ASME B73.3:2003 pdf free download

ASME B73.3:2003 pdf free download.Specification for Sealless Horizontal End Suction Metallic Centrifugal Pumps for Chemical Process.
5.1.6.1 Design Region. Pumps shall be designed to operate continuously between 110% of best efficiency flow and the minimum flows shown in Table 7, unless specifically noted otherwise by the manufacturer, and meet the requirements olpara. 5.1,4 (vibration) when pumping water at ambient conditions.
CAUTION: The values In Table7 do not con,der minimum thermal flow for a specific installation, therefore, the practical minimum operating flow may be higher than shown. I’umpage is heated as It goes through a pump and the minimum thermal flow is that where the temperature rises enough through the pump that recirculation of some of the flow reduces theavailabic net positive suction head below that required by the pump, resulting in cavitation. Refer to ANSIINI 13 for detailed application information.
5.1.6.2 NPSH Margin. An operating NI’SH margin (NPSHA>NPSHR) is necessary to ensure satisfactory operation. A margin of 3 ft (0.9 m) or a margin ratio of (NPSHA/NPSHR) 1.2, whichever yields the greater difference, is often adequate. Refer to ANSI/Ill 9.6.1 for additional application information.
5.2 Tests
5.2.1 Hydrostatic
5.2.1.1 Standard Hydrostatic. After machining, all pressure-containing parts shall be hydrostatically tested for 10 mm. minimum with water at 1.5 times the maximum design pressure corresponding to 100°F (38°C) for the material of construction used.
NOTE: The pressure rating of jackets may not be the same as required for pumpage-containing parts.
When secondary control or secondary containment is specified, the following hydrostatic testing must also be performed. The secondary containment components, or in the case of secondary control, the secondary pressure casing, shall be hydrostatically tested in accordance with para. 1.6.4 of ANSI/HI 1.6 or pneumatic tested in accordance with ND-6112 of the ASME Boiler and Pressure Vessel Code, Sedion III, Division 1, Subsection ND.
5.2.1.2 Assembled Pump Hydrostatic Test. When specified, the assembled pump test shall be in accordance with para. 1.6.4 of ANSI/HI 1.6.
5.2.2 HermetIc Integrity Test. When specified, a hermetic integrity test shall be performed on the pump unit after final assembly. Prior to testing, all liquid shall be removed from all internal cavities.
CAUTION: Wetted material moisture retention characteristics should be reviewed against the application prior to testing. No disassembly is permitted after this test. This test shall be performed in accordance with pare. 5.63 of ANSI1HI 5.1 through 5.6.
5.2.3 Performance Test. When performance tests are relevant test information including performance curves,the date of the tests, and the signature of the person(s)responsible for conducting the tests shall be delivered aspart of the pump documentation.
5.2.3.1 Mechanical lntegrity Test. When specified, amechanical integrity test shall be performed on the pumpto demonstrate that it will operate mechanically asdesigned.This test is intended to detect mechanical inter-ferences, ball bearing defects, and bushing bearing(s)defects. This test shall be performed in accordance withpara. 5.6.4 of ANSI /HI 5.1 through 5.6.This test isincluded in the optional performance test.
5.2.3.2 Net Positive Suction Head Required (NPSHR)Test. When specified, an NPSHR test shall be performedin accordance with para.1.6.6 of ANSI/HI 1.6.When thistest is specified, the performance test must also be specified.