21
United Industries, Inc.
P.O. Box 58
Sterling, KS 67579
800-835-3272 • 620-278-3160
Fax 800-500-3115 • 620-278-3115
www.towerflo.com
Data presented here is the best available at the
time of publicaton. United Industries and/or its
representatives assume no liability for its use.
Form SWEEP:4/98
Basin Sweeper Piping
Series
TFH
DISCHARGE OPENINGS:
The sizing of holes in a basin sweeper piping system evolves from the decision of the
type
of DIS-
CHARGE openings to be used; either simple holes, sweeper-eductor nozzles, or a combination of those two types. Different
criteria must be used to determine the number of discharge holes and/or nozzles to be used for a given application, as follows:
HOLES ONLY:
The total open area of discharge line openings should be equal to or slightly greater than the total open area
of the discharge pipe size. Use the table or the formula below to determine the size and number of holes to be used.
NOZZLES ONLY:
The total number of nozzles will be the flow rate of the filter system divided by 5 gpm per nozzle.
COMBINATION OF NOZZLES & HOLES:
1) start with the filter flow rate.
2) determine the preliminary number of nozzles you want to use.
3) multiply that number of nozzles by 5gpm per nozzle.
4) subtract the outcome of 3) from the total flow rate of the filter system (this is the portion of the filter flow rate consumed by
nozzles; this number cannot exceed the filter's flow rate; if it does, return to the nozzle only instructions).
5) divide the remaining flow rate by 3 gpm to determine the number of
1/4"
holes to be used in conjunction with the nozzles.
SUCTION OPENINGS:
Irrespective of the
type
of discharge openings selected, the number and size of suction openings will
always
be
determined by the following: the total open area of suction line openings should be equal to or slightly greater than
125% of the total open area of the discharge pipe size.
1.5"
50
63
19
24
11
14
36
45
16
20
9
12
2"
68
85
31
39
18
23
61
77
27
34
16
20
2.5"
98
123
44
55
25
32
87
109
39
49
22
28
3"
•
•
67
84
38
48
•
•
60
75
34
43
4"
•
•
116
145
65
85
•
•
104
130
59
74
6"
•
•
•
•
148
185
•
•
•
•
133
167
8"
•
•
•
•
255
319
•
•
•
•
233
292
SCH 40
SCH 80
PIPE
# 1/4" holes
#3/8" holes
# 1/2" holes
# 1/4" holes
#3/8" holes
# 1/2" holes
SIZE DIS SUC DIS SUC DIS SUC DIS SUC DIS SUC DIS SUC
Suggested Number of Pipe Holes
Inside Diameter of Common Pipe Sizes
1.5"
2.0"
2.5"
3.0"
4.0"
6.0"
8.0"
Sch 40
1.610
2.067
2.469
3.068
4.026
6.065
7.981
Sch 80
1.500
1.939
2.323
2.900
3.826
5.761
7.625
TO CALCULATE NUMBER AND SIZE OF DISCHARGE AND SUCTION OPENINGS
Steps: 1 Calculate open area of selected discharge pipe size based on its inside diameter (π r
2);
2 Calculate open area of selected discharge hole size (π r
2);
3 Divide result of Step 1 by result of Step 2 to find number of holes in discharge piping (round up);
4 Multiply result of Step 3 by 1.25 to find number of suction holes (round up).
The calculated number of discharge openings should be spaced evenly around the discharge pipe run or across pipe runs
designed to influence specific areas. Suction holes should be spaced evenly around the suction header in the water basin or
reservoir. Common sense should always govern the selection of hole sizes, the resulting number of holes, and the placement of
those openings; keep the number of holes to be drilled to a practical, manageable number for the run of pipe.
The tables below will help you select the size and number of holes for most Series TF, TFD, TFD2, and TFH installations. The
Inside Diameter Table provides the information necessary for you to calculate hole sizes and number for other installations.
