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Water Sizing

3c. Water System. Chapter 8; Appendix B (Wentz) and 8.1-  8.3 (Toa). 4.11 Analysis and Design of Construction Systems - Mechanical (6 hrs). Water Sizing. Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman. Steps to sizing. Draw isometric diagram Assign WSFU

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Water Sizing

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  1. 3c Water System Chapter 8; Appendix B (Wentz) and 8.1-  8.3 (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (6 hrs) Water Sizing Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman

  2. Steps to sizing • Draw isometric diagram • Assign WSFU • Add all of WSFU units • Convert to gpm • Select Pipe Sizing chart • Select appropriate pressure drop • Cross check codes and available pressures at the last fixture

  3. Isometric Diagram 30o

  4. Assign WSFU 2 WSFU x .75 = 1.5 5 WSFU 10 WSFU 1 ¼” spud • Water Supply Fixture Unit (WSFU) • Based on a probability of usage • The volume of water used in a single operation of the plumbing fixture • The duration of a single use of a plumbing fixture • The average time between successive operations of the plumbing fixture • Public usage higher than Private • Use Table 2-2 (Wentz) for WSFU assignment…pp 7-12 • See note 3 (fine print on bottom)

  5. Add Up All WSFU 110 WSFU 21 WSFU 3 WSFU 1.5 WSFU 1.5 WSFU 8 WSFU 3 WSFU 1.5 WSFU 1.5 WSFU 13 WSFU 5 WSFU 23 WSFU 5 WSFU 33 WSFU 10 WSFU 143 WSFU 24 WSFU 10 WSFU

  6. 70 GPM 14.6 GPM 5 GPM 5 GPM 3.5 GPM for each 10 GPM 29.4 GPM 7 GPM 36.8 GPM 7 GPM 42.7 GPM Hunter Curves Predominantly Flushometer Predominantly Flush Tank 16.4 GPM 27 GPM 78.3 GPM 27 GPM Convert to GPM

  7. ½” ½” ½” ½” ¾” ¾” 1” 1” Select Chart and Size 1 ¼” spud • Note: • Use copper pipe • Use minimum size from tbl 2.2 for individual fixture pipe

  8. 78.3 gpm 70 gpm 42.7 gpm 36.8 gpm 29.4 gpm 10 gpm 5 gpm Predominantly Flushometers for Smooth Copper Pipe 2 ½” 2” 2” 1½” 1½” 1” ¾” • Notes: • 5-10 fps • 2-7 psi/100’

  9. Class Exercise • You size the hot water piping • Does the hot water side use flushometers? • Use predominately flush tanks

  10. 2” 1” ½” ½” ½” ¾” ¾” ½” 1” ¾” 1 ½” ¾” 1 ½” 2” 1” 1 ¼” 1” 2 ½” Check • 5-10 fps • 2-7 psi/100’ • Pressure at last fixture

  11. Notable notes: • Booster pumps • Need for boost water pressure to overcome static head and friction • Sizing • (A) Available water pressure • (B) Pressure required at last fixture • (C) Static head losses • (D) Friction losses • Equivalent length • Pressure drop through backflow preventors, meter, water softeners, and filters • A – (B+C+D) = required boost

  12. 4abc Drain, Waste, Vent Chapter 2,5,6 Appendix C (Wentz) and  8.3 - 8.5 (Toa)    Next Time • Assignment #1 • Due Monday beginning of class • Problem 9 in Chapter 8 of Wentz, pp. 132 • Drain Waste Vents (DWV)

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