Oil & Gas

Oil & Gas

BTI builds balancing systems for oil and gas rotating equipment — pump impellers and rotors, centrifugal compressor wheels, turbo-machinery shafts and the electric motors that drive them. Equipment here runs continuously in remote locations, which moves the whole balance conversation toward reliability rather than throughput.

What BTI Balances in Oil & Gas

BTI balancing machines are built on four platforms — VNR (vertical non-rotator), H (horizontal cradle), VR (vertical rotator) and P (platform suspension) — plus tool holder balancers, spinners and test stands. The platform follows the part geometry and how it has to be held; the correction method follows the material and where there is room to add or remove mass.

How a Machine Gets Sized

A BTI machine designation names a platform and a class. A P-5 is the platform suspension base, class 5. The number is a class, not a part weight limit — it describes the size and load envelope of the base.

Sizing works from the tooling and the part together, not the part alone. Tooling is not specified until the part prints are reviewed and the fixture is concepted, and the heavier the tooling-plus-part assembly is relative to the class, the less repeatable the measurement becomes. A shop that needs one machine to cover a wide range of parts, and does not need tight repeatability, can run a much broader weight range on a given class than a production program can.

Tell BTI the part weight and BTI will name a class the same day. See BTI machine platforms for the full platform and class architecture.

Balance Grade and Tolerance

Balance tolerances are set by ISO 21940-11, which superseded ISO 1940-1. The standard assigns a balance quality grade G, and the permissible residual specific unbalance follows from that grade and the service speed:

e_per = (G × 60) ÷ (2π × n)

where e_per is permissible residual specific unbalance in g·mm/kg, G is the balance quality grade in mm/s, and n is the service speed in rev/min. Permissible residual unbalance is then U = e_per × m, divided across the correction planes.

Work out a specific tolerance with the ISO balance tolerance calculator.

Balancing for Uptime

The economics of a remote installation invert the usual argument. On a production line a tighter balance tolerance is weighed against cycle time; on a compressor station it is weighed against the cost of an unplanned shutdown and a crew mobilisation. That pushes oil and gas work toward tighter grades than the component alone would suggest, and toward machines that the site’s own people can operate and maintain.

Correction Methods

Standards

BTI certifies machines to ISO 21940, SAE International balancing specifications, and DIN specifications. Where a program carries a measurement system capability requirement, BTI evaluates the part and the process first, then confirms what is achievable and commits to it in the machine specification.

Frequently Asked Questions

Why do oil and gas rotors often carry tighter balance tolerances than similar industrial parts?

Because the cost of failure is dominated by downtime and access rather than by the part itself. A tolerance that is economic on a factory floor may not be economic on a remote installation.

Can BTI supply equipment for field service and remanufacturing?

Yes. Standard-model machines are built for shops that need range and serviceability, and BTI rebuilds and retrofits existing balancers including other manufacturers’ machines.

Does BTI rebuild or retrofit existing balancing machines?

Yes, including machines built by other manufacturers. See BTI rebuilds and retrofits, competitor rebuilds and retrofits, and PC upgrades.

How are BTI lead times quoted?

Lead times are quoted in weeks at the time of quotation. They move with current backlog, so BTI confirms the schedule for a specific machine as part of the quote rather than publishing a fixed figure.

What information does BTI need to quote?

The part print, the part weight, the service speed, the balance tolerance if one is specified, and the required production rate.

Related applications: pumps, fans, impellers and blowers, turbochargers and superchargers, armatures, rotors and motor assemblies. Related equipment: balancers.

Browse BTI balancing machines or request a quote.