 2 1 1 1 0 0 0 0
3/4 3/4 20 20 19 17 14 11 9 8 6 5 4 4 3 3 3
3/4 1 39 39 36 33 28 23 21 19 17 14 12 10 9 8 8
1 1 39 39 39 36 30 25 23 20 18 15 12 10 9 8 8
3/4 11/4 39 39 39 39 39 39 34 32 27 25 22 19 19 17 16
1 11/4 78 78 76 67 52 44 39 36 30 27 24 20 19 17 16
11/2 11/4 78 78 78 78 66 52 44 39 33 29 24 20 19 17 16
1 11/2 85 85 85 85 85 85 80 67 55 49 41 37 34 32 30
11/2 11/2 151 151 151 151 128 105 90 78 62 52 42 38 35 32 30
2 11/2 151 151 151 151 150 117 98 84 67 55 42 38 35 32 30
1 2 85 85 85 85 85 85 85 85 85 85 85 85 85 83 80
11/2 2 370 370 340 318 272 240 220 198 170 150 135 123 110 102 94
2 2 370 370 370 370 368 318 280 250 205 165 142 123 110 102 94
2 21/2 654 640 610 580 535 500 470 440 400 365 335 315 285 267 250
PRESSURE RANGE — Over 60 psi1
3/4 1/22 7 7 7 6 5 4 3 3 2 1 1 1 1 1 0
3/4 3/4 20 20 20 20 17 13 11 10 8 7 6 6 5 4 4
3/4 1 39 39 39 39 35 30 27 24 21 17 14 13 12 12 11
1 1 39 39 39 39 38 32 29 26 22 18 14 13 12 12 11
3/4 11/4 39 39 39 39 39 39 39 39 34 28 26 25 23 22 21
1 11/4 78 78 78 78 74 62 53 47 39 31 26 25 23 22 21
11/2 11/4 78 78 78 78 78 74 65 54 43 34 26 25 23 22 21
1 11/2 85 85 85 85 85 85 85 85 81 64 51 48 46 43 40
11/2 11/2 151 151 151 151 151 151 130 113 88 73 51 51 46 43 40
2 11/2 151 151 151 151 151 151 142 122 98 82 64 51 46 43 40
1 2 85 85 85 85 85 85 85 85 85 85 85 85 85 85 85
11/2 2 370 370 370 370 360 335 305 282 244 212 187 172 153 141 129
2 2 370 370 370 370 370 370 370 340 288 245 204 172 153 141 129
2 21/2 654 654 654 654 654 650 610 570 510 460 430 404 380 356 329
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 pound-force per square inch = 6.8947 kPa
Notes:
1 Available static pressure after head loss.
2 Building supply, not less than 3/4 of an inch (20 mm) nominal size.
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