length of piping is the developed length plus the equivalent lengths of pipe corresponding to friction head losses for fittings and valves. Where the size of fittings and valves is not known, the added friction head losses must be approximated. An estimate for this example is found in Table E.1. Step 8 Column 7: Add the figures from Column 4 and Column 6, and enter in Column 7. Express the sum in hundreds of feet. TABLE E.1 PRESSURE PRESSURE LOSS LOSS EXPRESSED EXPRESSED COLD AS HOT AS WATER EQUIVALENT WATER EQUIVALENT PIPE LENGTH OF PIPE OF TUBE SECTION FITTINGS/VALVES TUBE (feet) SECTION FITTINGS/VALVES (feet) 3-21/2″ Gate 3-21/2″ Gate 3 A-B 3 valves valves A-B 1-21/2″ Side 1-21/2″ Side 12 12 branch tee branch tee 1-21/2″ Straight 1-2″ Straight run 0.5 B-C 7 run tee tee B-C 1-2″ 90-degree ell 0.5 1-21/2″ Side 1-11/2″ Side C-F 12 C-F 7 branch tee branch tee 1-21/2″ 1-1/2″ 90-degree C-D 7 C-D 4 ell ell 1-21/2″ Side 1-11/2″ Side D-E 12 D-E 7 branch tee branch tee For SI: 1 foot = 304.8 mm, i inch = 25.4 mm. Step 9 Column 8: Select from Figure E103.3(3) the friction loss per 100 feet (30 480 mm) of pipe for the gallon-per-minute flow in a section (Column 3) and pipe size (Column 5). Maximum friction head loss per 100 feet is determined on the basis of total pressure available for friction head loss and the longest equivalent length of run. The selection is based on the gallon-per-minute demand, the uniform friction head loss, and the maximum design velocity. Where the size indicated by hydraulic table indicates a
length of piping is the developed length plus the equivalent lengths of pipe corresponding to friction head losses for fittings and valves. Where the size of fittings and valves is not known, the added friction head losses must be approximated. An estimate for this example is found in Table E.1. Step 8 Column 7: Add the figures from Column 4 and Column 6, and enter in Column 7. Express the sum in hundreds of feet. TABLE E.1 COLD WATER PIPE SECTION FITTINGS/VALVES PRESSURE LOSS EXPRESSED AS EQUIVALENT LENGTH OF TUBE (feet) HOT WATER PIPE SECTION FITTINGS/VALVES PRESSURE LOSS EXPRESSED AS EQUIVALENT OF TUBE (feet) A-B 3-21/2″ Gate valves 3 A-B 3-21/2″ Gate valves 3 1-21/2″ Side branch tee 12 1-21/2″ Side branch tee 12 B-C 1-21/2″ Straight run tee 0.5 B-C 1-2″ Straight run tee 7 1-2″ 90-degree ell 0.5 C-F 1-21/2″ Side branch tee 12 C-F 1-11/2″ Side branch tee 7 C-D 1-21/2″ ell 7 C-D 1-1/2″ 90-degree ell 4 D-E 1-21/2″ Side branch tee 12 D-E 1-11/2″ Side branch tee 7 For SI: 1 foot = 304.8 mm, i inch = 25.4 mm. Step 9 Column 8: Select from Figure E103.3(3) the friction loss per 100 feet (30 480 mm) of pipe for the gallon-per-minute flow in a section (Column 3) and pipe size (Column 5). Maximum friction head loss per 100 feet is determined on the basis of total pressure available for friction head loss and the longest equivalent length of run. The selection is based on the gallon-per-minute demand, the uniform friction head loss, and the maximum design velocity. Where the size indicated by hydraulic table indicates a
INTERNATIONAL_PLUMBING_CODE.docx