Sundyne LMV-313, Instruction And Operation Manual

Page: 10 / 82

Instruction and Operation Manual
6
Seal Environmental Control System
A seal environmental control system may be
required depending upon the pump seal
arrangement and application.
Always maintain the pump seal environment as
detailed on the specification sheet that
accompanies each unit.
Note: For most applications, a standard
control system can be obtained from
the factory.
Note: Diffuser Cavity Vent must be vented to
atmospheric drain.
Ensure that the specified seal environmental
control system is properly installed and that the
ports are open (or plugged) as indicated in
Figure 1.
Note: Port 1 must always be open or routed
to flare so that it is free to drain.
Figure 1. Seal Housing Port Identification
Note: Port 5 is the highest point in a vertically mounted pump and should be used for start up venting
only.
Liquid Buffer System
For double liquid seals and tandem liquid seals,
A liquid buffer system is used. Introduce the
buffer liquid into port 7, which will flow through
the seal cavity, and out from port 2. Buffer flow should be 0.5 to 3 gpm (2 to 12
liters/min) with an inlet temperature of 60
o
to
120
o
F (16
o
to 49
o
C), and inlet pressure as
indicated on the pump specification sheet. The
liquid must be clean to 5 microns.
Mounting Vertical Units Without Stands
For all vertical units without stands, a mounting
base is recommended. The pump should be
mounted on a rigid foundation, secured in
position by one-inch diameter bolts. The bolts should be installed in the foundation as shown
on the installation drawing. The length of the
bolts should be sufficient to extend at least ½-
inch above the nut.