Installation Guide

Sizing/Capacity Tables

Equivalent Hydraulic Diameter (EHD): A theoretical sizing which is used to compare the

hydraulic performance between manufacturers. A higher EHD number indicates greater

ow capacity of piping.

Tables include losses for four 90 degree bends and two (2) end ttings. Tubing runs with

larger numbers of bends and/or tting shall be increased by an equivalent length of tubing

according to the following formula: L = 1.3 x (n) where L is the additional length of tubing

necessary and n is the number of additional ttings and/or bends.

Table 7.7 Propane Low Pressure (11 in w.c. with 0.5 in drop)

Maximum Capacity of HOME-FLEX® CSST in thousands of BTU (KBTU) per Hour of House Propane Gas (Approximate 2520 BTU per Cubic Foot CFH)

Minimum Gas Pressure: 11 in w.c. Pressure Drop: 0.5 in w.c. (Based on a 1.52 specic gravity of gas)

Tube Size EHD

Tubing Length (ft)

5 10 15 20 25 30 40 50 60 70 75 80 90 100 125 150 200 300 400 500

½" 18 150 108 90 78 70 65 56 51 47 43 42 41 39 37 33 30 26 22 19 17

¾" 25 447 316 258 223 200 182 158 141 129 119 115 112 105 100 89 82 71 58 50 45

1" 31 990 672 535 455 402 363 309 273 246 226 217 210 196 185 163 147 125 100 85 75

Table 7.8 Propane Medium Pressure (13 - 14 in w.c. with 2.5 in drop)

Maximum Capacity of HOME-FLEX® CSST in thousands of BTU (KBTU) per Hour of House Propane Gas (Approximate 2520 BTU per Cubic Foot CFH)

Minimum Gas Pressure: 13 - 14 in w.c. Pressure Drop: 2.5 in w.c. (Based on a 1.52 specic gravity of gas)

Tube Size EHD

Tubing Length (ft)

5 10 15 20 25 30 40 50 60 70 75 80 90 100 125 150 200 300 400 500

½" 18 322 232 192 168 151 139 121 109 100 93 90 87 83 79 71 65 57 47 41 37

¾" 25 1000 712 584 507 454 416 361 324 296 274 265 257 243 230 207 189 164 134 117 105

1" 31 2449 1661 1324 1127 994 898 764 675 609 559 537 518 485 458 404 365 310 247 211 186