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Corrosion & Erosion

Corrosion & Erosion

•   Turbine blade erosion can lead to decreased per-

formance and blade failure

•   Pitting may occur before vibration analysis can 

detect a problem

•   RVI can rapidly assess blade condition and equip-

ment can be scheduled for more detailed preven-

tative maintenance

•   See page 7 - 8 for general description

•   Sand erosion can occur at change in direction/

diameter in offshore production risers due to solids 

ingestion, typified by a smooth surface with a sand 

dune pattern

•   Riser locations where sand erosion may occur are 

difficult to access and inspect with conventional 

ultrasonic and X-ray testing

•   Permanently-installed sensors can be applied to

  suspect areas for accurate monitoring without the

  need for repeated mobilization of inspection per-

sonnel

•   See pages 15 - 18 for general description

•   HF unit flange integrity must be assessed per API 751

•   Manual flange opening and inspection nearly as 

costly as outright replacement

•   UT-PA imaging can significantly enhance detection 

and sizing of flange face corrosion damage for 

  replacement prioritization for turnaround

•   Proven to be accurate and cost effective over 

  conventional inspection methodologies

•   See pages 9 - 10 for general description

•   Insulation and fireproofing can accumulate 

  moisture and cause accelerated corrosion

•   Breaches of weather jacketing increases with age 

and mechanical damage

•   Extensive stripping and abatement needed for 

visual testing and ultrasonic testing

•   Digital X-ray can give general condition a specific 

thickness in recordable format for prioritization of 

  additional inspection/remediation can be scheduled.

•   See pages 11 - 12 for general description

•   Heat exchanger tube problems can cause unit 

  outages and environmental impact

•   Damage can occur suddenly (titanium tube 

  support plate wear after 2 weeks of above design 

flow conditions) or longer term

•   RVI can provide internal condition. Leak testing 

does not provide volumetric assessement

•   ET is preferred method of tube inspection for non-

ferrous alloys

•   See page 13 for general description

•   Hydrogen damage can be caused by condenser in 

leakage and failures can lead to unit outages

•   External UT/EMAT scanning can be used to identify 

suspected areas of wall loss

•   RVI can rapidly confirm external inspections for 

exact location and severity of boiler tubes for ID 

damage

•   See pages 7 - 8 for general description

Radiographic Testing (RT)

Eddy Current Testing (ET)

Remote Visual Inspection (RVI)

Remote Visual Inspection (RVI)

Ultrasonic Testing (UT)

Ultrasonic Phased Array (UT-PA)

Industrial environments will promote significant corrosion 
of carbon steel piping components

Heat exchanger tubing can suffer specific damage that 
can be precisely qualified by ET

Localized corrosion damage in carbon steel can be con-
firmed using visual methods

Catalyst and solid can cause severe damage to rotating 
and stationary blades

Solid particles can generate rapid wall loss under proper 
conditions in offshore risers

HF scale and corrosion can significantly compromise 
flange integrity