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)
Mar 29, 2015
Water Sizing
Plumbing Systems
CNST 305 Environmental Systems 1Dr. 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)
Steps to sizing
Isometric Diagram
30o
Assign WSFU Water Supply Fixture Unit (WSFU)
• • •
Use Table 2-2 (Wentz) for WSFU assignment…pp 7-12 See note 3 (fine print on bottom)
2 WSFU x .75 = 1.5
5 WSFU
10 WSFU1 ¼” spud
Add Up All WSFU
1.5 WSFU
1.5 WSFU
1.5 WSFU
1.5 WSFU
5 WSFU
5 WSFU
10 WSFU
10 WSFU
3 WSFU
8 WSFU
13 WSFU
23 WSFU
33 WSFU
3 WSFU
21 WSFU
110 WSFU
24 WSFU
143 WSFU
Convert to GPM
5 GPM
14.6 GPM
16.4 GPM
5 GPM
3.5 GPM for each
10 GPM
29.4 GPM
36.8 GPM42.7 GPM
78.3 GPM
70 GPM
7 GPM
7 GPM
27 GPM
27 GPM
Hunter CurvesPredominantly Flushometer
Predominantly Flush Tank
Select Chart and Size
Note:
•Use copper pipe
•Use minimum size from tbl 2.2 for individual fixture pipe
½”
½”½”
½”
¾”
¾”
1”
1”
1 ¼” spud
Predominantly Flushometers for Smooth Copper Pipe
5 gpm10 gpm
42.7 gpm
29.4 gpm36.8 gpm
70 gpm78.3 gpm
Notes:
• 5-10 fps
• 2-7 psi/100’
¾”1”
1½”1½”
2”2”
2 ½”
Class Exercise You size the hot water piping Does the hot water side use
flushometers? Use predominately flush tanks
Check
1 ¼”
¾”
1”
¾”
1”
1 ½”
1 ½” 2”
2 ½”
2”
½”
½”½”
½”
¾”
¾”
1”
1”
• 5-10 fps
• 2-7 psi/100’
•Pressure at last fixture
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
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 8.4 - 8.5 (Toa)