Table

Life of high-energy pump suction stage

A) Pump data for computing life [at the B.E.P. of 20,000 gpm (1,262 m3/s)]

• tbiade = 0.42 in (10.7 m) ; thus, Fmal = 1 (13 Cr martensitic stainless steel)

• Suction-side cavitation in 350°F (177°C) boiler feedwater, for which A=0.705

• Inlet flow coefficient ^ =0.3; Ue = 274.2 ft/sec (83.57 m/s); t4/2g=l 168ft (356 m)

B) Results for inception occurring at NPSH = blade inlet tip speed head and half that NPSHj.

a) Ti =1.0 = 3.8 x t3% NPSHi = 1168 ft (356 m) Lcav = 57.0 mm MDPR= 0.0014482 mm/hour Life = 5,541 hours = 7.6 months b)Ti = 0.5 = 1.9 XT«. NPSHi = 584 ft (178 m) 13.1 mm

0.000022257 mm/hour 360,000 hours = 41 years

C) Sample Life Calculation W^L Stage

71x13.37

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