Samson 3351 - Installation; Installation Conditions

EB 8039 EN 5-1
Installation
5 Installation
The work described in this section 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
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
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