ASME B73.2:2016 pdf free download – Specification for Vertical In-Line Centrifugal Pumps for Chemical Process
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.
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 available for temperatures up to 500°F (260°C). Jacketing and other modifications may be required to meet the 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. 5.2.2 Class 300 Option. As an option, Class 300 flanges in accordance with ASME B16.5 or ASME B16.42 may 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-face thickness (minimum), or raised-face flanges may be offered as an option.
5.3.6 Gasket. The casing-to-cover gasket(s) shall be confined on the atmospheric side to prevent blowout. Design shall consider thermal cycling that may occur as a condition of service. Gaskets shall be selected so the required seating stress is compatible with the available bolt load (strength and area). The gasket material shall be suitable for the service conditions and flange facing/finish.
5.3.7 Bolting. The pressure-containing fasteners shall be designed to account for maximum allowable working pressure (MAWP) and be capable of main- taining a seal on the gasket during operation. The fasten- ers shall have a sufficient bolt area to ensure that the resulting tensile stresses during design loading do not exceed the allowable bolt stresses given in ASME Section II, Part D (Table 3).