Preparation For Installation - Samson 3254 Mounting And Operating Instructions

Installation
Table 5-1: Inlet and outlet lengths
State of pro-
Valve conditions
cess medium
Ma ≤ 0.3
Gas
0.3 ≤ Ma ≤ 0.7
Ma ≤ 0.3
Vapor 0.3 ≤ Ma ≤ 0.7
Saturated 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 saturated steam
1)
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
Î Locate the vent plug on the opposite side
to the work position of operating person-
nel.
Valve accessories
Î During connection of valve accessories,
make sure that they are easily accessible
and can be operated safely from the
work position.
5-2
Q
a x DN
1)
1)
Q
a
b
b x DN

5.2 Preparation for installation

Before installation, make sure the following
conditions are met:
− The valve is clean.
− The valve and all valve accessories (in-
cluding piping) are not damaged.
− The valve data on the nameplate (type
designation, valve size, material, pres-
sure rating and temperature range)
match the plant conditions (size and
Flow rate
Inlet length
Outlet length
Inlet length Outlet length
a
2
2
2
2
2
2
2
2
2
2
2
10
EB 8060 EN
b
4
10
4
10
20
4
4
10
10
20
20
20