ISO 8222:2020 pdf download.Petroleum measurement systems — Calibration — Volumetric measures, proving tanks and field measures (including formulae for properties of liquids and materials)
1 Scope
This document describes the design, use and calibration of volumetric measures (capacity measures) which are intended for use in fixed locations in a laboratory or in the field. This document gives guidance on both standard and non-standard measures. It also covers portable and mobile measures. This document is applicable to the petroleum industry; however, it may be applied more widely to other applications. This document excludes measures for cryogenic liquids and pressurized measures as used for liquid petroleum gas (LPG) and liquefied natural gas (LNG). Volumetric measures are classified as test measures or prover tanks depending on capacity and design. Measures described in this document are primarily designed, calibrated and used to measure volumes from a measure which is wetted and drained for a specified time before use and designated to deliver. Many of the provisions, however, apply equally to measures which are used to measure a volume using a clean and dry measure and designated to contain. Guidance is given regarding commonly expected uncertainties and calibration specifications. The document also provides, in Annex A, reference formulae describing the properties of water and other fluids and materials used in volumetric measurement more generally.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1.1 accuracy
closeness of the agreement between a measured quantity value and a true quantity value of a measurand
Note 1 to entry: The concept ‘measurement accuracy’ is not a quantity and should not be given a numerical value.
The quantitative expression of accuracy should be in terms of uncertainty. “Good accuracy” or “more accurate”implies small measurement error. Any given numerical value should be taken as indicative of this.
[SOURCE: VIM: 2012, 2.13]
3.1.2 adjustment
set of operations carried out on a measuring system so that it provides prescribed indications corresponding to given values of a quantity to be measured
Note 1 to entry: Adjustment should not be confused with calibration, which is a prerequisite for adjustment.
Note 2 to entry: After adjustment, a recalibration is usually required.
[SOURCE: VIM: 2012, 3.11]
3.1.3 automatic pipette
overflow pipette
high precision measure, where the volume withdrawn is defined by a top overflow weir rather than a gauge scale
3.1.4 brim measure
field measure where the volume is defined by an overflow from the top edge of the neck
ISO 8222:2020 pdf download
