2.5.3.4
Pump Test
Test shall demonstrate that proposed pump complies with specified
performance. Pump shall be capable of operation without instability over
entire range of heads specified in paragraph CAPACITIES. Instability is
defined, for this specification, as when one or more of the following
conditions occur:
a.
Pump has two or more flow rates at the same total head;
b.
Head-capacity curve has a dip (region on curve where change in
flow rate produces an abnormally low head);
c.
When any point in usable range of head-capacity curve cannot be
repeated within 3 percent.
Rerun test if this occurs. Compliance with specifications will be
determined from curves required by paragraph TEST RESULTS. Test
procedures, except as specified, shall be in accordance with applicable
provisions of HI 2.6. Temperature of water used for testing shall be
approximately the same for all tests run and shall be recorded during test
runs.
2.5.3.5
Test Procedure
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NOTE: The suction water elevation shall be that
level indicated in paragraph CAPACITIES.
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a. Performance of The Pump - The performance of the pump shall be
determined by a series of test points sufficient in number to develop a
constant-speed curve over the range of total heads corresponding to the
[static][pool-to-pool][bowl] heads in paragraph CAPACITIES. The
performance/test range shall include additional testing at total heads
600 mm 2 feet higher than the total head determined in paragraph
CAPACITIES. The lowest total head for testing shall be, as a minimum,
the total head determined from paragraph "CAPACITIES". If the test
setup permits testing at lower total heads, the range of total heads
shall be extended 600 mm 2 feet lower. Testing shall be inclusive for
[each][the] speed(s) involved with the sump at elevation[s] [_____]
[and [_____] NGVD feet]. Tests shall be made using prototype [total]
[pool-to-pool] heads. Head differentials between adjacent test points
shall not exceed 900 mm 3 feet, but in no case shall less than 10
points be plotted in the pumping range. If the plot of the data
indicates a possibility of instability or dip in the
head-versus-capacity curve, a sufficient number of additional points on
either side of instability shall be made to clearly define the
head-capacity characteristics. When a scale model of the pump is
tested, the efficiency of the prototype pump shall be considered to be
the efficiency of the model. No other computation or adjustment of
model efficiency to prototype conditions will be permitted.
b. Sump Elevations - Tests shall be conducted at two different sump
elevations (approximately a 1500 mm 5 foot differential) to determine
the effect of test sump geometry on the performance of the pump.
Should the test results indicate that the performance is not the same
in all respects for both sump conditions, the Contractor shall take
whatever corrective action is necessary to produce congruent results.[
SECTION 15131A
Page 44
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