
Nondestructive testing has been defined as comprising those test methods used to examine an object, material or system without impairing its future usefulness. Nondestructive testing is used to investigate the material integrity of the test object. Non-destructive testing is used to detect abnormalities in physical, chemical or electrical characteristics.
Showing posts with label Visual Inspection Ndt Testing. Show all posts
Showing posts with label Visual Inspection Ndt Testing. Show all posts
24 September 2013
23 September 2013
19 September 2013
Testing Requirements
The luminance at the surface shall be minimum 500 lx. If required to obtain a good contrast and relief effect between imperfections and background, an additional light source should be used.
For performance of direct inspection, the access shall be sufficient to place the eye within 600 mm of the surface to be inspected and at an angle not less than approximately 30degree. If not otherwise agreed all weld connections in question should be 100% visually inspected.
The testing volume shall as a minimum cover the zone which includes welds and parent metal for at least 20 mm on each side of the weld. In case of doubt, visual testing should be supplemented by other non-destructive testing methods for surface inspections.
The weld surface shall be free of weld spatter, slag, scale, oil, grease, heavy and loose paint or other surface irregularities which might avoid imperfections from being obscured. It can be necessary to improve the surface conditions e.g. by abrasive paper or local grinding to permit accurate interpretation of indications.
originally found here:- http://www.ndtindia.org/visual-inspection.html
18 September 2013
Visual Inspection Equipment
The following equipment
may be needed:
·
Mirrors (especially
small, angled mirrors)
·
Magnifying glasses, eye
loupes, multi lens magnifiers, measuring magnifiers
·
Microscopes (optical and
electron)
·
Optical flats (for
surface flatness measurement)
·
Borescopes and fiber
optic borescopes
·
Optical comparators
·
Photographic records
·
Closed circuit
television (CCTV) systems (alone and coupled to borescopes/microscopes)
originally found here:-http://www.ndtindia.org/visual-inspection.html
Services for Visual Inspection
·
Inspection of suspicious
areas
·
Predictive maintenance
applications
·
Full inspection
recording
·
Consultancy Service
·
Reports
·
Training
originally found here:- http://www.ndtindia.org/visual-inspection.html
7 September 2013
Visual Inspection
Visual Inspection
Visual Inspection is one of the most widely used Non-Destructive Testing methods for the detection of discontinuities before they cause major problems, e.g. poor welding, surface defects, corrosion pits, general condition, degradation, blockages and foreign materials.Visual Inspection means the inspection of equipment and structures using a combination of human senses such as vision, hearing, touch and smell. Visual Inspection is sometimes carried out in conjunction with devices such as a low power magnifying glass, boroscopes, fiberscopes, digital video borescopes, camera systems and robotic crawler systems.
originally found here:- http://www.ndtindia.org/visual-inspection.html
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