model of pump or first pump produced for this contract.][ Conduct this
test using either a scale model of each size of pump or one of each size of
pump produced for this contract.] Cavitation testing shall be performed in
accordance with HI 2.6 if no published NPSHR curves are available.]
[The performance and cavitation limits of the proposed pump[ and the shape
of the discharge water passage] shall be determined by a series of tests
made on a scale model of the pump[ and discharge water passage]. The model
test shall be completed within [180][240] days after date of notice to
proceed.]
2.5.3.2
Test Setup
**************************************************************************
NOTE: Select appropriate alternate paragraph.
First paragraph, Alternate 1; second paragraph,
Alternate 2.
If a FSI is used which does not use the
dimensions/ratios as furnished by the Government, a
complete pump should be tested.
**************************************************************************
[a.
Model Pump - Model pump, if used, shall be homologous to the
proposed prototype pump, shall be installed with shaft in vertical
position, and shall have an impeller inlet diameter of not less
than 275 mm 11 inches.. Model test shall be completed within
[150][180] days after date of notice of award. Include a model of
[[sump][ including sump closure gate][ and discharge water
passage]][[manufacturer's standard sump][ and discharge water
passage]].[ A model of the formed suction intake (FSI) specified
shall be installed on model pump that is tested.]]
[a.
Model Pump - The model pump shall be homologous to the proposed
prototype pump, and mounted with the shaft in the vertical
position.[ The sump where the pump suction occurs shall be
equipped with windows strategically located for viewing those
areas where separation is likely to occur. Windows may be rings
of transparent material approximately 100 to 125 mm 4 to 5 inches
wide securely anchored between flanges.] The impeller inlet
diameter and the datum for this test specification shall be as
indicated on Figure 3 at the end of this section. The inlet
diameter shall be not less than 275 mm 11 inches.[ If a formed
suction intake (FSI) is specified for the pump, the complete FSI,
including the [gate][bulkhead] slot, shall be included in the
model test.] The FSI used in the model test shall be
geometrically the same as that used for the proposed pump.]
**************************************************************************
NOTE: Delete paragraph b. if Alternate 2, above, is
selected.
**************************************************************************
[b.
Prototype Pump(s) - Prototype (first pump built) pump(s) if
selected, shall be set with shaft in vertical position. Factory
test elbow may be used in lieu of the prototype elbow for testing
purposes, providing test results are adjusted to reflect the
difference in losses. Tests shall be completed prior to
assembling any pump except the [one][ones] to be tested. (FSI
SECTION 15131A
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