Samson 3241 - Installation; 5.1 Installation Conditions; 5.2 Preparation for Installation

EB 8015 EN 5-1
Installation
5 Installation
The work described in this chapter is to be
performed only 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
Table 5-1: Inlet and outlet lengths
Q
a x DN b x DN
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
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 wet steam
Q Flow rate
a Inlet length
b Outlet length