How to calculate corrosion coupon area

How to calculate corrosion coupon area

CALCULATION AREA OF CORROSION COUPON REFER TO STANDARD NACE, ASTM, ISO :

WE USE SAMPLE RETRACTABLE CORROSION COUPON 3″ X 1/2″ X 1/16″ CORROSION COUPON WITH 2 HOLE INSULATOR USING OUTSIDE DIAMETER INSULATOR 0.44″ DIAMETER .

WE NEED TO CLEARLY AND CLARIFICATION OF CORROSION COUPON AREA REF TO STANDARD IS EXPOSED AREA , AREA COVERED BY INSULATOR IS NOT EXPOSED AREA,

BELOW SAMPLE EQUATION BASE ON FORMULA ABOVE :

WE HOPE THE CALCULATION ABOVE WILL HELP ENGINEER FOR CORRECT CALCULATE CORROSION COUPON RATE ANALYSIS, REFER TO STANDARD. PLEASE MEASURE USING  CORROSION COUPON AREA EXPOSED DON USE NOT EXPOSED