Meter proving, LACT calibration, and custody transfer measurement for the energy industry's most demanding operators. Houston-based. Audit-ready. Trusted by operators across the Gulf Coast.
From the wellhead to the wing, MSI delivers the calibration, proving, and fabrication services that custody transfer demands — backed by NIST-traceable standards and API MPMS compliance on every job.
On-site meter proving, calibration, witnessing, and sampling/testing across upstream, midstream, and terminal environments.
Custody-grade meter runs, sampling systems, and integrated assemblies built and refurbished to API specification.
Scheduled proving intervals, drift detection, lifecycle asset management, and our nanoparticle mechanical cleaning process — the difference between an audit you pass and one you survive.
At roughly $92.35/bbl WTI, 0.1% error equals 100 barrels per day. Custody transfer measurement is not a compliance checkbox — it is revenue assurance, operational control, and risk management.
Small meter-factor errors compound across every batch, ticket, and settlement period. Proving protects both buyer and seller from silent value leakage.
Accurate meters help reconcile receipts, deliveries, inventory, and shrink. Bad measurement makes it harder to distinguish normal variance from real product loss.
Measurement drift can mask operational issues, delay leak detection, and create exposure during customer, regulatory, or internal audits.
Preset is jet-fuel base case. Adjust any number — the exposure recalculates automatically.
Formula: Throughput × Error % × Unit Price × Days. This is a commercial exposure estimate, not a forensic loss determination.
Every gallon of jet fuel loaded onto a commercial aircraft passes through a custody transfer meter that someone, somewhere, must prove. MSI is one of a handful of independent service providers in the World qualified to perform the recurring calibration work that airline fuel consortiums rely on.
Learn About Aviation Services
MSI's roots trace back to post-war Tulsa, Oklahoma, where John A. Halpine built Tank Service and later Halmor Meter Proving. This is one of the earliest third-party mobile meter proving operations, serving producers, pipelines, refiners, and marketers.
His son-in-law, Robert "Bob" Klasen, a returning WWII Marine Raider, learned the trade the old way: in the truck, at the meter, in the heat. In the 1960s, Bob carried that work to Houston, following the industry into the Gulf Coast energy corridor.
A few name changes later, MSI still serves airline fuel consortiums, pipeline operators, and refinery customers across Texas and our Nation. In 2026, MSI joined Praxis Custody Measurement Group, pairing decades of field knowledge with a platform built to scale.
Read the Full StoryA glimpse of the trade — past and present. Click any photo to see it full size.
Call us, or send the details — we'll respond within one business day, and have a tech on-site within seventy-two hours for most jobs across the Gulf Coast.
