5 Installation at Site
25 of 72
Sewatec (60 Hz)
5.4.3 Vacuum balance line
NOTE
Where fluid has to be pumped out of a vessel under vacuum, installing a vacuum
balance line is recommended.
The following rules apply to vacuum balance lines:
▪
Minimum nominal line diameter: 0.98 inch [25 mm].
▪
The line extends above the highest permissible fluid level in the tank.
1
2
5
4
3
6
Fig. 5:
Vacuum balance line
1
Vessel under vacuum
2
Vacuum balance line
3
Shut-off element
4
Swing check valve
5
Main shut-off element
6
Vacuum-tight shut-off element
NOTE
An additional line fitted with a shut-off valve (from the pump discharge nozzle to
the balance line) facilitates venting of the pump before start-up.
5.5 Auxiliary connections
WARNING
Screw plugs subjected to pressure
Risk of injuries by parts flying off and escaping fluid!
▷
Never use screw plugs for releasing pressure from the pump casing.
▷
Always use a suitable venting device (e.g. vent valve).
The following auxiliary connections are available:
