Eddy Current Testing in Pipeline: What It Finds, What It Misses, and What Governs It
What ET is actually used for in pipeline
Above-ground pipeline facilities — pump and compressor stations — bring exchanger and cooler bundles into eddy current scope alongside the mainline programme.
How ET works
Eddy current testing induces circulating currents in a conductive material and reads the impedance change a discontinuity causes. It needs no couplant and no contact, which makes it the fastest surface and near-surface method available — and, in tube form, the only practical way to screen thousands of heat-exchanger tubes inside a shutdown window.
What ET will not do
What ET will not do: examine non-conductive material, penetrate deeply (the effect is confined near the surface, more so as frequency rises), or produce results anyone can interpret without training — signal interpretation is the whole skill, and lift-off, edge effects and permeability variation all masquerade as indications.
The pipeline assets this applies to
Transmission and gathering lines, girth welds by the thousand, station piping, pig traps and the dig sites where inspection actually happens.
The damage mechanisms driving the examination
External and internal corrosion, stress corrosion cracking on susceptible coatings and soils, seam-weld anomalies in older pipe, and mechanical damage from third parties.
What governs acceptance
API 1104 for construction welding acceptance; PHMSA integrity-management regulation driving dig programmes; operator IMPs translating both into scope. On the method side: ASME Section V Article 8 for tubing; ASTM E243 and E571 for specific product forms; aerospace surface examination runs under NAS 410 with OEM technique requirements. An examination that is technically sound but performed outside the governing regime is not an examination anyone will accept, which is why the code family matters as much as the technique.
How Atlantis delivers ET in this sector
Atlantis mobilises examination teams to your site under Atlantis procedures with ASNT Level III oversight — we do not claim a depot or laboratory in every market, and say so plainly. What you receive is the examination performed to a qualified procedure, findings evaluated against the acceptance criteria your contract names, and records structured to survive a client audit years later.
Eddy Current Testing services · ET training and certification · Pipeline programme consulting · Pipeline NDT training · scope a ET examination.
ET in other sectors
Refining · Petrochemical · LNG · Offshore · Marine & Shipbuilding · Aviation & Aerospace.