WATSON MARLOW
Chemical metering
At a water treatment plant, influent is received through
several very long pipelines. After preliminary processing,
the influent goes through a scrub-down to reduce
hydrogen sulfide content from as much as 250 ppm to less
than 0.1 ppm. Diaphragm and PC pumps were replaced
after experiencing long downtimes, high maintenance
costs and poor performance. Bredel hose pumps are
used in this process to transfer and meter sodium
hypochlorite, sodium hydroxide, and sodium bisulphate.
Dimensions
Note: measurements in inches
How to use the curves
1. Flow required indicates pump speed
2. Calculated discharge pressure
3. Net motor power required
4. Product temperature
5. Calculated discharge pressure
6. Maximum recommended pump speed
Note: The area of continuous operation
diminishes with increased product
temperatures. For product temperatures
>104F, the area of continuous operation
reduces to the corresponding red
temperature line.
K
J
M
O
N
H1
H
C
D
A1
ØE
ØE
A
H2
L
B
F
G
L2
L1
4x ØP
Type
A
A1
B
C
D
E
F
G
H1
H2
max
J
K
L
max
L1
L2
max
M
N
O
P
Bredel 10
13.27
12.24
6.73
2.44
4.57
Ø0.63
9.25
10.43
5
12.56
3.07
2
20.55
1.81
13.94
5.9
2.56
0.98
Ø0.47
Bredel 15
16.81
16.97
9.05
2.48
7.68
Ø0.79
11.22
11.97
6.57 14.13
3.23
2.4
20.71
1.81
15.67
5.9
2.95
0.98
Ø0.47
Bredel 20
16.81
16.97
9.05
2.48
7.68
Ø0.98
11.22
11.97
6.57 14.13
3.23
2.4
20.71
1.81
15.67
5.9
2.95
0.98
Ø0.47
5