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Field Audits/Assessments

Whether assessing one station, a group of stations, or an entire pipeline system, we can design testing plans, protocols, and provide the project management to help you assess your measurement risk. We tailor your site assessments to focus on any or all of the following areas, evaluating your equipment with respect to applicable measurement standards and industry best practices by:

  • Reviewing Historical Flow Data
  • Reviewing Calibration Reports and other data
  • Witness station testing activities
  • Assessing meter installation uncertainty
  • Assessing meter diagnostics
  • Assessing secondary devices such as P, T, and flow computer installation
  • Assess calibration equipment
  • Assess gas chromatograph and/or sampling system

These tasks facilitate an complete assessment consisting of a three stage process.

Stage 1 - Data Review

Initial review of the data enable development of custom assessment plans to identify high risk stations and prioritize necessary site assessments.

Stage 2 - Site Assessments

Physical site assessments of meter stations are needed to confirm the factors indicated during data review. Field assessments can identify or exclude specific factors contributing to LAUF. CMS uses API, AGA, and ANSI industry standards in field assessments.
  • API 21.1 & 21.2
  • API 14.1 & 14.3
  • AGA 3, 7 & 9
  • ANSI 2530

Stage 3 - Recommendations

Our team reviews the information provided by the raw data as well as the field assessment. Our technical depth & years of field experience enable us evaluate the overall station performance and categorize findings, ranking them from simple to complex. Dependent upon your needs, CMS can provide simple reports with comparisons to standards and best practices, uncertainty modeling, and/or detailed reports including recommendations with regards to both CAPEX and OPEX improvement opportunities.


Identification of Installation Effect

Large Ultrasonic Meters are responsible for the measurement of millions of dollars’ worth of gas. A customer contacted CMS stating that they thought they had an issue with a meter, but couldn’t prove it. Their system balance indicated the meter was over-registering the flowrate. CMS personnel visited the facility and immediately noticed a possible installation effect. A further evaluation of the meter’s diagnostics (and comparison to the calibration diagnostics) proved the hunch was correct. The CMS engineer was able to combine his experience and the evaluation of the meter diagnostics to provide the client with a defensible reason to change their system.

Recognition of Procedural Errors

A producer with a LACT unit measuring crude oil was having difficulties proving the meter. Industries standards include repeatability requirements, and even after 50 runs, the meter would not meet these requirements. CMS personnel visited the site and witnessed the provings. There were several issues with the procedures being followed that increased the variability of the provings. With CMS recommended changes to the procedures, the meter was able to be proven on a much more consistent basis.

Understanding of Actual Issue

A processing facility was having difficulty measuring a light liquid hydrocarbon. There were issues with the system balance and proving of the turbine meter. CMS personnel visited the facility and analyzed the measurement and proving data. The user was assuming there was a problem with the meter. However, the CMS analysis showed that through their procedures and calculations, they were not adequately adjusting for the change in density of the fluid. If CMS would not have been involved, the customer would have replaced the meter with another meter type, and would have still had the exact same issues.

System Balance Analysis

System Balance Analysis (LAUF)

Whether producing, transporting, selling, buying, or using oil and gas products, what goes into the system equals what leaves the system. In short, what comes in must equal what goes out.

System Balance Analysis

Flow Algorithm Verification

Whether you are a manufacturer and/or end user, ensuring the accuracy of the flow algorithms implemented in flow computers and measurement systems is fundamental to measurement integrity.

System Balance Analysis

Allocation Measurement

Allocation - the act of distributing by allotting or apportioning; distribution according to a plan.

Field Audits/Assessments

Measurement Engineering Services

Measurement performance is a compilation of many factors, beginning with station design, equipment selection, calibration, installation, start up & commissioning.


Colorado Facility
54043 County Road 37
Nunn, Colorado 80648

Iowa High Flow Facility
2365 240th St.
Garner, Iowa 50438

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