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ASME B73.3-2015 pdf download

ASME B73.3-2015 pdf download.Specification for Sealless Horizontal End Suction Centrifugal Pumps for Chemical Process.
4 NOMENCLATURE AND DEFINITIONS 4.1 Definitions of Terms All nomenclature and definitions of pump compo- nents shall be in accordance with ANSI/HI 5.1 through ANSI/HI 5.6. canned motor pump (CMP): a type ofsealless pump where the impeller is mounted on the end of the shaft that is overhung from its motor bearing supports. The impeller is mounted directly on the rotor assembly, making one rotor assembly. The bearings are supported by housings ateachend ofthe rotorassembly. The motor components are protected from the process liquid by corrosion resis- tant, nonmagnetic liners (shells). During operation, the motor section and bearings are either cooled and lubri- cated by the process liquid or a flush introduced from an external source. close coupled magnetic drive pump: a sealless magnetic drive pump as defined below except the outer magnet ring is mounted on the driver shaft. magnetic drive pump (MDP): a type of sealless pump where the impeller is mounted on a rotor assembly that contains the inner magnet ring of a magnetic drive. The process fluid is retained by a corrosion resistant containment shell that separates the inner magnet ring and the outer magnet ring. The outer magnet ring is mounted on the shaft of a frame that is coupled to a motor or power device. plastic lined sealless pump: a type of sealless magnetic drive pump which consists of a metal outer casing cov- ered internally by a plastic lining for chemical resistance. The metal outer casing gives structural rigidity for pres- sure containment and externally applied nozzle loads. The containment shell may consist of a reinforced outer shell with a plastic insert for chemical resistance, an engineered ceramic or other nonmetallic construction. All nonpressure-containing wetted parts are either cov- ered by a plastic lining or may be made of an engineered ceramic. separatelycoupled magnetic drive pump: a sealless magnetic drive pump as defined above where the outer magnet ring is mounted on the shaft of a frame that is separately coupled to a motor or power device and mounted on a common baseplate. 4.2 Additional Definitions auxiliary piping: includes all piping connected to the pump excluding the main piping connected at the pump suction and discharge flanges. Auxiliary piping includes piping, tubing, and all attached components such as valves, instrumentation, and coolers. nonpressure-containing nonwetted parts: pump parts that do not contain or retain pressure and are not wetted by the pumped fluid. 15 nonpressure-containing wetted parts: pump parts that do not contain or retain pressure, but are wetted by the pumped fluid (e.g., wear ring). pressure-containing nonwetted parts: pump parts that con- tain pressure but are not wetted by the pumped fluid (e.g., lined casing, cover). pressure-containing wetted parts: pump parts that contain pressure and are wetted by the pumped fluid (e.g., casing). pressure-retaining nonwetted parts: pump parts that retain pressure but are not wetted by the pumped fluid (e.g., adapter, fasteners). supplier: manufacturer or manufacturer’s representative that supplies the equipment. 5 DESIGN AND CONSTRUCTION FEATURES 5.1 Pressure and Temperature Limits 5.1.1 Pressure Limits. Pressure limitations shall be stated by the pump manufacturer. See para. 5.11 for auxiliary piping. 5.1.1.1 The design pressure of the casing, casing cover, containment shell, and secondary containment, if applicable, shall be at least as great as the pressure– temperature rating of ASME B16.5 Class 150 flanges or ASME B16.42 Class 150 flanges for the material used. 5.1.1.1.1 For plastic lined sealless pumps, the pressure limitationfor the materialofconstruction ofthe casing, casing cover, containment shell, and secondary containment, if applicable, shall have a design pressure at least equal to the pressure–temperature rating of ASME B16.42 Class 150 flanges. Pumps may be offered with higher design pressures than the minimum stated pressures. Pumps having lower design pressures than the minimum stated require approval by the purchaser. 5.1.1.2 The design pressure of jackets shall be at least 100 psig (689 kPa gage) at 340°F (171°C). Heating jackets may be required for jacket temperatures to 500°F (260°C) with a reduction in pressure corresponding to the reduction in yield strength of the jacket material. 5.1.1.3 The casing, casingcover, and containment shell (and secondary pressure-containing boundary and jackets, if applicable) shall be designed to withstand a hydrostatic test at 1.5 times the maximum design pres- sure for the particular component and material of con- struction used (see para. 6.3.1.1). 5.1.1.4 All primary pressure-containing parts shall be capable of resisting a vacuum of 14.7 psi (760 mm HG) at 68°F (20°C).

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