Goulds Pumps 3501 Mixer - IOM - Manual (Page 22)

PIPING
GENERAL
p
! WARNING
Never draw piping into place by forcing at the flanged
connections of the mixer. This may impose dangerous
strains on the unit and cause misalignment between
mixer and driver. Pipe strain will adversely effect the
operation of the mixer resulting in physical injury and
damage to the equipment.
p
! WARNING
These mixers are commonly used in high temperature
applications (>150°F). Due to thermal expansion in
these services, special precautions must be taken to
insure that flange loads do not exceed the limits of the
mixer. Contact your Goulds representative for
information on the maximum flange loads.
1. All piping must be supported independently of, and
line up naturally with, the mixer flanges.
2. Piping runs should be as short as possible to
minimize friction losses.
3. DO NOT connect piping to mixer until grout has
hardened and mixer and driver hold-down bolts have
been tightened.
4. It is suggested that expansion loops or joints be
properly installed in inlet and/or outlet lines when
handling liquids at elevated temperatures, so linear
expansion of piping will not draw mixer out of
alignment.
5. The piping should be arranged to allow mixer
flushing prior to removal of the unit on services
handling corrosive liquids.
6. Carefully clean all pipe parts, valves and fittings, and
mixer branches prior to assembly.
INLET PIPING
Properly installed inlet piping is a necessity for
trouble-free mixer operation. Inlet piping should be
flushed BEFORE connection to the mixer.
1. Use of elbows close to the mixer inlet flange should
be avoided. There should be a minimum of two (2)
pipe diameters of straight pipe between the elbow
and inlet. Where used, elbows should be long radius.
2. Use pipe one or two sizes larger than the mixer inlet,
with a reducer before the chemical feed location.
Piping should never be of smaller diameter than the
mixer inlet.
3. Reducers, if used, should be abrupt stepped designs,
not tapered.
4. An isolation valve should be installed in the inlet line
at least four (4) pipe diameters from the inlet to
permit closing of the line for mixer inspection and
maintenance.
5. Keep inlet pipe free from air pockets.
6. Piping should be level or slope gradually downward
from the source of supply.
OUTLET PIPING
1. Isolation valves should be installed in outlet line.
The isolation valve is required for inspection and
maintenance of mixer.
FINAL PIPING CHECK
After connecting the piping to mixer:
1. Rotate shaft several times by hand to be sure that
there is no binding and all parts are free.
2. Check alignment, per the alignment procedure
outlined previously to determine absence of pipe
strain. If pipe strain exists, correct piping.
PIPING INSTRUCTIONS
LIQUID MIXING
Pipe
·
Material selection is based upon the chemicals
mixed and their temperatures.
·
There are no special requirements for increasers,
elbows or other fittings after the mixer.
Chemical Injection Pipe
·
Is two (2’) feet long and the same size and material
as the mixer.
·
Is part of the mixer design package.
18 3501 IOM 11/10