GE Digital Cassettes Broschüre

Corrosion & Erosion

Corrosion & Erosion

•   Ring Joint flanges have had significant cracking 

from mechanical and Stress Corrosion Cracking

•   Typically discovered by PT or manual UT after 

flanges have been opened during Turnaround.  

May extend unit downtime

•   PA-UT significantly enhances detection and sizing 

of cracking damage while vessel is in service or 

just off line to allow for repair/replace planning

•   See Pages 7 - 10 for general description

•   API 653 mandates periodic internal tank floor 

inspection with volumetric assessment

•   Magnetic Flux scanners provide rapid general floor 

condition assessment

•   Phasor DM can rapidly “prove-up” scanning results 

with greater detail than conventional UT

•   See Pages 9-10 for general description

•   Instrument Penetrations have caused significant 

reliability concerns at nuclear plants

•   Difficult access and need for detailed inspection 

data required multi-modal approach for proper 

integrity assessment

•   Combination of RVI, UT and Eddy Current tech-

niques help assess BMI guide tubes to prioritize 

need for repair

•   See Pages 7 - 10 and 13 for general description

•   Reactor Effluent Air Coolers have suffered numer-

ous Erosion/Corrosion incidents due to Ammonium 

Bisulfide erosion and Ammonium Chloride corro-

sion

•   Rigorous monitoring of operating conditions must 

be followed by extensive UT and RT surveys

•   Rightrax installed sensors allow continuous or 

intermittent monitoring of suspect areas

•   See Pages 15 - 18 for general description

•   Extended downtimes and idle service water sys-

tems have promoted microbiological corrosion

•   MIC can be highly localized and cause complete 

penetration in short time periods

•   Use RVI or RT or both in complementary mode 

•   See Pages 7 - 10 and 13 for general description

•   Chemical and Process injection without proper 

control has been responsible for significant  indus-

try incidents

•   API 570 mandates enhanced inspections of spe-

cific locations downstream of these injections

•   Rightrax permanently mounted sensors can be 

installed in these locations and provide continuous 

thickness and profile readings in these locations

•   System installation can be responsive to process 

changes without deploying personnel resulting in 

increased data integrity at reduced costs

•   See Pages 15 - 18 for general description

Remote Visual Inspection/Ultrasonic Testing (RVI/UT)

Rightrax Installed Sensor (UT)

Remote Visual Inspection/Ultrasonic Testing (RVI/UT)

Remote Visual Inspection/Ultrasonic Testing (RVI/UT)

Ultrasonic Testing Phasor DM (UT)

Rightrax Installed Sensors (UT) 

Bottom mounted Instruments present a challenge for 
mechanical Integrity assessment.

REAC pipe condition can be continuously assessed regard-
less of process service conditions in typical operation

MIC can be highly localized and cause penetration in a 
short period of time

Ring Joint Cracking can be significant enough to neces-

sitate replacement.  PA –UT can be used to detect and 
size damage on line

 

Phasor DM can be used to accurately quantify the extent 
and severity of general wall loss detected in tank bottoms 
by global scanners

Rightrax sensors can be applied directly over an Injection 
Point area of concern and provide continuous wall thick-
ness monitoring