Pietro Fiorentini S.p.a.

Stefano Bernardi

Paolo Calciolari

Paolo Nardi

Marco Pavan

Paolo Aditeo Nardi

Method for determining the density (D) of a multiphase fluid (F) flowing through a pipe () and containing a gas (G) which determines a fluctuation of the actual instantaneous density of the fluid (F), said method comprising the following steps: defining a series of consecutive time periods (S, S) which are shorter than the time length corresponding to the highest frequency-component of the fluctuation of the actual instantaneous density; conveying through a section () of the pipe () a photon beam () suited to undergo an attenuation while crossing the fluid (F); counting the actual number (A) of photons of the beam () which cross the pipe () during a first time period (S) of the series; calculating a corrected count (C) as the weighted average value of the actual count (A) and of the corrected count (C) calculated for the preceding time period (S); converting the value of the corrected count (C) into a corresponding value of the density (D) of the multiphase fluid (F) for the first time period (S) through a predefined function.

Method for determining the density of a multiphase fluid, densitometer using said method and multiphase meter using said densitometer

Measuring device () for determining the composition of the liquid phase of a liquid-gas mixture includes a duct () defining a flow direction (X) of the mixture parallel to the longitudinal development axis (Y) of the duct () and a measuring element () arranged in the duct () and suited to determine the composition of a liquid layer that flows in contact with the internal surface () of the duct (). The internal surface () of the duct () includes an intercepting surface (') suited to convey part of the liquid layer towards the measuring element (), arranged so that it is incident on the flow direction (X) and developed according to a conveyance trajectory that has a helical section and whose tangent to the outlet end (&#x2032;) intersects the measuring element ().

Measuring unit for determining the composition of the liquid phase in a multi-phase mixture

Device () for measuring electric parameters of a fluid (F), comprising: two measurement circuits () for measuring, respectively, the dielectric permittivity and the electrical conductivity of the fluid (F); two electrodes (') facing each other from opposite sides of the fluid (F); a selector system () for alternatively connecting the two measurement circuits () to the electrodes (&#x2032;). Each electrode (&#x2032;) comprises two sectors () suited to establish mutually separate electrical contact with the fluid (F) and the electrical conductivity measurement circuit () comprises two measurement sections (V, A) of different impedance, each one of which being connectable to a corresponding sector () of each electrode (&#x2032;).

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Padua, Italy

Stefano Bernardi