Consider the Peerless Type 16A18B horizontal split case centrifugal pump (Appendix C). Use these performance data to verify the similarity rules for

(a) impeller diameter change 

(b) operating speeds of 705 and \(880 \mathrm{rpm}\) (The scale change between speeds).

Data From Appendix C

60 60 Head (ft) D1 18.00 in.; D2 = 17.00 in.; D3 = 16.00 in.; D4 = 15.00 in. 40 20 20 NPSH (ft) 15 10 2505 Power (hp) 80 60 40 20 70 D4 Efficiency (%) 90 88 80 70 60 50 40 D1 30 20 10 2000 4000 6000 8000 10,000 Flow (US gpm)