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IM 1F5B2-01E
Connection of Reducing and Expanding Pipes and Their Straight Lengths
Reducer or expander pipe:
Ensure the upstream straight pipe length be 5D or more (for /HAC version is 10D),
and the downstream straight pipe length to be 5D or more for per reducer pipe.
Ensure the upstream straight pipe length be 10D or more (for /HAC version is 20D),
and the downstream straight pipe length be 5D or more for per expander pipe.
Flow
YEWFLO
5D or more
Reducer
5D or more
(/HAC version 10D)
Flow
YEWFLO
5D or more
Expander
10D or more
(/HAC version 20D)
Figure 4.1-2 Connection of Reducing and Expanding Pipes and Their Straight
Lengths
Bent pipe and straight pipe length:
Ensure the upstream straight pipe length to be 10D or more, and the downstream straight
pipe length be 5D or more for per bent pipe.
Flow
10D × N or more 5D or more
YEWFLO
Figure 4.1-3 Connection of Bent Pipe and Straight Lengths of Pipe
In case of pulsating pressure existing:
•When pulsating pressure caused by a pump exist, install the valve on the upstream of
the flowmeter.
Installation Example
P
Pump
Valve
Figure 4.1-4a Piping Where Pulsating Pressure Caused by a Pump
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