NDT TRAINING METHOD IN CHENNAI
RADIOGRAPHIC TEST FILM INTERPRETATION (RTFI)
KEY TOPICS
Radiographs Quality.
Indication Identification & Acceptance criteria.
Inspection records
Radiographs Quality
Density.
Sensitivity.
Re-takes / Re shoots.
Density
The density limitation on the Any Project is 1.8 min and 4.0 max.
Densitometer
Sensitivity
Sensitivity in general refers to the size of the smallest detail that can be seen in a radiograph.
2% is the minimum required sensitivity on the any Project.
% IQI Sensitivity= Thickness of wire visible X 100 รท joint thickness.
Re-takes / Re-shoots
In principle area of interest of all RT films shall be free from mechanical, chemical, or other blemishes to the extent that they are not confused with the image of any discontinuity.
Fogging
Process marks
water marks
chemical strains
scratches
Finger marks
Dirtiness
static marks
Tears
Indications Identification & Acceptance criteria
Relevant indication
Only those indications which exceed the following shall be considered as relevant indications
0.4mm for thickness 3mm to 6mm
0.8mm for thickness 6mm to 50mm.
1.6mm for thickness > 50mm.
CRACKS
TRANSVERSE CRACK
LONGITUDINAL CRACK
SOLIFIDICATION CRACK