ASME B73.2:2003 pdf download

ASME B73.2:2003 pdf download.Specification for Vertical In-Line Centrifugal Pumps for Chemical Process
1 SCOPE
This Standard covers motor-driven centrifugal pumps of vertical shaft, single stage design with suction and discharge nozzles in line. It includes dimensional inter- changeability requirements and certain design features to facilitate installation and maintenance. It is the intent ofthis Standard thatpumps ofthe samestandarddimen- sion designation, from all sources of supply, shall be interchangeable with respect to mounting dimensions and size and location of suction and discharge nozzles (see Table 1).
2 ALTERNATIVE DESIGN
Alternate designs will be considered, provided they meet the intent of this Standard and cover construction characteristics which are equivalent to and otherwise in accordance with these specifications. All deviations from these specifications shall be described in detail.
3 NOMENCLATURE AND DEFINITIONS
3.1 Source All nomenclature and definitions of pump compo- nents shall beinaccordance withthe Hydraulic Institute, ANSI/HI 1.1-1.2. 3.2 In-Line Pump An in-line pump is an overhung impeller-type pump whose driving unit is supported exclusively by the pump, and whose suction and discharge connections have a common centerline that intersects the shaft axis.
4 DESIGN AND CONSTRUCTION FEATURES
4.1 Pressure and Temperature Limits 4.1.1 Pressure Limits. Pressure limitations shall be stated by the pump manufacturer. 4.1.1.1 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 B16.42Class 150 flanges for the material used.4.1.1.2 The design pressure of jackets shall be at least 100 psig (690 kPa gage) at 340°F (170°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. 4.1.1.3 Casing, stuffing box cover or seal chamber, and jackets shall be designed to withstand a hydrostatic test at 1.5 times the maximum design pressure for the particular component and material of construction used (see para. 5.2.1). 4.1.2 Temperature Limits. Pumps should be available for operating temperatures up to 500°F (260°C). Jack- eting and other modifications may be required to meet the operating temperature. 4.2 Flanges Suction and discharge nozzles shall be flanged. Flanges shall conformto ASME B16.5 Class 150 or 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. As an option, Class 300 flanges per ASME B16.5 or B16.42 may be offered subject to the manufacturer’s casing pressure-temperature limitations. All pumps regardless of flange rating shall conform to the SD dimension shown in Table 1. SD dimensions shall be the same for all class flanges (see Table 1).4.3 Casing 4.3.1 Drain Connection Boss(es). Pump casing shall have cast boss(es) to provide for drain connection(s). Boss size shall accommodate 1 ⁄ 2 in. NPT min. Boss(es) shall be drilled and tapped when specified by customer. 4.3.2 Gage Connection Bosses. The suction and dis- charge nozzles shall have bosses for gage connections. Boss size shall accommodate 1 ⁄ 4 in. NPT min., 1 ⁄ 2 in. NPT preferred. Boss(es) shall be drilled and tapped when specified by customer. 4.3.3 Support. The casing shall be designed to be supported by the suction and discharge flanges alone when mounted with the shaft in the vertical position; however, all casings shall be designed to accommodate an optional auxiliary support.4.4 Impeller 4.4.1 Types. Impellers ofopen, semi-open, and closed designs are optional. 4.4.2 Adjustment. Means for external adjustment (without disassembly of the pump except for the cou- pling guard) of the impeller axial clearance shall be provided if adjustment is required by the design. 4.4.3 Balance. Impellers shall meetISO 1940/1 Grade 6.3 after final machining. 4.4.4 Attachment. The impeller may be keyed or threaded to the shaft with rotation to tighten. Shaft threads and keyways shall be protected so they will not be wetted by the pumped liquid.