Samson 3321CT, Монтаж и эксплуатация, Страница: 27 / 80

EB 8115 EN 5-1
Installation
5 Installation
The work described in this section is only to
be performed by personnel appropriately
qualified 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 rec
-
ommendations. Contact SAMSON if the
lengths are significantly shorter than the rec-
ommended lengths.
To ensure that the valve functions properly,
proceed as follows:
Table 5-1: Inlet and outlet lengths
a x NPS b x NPS
a x DN b x DN
Q
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
Wet 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
1)
No wet steam
Q Flow rate
a Inlet length
b Outlet length