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 FIGURE 4-5. Double-Register Compound Meter
TABLE 4-3. Compound Meter Operating Characteristics
Maximum
Allowable
Loss
Normal
of
Head
at
Maxi
mum
Test
Safe
Maximum
Rate
for
Safe Maximum
Flow
Minimum
Operating
Operating
Continuous
Meter
Limits
Test
Flows
Capacity
Duty
Size
Capacity
(
p
s
i
)
(9pm)
(
9
p
m
)
(inches)
(9pm)
2
-
1
6
0
1
/
4
20
160
80
2
4
-
3
2
0
1
/
2
20
320
160
3
6
-
5
0
0
3
/
4
20
500
250
4
1-1/2
10-1,000
20
1,000
500
6
16-1,600
2
20
8
1,600
800
32-2,300
4
10
20
2,300
1,150
4-9
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