Emerson PENBERTHY Installation, Operation And Maintenance Instructions page 3

PENBERTHY MODEL TME MIXER
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4.1 Mounting
A TME can be mounted in any position. The
supply line and manifold piping to multiple TMEs
must be sized to supply uniform pressure to
each TME.
It is important that the TME be positioned within
the tank so as to insure the free flow of liquid
to be mixed into and out of the unit(s). The
greatest agitation occurs within the discharge
plume; therefore, the discharge end should
be aimed towards the most remote part of the
tank. On the other hand, the intake end of the
unit must be far enough from the tank corner
or wall to allow the free flow of liquid into the
suction openings.
Tank shape and size influence the placement
and number of TMEs required to maintain even
agitation or temperature distribution. With a
spherical tank, a single TME mounted as shown
in Figure 2 makes the best use of the mixing
characteristics of the TME. With no corners to
impede liquid flow, the liquid circulates evenly.
In a cylindrical, square or rectangular tank, the
angular intersection of surfaces can interrupt
liquid flow patterns and cause liquid stagnation
in these areas. A single TME mounted as shown
in Figure 3 will minimize this. Whenever the ratio
of length to diameter of the tank is greater than
2:1 (such as tank trucks or railroad cars), it is
recommended that multiple TMEs be used.
In tanks where a critical velocity must be
maintained on the tank bottom, a slight downward
angle of the TMEs can be helpful. (See Figure 4).
4.2 Effect of related piping and precautions
1. For mixing
a. Operating liquid supply line pressure loss
must be taken into account when applying
TMEs.
b. The supply line must be clean and should
be provided with a strainer to prevent
foreign materials from clogging the
mixer.
c. TMEs must be fully submerged to prevent
liquid from splashing and drawing
atmospheric air and to promote maximum
mixing.
d. Clearance should be provided for removal
of the TME.
e. Provisions should be made for a pressure
gauge connection at or near the TME
inlet. It may become necessary to install
a pressure gauge if operating difficulties
are encountered.
f. Inlet piping must be secured to the tank
wall near the TME to keep strain off piping
when in operation.
g. Supply line and manifold piping must be
sized to supply adequate pressure equally
to each TME when multiple TMEs are used.
5 OPERATION
5.1 Pre-operational check
1. Ensure that all installation procedures have
been completed.
2. Fill the tank with sufficient liquid for full
submergence of the TME.
5.2 Operating
1. For mixing
a. Turn operating fluid flow on (depending
upon the application, this may be liquid
drawn from the tank or it can be a second
liquid drawn from another source).
6 MAINTENANCE
Maintenance should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and thoroughly
understand all the instructions in this manual.
CAUTION
Do not proceed with any maintenance unless the
TME has been relieved of all pressure or vacuum,
has been allowed to reach ambient temperature
and has been drained or purged of all fluids.
Failure to follow these instructions may cause a
sudden release of pressure resulting in personal
injury or property damage.
6.1 Preventative maintenance
The user must create maintenance schedules,
safety manuals and inspection details for each
specific installation of a TME Mixer.
On all installations, the following items should
be regularly evaluated by the user for purposes
of maintenance:
1. TME(s) for pitting or debris build up.
2. Piping and fittings for corrosion or debris
build up.
3. All connections for tightness.
4. Units for wear.
5. Units for full submergence.
The user must determine an appropriate
maintenance schedule necessary for his or
her own specific application, upon evaluation
of their operating experience. Realistic
maintenance schedules can only be determined
with full knowledge of the services and
application situation involved.
Spherical
FIGURE 2
Supply
FIGURE 3
Supply
FIGURE 4
3