ASME B73.2:2016 pdf download

ASME B73.2:2016 pdf download Specification for Vertical In-Line Centrifugal Pumps for Chemical Process
4NOMENCLATURE AND DEFINITIONS4.1 Definition of Terms
The nomenclature and definitions of pump compo-nents shall be in accordance with ANSI/HI 1.1-1.2 exceptas noted below.
4.2Additional Definitions
auxiliary piping: includes all piping connected to thepump, seal chamber, packing box,or seal piping planexcluding the main piping connected at the pump suc-tion and discharge flanges.Auxiliary piping includespiping, tubing, and all attached components such asvalves, instrumentation, coolers, and seal reservoirs.in-line pump: an overhung impeller-type pump whose
driver is supported exclusively by the pump, and whosesuction and ‘discharge connections have a common cen-
terline that is perpendicular to, and intersects, theshaft axis.
non-pressure-containing nonwetted parts: pump parts that
do not contain or retain pressure and are not wetted bythe pumped fluid.
non-pressure-containing wetted parts.: pump parts that donot contain or retain pressure, but are wetted by thepumped fluid (e.g., wear ring).
pressure-containing wetted parts: pump parts that containpressure and are wetted by the pumped fluid (e.g., cas-ing and sealing cover).
pressure-retaining nonwetted parts: pump parts that retainpressure but are not wetted by the pumped fluid (e.g..adapter and fasteners).
sealing cover: refers to seal chamber, universal cover, orpacking box.
supplier: manufacturer or manufacturer’s representativethat supplies the equipment.
5 DESIGN AND CONSTRUCTION FEATURES5.1 Pressure and Temperature Limits
5.1.1 Pressure Limits. Pressure limitations shall bestated by the pump manufacturer. See para.5.8.3 forauxiliary 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 ofASME B16.5 Class 150 flanges or ASME B16.42 Class 15oflanges for the material used.
5.1.1.2The design pressure of jackets shall be atleast 100 psig (689 kPa) gage at 340°F(171°C).Heatingjackets may be required for jacket temperatures to500°F(260°C) with a reduction in pressure correspond-ing to the reduction in yield strength of the jacketmaterial.
5.1.1.3Casing, sealing cover, gland,and jacketsshall be designed to withstand a hydrostatic test at1.5 times the maximum design pressure for the particu-lar component and material of construction used (seepara.6.2.1.1).
5.1.2 Temperature Limits.Temperature limitationsshall be stated by the pump manufacturer. Pumps
should be available for temperatures up to 500F(260°C).Jacketing and other modifications may be required tomeet the operating temperature. See para.5.8.3 for auxil-iary piping.
5.2 Flanges
5.2.1 General. Suction and discharge nozzles shallbe 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 markingrequirements are not applicable and the maximumacceptable tolerance on parallelism of the back of theflange shall be 3 deg. Flanges shall be flat-faced at thefull raised-face thickness (minimum) called for in theASME standards for the material of construction.Raised-face flanges may be offered as an option.Boltholes shall straddle the horizontal and vertical center-line.Bolt holes may be tapped when adequate space fornuts is not available behind flanges as noted in Table 1.Through bolt holes are preferred. When tapped holesare supplied, they shall be noted on the outline drawing.
5.2.2 Class 300 Option.As an option, Class 300flanges in accordance with ASME B16.5 or ASME B16.42may be offered with pressure ratings subject to the man-ufacturer ‘s casing pressure- temperature limitations.Class 300 flanges shall be flat-faced at full raised-facethickness (minimum), or raised-face flanges may beoffered as an option.
5.2.3All pumps regardless of flange rating shallconform to the sD dimensions shown in Table 1.
5.2.4 Heavy Hex Nuts. Where heavy hex nuts cannotbe used, the location shall be noted on the outline
drawing.
NOTE:ASME B16.5 and ASME B16.42 indicate the use of heavyhex nuts for certain flange connections.On many B73 pumps,heavy hex nuts cannot be used due to available space. Standardhex nuts are often substituted.The use of standard hex nuts maynot allow the achievement of full bolt stress, which may impactproper gasket compression. With most gasket materials, this doesnot reduce the gasket’s ability to properly seall.Howewer, this is aconsideration for metallic and semi-metallic (i.e.. spiral wound)gaskets where significant preload may be required to achieve suffi-cient tightness.
5.3 Casing
5.3.1 Drain Connection Boss(es). Pump casing shallhave boss(es) to provide for drain connection(s) in thelowest part of the casing.Boss size shall accommodate