ASME B73.1M-2001 pdf download

ASME B73.1M-2001 pdf download.SPECIFICATION FORHORIZONTAL END SUCTIONCENTRIFUGAL PUMPS FOR
CHEMICAL PROCESS.
(c) Pump Casing Jacket
(d) Bolt on External Heating and Cooling Jacket
(e) Bearing Housing Cooling
4.3.6 Gasket(s). The casing-to-cover gasket shall be confined on the atmospheric side to prevent blowout.
4.4 Impeller
4.4.1 Types. Impellers of open. semi-open. and closed designs are optional.
4.4.2 Adjustment. Means for external adjustment (without disassembly of the pump except for the coupling guard) of the impeller axial clearance shall be provided if adjustment is required by the design.
4.4.3 Balance. Impellers shall meet ISO 1940 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 ill not be wetted by the pumped liquid.
4.5 Shaft
4.5.1 Diameter. The seal mounting surface includes the shaft or shaft sleeve outside diameter within the stuffing box or seal chamber and enough length beyond to accommodate outside seals. The diameter of the seal mounting surface shall be sized in increments of in. (3.2 mm). To provide for the use of mechanical seals, the tolerance on that diameter shall not exceed nominal to minus 0.002 in. (0.05 mm).
4.5.2 Finish. Surface finish of the shaft or sleeve through the stuffing box or seal chamber and at rubbing contact bearing housing seals shall not exceed an arithmetic roughness average of 32 pin. (0.8 pm) unless otherwise required for the mechanical seal.
4.5.3 Runout. Shaft runout shall be limited as
Ibilows:
(a) shaft rotated on centers: 0.001 in. (0.025 mm) full indicator movement (FIM) reading at any point:
(b) outside diameter of shaft or removable sleeve when installed in pump: 0.002 in. (0.05 mm) FIM at the gland end of stuffing box or seal chamber (see Fig. I).
4.5.4 Deflection. Dynamic shaft deflection at the impeller centerline shall not exceed 0.005 in. (0.13 mm) anywhere within the design region as specified in para. 5.1.6. Hydraulic loads and shaft deflection shall be calculated in accordance with HI 1.3.
4.5.5 Running Clearances. Running clearance must be sufficient to prevent internal rubbing contact within the design region (pard. 5.1.6) and is subjected to the maximum allowable flange loads as specified in para. 5.1.2.
4.5.6 Critical Speed. The first lateral critical speed of the rotating assembly shall be at least 120% of the maximum operating speed. A “dry critical speed’s calculation (see HI 9.6.4) is adequate to verify compliance. I-Il 9.6.4 shall be used to calculate static deflections used for the critical speed calculation.
4.5.7 Fillets and Radii. All shaft shoulder fillets and radii shall be made ts large as practical and finished to reduce additional stress risers.
4.6 Shaft Sealing
4.6.1 Design. Two basic types of sealing covers shall be offered, one called a seal chamber and a second called a stuffing box. The seal chambcr is designed to accommodate mechanical seals only and can be of several designs for various types of seals. The design includes a separate gland plate where required. The stuffing box is designed for packing. but may be able to accommodate mechanical seals as an alternative Figures 2 and 3 show some piping systems that can be used with the various seals shown in Fig.
4. A separate universal cover adapter to accommodate either a seal chamber or stuffing box is optional.