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Reg. 265 c, Reg. 265 d, Reg. 266 a, Reg. 266 b, Reg. 266 c

(c) Magnetic particle flaw detection
Magnetic method of flaw detection shall be employed wherever possible for ferritic steel;



Reg. 265 d

Dye-Penetrant flaw detection

Dye-Penetrants or equivalent method for flaw detection shall be employed for Austenetic or other non-magnetic steel.


Reg. 265 e

(e) All butt welded joints shall be subjected to non-destructive examination by radiographic, radioscopy or other approved methods such as ultrasonic testing, magnetic particle inspection or liquid dye penetrant inspection.  When radioscopic examination is to be performed in lieu of radiography on welded components, the following requirements shall be met, namely:-

(1)     A written procedure shall be submitted for approval to the Inspecting Authority which shall contain the following:

(i)             material and the thickness range;

(ii)       equipment qualifications;

(iii)               test object scan plan;

(iv)               radioscopic parameters;

(v)                image processing parameters;

(vi)               image display parameters;

(vii)             image archiving requirements;

(viii)            accept-reject criteria (Code reference);

(ix)                performance evaluation;

(x)                 Operator identification.

(2)     The system shall be aided with an image processor to enhance the quality of the radioscopic images and system performance quality shall exhibit-

(i)                  a thin section contrast sensitivity of 3%;

(ii)                 a thick section contrast sensitivity of 2%;

(iii)               a spatial resolution of 3 line pairs per mm;

(iv)               IQI sensitivity - 2% of the joint thickness when wire IQI's are to be used, the wire diameter axis shall be oriented along the axis of the least sensitivity of the system.

(3)     Radioscopes are to be properly marked to co-relate with particular part of joint represented.

(4)     The radioscopic examination data shall be recorded and stored on videotape, magnetic disk or optical disk at the maker's plant for a sufficient period after the date of radioscopic examination as specified by the Inspecting Authority, Efficient radioscopic examination record recall shall be made available at any time over the record retention period and shall be traceable to the test objects.

(5)     When repair has been performed as a result of radioscopic examination, the repaired areas shall be re-examined using the same radioscopic technique to evaluate the effectiveness of the repair.

(6)     To aid in proper interpretation of the radioscopic examination data, the details of the technique used shall accompany the data.  As a minimum, the information shall include the approved procedure requirements and system performance test data.


Reg. 266 a

General

Any repair to a weld carried out by the manufacturer shall first be agreed to by the Inspecting Authority.

Where defects occur in distributed positions in a seam, repairs to the extent of 15 per cent. of the total length of the seam shall be permitted to replace the defective welding.

Where the defects are located in a single continuous length, the permissible extent of repair shall be decided by the Inspecting Authority.



Reg. 266 b

Longitudinal Seams

Where the weld metal in any way fails to comply with the requirements specified the whole of the weld metal may be removed and the seam re-welded provided that:

i) the original test plates are similarly treated, or
ii) new test plates of the same thickness as the joint and of similar quality of material are attached to the end of the seam and re-welded with it.

In either case the plates shall be tested in accordance with Regulations 257 to 265 and the requirements for heat treatment shall be in accordance with Regulation 267.




Reg. 266 c

Circumferential Seams

With regard to the extent of permissible repair and when agreed by the Inspecting Authority a circumferential seam shall be treated in the same manner as a longitudinal seam. The Inspecting Authority shall be entitled to call for representative tests for a re-welded circumferential seam.

 
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