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5 Installation
The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
Table 5-1: Inlet and outlet lengths
State of process medium
Inlet
Outlet
Gas
Vapor
Liquid
Liquid, with
Liquid
flashing
Multi-phase
No saturated steam
1)
EB 8072 EN
Q
a x NPS
Valve conditions
Ma ≤ 0.3
0.3 ≤ Ma ≤ 0.7
Ma ≤ 0.3
1)
0.3 ≤ Ma ≤ 0.7
1)
Saturated steam (percentage of con-
densate > 5 %)
Free of cavitation/w < 10 m/s
Cavitation producing
noise/w ≤ 3 m/s
Cavitation producing
noise/3 < w < 5 m/s
Critical cavitation/w ≤ 3 m/s
Critical cavitation/3 < w < 5 m/s
–
–
5.1 Installation conditions
Work position
The work position for the control valve is the
front view looking onto the operating con-
trols (including valve accessories).
Plant operators must ensure that, after instal-
lation of the device, the operating personnel
can perform all necessary work safely and
Q
a
b
b x NPS
Inlet length a
Installation
Flow rate
Inlet length
Outlet length
Outlet length b
2
4
2
10
2
4
2
10
2
20
2
4
2
4
2
10
2
10
2
20
2
20
10
20
5-1
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