Installation; Installation Conditions - Samson 3351 Mounting And Operating Instructions

5 Installation

The work described in this section is to be
performed only by personnel appropriately
qualified to carry out such tasks.
Table 5-1: Inlet and outlet lengths
State of process
Valve conditions
medium
Ma ≤ 0.3
Gas
0.3 ≤ Ma ≤ 0.7
Ma ≤ 0.3
Vapor 0.3 ≤ Ma ≤ 0.7
Wet steam (percentage of condensate > 5 %)
Free of cavitation/w < 10 m/s
Cavitation producing noise/w ≤ 3 m/s
Liquid Cavitation producing noise/3 < w < 5 m/s
Critical cavitation/w ≤ 3 m/s
Critical cavitation/3 < w < 5 m/s
Flashing –
Multi-phase –
No wet steam
1)
EB 8039 EN
Q
a x NPS
a x DN
1)
1)

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
b x DN
Flow rate
Inlet length
Outlet length
Inlet length
a
2
2
2
2
2
2
2
2
2
2
2
10
Installation
Outlet length
b
4
10
4
10
20
4
4
10
10
20
20
20
5-1