Eddy Current Inspection Services of TWISTED TUBE Heat Exchangers

Services Division Application Brief

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IntroductIonDuring the last 20 years, Koch Heat Transfer Companys TWISTED TUBE heat exchangers have made their way into the refining, petrochemical, and chemical industries. TWISTED TUBE heat exchangers come in a variety of sizes, from 3/8 to 1 1/4 in diameter, with material types such as stainless, titanium, brass, monel, carbon steel, duplex, and nickel just to name a few. One advantage of utilizing TWISTED TUBE heat exchangers is the absence of baffle supports, which allow them to have the highest heat transfer coefficient of all tubular heat exchangers (up to 40 percent higher). Recent innovation and development of new technology such as the twisted probe has evolved greatly over the last two years thanks to collaboration with other industry leaders.

The inspection of shell-and-tube heat exchangers is commonly performed with Eddy Current Testing (ECT), which can be used on non-magnetic (nonferrous) and slightly magnetic alloys that are conductive such as: stainless, brass, titanium, hastalloy, Inconnel, etc. Eddy Current Testing can detect small defects such as stress corrosion cracking and has been successful in the inspection of such important assets.

Approved ServIce provIderMISTRAS Group is the only approved vendor that provides highly qualified, trained Eddy Current technicians for the inspection of TWISTED TUBE heat exchangers utilizing this new inspection technology. This includes on-site and in-house data analysis, utilizing the most advanced state of the art software for ECT (Eddyfi Ectane system and Magnifi software).

This equipment allows the technician to accurately and confidently inspect twisted tubing in real-time, by enabling full-length recording capabilities. This allows data analysis offline to assess damages with the customer.

reQuIreMentS And SIte prepArAtIon Tubes must be cleared of all I.D. loose scale and deposits Hydro-blast (10,000 to 25,000 psi / depending on material type) is common practice 110 AC power supply Customer safety requirements in plant or unit Tube information is critical (U-1 Spec. Sheet) to assure proper equipment is used for project

Eddy Current Inspection Services of TWISTED TUBE Heat Exchangers

FeAtureS Inspection of non-ferromagnetic tubing, such as stainless, brass, titanium, etc Can distinguish between I.D. and O.D. defect orientation Defect location distinguishes whether defect is in outer crest or lower dip of twisted tube Sensitivity to gradual wall loss, corrosion, pitting, erosion, cracking, and more Can Inspect .750 up to 1 diameter tubing (smaller or larger tube diameters require special probe design)

BEnEfITS Increased efficiency thanks to high rate of inspection (60-80 tubers per hour) Repeatability allows for comparing historical test results to establish corrosion rates and remaining life Quality work thanks to highly trained and qualified ECT technicians

reportInGA 2D and 3D formal report contains a cover sheet, table of contents, introduction, executive summary, tube sheet layouts, data summary sheets, detailed data sheets, & graphic printouts.