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Series
2.15
INSTRUCTIONS
November 2013
Page
ISO
G
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
USER'S MANUAL – AHLSTAR
Installation at the site
Piping for degassing in a liquid ring pump (-LM, -S)
Connect the degassing piping to the degassing connection (C50.21) of the pump. The degassing connection of the -
LM design liquid ring pump is on the right-hand side when seen from the drive. The degassing connection of the -S
design liquid ring pump can be either on the right or left side of the pump. The precise size and direction of the
connection are shown in the dimensional drawing.
W A R N I N G
Some of the pumped liquid will run out of the degassing connection during pumping. Lead and handle
this liquid appropriately.
The mixture of gas and liquid discharging from the degassing connection is normally led back into the process by
taking the degassing pipe underneath the liquid level, see examples in Figures 8, 9 and 10.
The suitable pipe size for the degassing piping is determined on the basis of pipe length, clogging risk etc. Normally,
the suitable pipe size is one corresponding to the size of the degassing connection or the following larger size.
A vacuum relief valve and a pressure indicator, connected to the connection (C34.21) opposite the degassing
connection, are usually included in the degassing piping.
Starting with a straight suction pipe
Fig. 8
Closed valve on startup
Volume 1
Volume 2
Either external water or return circulation
Degassing pipe
Vacuum relief valve
Pressure indicator