Samson 3251-E - 5 Installation; Installation Conditions

EB 8052-E EN 5-1
Installation
5 Installation
The work described in this section is only to
be performed by personnel appropriately
qualied to carry out such tasks.
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
easily access the device from the work posi-
tion.
Pipeline routing
The inlet and outlet lengths (see Table 5-1)
vary depending on several variables and
process conditions and are intended as
recommendations. Contact SAMSON if the
lengths are signicantly shorter than the
recommended lengths.
Table 5-1: 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