Pump industry suppliers - The correct chemical pump pressure measurement method

the correct chemical pump pressure measurement method

( 1) Section A - is measured with A pressure gauge A place of pressure: P/rho g = PM/rho g + Z < / P > < P > PM - type Gauge pressure; Z - Table elevation difference.

pressure gauge position is higher, the lower the measured pressure, the lower the pressure gauge position, the higher the measured pressure. The measurement section ( Datum) Pressure, table above datum plus Z, below should be minus Z, namely on the decrease. If the pressure gauge connected with gas in the pipeline, the Z = 0.

( 2) Section A - is measured with A liquid column manometer A place of pressure: p = rho mg Δ rho h + gZ, p/rho g = rho mg Δ h/rho + Z

liquid on vacuum pressure gauge and the higher the chemical pump as the barometer is part, measure the work pressure is lower, the lower part, measure the higher working pressure for the precise measurement of cross section, Reference point) Work pressure, liquid level transmitter 0 in basis points above should add Z, we should lose the Z in directly. We have add. Z to join lateral pressure point pressure liquid plan to benchmark ratio, if vacuum pressure gauge connection pipe filled with gas, Z = 0. Can see that, when the working pressure in precise measurement, accurate measurement every working pressure and Z must be changed, is not conducive to accurate measurement.

p /ρg =ρmgΔh /ρ- 0. 5Δh=Δh( ρm - 0. 5ρ) / rho + delta Z

if it is mercury liquid column ( ρm = 13。 6×103 kg／m3) Measuring the liquid medium is water ( ρ= 1×103公斤/立方米) On, the type into p/rho g = 13. 1 Δ h + Δ Z

all with chemical pump body connection pipe, pipe installation, and the grease pipe cleaning, chemical pump design gas corrosion similar using two centrifugal pumps, from the basic theory C or numerous values are the same, which can calculate the design scheme of the water pump NPSH NPSH: in fact pump is difficult to ensure that similar imported, main parameters and the centrifugal water pump imported geometry to the harm of cavitation is very sensitive, so when specifications and speed than large apart, calculate the cavitation characteristics of deviation.

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