My LNG volumes in SAP Tank Management are way to large, how can this be?

As capacity UoM, the tank master data in SAP Tank Management (transaction O4NA) requires usage of a UoM of dimension VOLUME. Thus, you define e.g. M3 (cubic meter, m³) as capacity UoM.

If you now perform a tank dip, utilizing your strapping data values in M3, the mass and energy quantity values calculated by the system are too small when compared to the apparent liquid LNG M3 value calculated from strapping – or, the volume quantity value in M3 (or any other UoM of dimension VOLUME) appears to be too large in relation to the mass quantity values  and energy quantity values.

Reason: For all LNG template conversion groups, the UoM assigned to dimension ID VOLUME (e.g. M3) represent the “theoretical” volume of the  LNG  once regassified! The UoM assigned to dimension ID VOLLIQ (e.g. M3L) represent the liquid volume of your LNG, as measured in your tanks. However, SAP Tank Management does not allow definition of the capacity with UoM of DIMID VOLLIQ, e.g. M3L.

Thus, if you utilize SAP Tank Management for LNG, you must redefine the meaning of the SAP Dimension ID VOLUME, such that the liquid LNG volumes are calculated for the UoM assigned to dimension VOLUME (and the optionally calculated gaseous volumes are assigned to UoM of e.g. dimension VOLGAS). It is then important to utilize this re-definition consistently in your implemented processes.

This is demonstrated via BCG template conversion group QUCE:

Add marker function to confirm dimension switch:

Test Calculation:

The M3 value is the LNG liquid volume (at observed -159.5 °C), M3X is the liquid volume (also of dimension VOLUME) at fixed temperature -165 °C, M3Y is the (theoretical) standard gas volume (ISO base conditions) that one obtains if the 10 000 m³ (M3) are regassified; MBD and GJ1 are energies. One MBD is one million BTU(IT) at 60 °F combustion, superior and one GJ1 is one Gigajoules at 15 °C combustion, superior. TO is the LNG mass in metric tons.

It is strongly recommended that QuantityWare certified BCG consultants perform such re-configurations and are involved in all LNG configuration projects.

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