To calculate the theatrical volume of water required to achieve a change in pressure, the volume pressure equation is
VP = (0.0884 ri / t + A) X 10-6 X Vt X ∆P X K
Where:
VP = omputed water amount required to raise by P the pressure in the section to be tested (m3)
Vt = Geometrical Volume of the section (m3) = m3
ri = Nominal inner radius of the pipe (mm) = mm
t = Nominal pipe thickness (mm) = mm
A = Isothermal compressibility value for water at the pressurization temperature in the P . range (bar -1) X 106. Refer graph. =
∆P = Pressure Rise (bar) = Kg
K = A dimensionless coefficient that is equal to a value of 1.02 for longitudinally . . . . welded pipe. = 1.02
Therefore Vp = m3
= litre
Actual volume of water drained to drop pressure by 0.5 Kg = Litre (V1)
Therefore V1 / Vp =
Since the ratio is less than 1.06 the filling is acceptable and the test section may be pressurised to the final test pressure.
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