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V-16 (rev. 2) Classification of Liquids for the Approval of Liquid Meters
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Classification of Liquids for the Approval of Liquid Meters, in PDF format, 110 KB
Table of Contents
1.0 Purpose
2.0 Scope
3.0 Background
4.0 Definitions
5.0 Use of the tables
6.0 Revisions
7.0 Additional Information
Date: 2005-07-01
Bulletin: V-16 (rev. 2)
Category: Volume
Supersedes: V-16 (rev. 1)
1.0 Purpose
The purpose of this bulletin is to facilitate the approval of liquid meters that are designed to measure a variety of products. The various liquids normally measured volumetrically have been categorized into groups of liquids having similar physical characteristics and chemical compatibility.
2.0 Scope
This bulletin is applicable to positive displacement meters, turbine meters with certain limitations on viscosity for a given group, and to mass flow meters.
3.0 Background
When meters are submitted for approval, the manufacturer is not always aware of all the potential products that the meter may be used to measure. Experience has shown that liquids can be grouped together according to characteristics that effect their measurability, such as viscosity, lubricity and compatibility. Prior to the development of this bulletin, a formal evaluation was required when requests for new products applications were submitted.
The tables found in this document have been developed in conjunction with the National Conference of Weights and Measures (NCWM) and are intended to be the same as those found in the NCWM Publication 14. This was done to for the benefit of meter manufacturers.
4.0 Definitions
All words and expressions used in this bulletin have the same meaning as in the regulations.
5.0 Use of the tables
5.1 Approval applicants have the responsibility of stating the types of products and the viscosity and density ranges they wish to be included in the Notice of Approval for a particular meter. The following sections detail how additional products will be added to approvals.
5.2 Positive Displacement and Turbine Meters
5.2.1 A liquid meter that is successfully tested on only one liquid will be approved for use in trade for that liquid only.
5.2.2 If subsequently, the meter is successfully tested on a second liquid in the same sub-group, the meter will be approved for the whole liquid sub-group provided that the viscosities of the two liquids involved adequately bracket the sub-group's range from the lowest to the highest viscosity.
5.2.3 If an approval applicant finds a new product application for a meter that has already received approval, and the new product falls within the sub-group currently listed on the Notice of Approval, no additional approval testing is required; if the product does not fall within the sub-group currently listed, additional approval testing must be performed.
5.3 Mass Flow Meters (Coriolis Meters)
5.3.1 For a mass flow meter to receive approval for a single, normally liquid product, it must demonstrate acceptable performance when tested with a normally liquid product having a density that does not vary by more than ±100 kg/m3.
5.3.2 For a mass flow meter to receive approval for a range of densities in the normal liquid product group, tests must be conducted with two liquids within the product group. Upon successful completion of these tests, all other normally liquid products having densities between the densities of the two products tested will be included in the Notice of Approval. This does not apply to the following product groups: Compressed Liquids, Cryogenic Liquids and Heated Products. In the case of these product groups, only one liquid within each group is required to be tested. Upon successful testing, the entire product group will be covered in the Notice of Approval.
5.3.3 Multi-product applications (that is, applications in which the meter will be used to measure different products that have densities varying by more than 100 kg/m3 without a change to zero or calibration of the meter) must include a multi-product test. This test requires the meter to be tested initially on one product of a known density and tested again on another product with a known density of at least ±200 kg/m3 from the initial product density. The range may be extended by testing on a product from any of the product groups having a density greater than ±200 kg/m3 from the initial product density.
6.0 Revisions
6.1 Revision 1, issued 1996-01-01, has changes to the viscosity values to include units in SSU, centistokes and centipoise as well as slight changes to the specific gravity values.
6.2 Revision 2, issued 2005-05-13, provides the policy for evaluating mass flow meters for different product applications. The bulletin was also reformatted and the “background” section added, along with a few other non-significant test changes.
7.0 Additional Information
For additional information regarding this bulletin, please contact the Senior Program Officer responsible for volume measurement.
Dennis Beattie
Senior Program Officer, Volumetric
Weighing and Measuring Division
Program Development Directorate
Tel: (204) 983-8910
Fax: (204) 983-5511
Dennis Beattie
Table 1: Families of Liquids as related to Positive displacement and Turbine meters, in PDF format, 89 KB
Table 2: Families of Liquids as related to Mass Flow Meters (Coriolis Meters), in PDF format, 58 KB
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