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BCG Configuration FAQs

Answers to common questions regarding configuring Bulk Calculations – Gas (BCG) on your systems

What options do we have for ISO 6578 LNG density calculations from composition?

QuantityWare BCG supports the ISO 6578 (Version 1991 and 2017) density calculations. As described in Note 000076, the main difference between these two versions is the definition of configuration data, i.e. the k1 and k2 factors and orthobaric molar volumes. Customers may wish to utilize their own, contractually defined, calculation data sets.

NOTE: This is a critical task for any LNG implementation, thus a certified BCG consultant is required to support this task.

You have three options to define the density calculations:

  • Utilize ISO 6578:1991 data –

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Which conversion group should I use for my high pressure pipeline natural gas project?

For high pressure natural gas projects, an MQCI conversion group should be selected. A certified BCG consultant can access the Gas Measurement Cockpit (GMC) and will follow the PAIG Methodology in order to create a selection of template conversion groups. The correct choice then depends on the detailed calculation scenario requirements which you will discuss with the certified consultant.

Example:

Template selection of high pressure conversion groups for AGA Report NO. 8 / ISO 6976 calculations:

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Which conversion group should I use for my LNG project?

For LNG projects, an MQCI conversion group should be selected. A certified BCG consultant can access the Gas Measurement Cockpit (GMC) and will follow the PAIG Methodology in order to create a selection of template conversion groups. The correct choice then depends on the detailed calculation scenario requirements which you will discuss with the certified consultant.

Example:

Template selection of LNG conversion groups for detailed ISO 6578 LNG calculations:

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We enter pressure values for gas calculations. Are these values absolute or gauge pressure values?

QuantityWare BCS implementations for LPG/NGL, LNG and natural gas support both the data entry of absolute and gauge pressure values. The conversion group configuration can be made to support entry of either gauge or absolute pressure values – by adding or removing dedicated MQCI pressure calculation functions to the conversion group function module sequence.

If you execute the Conversion Group Check, a message is issued that informs if pressure values (input data) are considered as absolute or gauge values.

Example 1: Template Conversion Group Q741:

Example 2: Template Conversion Group Q154:

Read Note 000078 for additional details.

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We receive error message /QTYW/BCG 114 - Heating value class is initial. How can we resolve this issue?

You perform quantity conversion calculations utilizing MQCI natural gas or LNG conversion groups. You receive error message /QTYW/BCG 114 – Heating value class is initial, enter a valid heating value class.

This generic message does not specifically explain why the calculation is not completing. It appears if the transaction UoM or any target UoM is not of an allowed SAP dimension ID – Energy, Volume, Mass (or Volume(Liquid, LNG)).

Example: Test Calculation for high pressure natural gas:

The calculation is executed successfully. Now we change the transaction UoM to KGA, which is assigned to SAP dimension ID weight (WGHTA):

The generic error message appears.

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I have set my quantity value UoM L15 and KG to be rounded to zero decimals, but it is not working. What can I do?

The UoM real rounding settings are considered for all MQCI conversion groups (where rounding function

/QTYW/MQCI_ROUND_ALT_QUANTITY

is assigned). To define the real rounding for a UoM, go to the PMC and navigate to: More -> Goto -> UoM Rounding:

and maintain the number of decimals for your UoM that shall be rounded accordingly.

NOTE: In the main UoM transaction CUNI, you define the number of display decimals for your UoM only. Thus, if you e.g. set the display UoM decimals in CUNI to 1,

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How can I extend the density and temperature range for my product?

I have a product which has a base density beyond the supported measurement standard range, is it possible to extend the calculation range?

If the algorithm defined in the measurement standards allows so, you simply extend the range for densities, pressures and temperatures by selecting the “Extend range of standard implementation” indicator in the conversion group details screen:

Read Annex D: Standard Range Limit Extensions in the BCP Supported Standards Manual for additional information.

Important: If you decide to set the “extend range of standard implementation” indicator,

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