meter proving

Meter Proving & Meter Testing: The Subtle Differences

Meter proving and meter testing are very different. This is why.

Meter proving whenever a meter prover samples and confirms the consistency of a meter regardless of whether digital (aka SMART) or analog, each meter is different though, because of this where meter proving is carried out one could expect a variety of outcomes whilst making use of various ways of testing. For example a propane gas meter prover tests the correctness of the propane meter. Numerous meter provers choose to test their received data with a preset array as laid out inside of his or her guides.

According to Harvest, a Peace River chemical cleaning company in Alberta, meter proving is a science. A battle of keeping current and accurate against your competitors.

Meter proving is the method for determining a correction issue (i.e. a meter factor) to modify the measured numbers for errors as a result of setup and working points. Meter proving is carried out by checking the service meter to a certified prover (dynamic or tank prover, master meter) that is trackable to a national meteorology institute along the lines of NIST. Among the many popular sorts of proving is actually for fluid hydrocarbon and this is especially the situation within pipelines carrying the gas.

“Special prover connectivity are necessary right at the metering station enabling parallel measuring of the liquid in the two devices.” states Jeff, a Calgary oil and gas plant maintenance manager.

meter1 - Meter Proving & Meter Testing: The Subtle Differences
Image used with permission from IntricateMeter Proving

As early as the early 1900s, bell provers are generally the most common reference standard used in gas meter proving, and has provided standards for the gas trade that’s unfortunately sensitive to many incomputable issues.

Gas provers test gas meters and they are without doubt the majority of meters out there. Provers are commonly utilized in gas meter maintenance institutions, domestic gas meter shops, and public works shops. The system in which meter proving experts analyze the correctness of a meter is through driving air through and after that analyzing those outcomes to the meter’s own inner displacement. The prover then presents a proof, a rate conveyed as a percent which compares the quantity of air passed with the volume of air calculated to identify the meters precision.

Video courtesy of Petroleum Extension

A bell prover generally consists of the vertical inner reservoir encompassed by an outer shell. A space involving the inner tank and outside shell is filled with a sealing liquid which is normally oil. An upside down reservoir, called the bell, is set over the inner tank to make a fluid seal. Bell provers are frequently counter-weighted to give positive pressure level through a hose and valve connected to a meter. We often see rollers for the bell that allows for soft linear movement without having the threat of ruining the stress produced by the bell seal shifting.

With this really technical area one might not expect errors nevertheless it interestingly isn’t really all that unusual. Temperature inconsistencies between the bell air, meter and connected pipes might be the cause of most meter proof errors. There are a laundry list of things to go wrong that need to be regarded like human error and hardware issues.

“Meter testing” in natural gas orifice measuring frequently involves a visible examination of the equipment for leaking or installation deficiencies; inspecting the orifice plate; and, when necessary, calibrate the temperatures, static pressure level, and differential pressure level sensors. There are certainly numerous different methods of testing including gas quality, ultimately meter testing never compares measurements/data to a primary reference device. One exception to this rule nevertheless is the seldom made use of orifice meter testing which does command referencing primary devices versus the field data acquired from field provers.

meter2 - Meter Proving & Meter Testing: The Subtle Differences
Image used with permission from IntricateEnergy Services Company

So there you have it, this is just how meter testing is accomplished and the subtleties of the work involved by meter provers in the field and inside computerized components.