Samson 3321 - Page 29

EB 8111/8112 EN 29
Mounting and start-up
Table4: Inlet and outlet lengths
Q
a x DN b x DN
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