Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Bulletin No. 4660-PGP2T
53
Parflex
®
Flexible Gas Piping System
Design and Installation Guide
Natural Gas
Caution: Locate proper sizing table based on total pressure drop allowed in piping system by local utility for each
installation.
Section 7.0 Sizing Tables
7.1 CSST Tables (Continued)
Note: Tables 6 and 7 do not include the effects of pressure drop across the line regulator. If regulator pressure drop exceeds 22" WC across 325-3 or 325-5A regulators, DO NOT USE
TABLES 5 and 6. 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 4*
Maximum Flow Capacity of Parker Parflex Tubing in Cubic Feet per Hour
Gas Pressure: 0.5 psi or less; Pressure Drop: 2.0 in. WC
(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”
101 71 60 51 47 43 38 33 31 28 26 25 24 22 20 17 15 14 13 12 12 11
PGP-8 1/2”
234 172 143 123 110 101 90 82 75 70 65 62 59 53 49 43 38 36 34 31 29 28
PGP-12 3/4”
449 339 279 242 217 200 173 156 143 133 124 117 111 101 92 79 71 66 60 57 54 51
PGP-16 1”
1246 873 708 610 545 496 428 382 347 321 300 282 268 239 217 187 167 152 141 131 123 117
PGP-20 1-1/4”
2006 1442 1189 1037 933 855 746 671 615 571 536 507 482 434 398 347 312 286 266 249 236 224
PGP-32 2"
6222 4449 3656 3181 2855 2614 2274 2041 1869 1734 1626 1536 1459 1310 1199 1043 936 857 796 746 704 669
Table 5*
Maximum Flow Capacity of Parker Parflex Tubing in Cubic Feet per Hour
Gas Pressure: 0.5 psi or less; Pressure Drop: 3.0 in. WC
(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”
132 92 75 64 57 52 45 40 36 33 31 29 28 25 23 19 17 16 14 14 13 13
PGP-8 1/2”
308 219 179 155 139 127 110 99 90 84 78 74 70 63 57 50 45 41 39 35 33 32
PGP-12 3/4”
500 412 340 296 266 244 212 191 175 162 152 144 137 123 113 98 88 81 75 70 67 63
PGP-16 1”
1500 1046 847 729 649 591 509 453 412 380 355 334 316 281 256 220 196 178 165 154 144 137
PGP-20 1-1/4”
2432 1749 1442 1258 1131 1037 904 813 746 693 650 615 585 526 482 420 378 347 322 302 286 272
PGP-32 2"
7571 5413 4449 3870 3453 3181 2767 2484 2274 2111 1978 1869 1776 1594 1459 1270 1140 1043 968 908 857 815
Table 6*
Maximum Flow Capacity of Parker Parflex Tubing in Cubic Feet per Hour
Gas Pressure: 0.5 psi or less; Pressure Drop: 4.0 in. WC
(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”
148 103 84 72 64 58 50 44 40 37 35 32 31 28 25 21 19 18 16 15 14 13
PGP-8 1/2”
345 246 201 175 157 143 124 112 102 95 88 84 79 71 65 57 51 46 44 40 38 36
PGP-12 3/4”
601 465 383 333 299 273 238 214 195 181 170 161 153 137 126 109 98 90 83 78 74 70
PGP-16 1”
1714 1199 972 838 747 680 586 523 476 439 410 386 366 326 297 255 228 207 192 179 168 159
PGP-20 1-1/4”
2789 2006 1654 1442 1279 1189 1037 933 855 795 746 705 671 603 553 482 434 398 369 347 328 312
PGP-32 2"
8702 6222 5113 4449 3993 3656 3181 2855 2614 2426 2274 2148 2041 1832 1677 1459 1310 1199 1113 1043 985 936
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