ASME B73.3:2003 pdf download

ASME B73.3:2003 pdf download Specification for Sealless Horizontal End Suction Metallic Centrifugal Pumps for Chemical Process
1 sCOPE
This Standard covers sealless centrifugal pumps ofhorizontal end suction single stage and centerline dis-charge design. This Standard includes dimensionalinterchangeability requirements and certain design fea-tures to facilitate installation and maintenance. It is theintent of this Standard that pumps of the same standarddimensional designation from all sources of supply shallbe 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).
2ALTERNATIVE DESIGN2.1 Extended Design1
Dimensions for an extended length design alternativeare included. The extended length alternative shall con-form to the basic design features of this Standard includ-ing those providing interchangeability with respect tomounting dimensions at the casing, size, and locationof the suction and discharge nozzles (see column headswithe suffix in Tables 1 through 4 for dimensional limits).Manufacturers, when offering extended length pumps,shall state this fact in their proposal.
NOTE: For Tables 1 and 2 the extended length dimension is amaximum value.Any dimension between the standard and maxi-mum extended length is acceptable.
2.2 Alternative Design
Alternative designs will be considered, provided theymeet the intent of this Standard and cover constructionand performance which are equivalent to and otherwisein accordance with this Standard.All deviations fromthese specifications shall be described in detail by theseller and approved by the purchaser.
3NOMENCLATURE AND DEFINITIONS
All nomenclature and definitions of pump compo-nents shall be in accordance with ANSI/ HI 5.1through 5.6.
canned motor punp(CMP): a type of sealless pump whichhas a common shaft to link the pump and motor in
a single sealed unit. The pumped liquid is circulatedthrough the motor, but is isolated from the motor compo-nents by a corrosion-resistant containment liner.
magnetic drive punmp (MDP): a type of sealless pumpwhich utilizes an outer ring of permanent magnets orelectromagnets to drive an internal rotating assemblyconsisting of an impeller, shaft, and inner drive member(torque ring or inner magnet ring) through a corrosion-resistant containment shell.
4DESIGN AND CONSTRUCTION FEATURES4.1 Pressure and Temperature Limits
4.1.1 Pressure Limits. The design pressure of thepump shall be at least as great as the pressure-tempera-ture rating of ASME B16.5 or ASME B16.42 Class 150flanges of the material used. Primary pressure-con-taining boundary (and secondary pressure-containingboundary if required) shall be designed to withstand ahydrostatic 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 becapable of resisting a vacuum of 14.7 psi (760 mmHG)at 68°F (20°C).
4.1.2 Temperature Limits. Pumps should be availablefor temperatures up to 500°F (260°C). Jacketing andother modifications may be required to meet theoperating temperature.
4.1.3 Statement. Temperature limitations of the liq-uid at the suction flange shall be stated by the pumpmanufacturer.
NOTE: The application of the pump shall take into considerationthe fluid characteristics as supplied by the user. This will requireconsideration of such characteristics as specific heat and vaporpressure 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 Bi6.42Class 150 standards except that marking requirementsare not applicable and the maximum acceptable toler-ance on parallelism of the back of the flange shall be 3deg, and bolt holes may be tapped where noted in Tables1 and 3.