ASME B73.2:2016 pdf download

ASME B73.2:2016 pdf download.Specification for Vertical In-Line Centrifugal Pumps for Chemical Process
1 SCOPE
This Standard is a design and specification standard that covers metallic centrifugal pumps of vertical shaft single-stage design with suction and discharge nozzles in-line. This Standard includes dimensional inter- changeability requirements and certain design features to facilitate installation and maintenance and enhance reliability and safety of B73.2 pumps. It is the intent of this Standard that pumps of the same standard dimen- sion designation from all sources of supply shall be interchangeable with respect to mounting dimensions, size, and location of suction and discharge nozzles (see Table 1). Maintenance and operation requirements are not included in this Standard.
4 NOMENCLATURE AND DEFINITIONS
4.1 Definition of Terms The nomenclature and definitions of pump compo- nents shall beinaccordance withANSI/HI 1.1-1.2except as noted below. 4.2 Additional Definitions auxiliary piping: includes all piping connected to the pump, seal chamber, packing box, or seal piping plan excluding the main piping connected at the pump suc- tion and discharge flanges. Auxiliary piping includes piping, tubing, and all attached components such as valves, instrumentation, coolers, and seal reservoirs. in-line pump: an overhung impeller-type pump whose driver is supported exclusively by the pump, and whose suction and discharge connections have a common cen- terline that is perpendicular to, and intersects, the shaft axis. non-pressure-containing nonwetted parts: pump parts that do not contain or retain pressure and are not wetted by the pumped fluid. non-pressure-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 wetted parts: pump parts that contain pressure and are wetted by the pumped fluid (e.g., cas- ing and sealing cover). pressure-retaining nonwetted parts: pump parts that retain pressure but are not wetted by the pumped fluid (e.g., adapter and fasteners). sealing cover: refers to seal chamber, universal cover, or packing box. 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. 5.8.3 for auxiliary piping. 5.1.1.1 The design pressure of the casing, includ- ing seal chamber or stuffing box and gland, 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. 5.1.1.2 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 correspond- ing to the reduction in yield strength of the jacket material.5.1.1.3 Casing, sealing cover, gland, and jackets shall be designed to withstand a hydrostatic test at 1.5 times the maximum design pressure for the particu- lar component and material of construction used (see para. 6.2.1.1). 5.1.2 Temperature Limits. Temperature limitations shall be stated by the pump manufacturer. Pumps should be availablefor temperatures up to500°F (260°C). Jacketing and other modifications may be required to meetthe operating temperature. See para. 5.8.3 for auxil- iary piping. 5.2 Flanges 5.2.1 General. Suction and discharge nozzles shall be flanged. Flange drilling, facing, and minimum thick- ness shall conform to ASME B16.5 Class 150 or ASME B16.42 Class 150 standards except that marking requirements are not applicable and the maximum acceptable tolerance on parallelism of the back of the flange shall be 3 deg. Flanges shall be flat-faced at the full raised-face thickness (minimum) called for in the ASME standards for the material of construction. Raised-face flanges may be offered as an option. Bolt holes shall straddle the horizontal and vertical center- line. Bolt holes may be tapped when adequate space for nuts is not available behind flanges as noted in Table 1. Through bolt holes are preferred. When tapped holes are supplied, they shall be noted on the outline drawing.