Owner's manual

7
To minimize viscous flow losses when handling vis-
cous liquids, it may be necessary to use suction
piping up to four times larger than the size of the
suction connection on the pump. If in doubt, con-
tact your nearest LMI Distributor to determine the
necessary pipe size.
General Piping Considerations
• Use extreme care in piping to plastic liquid
end pumps with rigid pipe such as PVC. If
excessive stresses or vibration is unavoid-
able, flexible connections are recom-
mended.
• Use piping materials that will resist corro-
sion by the liquid being pumped. Use care
in selecting materials to avoid galvanic cor-
rosion at pump liquid end connections.
• Use piping heavy enough to withstand
maximum pressures.
• Remove burrs, sharp edges, and debris
from inside piping. Blow out all pipe lines
before making final connections to pump.
• Because vapor in the liquid end will cause
inaccurate pump delivery, piping should be
sloped to prevent vapor pockets
• When pumping suspended solids (such as
slurries), install plugged crosses at all 90°
line turns to permit line cleaning without
dismantling piping.
• See Figure 4 for a typical recommended
pump installation scheme.
Figure 4. Typical Recommended Pump Installation Scheme