QCI Calculation Routines

[Former Member]

I have a material, which in the material master is defined for conversion from KG to GLL. The ratio is 4.177 KG per GLL. For 100 KG this would come to 23.94062 GLL.

This is an HMI material, and has relevance in the IS-OIL module. Using the QCI desktop calculator 100 KG of the material comes to 24.57500 GLL - obviously corrected by some factor.

Our system implements RFC calls to the ASTM C-Routines for volume correction factors. Using transaction O3D0 I can see that for the conversion group, the material is maintained at 60 F, API density of 0. On the report the volume correction factor is 1. So I would expect the material master conversion to be the same as QCI.

What other factors could be contributing to the QCI calculation?

Thanks.

[Former Member]

HI Brian,

Difficult to know exactly without seeing your system of course.

I assume that GLL is a version of Gallons(?) which you've configured.

Are both the Air Bouyancy Indicator and the Hydrometer correction indicator switched off?

These would both alter the result, though I'd be surprised if the difference was as large as you are experiencing.

The density in your original post looks like a typo. It would be interesting to know what it actually was.

Also, which conversion group is being used for the material in the material master.

Do you get a similar result if you use a larger quanity (e.g. 100,000 KG).

This would be interesting to see if it is a rounding difference.

[markus_seng2 · Accepted solution]

Dear Brian,

I assume that you are utilizing the standard "out-of-the-box" SAP QCI, which implements exactly one conversion model between different quantities (volume & mass).

We have described this and all other models possible here:

http://www.quantityware.com/_data/QuantityWare_MQCI_SP12.pdf

[markus_seng2]

Dear Brian,

I assume that you are utilizing the standard "out-of-the-box" SAP QCI, which implements exactly one conversion model between different quantities (volume & mass).

We have described this and all other models that are common in the industry here briefly:

http://www.quantityware.com/_data/QuantityWare_MQCI_SP12.pdf.

Your specific issue is that you define in the material master a fixed density relation via the GLL to KG figure.

An API gravity of 0 (which is a valid density) at 60°F corresponds to a density of 1074,99 kg/m3 at 60°F. Using the standard SAP QCI model 100 kg then convert to approx. 0,093023 m3, which then convert to 24,574 GLL accoring to our QuantityWare Petroleum Measurement Cockpit : http://www.quantityware.com/_data/QuantityWare_PetroleumMeasurementCockpit_SP12.pdf

The material master density (your kg to GLL ratio defined in the material master, which you can also convert to a kg/m3 density, which is different from 0 °API ) is always ignored within the standard SAP QCI and the density defined e.g. in the default sets, here 0 °API is taken.

To make a detailed analysis, onw would have to take a specific look at your implementation, taking into account the measurement standards defined by your business, the rounding of intermediate results and so on ...

Here, http://www.quantityware.com/product/index.php?rubric=33 may be of interest for you in the future.

I hope this helps a bit,

Kind regards,

Markus