For boilers that are not scaffolded, our TubeCAT
"wall-crawler" can be used to carry the "E-PIT" probe up the
water wall. The crawler can handle water walls up to 200' height
and tube sizes from 1.5" to 3.5".
Inspection speed is 10'/minute so an entire wall, 100' high
and 100 tubes wide, can usually be inspected in less than 3-12 hour
shifts. The E-PIT probe inspects the flame side of the tube
to within 1/4" of each web, using>16 detection coils for
high precision. Pits as small as 1/8" diameter can be
detected.
To inspect a boiler in the most efficient manner, a
VertiScan
System can be used. In this configuration, the E-Pit probe
head interrogates five tubes at once, allowing one entire
wall to be inspected within a 12 hour shift. Three sensors
per tube inspect mainly the crowns. The VertiScan System detects gradual, tapered
thinning as well as highly localized corrosion and erosion,
internal and external.
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