ISO 18213-5:2008 Nuclear fuel technology - Tank calibration and volume determination for nuclear materials accountancy - Part 5: Accurate determination of liquid height in accountancy tanks equipped with dip tubes, fast bubbling rate
International Organization for Standardization (ISO)
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ISO 18213-5:2008
Scope
This part of ISO 18213 specifies a procedure for making accurate determinations of liquid height in nuclear-
materials-accountancy tanks that are equipped with pneumatic systems for determining the liquid content.
With such systems, gas is forced through a probe (dip tube) whose tip is submerged in the tank liquid. The
pressure required to induce bubbling is measured with a manometer located at some distance from the tip of
the probe. This procedure applies specifically when a fast bubbling rate is employed.
A series of liquid height determinations made with a liquid of known density is required to estimate a tank's
calibration equation (see ISO 18213-1), the function that relates the elevation (height) of a point in the tank to
an independent determination of tank volume associated with that point. For accountability purposes, the
tank's measurement equation (the inverse of its calibration equation) is used to determine the volume of
process liquid in the tank that corresponds to a given determination of liquid height.
ISO 18213-5:2008 history
2008ISO 18213-5:2008 Nuclear fuel technology - Tank calibration and volume determination for nuclear materials accountancy - Part 5: Accurate determination of liquid height in accountancy tanks equipped with dip tubes, fast bubbling rate