VOLUMES
Tickets, provings and gas calculations done the way the standards set them out: the same calculation sequence, the same number of decimals at each recorded step, and a meter-factor history that re-runs the affected tickets when a factor moves.
First-release scope. This page describes what the first release of Converge HCA covers. Book a demo to see what is ready today.
Standards: the measurement engine is being built to API MPMS chapters 4, 5, 11.1, 12.1 and 12.2, AGA Reports 3, 7, 8 and 9, ISO 5167-2, GPA 2172 and ISO 6976:2016. We will list a standard as implemented only once its published worked examples pass in our test suite.
WHAT IT DOES
Measurement is where the accounting numbers start. A liquid ticket takes the opening and closing meter readings, corrects the indicated volume for temperature, pressure and meter performance, and takes out sediment and water to give net standard volume. Converge HCA records each step to the decimals the standard sets and rounds it once, so the ticket gives the same answer every time it is recalculated.
Meter proving produces the meter factor the tickets use. Converge HCA calculates it by the average-data or the average-meter-factor method, checks repeatability and keeps each meter’s factor history. A factor outside its limits is refused, and a change of more than 0.0025 between provings takes the meter out of service, applies the average back to the last good proving and re-runs the affected tickets as adjustments.
Gas volumes are corrected to base conditions with compressibility from AGA-8 DETAIL or GERG-2008, and the gas analysis gives heating value, relative density and Wobbe index at the reference conditions your contract names. Volume and heating value are never combined across different bases.
KEY CAPABILITIES
The ticket sequence, step by step.
Static tank quantities from the gauge.
Meter factors you can defend.
Line volumes to base volumes.
Composition to heating value.
One rounding policy, applied once.
WORKFLOW
Meters with their K-factor history, provers with their certificates.
Proving runs give a meter factor, checked for repeatability and against the last one.
Meter and tank tickets, calculated in the standard’s sequence.
Compositions give heating value and density for the month.
Refused factors, out-of-range inputs and expired certificates go to an owner.
Net volumes become the measured totals that allocation shares out.
CONNECTED MODULES
FAQ
No, and we will not say it is. The engine is being built to the standards and tested against their published worked examples. A standard is listed as implemented only when those examples pass.
Because a ticket must reproduce exactly. The standards set the decimals at each recorded step and the order of the calculation. Rounding at a different step changes the net volume, and the difference turns up later as an unexplained variance.
A change of more than 0.0025 between provings takes the meter out of service. The average factor is applied back to the last good proving, and every affected ticket is re-run as an adjustment, so nothing is edited in place.
The ones your contract names. Every quantity is stored with its unit and base conditions, in field or SI units, for example 60 °F and 14.696 psia, or 15 °C and 101.325 kPa.