X-ray inspection process specification

X-ray inspection process specification

1.1 detection range (k & e "s( e/ s$ ]5 F- s

This chapter specifies the procedures and requirements that must be followed in order to obtain a qualified transparent film during the weld penetration process. This chapter is applicable to carbon steel, low alloy steel and stainless steel material pressure vessels, pressure pipeline weld radiation penetration testing. : w" Q6 t) B9 \) {$ z; B9 I

1.2 protection 0 I; i7 @ * I5 r1 @! c5 [

should get the consent and assistance of the safety and technical department and set up obvious safety warning signs when conducting radiographic inspection on site. The maximum radiation dose allowed by the testing personnel is 5 × 10-2Sv per year, and the maximum dose allowed by the non-testing personnel is 5 × 10-3Sv per year. 8 w3 e-

1.3 testing personnel 1 | 'Y4 h3 T/ x4 v3}

testing personnel shall take up their posts with certificates according to the "Rules for Qualification Appraisal and Examination of Non-destructive Testing Personnel for Boilers and Pressure Vessels" and strictly implement the audit system., U& q3 f8 Q" c% x% A/ H

1.4 penetration mode

- B7 J4 W t0 a "f' c5 q/ L * K According to the mutual positional relationship between ray source, workpiece and film, the penetration mode is divided into five types: longitudinal seam penetration method, circular seam penetration method, circular seam penetration method, double-wall single shadow method and double-wall double shadow method.

* e2 }2 {( Z: z * h & W1.5 surface requires 5 i6 ?/ w1 l! Z' ~+ t' N1 S6 C "~

weld seam (including weld residual height) shall be qualified by visual inspection. The image of the irregular state of the surface on the film should not cover up or confuse the defects in the weld, otherwise appropriate repairs should be made. 2 R* R9 K3 q$ T$ L+ h+ h

1.6 positioning mark and identification mark

% ~ 7 O2 e "k8 W% e0 I lap mark and center mark of weld penetration site shall be set according to the situation. Identification mark product number, weld number, part number and transparent date, repair transparent parts should also have repair marks R1, R2 and other marks.

; j* V9 r L0 V- Y ~! x; o! 3 }1.7 image quality meter 1 P# X8 J- r$ T5 S. Y- |

elephant mass index is equal to the line number of the thinnest metal wire that can be identified on the negative. The material of the elephant mass meter is Fe. The linear elephant mass meter should be placed at one end of the weld area to be inspected on the surface of the workpiece on the same side as the ray source (the length of the inspected area is 1/4). The metal wire should span the weld and be placed on the outside perpendicular to the weld direction. When the image quality timer cannot be placed on the side of the source, it can also be placed on the surface of the workpiece on the side of the film, but the image quality index should be increased by one level, and an "F" mark should be added to show the difference.

"@; p( t% m6 z + ~( W1.7.1 radiographic quality grade

. D: u "P. x/ [& R The quality grade of radiation is AB. The minimum image quality gauge diameter and corresponding image quality index that must be displayed on the film are shown in Table 1. 4 C) u1 @( x0 a: m5 ]4 O3 B9 S3 c% I $C) i3

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