Big Book of Hamworthy Products and Services

95 01202 662500 | sales@hamworthy-heating.com | hamworthy-heating.com Schematics & System Design Gas supply pipes The data in this table shows pipe lengths from gas meter outlet to appliance, which will produce approx. 1 mbar pressure loss. This table must be used in conjunction with the losses of various fittings shown in the table opposite. This information is provided for guidance only and does not replace the requirement for full and accurate pipe sizing, to suit the site layout and appliances in use. Supply pipes must be fitted in accordance with BS6891 or IGE/UP/2 as appropriate. Pipe work must be of adequate size. Pipes should not be of a smaller size than the appliance gas connection. Gas flow in pipes - natural gas (G20) Appliance Gas Maximum length of gas pipe (metres) Input kW 80% Eff. Volume m 3 /h 20mm 25mm 32mm 40mm 50mm 65mm 80mm 100mm 125mm 150mm 3 /4” 1” 1 1 /4” 1 1 /2” 2” 2 1 /2” 3” 4” 5” 6” 50.0 4.65 13 40 145 - - - - - - - 62.5 5.81 9 27 99 200 - - - - - - 75.0 6.97 6 19 71 154 - - - - - - 87.5 8.13 - 15 56 91 - - - - - - 100.0 9.29 - 12 43 80 - - - - - - 118.8 11.03 - - 33 69 250 - - - - - 125.0 11.61 - - 29 61 182 - - - - - 131.3 12.19 - - 28 56 172 - - - - - 150.0 13.94 - - 22 44 141 - - - - - 175.0 16.26 - - - 34 105 - - - - - 187.5 17.42 - - - 30 95 - - - - - 200.0 18.58 - - - 27 83 - - - - - 225.0 20.90 - - - 22 67 238 - - - - 237.5 22.06 - - - 20 66 217 - - - - 250.0 23.23 - - - 18 58 196 - - - - 262.5 24.39 - - - - 53 182 - - - - 300.0 27.87 - - - - 42 143 - - - - 312.5 29.03 - - - - 40 133 - - - - 350.0 32.52 - - - - 31 110 - - - - 356.3 33.10 - - - - 29 109 - - - - 375.0 34.84 - - - - 27 88 - - - - 393.8 36.58 - - - - 25 71 - - - - 400.0 37.16 - - - - 24 70 189 - - - 437.5 40.64 - - - - 22 69 159 - - - 450.0 41.81 - - - - - 68 149 - - - 475.0 44.13 - - - - - 65 139 - - - 500.0 46.45 - - - - - 57 125 - - - 525.0 48.77 - - - - - 54 114 - - - 593.8 55.16 - - - - - 42 87 - - - 600.0 55.74 - - - - - 41 83 - - - 625.0 58.06 - - - - - 40 80 - - - 656.3 60.97 - - - - - 35 73 - - - 712.5 66.19 - - - - - 30 67 - - - 750.0 69.68 - - - - - 28 60 - - - 787.5 73.16 - - - - - 26 57 200 - - 900.0 83.61 - - - - - 20 44 156 - - 937.5 87.09 - - - - - 18 42 145 - - 968.8 90.00 - - - - - - 40 139 - - 1000.0 92.90 - - - - - - 37 133 403 - 1031.3 95.80 - - - - - - 35 125 364 - 1062.5 98.71 - - - - - - 32 118 333 - 1093.8 101.61 - - - - - - 31 111 308 - 1125.0 104.51 - - - - - - 29 105 286 - 1156.3 107.42 - - - - - - 28 100 267 435 1187.5 110.32 - - - - - - 26 93 263 417 1218.8 113.22 - - - - - - 25 86 250 400 1250.0 116.13 - - - - - - 24 81 238 385 1312.5 121.93 - - - - - - 22 76 222 357 1375.0 127.74 - - - - - - 21 71 200 333

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