2012-02-28_REVISION - M1980244 ‎(70)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL 5, Appendix C: Design Calculations
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

PROJECT:
Squaw Gulch VLF
, EATURE:
Riser Pipe Design
DETAILS:
Screen Length
• Analysis:
Roscoe Moss Shutter Screen dimensions:
- 24 inch diameter
- 84 sots / foot
- 55 in / foot
Flow capacity = 4.8 * (Ap * 12 * Don)
Ap = Open area ( %)
Do = Outside diameter (inches)
JOB NO:
112%
BY:
OV
CHKD BY:
DTW
• Criteria: 1) Screen length for riser pipes based on Roscoe -Moss Shutter Screen, Stainless Steel - Standard How.
Surface area of blank casing = 2nR * L
A= 2n* 12 *12= 904.78 in /ft
% Open area = (55 in /ft) / (904.78 in /ft) = 0.0608 = 0.06 = 6%
Flow capacity = 4.8 * (0,06 * 12 * 24 * n) = 261 gpm / ft
Required riser flow:
Maximum flow from 3 risers = 17,000 gpm / 3 = 5,667 gpm
Minimum screen length: (5,667 gpm) / (261 gpm /ft) : 18.4 ft = 21.7 feet
SHEET 2 OF 7
DATE:
08/03/2010
DATE:
08/03/2010