32
EB 8052 EN
Mounting and start-up
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
Î
Locate the vent plug on the opposite side
to the workplace of operating personnel.
Î
On mounting valve accessories, make
sure that they can be operated from the
workplace of the operating personnel.
The workplace of operating personnel is the
location from which the valve, actuator, and
any mounted valve accessories can be ac
-
cessed to operate them.
Note
Table 5:
Inlet and outlet lengths
Q
a x NPS
b x NPS
State of process
medium
Valve conditions
Inlet length
a
Outlet length
b
Gas
Ma ≤ 0.3
2
4
0.3 ≤ Ma ≤ 0.7
2
10
Vapor
Ma ≤ 0.3
1)
2
4
0.3 ≤ Ma ≤ 0.7
1)
2
10
Saturated steam (percentage of condensate
> 5 %)
2
20
Liquid
Free of cavitation/w < 10 m/s
2
4
Cavitation producing noise/w ≤ 3 m/s
2
4
Cavitation producing noise/3 < w < 5 m/s
2
10
Critical cavitation/w ≤ 3 m/s
2
10
Critical cavitation/3 < w < 5 m/s
2
20
Flashing
–
2
20
Multi-phase
–
10
20
1)
No saturated steam
Q
Flow rate
a
Inlet length
b
Outlet length
Summary of Contents for 3251
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