Eddy Current Testing in Petrochemical: What It Finds, What It Misses, and What Governs It
What ET is actually used for in petrochemical
Cracker and polymer plant exchangers carry large non-ferrous bundles where bobbin eddy current is the only practical way to establish tube condition inside a shutdown window.
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 petrochemical assets this applies to
Crackers and their furnaces, polymer trains, reactors and columns, compressor stations, and the utilities and storage that support them.
The damage mechanisms driving the examination
High-temperature degradation dominates — creep and carburisation in furnace tubing, thermal fatigue at cyclic services — alongside chloride stress corrosion cracking in austenitic systems and erosion in catalyst-handling circuits.
What governs acceptance
API in-service codes with ASME construction acceptance, plus process-specific licensor requirements that frequently exceed the code minimum on critical equipment. 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 · Petrochemical programme consulting · Petrochemical NDT training · scope a ET examination.
ET in other sectors
Refining · LNG · Offshore · Pipeline · Marine & Shipbuilding · Aviation & Aerospace.