Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Bulletin No. 4660-PGP2T
55
Parflex
®
Flexible Gas Piping System
Design and Installation GuideSection 7.0 Sizing Tables
7.1 CSST Tables (Continued)
Natural Gas
Caution: Locate proper sizing table based on total pressure drop allowed in piping system by local utility for each
installation.
Note: Table 8 does include the effects of pressure drop across the line regulator. If regulator pressure drop exceeds 1 psig across 325-3 or
325-5A regulators, DO NOT USE THIS TABLE. CONTACT PARKER AT 1-888-FASTMATE.
*Table includes losses for four 90 degree bends and two end fittings. To determine flow capacity for tubing runs with additional bends and/or
fittings, add the appropriate number of feet to the actual run length using the formula: L = 1.3n. L = number of feet to be added to actual run
length; n = number of additional bends and/or fittings.
Table 10*
Maximum Flow Capacity of Parker Parflex Tubing in Cubic Feet per Hour
Gas Pressure: 2.0 psig; Pressure Drop: 1.5 psig
(Based on a 0.60 Specific Gravity Gas)
Part Tube
Tubing Length (ft.)
No. Size 5 10 15 20 25 30 40 50 60 70 80 90 100 125 150 200 250 300 350 400 450 500
PGP-6 3/8”
483 334 269 231 205 186 160 142 129 119 111 104 98 87 79 68 60 55 51 47 44 42
PGP-8 1/2”
1005 715 586 509 456 417 362 325 297 275 257 243 231 207 189 164 147 135 125 117 110 105
PGP-12 3/4”
1853 1331 1097 956 860 788 687 618 566 526 494 467 444 399 366 319 287 263 244 229 217 206
PGP-16 1”
5326 3766 3075 2663 2382 2174 1883 1684 1537 1423 1331 1255 1191 1065 972 842 753 688 637 595 561 533
PGP-20 1-1/4”
8494 6109 5037 4393 3951 3623 3159 2841 2605 2343 2272 2148 2043 1838 1685 1469 1321 1212 1126 1057 999 950
PGP-32 2"
27028 19325 15882 13818 12403 11356
9880 8868 8119 7288 7064 6672 6341 5692 5211 4534 4069 3726 3458 3241 3062 2910
Table 11*
Maximum Flow Capacity of Parker Parflex Tubing in Cubic Feet per Hour
Gas Pressure: 5.0 psig; Pressure Drop: 3.5 psig
(Based on a 0.60 Specific Gravity Gas)
Part Tube
Tubing Length (ft.)
No. Size 5 10 15 20 25 30 40 50 60 70 80 90 100 125 150 200 250 300 350 400 450 500
PGP-6 3/8”
756 524 423 363 323 293 252 224 203 187 174 164 155 138 125 107 96 87 80 74 70 66
PGP-8 1/2”
1540 1102 907 789 709 649 565 507 465 431 405 382 363 326 299 260 234 214 199 186 176 167
PGP-12 3/4”
2817 2034 1681 1469 1322 1214 1060 955 876 815 765 724 689 621 570 498 448 411 383 359 340 323
PGP-16 1”
8755 6143 4993 4310 3846 3504 3024 2698 2458 2272 2122 1998 1893 1689 1539 1329 1185 1080 996 932 878 832
PGP-20 1-1/4”
12709
9140 7537 6573 5911 5420 4727 4251 3898 3623 3400 3215 3057 2750 2521 2199 1977 1813 1685 1581 1495 1422
PGP-32 2"
40729 29122 23933 20822 18691 17112 14888 13364 12235 11356 10645 10055
9555 8577 7853 6832 6133 5615 5211 4885 4614 4385
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