1. Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman
Water Sizing
Plumbing Systems
CNST 305
Environmental Systems 1
Dr. Berryman 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)

2. Steps to sizing

3. Isometric Diagram
30o

4. Assign WSFU Water Supply Fixture Unit (WSFU)
2 WSFU x .75 = 1.5
5 WSFU
Assign WSFU
10 WSFU
1 ¼” spud
Water Supply Fixture Unit (WSFU)
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

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

7. Select Chart and Size ½” ¾” Note: Use copper pipe1”
1 ¼” spud
Note:
Use copper pipe
Use minimum size from tbl 2.2 for individual fixture pipe

8. Predominantly Flushometers for Smooth Copper Pipe
42.7 gpm
29.4 gpm
36.8 gpm
70 gpm
78.3 gpm
2 ½” 2” 2”
1½”
1½”
5 gpm
10 gpm 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. Check 5-10 fps 2-7 psi/100’ Pressure at last fixture 1” ½” ¾” 1 ½” 2”
1 ¼” ¾” 1”
1 ½” 2”
2 ½” ½”

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. Chapter 2,5,6 Appendix C (Wentz) and 8.4 - 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)
4abc
Drain, Waste, Vent
Chapter 2,5,6 Appendix C (Wentz) and  (Toa)