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500 1000 1500 2000 2500 3000 3500 4000 4500 FLOW RATE, GPM FIGURE 29 Plotted pump performance

500 1000 1500 2000 2500 3000 3500 4000 4500 FLOW RATE, GPM FIGURE 29 Plotted pump performance

3. To give the buyer some assurance that requirements are being met

4. To replace or supplement field testing of a prototype

5. To compare performances of several models

Model testing in advance of final design and installation of a large unit not only provides advance assurance of satisfactory performance but allows for alterations in time for incorporation into the prototype.

Testing Procedures The model should have complete geometric similarity to the prototype in all wetted parts between the intake and discharge sections of the pump. The model should be tested in the same horizontal- or vertical-shaft position as the prototype. The speed of the model should be such that, at the test head, the specific speed for each test run is the same as that of the installed unit or prototype. Unless otherwise specified, the suction head or suction lift should give the same (cavitation factor) value.

If model and prototype diameters are D1 and D, respectively, then the model speed N1 and capacity Q1 under the test head H1 must agree with the relations

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