ASME B73.3 pdf download Specification for Sealless Horizontal End Suction Metallic Centrifugal Pumps for Chemical Process
This Standard covers sealless centrifugal pumps of horizontal end suction single stage and centerline dis- charge design. This Standard includes dimensional interchangeability requirements and certain design fea- tures to facilitate installation and maintenance. It is the intent of this Standard that pumps of the same standard dimensional designation from all sources ofsupply shall be interchangeable with respect to mounting dimen- sions, size, and location of suction and discharge noz- zles, input shafts, baseplates, and foundation bolt holes (see Tables 1, 2, 3, and 4).
2 ALTERNATIVE DESIGN
2.1 Extended Design 1 Dimensions for an extended length design alternative are included. The extended length alternative shall con- form to the basic design features ofthis Standard includ- ing those providing interchangeability with respect to mounting dimensions at the casing, size, and location of the suction and discharge nozzles (see column heads withesuffixinTables1 through4fordimensionallimits). Manufacturers, when offering extended length pumps, shall state this fact in their proposal.
NOTE: For Tables 1 and 2 the extended length dimension is a maximum value. Any dimension between the standard and maxi- mum extended length is acceptable.
2.2 Alternative Design Alternative designs will be considered, provided they meet the intent of this Standard and cover construction and performance which are equivalent to and otherwise in accordance with this Standard. All deviations from these specifications shall be described in detail by the seller and approved by the purchaser.
3 NOMENCLATURE AND DEFINITIONS All nomenclature and definitions of pump compo- nents shall be in accordance with ANSI/HI 5.1 through 5.6. canned motor pump (CMP): a type ofsealless pump which has a common shaft to link the pump and motor in 1 The purpose of the maximum extension is to enhance bearing reliability,lubricationcontainmentsystems,secondarycontainment sealing, increased power capability, and other features. 1 a single sealed unit. The pumped liquid is circulated throughthemotor, butisisolated fromthemotorcompo- nents by a corrosion-resistant containment liner. magnetic drive pump (MDP): a type of sealless pump which utilizes an outer ring of permanent magnets or electromagnets to drive an internal rotating assembly consisting of an impeller, shaft, and inner drive member (torque ring or inner magnet ring) through a corrosion- resistant containment shell.
4 DESIGN AND CONSTRUCTION FEATURES
4.1 Pressure and Temperature Limits
4.1.1 Pressure Limits. The design pressure of the pump shall be at least as great as the pressure–tempera- ture rating of ASME B16.5 or ASME B16.42 Class 150 flanges of the material used. Primary pressure-con- taining boundary (and secondary pressure-containing boundary if required) shall be designed to withstand a hydrostatic test at 1.5 times the maximum design pres- sure for the material of construction used (see para. 5.2.1). All primary pressure-containing parts shall also be capable of resisting a vacuum of 14.7 psi (760 mmHG) at 68°F (20°C).
4.1.2 Temperature Limits. Pumps should be available for temperatures up to 500°F (260°C). Jacketing and other modifications may be required to meet the operating temperature.
4.1.3 Statement. Temperature limitations of the liq- uid at the suction flange shall be stated by the pump manufacturer. NOTE: The application of the pump shall take into consideration the fluid characteristics as supplied by the user. This will require consideration of such characteristics as specific heat and vapor pressure of the liquid which establishes these limits.
4.2 Flanges Suction and discharge nozzles shall be flanged. Flanges shall conform to ASME B16.5 or ASME B16.42 Class 150 standards except that marking requirements are not applicable and the maximum acceptable toler- ance on parallelism of the back of the flange shall be 3 deg, and bolt holes may be tapped where noted in Tables 1 and 3.