Operation Manual

4-2

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

Pump

Valve

Figure 4.1-4a Piping Where Pulsating Pressure Caused by a Pump