Unit summary

A unit profile is a collection of units for each of the different categories of data.

For example, temperature is a unit category, and degrees Celsius is the unit.

Understanding Delivery Conditions

Wet and Dry gas is of special importance to gathering pipelines. When the gas comes out of the ground, it has a certain amount of water in it. This is called Wet gas. The water is usually removed as it is expensive to transport it (since the customers are paying for the gas not the water).

However, some gas is measured before the water can be removed. Therefore, AVEVA Measurement Advisor needs to be able to display the data in both Wet and Dry conditions. This value is stored in a column called Water Vapor Correction Factor (WVCF).

Volume calculations are a function of how you have configured AVEVA Measurement Advisor, flowing conditions, and the physical composition of the gas (gas quality). When displaying a wet volume, we need to know if we should apply the WVCF to the volume or the heating value from the gas quality (GQ). This depends on whether or not the water was removed before the GQ data was analyzed and whether or not this was taken into account when calculating the volume. This is a property for each meter stored in the H2O Vapor Calculation > Apply water vapor correction to.

This is used in the following manner to display a Wet delivery condition:

If the Apply water vapor correction to is set to Volume:

• The displayed Volume is equal to the Stored Volume / WVCF

• The displayed Energy is equal to the Stored Energy / WVCF

• The displayed Heating Value is equal to the Stored Heating Value.

If the Apply water vapor correction to is set to Heating Value:

• The displayed Volume is equal to Stored Volume

• The displayed Energy is equal to Stored Energy * WVCF

• The displayed Heating Value is equal to Stored Heating Value * WVCF

  Note: Individuals with Meas Admin permissions will also have an ID column included in the Unit Summary.