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D-160TS-7-E
8
No.
Remark
1
Reducer
A concentric reducer is installed at
the upstream of a meter.
2
Elbow
An elbow is installed at the
upstream of a meter.
Two elbows are installed at the
upstream of a meter.
Two elbows are vertically installed
at the upstream of a meter.
3
Fully open
gate valve
A full-open gate valve is installed at
the upstream of a meter.
4
Partially open
gate valve
A partially open gate valve, sharp
orifice or something that markedly
disturbs the flow pattern is
upstream of meter.
6. PIPING INSTRUCTIONS
6.1 Standard Piping Conditions
It is generally required that the flow pattern of a material moving into an inferential type meter be as
uniform as possible for accurate metering. Accordingly, proper flow straightening measures must be
taken when installing the OVAL VORTEX FLOWMETER. In applications where OVAL straightening devices
(flow straightener, Honey vane, and downstream pipe) are used, a straight pipe section is not required
unless otherwise specified. However, if using only the straight pipe section without other flow straightening
devices, secure the length of a straight pipe conforming to the ISO standards given the table below:
(
1
)
OVAL flow straightener combined with downstream pipe
D: Nom. dia.
1
Honey vane L
Flow straightener
2
8D
Flow
12D
Flow
(
2
)
Straight pipe alone without flow straightener
Length of straight pipe section recommended by ISO-5167
15D Min.
Flow
No.
23D Min.
Flow
25D Min.
Flow
40D Min.
Flow
15D Min.
Flow
Fully Open
50D Min.
Flow
Partially Open
A short pipe section, 5D or longer shall be provided downstream of the meter.
D: Nom. dia.
CAUTION: