Services Division Application Brief
Specications subject to change without notice. Copyright 2013
MISTRAS Group, Inc. All Rights Reserved. www.mistrasgroup.com
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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.
