News

ISO 6578 “Refrigerated hydrocarbon liquids — Static measurement — Calculation procedure” has been released as a new version in October 2025 with the designation ISO 6578:2025.
This third edition cancels and replaces the second edition (ISO 6578:2017), which has been technically revised.

1. As stated in the new version, the main changes are the alignment with ISO 6976:2016 physical property data and that calculation examples have been moved from the main body into an Annex.
2. In addition, calculation data in various Annexes are now designated as “informative” and not as “normative” any longer. This apparently reflects the current global business practise of signing medium and long term LNG delivery contracts which contain various sets of calculation data for the revised Klosek-McKinley equation. Since QuantityWare BCG allows the definition of customer specific data sets for ISO 6578 LNG or LPG density calculations, QuantityWare BCG implementations for LNG are compliant with ISO 6578:2025.
3. For LPG, the alternative density calculation models (Francis equation and COSTALD routine) are both not referenced (as informative) any longer. The simplified density calculation formula is provided with molar volume data (at 15 °C, only) as informative data. This density calculation formula may be combined – for LPG with less than 20 % unsaturated hydrocarbons – with the ISO 91:2017 LPG volume correction factor standards (i.e. GPA 8217 / API MPMS Chapter 11.2.4).
4. For LPG with more than 20 % unsaturated hydrocarbons, no guidance is apparently available (as both the Francis equation and COSTALD routine are no longer referenced).

In August 2025, the API has published API MPMS Chapter 11.5.1 – Errata 2 . QuantityWare experts have carefully analyzed this errata and confirm that the correction defined in that errata has been implemented proactively in the BCP implementations since 2009.

QuantityWare is preparing the release of QAPI in Q4 2025.

Detailed documentation is now available via the Knowledge Base and FAQs on this website to allow customers to gain first impressions.

About QAPI

QAPI is an Application Program Interface (API), which extends access to the bulk quantity calculations in QuantityWare’s Bulk Calculations Solution (BCS) to any system, anywhere in a company’s landscape.

The outcome is a single set of trusted and verifiable bulk quantity conversions, which can be used across an enterprise.

QAPI Release

QAPI will be included in the following Q4 2025 BCS CSP Releases:

• • ECC Systems: BCS 30A CSP-004
  • S/4 HANA Systems: BCS 30B CSP-003

QAPI will be available for QuantityWare customers.

API MPMS Chapter 12.2 “Calculation of Petroleum Quantities Using Dynamic Measurement Methods and Volumetric Correction Factors”, has been released in August 2025 as 3rd Edition. QuantityWare has carefully analyzed this important calculation model standard. With respect to a calculation result impact on the supported QuantityWare BCS calculation models, this new edition of API MPMS Chapter 12.2 does not deliver any relevant changes.

Today QuantityWare has published the Release Notes for the BCS 30A CSP-004 / 30B CSP-003, which will be shipped in Q4 2025. The Release Notes document can be found in our knowledge base.

ASTM D1550 “ASTM Butadiene Measurement Tables” has been revised and re-approved in July 2025. QuantityWare has carefully analyzed the new version and confirms that the BCP implementation of ASTM D1550-18 is also compliant with the 2025 re-approved version ASTM D1550-25. With the next CSP, the compliance relevant BCS documentation and technical text updates will be delivered.

GPA 2172 has been reaffirmed and published as GPA 2172-25. QuantityWare confirms that BCG implementations for dry natural gas, that are based on the previous GPA 2172-19 version, comply with this new version.

From May 12th to May 16th, the QuantityWare BCG certification training took place.

The highly interactive BCG training course covers the full capabilities of the QuantityWare BCG product within the BCS solution.

After course completion, all delegates presented their configuration results to QuantityWare experts. QuantityWare welcomes the new BCG certified  consultants to our growing BCS network.

In Mai 2025, API MPMS Chapter 9.1 ”Density Determination, Section 1-Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method” – ASTM D1298 has been revised and issued as ASTM D1298-24. QuantityWare has reviewed this new version and confirms compliance with BCS 3.0 implementations for hydrometer correction calculations.