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, an energy management consultant with QuotEnergy.

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Image used with permission from Intricate

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 calibration in Grande Prairie 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.

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Image created by Energy Services Marketing

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.


Meter proving takes place when a prover tests and confirms the quality of a meter irrespective of whether computerized (aka SMART) or analog Every single meter is different nonetheless, for this reason whenever meter proving is completed you could expect various outcome whilst making use of various techniques of examination.. Basically, it is a gas meter prover for gas meters.. Numerous meter provers prefer to assess their results up against a set range as shown inside their guides..

The terms “meter proving” and “meter testing” are often made use of interchangeably, however, for the record, the difference amongst proving and testing a meter is actually substantial and important to understand.

When an experienced professional is validating the correctness of the meter this is what’s called meter proving. Factors like determining the ideal volume of disbursement to the meter results itself. After the data has been collected from the meter proving professional, he/she then contrasts that data to domestic meteorology data widely available through institutions like the National Institute for Standards and technologies. Among the more popular types of proving is actually for liquid hydrocarbon and this is really the situation in pipelines transporting the gas. Specialized prover connections are necessary for the metering station allowing parallel measurement of the fluid in both the devices.

Although meter testing has been available for more than 100 years the exact same standard prevails nowadays as it did in the past. This makes testing thru this method is vulnerable to numerous different variations and insecurities.

And then there are now the more widespread gas meter proving professional who checks and confirms gas meters.The many uses of gas provers would be those from municipalities and public works.The procedures through which meter proving specialists sample the accuracy of a meter simply by driving air through then contrasting those outcome to the meter’s own inner displacement. Subsequently the prover examines the percent of air transferred through the meter employing the air determined according to the meter itself.

A bell prover generally consists of the upright inner reservoir encompassed by an outside layer. There’s two layers and while the outside layer is typically filled up with oil, the interior layer is called the bell. The fluid is there to act as a air-tight seal for testing. Bell provers are ordinarily counterweighted to supply positive pressure level through a hose and valve linked to a meter. We frequently see casters on the bell that enables soft linear movement without danger of jeopardizing the pressure produced by the bell seal moving.

Bells provide a quantity of air which has been preset by calculated temperatures, pressure level also, the effective diameter of the bell. This is the thing, bell scales are created for a specific bell and cannot be put on Some other. anytime proving a meter operating a manually managed bell, an operator have to first off fill the bell with a controlled air source or increase it manually by cracking open a valve and tugging a chained mechanism, seal the bell and meter and examine the sealed system for leakages, determine the flow rate needed for the meter, apply a specific flow-rate cap on the meter outlet, observe the starting off points of equally the bell scale and meter index, release the bell valve to move air through the meter, observe the meter index and evaluate the time it takes to move the fixed volume of air, then manually evaluate the meter’s proof accounting system for bell air and meter temperatures and in some instances Some other environmental facets.

technologies has advanced a great deal now, with the invention of PLCs (Programmable Logic Controllers), repair shops can possibly automate the bell proving process. This is realized via computerized techniques of raising and lowering the bell prover. Temperature, pressure, and dampness sensors could be utilized to feed data into an computerized bell PLC, and calculations for meter proofs could be handled by a computer or electronic device developed for such a function. In the early 1990s, the PLC was swapped by PACs (Programmable Automated Controls) and modern computer systems. Later on detectors had been incorporated that evolved automation further and getting rid of a significant proportion of the “human factor” during testing.

As you could possibly gather from this document, meter testing/proving is a highly complex procedure based on many variables.