Gas trading metering instruments

The main requirement is that the precision must meet the specified standards.

**There aren’t many specific regulations; the main requirement is that the accuracy must be no less than 0.1. However, several points need to be taken into account when selecting and using such devices: 1. Try not to install measuring instruments at both the upstream and downstream ends. If it’s necessary to do so (for example, if both the supplier and the consumer install measuring instruments based on their own needs), an agreement should be reached in advance regarding which instrument will be used as the primary measurement source, and this should be specified in the contract. 2. Changes in the density of natural gas have a significant impact on the measurement values; therefore, it’s important to regularly check the density values. 3. When selecting a device, it’s better to opt for imported ones, such as Alstom turbines that come with temperature and pressure compensation functions (compensation can also be done via DCS systems). This is the type of device we use. Domestic devices suffer from excessive accuracy losses. That’s about all I can think of for now

It can only be tested for use in trade; it cannot be calibrated. **Only the statutory metrology authorities or authorized research institutions have the authority to conduct inspections and issue legally valid certification documents, which is necessary for you to be able to sell natural gas. If you have the money, buy a meter-grade mass flow meter – its performance is excellent!

When selecting and placing orders, focus on specifying accuracy requirements, and conduct regular inspections during use

You do not have the authority to conduct such calibrations; this falls under the category of mandatory calibration, and it must be taken to a designated metrology department for inspection. Moreover, depending on the type of measuring instrument, different calibration devices are used – for example, the calibration methods for mass flow meters and turbine flow meters are different. I am not very familiar with this aspect of calibration, so you might want to consult the local metrology supervision and inspection agency

By formulating calibration procedures for different flowmeters, establishing a standard system, and obtaining **authorization, it is possible to verify various performance aspects of flowmeters, such as the accuracy of key parameters, uncertainty, and hysteresis