Book - School of Science and Technology

604 Piping design for central hot water supply systemsTable 21.5 Pressure in kPa and head of water in m at 10 CHead(m) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90 0 0.98 1.96 2.94 3.92 4.90 5.88 6.86 7.84 8.821 9.8 10.8 11.8 12.7 13.7 14.7 15.7 16.7 17.6 18.62 19.6 20.6 21.6 22.5 23.5 24.5 25.5 26.5 27.4 28.43 29.4 30.4 31.4 32.4 33.3 34.3 35.3 36.3 37.3 38.24 39.2 40.2 41.2 42.2 43.1 44.1 45.1 46.1 47.1 48.05 49.0 50.0 51.0 52.0 52.9 53.9 54.9 55.9 56.9 57.86 58.8 59.8 60.8 61.8 62.7 63.7 64.7 65.7 66.7 67.77 68.6 69.6 70.6 71.6 72.5 73.5 74.5 75.5 76.5 77.48 78.4 79.4 80.4 81.4 82.4 83.3 84.3 85.3 86.3 87.39 88.2 89.2 90.2 91.2 92.2 93.1 94.1 95.1 96.1 97.1Similarly, flow to fittings such as wash fountains and washing machines which mayrequire a specific pattern of supply must be dealt with separately according to type andthe makers' flow requirements.It cannot be over-emphasised that a method such as that noted above is a statisticalapproach to a human problem and is therefore no more than a useful indication of a routeto follow in design. There is no substitute for either a broad experience or a specificknowledge of the pattern of use in other similar applications.Cold feedKitchen2 sinksFloor 4Floor 3Floor 2Floor 1OFRisersX Y ZOAOBOCOE OD5 basins2 baths6 basins3 baths1 shower6 basins4 baths1 shower8 basins5 baths2 showerOGRisers X & Y supplydraw off points asfor riser ZFigure 21.5 Pipe sizing example: outflow fittings served