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Effective November 1, 2000
TEST PROCEDURES:
When performing operational testing, it is
recommended that the casing be allowed to stand full of water or the
test fluid for at least 48 hours prior to starting the test to allow
the Simsite® Composite Material to expand. This will allow the
required wet clearances to be achieved for the operational test to be
accurate.
BALANCING THE ROTATING ASSEMBLY:
Simsite® Impellers and pump components are precision machined to
assure dynamic
balance, hydraulic balance and optimal performance. The dynamic
balancing of Simsite® products by weight adjustment (i.e. adding
balancing weights such as set screws) is usually not necessary and may
be harmful to the integrity of the components if done improperly.
WARNING
DYNAMIC BALANCE BY GRINDING OFF MATERIAL MUST NEVER BE DONE ON
SIMSITE® COMPONENTS
Although there is no need to balance Simsite® Impellers, if you wish
to check the balance or if it is required, you must check the
impellers independently from the complete rotating element. The
standards by which Simsite® Impellers are balanced differs from
metallic impellers because of the light weight of the composite.
Therefore, there shall be no weight
adjustment made to a Simsite Impeller of 2 grams or less.
If an adjustment needs to be made DO NOT GRIND ON THE SIMSITE®
IMPELLER. Make an adjustment for balance on one of the metallic
parts or add weight to the Simsite Impeller (Similar to balancing art
automobile tire) by drilling and tapping set screws into the impeller
(see Balancing Instructions) and covering them over completely with
Simsite molecular compound.
BALANCING INSTRUCTIONS - SIMSITE ® IMPELLERS:
Simsite® impellers and pump components are very light weight and are
precision machined to assure dynamic balance, hydraulic
balance, and optimal performance. The dynamic balancing of Sims
Impellers and composite products by weight adjustment (grinding off
material is not allowed and may be harmful to the integrity of the
composite.) is not necessary, but
if it is necessary may only be performed by drilling and tapping set
screws into the impeller (see Balancing Instructions) and covering
them over completely with Simsite® molecular compound.
Although there is no need to balance Simsite® Impellers, if you wish
to check the balance or if it is required, you must check the
impellers independently from the complete rotating element. The
standards by which Simsite® Impellers are balanced differs from
metallic impellers because of the light weight of the composite.
Therefore, there shall be no weight adjustment
made to a Simsite Impeller of 2 grams or less.
BALANCE PROCEDURE FOR SIMSITE® IMPELLERS:
Assuming that the driver and shaft is initially balanced, little or no
impact should occur upon the addition of a Simsite® Composite
Impeller. It should not be necessary to rebalance the Simsite®
Composite Impellers. Simsite® Impellers are precision machined and
dynamically balanced at the Sims Factory. If imbalance is evident
during operation, attempt to locate the source of imbalance and make
the necessary adjustments to the metallic components of the
rotating assembly.
Dynamic balancing of rotating assemblies utilizing Simsite® composite
components requires special consideration and procedures. Because of
the Simsite® composite component’s light weight relative to metallic
components, and because of the matrix construction of the Simsite®
material, grinding is not permitted and may be harmful to
the integrity of the composite component. All weight adjustments
should be made by grinding on the metallic components of the rotating
element.
note: Where dynamic
balancing is required, the necessary weight adjustments shall only be
made to the metallic components of the rotating assembly.
DRILLING & TAPPING
FOR SET SCREWS IN SIMSITE® COMPOSITE IMPELLERS:
If necessary, Simsite® Impellers can be balanced by adding weight to
the impeller. (Similar to the balancing of an automobile tire except
that the weight should be countersunk into the impeller). The
recommended weight that has to be added to the impeller for balance
should be either a monel or stainless steel set screw (8-32, 10-32, or
1/4-20). The impeller should be drilled and tapped to accept the set
screws either in the side of the “wear ring area” or in the
“shroud of the impeller in the middle of one or more of the vanes.
The set screws should be screwed in with loctite® (or equal) and
covered with a molecular compound (Belzona, Devcon, Simsite®, etc.) to
cover the screw.
1.) Secure impeller with clamps, studs, nuts, etc. (Do not put
excessive stress on the composite impeller.)
2.) Secure center drill in chuck. Drill impeller. (Do not move
impeller between operations.)
3.) Secure drill in chuck and drill to the proper depth. (Drill deep
enough to slightly countersink the set screw you are adding for
balance.) Clean chips from hole.
4.) Secure tap in chuck of a tapping machine or tap by hand
rotating the tap slowly. (Do not use excessive force when tapping.)
Tap hole clearing the chips periodically from the hole.
5.) Secure bottom tap in the chuck. Follow the same procedure as
number 4.
6.) Screw in the stainless steel or monel set screws with glue
or loctite® (Do not over tighten.)
7.) If the set screws need to be cut, then cut and grind the edges of
the screws before screwing them into the composite.
8.) The set screws must be countersunk into the composite and
covered with Sims Molecular Compound.
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