3.7.2 Inlet piping
Properly installed inlet piping is a necessity for trouble-free mixer operation. Inlet piping should be flush-
ed 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.
3.7.3 Outlet piping
Isolation valves should be installed in outlet line. The isolation valve is required for inspection and main-
tenance of mixer.
3.7.4 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.
3.8 Piping instructions
3.8.1 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.
Valves
•
Control valve is typically before the mixer.
•
If additional back pressure is required, the control valve may be after the mixer.
•
Shut off valves should be after the mixer.
3.8 Piping instructions
3501 Installation, Operation, and Maintenance Instructions
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