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# Commonly used conversion units in water treatment industry

Sep 23, 2017

1, the conductivity of water treatment

1μs / cm (micro-Siemens / cm)

= 10-4s / m (Siemens / m)

= 0.1ms / m (cents Siemens / m)

2, water treatment resistivity

Resistivity = 1 / Conductivity

10 MΩ · cm (megohm · cm) = 0.1 μs / cm (micro-Siemens / cm)

3, the concentration of units

(1) mass concentration

1 mg / L (mg / l)

= 1ppm

= 103ppb

= 106ppt

= 10-3 μg / L (μg / l)

(2) molar concentration

1 mol / L (mol / l)

= 1000 mmol / L (mmol / liter)

10 flow rate, flow rate

1 gallon per minute (gpm) = 0.272 m3 / h (m3 / h) = 272 liters / hour (L / h) = 4.53 L / min

The normal flow rate should be controlled at 4-6 m / h

4, hardness

1 grain / gallon (grain / gal) = 17.1 mg / l (mg / L)

1 grain / gallon (grain / gal) = 0.342 mg equivalent / liter (mgN / L)

The gram equivalent of CaCO3 is 50, that is, the mass of 1 g equivalent of CaCO3 is 50 g;

1 mg equivalent / liter = 50 mg / l

(1 thousand lattice = 1.297 gram equivalent)

12 water pressure

1 psi = 0.07 kg / cm2 = 0.006895 MPa (MPa)

5, pressure units

1MPa (MPa)

= 10bar (bar)

= 103KPa (kPa)

= 106Pa (Pa)

= 145 psi (psi)

1 mmHg (1 mmHg) = 13.6 mmH2O (13.6 mm water column) = 133.32 Pa (Pa)

1 mmH2O (mm water column) = 9.8 Pa (Pa)

1 atm (standard atmospheric pressure) = 760 mmHg = 0.101 MPa

Note: Since the pressure of the gas and the liquid is caused by gravity, the pressure is the pressure