Conversion of pressure reading into kpa, Mechanical Engineering

Convert following reading of pressure to kPa, supposing that the barometer reads 760mm Hg.

(1) 90cm Hg gauge
(2) 40cm Hg vacuum
(3) 1.2m H
2O gauge

Sol: Given that h = 760mm of Hg for Patm

Patm =   gh = 13.6 × 103  × 9.81 × 760/1000 = 101396.16

N/m2 = 101396.16Pa = 101.39KPa                                                                          ...(i)

(a)  90cm Hg gauge

Pgauge = gh = 13.6 × 103  × 9.81 × 90/100 = 120.07KPa                                             ...(ii)

Pabs  = Patm  + Pgauge = 101.39 + 120.07

Pabs  = 221.46KPa                        .......ANS

(b)  40cm Hg vacuum

Pvacc =  gh = 13.6 × 103  × 9.81 × 40/100 = 53.366KPa                                           ...(iii)

Pabs  = Patm  - Pvacc

= 101.39 - 53.366

Pabs  = 48.02KPa                           .......ANS

(c)1.2m Water gauge

Pgauge  =   gh = 1000 × 9.81 × 1.2 = 11.772KPa                                                              ...(iv)

Pabs  = Patm  + Pgauge

= 101.39 + 11.772

Pabs  = 113.162KPa          .......ANS

Posted Date: 10/15/2012 1:37:07 AM | Location : United States







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