GOST 7512-82

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  ГОСТ 7512-82

GOST 7512−82 nondestructive testing. Welded connections. Radiographic method (with Change No. 1)

GOST 7512−82

Group B09

INTERSTATE STANDARD

Nondestructive testing

WELDED CONNECTIONS

Radiographic method

Nondestructive testing. Welded joints. Radiography method

ISS 25.160.40

Date of introduction 1984−01−01

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 20.12.82 N 4923

2. REPLACE GOST 7512−75

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

4. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

5. EDITION (October 2005) with amendment No. 1, approved in March 1988 (ICS 6−88)

Reissue of the (TATUS of April 2008)


This standard specifies a method of radiographic inspection of welded joints of metals and their alloys, made by fusion welding, with the thickness of the welded elements from 1 to 400 mm, using x-ray, gamma and bremsstrahlung radiation and radiographic film.

1. GENERAL PROVISIONS

1.1. Radiographic inspection is used to identify welded joints of cracks, lack of penetration, pores, slag, tungsten, oxide and other inclusions.

1.2. Radiographic inspection is also used to detect burn-through, undercut, estimates of the magnitude of the convexity and concavity of weld root, not valid for external inspection.

1.3. During the radiographic inspection does not reveal:

— any defect and include the size in the direction of scanning at least twice the sensitivity of the control;

— lack of fusion and cracks, the plane of the disclosure which do not coincide with the direction of transmission and (or) the value of disclosure less than the values given in table.1;

— any discontinuity flaws and inclusions if their images coincide with the images of extraneous details, sharp corners or sharp changes of fractures of the illuminated metal.

1.1−1.3. (Changed edition, Rev. N 1).

Table 1

mm

1.4. Radiographic control of welded joints subjected to with respect to the radiation thickness of the deposited weld metal to the total radiation thickness not less than 0.2, has a two-way access, providing the possibility of inserting the cassette with the radiographic film and radiation source in accordance with the requirements of this standard.

(Added, Rev. N 1).

2. REQUIREMENTS FOR FACILITIES TO CONTROL

2.1. Under radiographic control, use the marks made from the material providing the receiving their clear images on radiographic images.

You should use marks of the sizes, established by GOST 15843.

2.2. During the radiographic inspection should be used radiographic film corresponding to the technical requirements on them.

Type of radiographic film should be installed by technical documentation on the control or acceptance of welded joints.

2.3. For radiographic testing, you should use the radiation sources under GOST 20426.

The type of radioactive source, the voltage at the x-ray tube and the energy of the accelerated electrons should be set depending on the thickness of the illuminated material technical documentation on the control or acceptance of welded joints.

2.4. As intensifying screens for radiographic testing shall be used metal and fluorescent screens.

Type intensifying screen should be installed by technical documentation on the control or acceptance of welded joints.

The thickness of the metal intensifying screens and methods of charging film into the cassette with the use of screens is given in Appendix 1.

2.5. Screens should have a clean smooth surface. The presence on the screens folds, scratches, cracks, tears and other defects are not allowed.

2.6. Magazine charging of the layer must be opaque and provide a compact pressure intensifying screens to the film.

2.7. To protect the film from scattered radiation, it is recommended to screen the film cartridge on the side opposite to the radiation source, lead screens.

The thickness of the protective screens are given in Appendix 2.

2.8. To determine the sensitivity control should be applied to the wire, the grooving of the plate or the standards of sensitivity.

2.9. The standards of sensitivity must be made of metal or alloy, which chemical composition is similar to the basis of a monitored welded joint.

2.10. The shape and size of the wire standards of sensitivity given on features.1 and in table.2. The length of the wire references — (20±0,5) mm Limit deviation for wire diameters:

Damn.1. Form wire standards sensitivity

1 — insert; 2 — case

Damn.1

Table 2

mm

Maximum deviations of other dimensions ±0.5 mm.

The liner and cover for the wire references must be made from flexible transparent plastic.

(Changed edition, Rev. N 1).

2.11. The shape and dimensions of the grooving standards of sensitivity given on features.2 and in table.3.

Damn.2. Form grooving standards sensitivity

Damn.2

Table 3

mm

2.12. The shape and dimensions of the plate references the sensitivity given on features.3 and in table.4.

Damn.3. Form of plate standards sensitivity

Damn.3

Table 4

mm

2.13. The marking standards of sensitivity should be lead by the numbers according to GOST 15843 in accordance with Annex 3. The first digit of the marking should indicate the material standard, the following (one or two digits) is the number of the reference.

Legend material sensitivity standard: for iron-based alloys — 1, aluminium and magnesium — 2, Titan — 3, copper — 4, Nickel — 5.

2.14. For marking grooving standards are allowed to use cutouts and holes or just holes shown in Annex 3. In this case, the thickness of the Etalon in place of the marking should be equal .

Marking standards holes the length of standard No. 1 is 27mm, N 2 — 38,5mm, N 3 — 53mm.

2.15. For weldments intended for export allowed the use of other types of standards of sensitivity, if the terms of export.

3. PREPARATION FOR CONTROL

3.1. Radiographic inspection should be carried out after the elimination of discovered by external examination of welded joints defects and Stripping it from bumps, slag, spatter, scale and other contaminants, which images in the picture can interfere with the decoding of the image.

3.2. After Stripping the welded connection and eliminate external defects must be made the marking of the welded joint portions and labeling (numbering) of the plots.

3.1, 3.2. (Changed edition, Rev. N 1).

3.3. System of marking and labelling of parcels set technical documentation on the control or acceptance of welded joints.

3.4. When monitoring at each site should be set standards of sensitivity and marks.

3.5. The sensitivity standards should be set in the controlled section on the side facing the radiation source.

3.6. Wire standards should be set directly on the seam direction of the wires across the joint.

3.7. Grooving the standards should be set at a minimum distance of 5 mm from the weld with the direction of the grooves across the joint.

3.8. Plate standards should be set along the seam at a distance of not less than 5 mm from it or directly on the seam direction standard seam across so that images of the marks of the standard do not overlap with the image of the seam in the picture.

3.9. Under the control of circumferential welds of pipelines with diameter less than 100 mm grooving is allowed to set standards at a minimum distance of 5 mm from the weld with the direction of the grooves along the seam.

3.10. If you can’t install standards from the radiation source to weld cylindrical, spherical and other hollow products through two walls with decryption only adjacent to the film area of the welded connection and also in the panoramic scanning is allowed to set the standards of sensitivity on the part of the cassette.

3.11. (Deleted, Rev. N 1).

3.12. Marks used to limit the length controlled by one exposure areas of welded joints, should be installed on the boundaries of the marked areas and on the borders of the weld and base metal when the weld without reinforcement or with the removed reinforcement of the seam.

3.13. Marks used for the numbering of the controlled areas should be installed in a controlled area or directly on the tape so that images of the marks in the images does not overlap with the image of the near-weld zone according to claim 5.7.

3.14. If you can’t install standards of sensitivity and (or) markings on the controlled section of the welded joint in accordance with the requirements of this standard the procedure of conducting monitoring without installation standards of sensitivity and (or) markings shall be provided in the technical documentation for control or acceptance of welded joints.

(Changed edition, Rev. N 1).

4. CIRCUIT CONTROL

4. CONTROL SCHEME

4.1. Welded joints should be controlled by the devil.4 and 5.

4.2. When a limited width of the weld element is allowed to perform control of t-welds with the direction of radiation by forming this item in accordance with the devil.6.

4.2. When inspection of welds of cylindrical and spherical hollow products should, as a rule, use of the scheme of x-raying through one wall of the product (schemes of the devil.5a, b, e, f, h). It is recommended to use the circuit transmission with the location of the radiation source inside a controlled product:

schema features.5e (panoramic radiography) — for control products with a diameter up to 2 m regardless of the volume control and with a diameter of 2 m or more at 100% strength control;

schema features.5W — at 100% strength and selective control, if the use of schema features.5e is impossible;

schema features.5z — sampling inspection of products with a diameter of 2 m and more;

— schemes of the devil.5a, b — for products with internal diameter of 10 m or more, if the scheme features.5e is impossible.

(Added, Rev. N 1).

4.3. When monitoring through two walls the scheme of the devil.5in recommended for screening products with a diameter up to 100 mm; schemes of the devil.5d, e — for screening products with a diameter more than 50 mm.

Damn.4. Scheme of the testing of butt, lap, corner and t-joints

Scheme of the testing of butt, lap, corner and t-joints

1 — radiation source; 2 — controlled land; 3 — cassette tape

Damn.4

Damn.5. Schematic of the control ring (butt, molestache, corner and t -) of welded joints

Schematic of the control ring (butt, lap, corner and t -) of welded joints

1 — radiation source; 2 — controlled land; 3 — cassette tape

Damn.5

Damn.6. The t-control of welded joints

1 — radiation source; 2 — controlled land; 3 — cassette tape

Damn.6

4.4. In the testing of butt welded joints according to the schemes of the devil.5a, b, e, W, W direction of radiation must coincide with the plane of the monitored weld. When control on these schemes fillet welds warke pipes, fittings, etc., the angle between the radiation direction and the plane of the welded joint should not exceed 45°.

4.5. When weld inspection on schemes of the devil.5C, d, d, the direction of radiation should be selected so that images of the opposite sections of the weld in the picture do not overlap each other.

The angle between the radiation direction and the plane of the weld must be minimal and in any case not to exceed 45°.

4.3−4.5 (Amended, Rev. N 1).

4.6. (Deleted, Rev. N 1).

4.7. In addition to the control schemes given on features.4−6, depending on the design features of welded joints and their requirements can be used in other schemes and areas of radiation.

These diagrams and the direction of radiation shall be provided with technical documentation on the control and acceptance of welds.

4.8. To reduce the difference between the optical densities of various portions of the picture under control of welded joints with large difference in thicknesses, and in case when the monitored weld does not protect radiographic film from exposure to direct radiation (for example at the control edge weld worki tubes in the tubesheet, under the control of surfacing of edges for welding, etc.), control should be carried out using the device of expansion joints.

Use the compensators of any material providing the required attenuation of radiation.

4.9. When the scheme and the direction of radiation should be considered:

— distance from the controlled weld to radiographic film should be minimal and in any case not to exceed 150 mm;

— the angle between the radiation direction and the normal to the radiographic film within controlled in a single exposure phase of the welded joint should be minimal and in any case not to exceed 45°.

4.7−4.9. (Changed edition, Rev. N 1).

5. THE CHOICE OF PARAMETERS OF RADIOGRAPHIC TESTING

5.1. Distance from the radiation source to the nearest source to the surface of the targeted area of the welded connection (at the x-raying of welded joints of cylindrical and spherical hollow products through two walls — to the nearby source of surface controlled weld) and size or number controlled by one exposure areas for all transmission schemes (excluding schemes of the devil.5e) should be selected such that when the candling was performed to the following requirements:

geometric unsharpness of the image defects on images at the location of the film closely controlled weld shall not exceed half of the required sensitivity and control sensitivity to 2 mm and 1 mm with a sensitivity of more than 2 mm;

— the relative increase in the size of the images of the defects located on the side of the radiation source (in relation to defects in the film), must not exceed 1,25;

— the angle between the radiation direction and the normal to the film within controlled in a single exposure of site welded connections shall not exceed 45°;

— reduction of the optical density image of the welded joint on any part of this image against the optical density at the installation location of the wire sensitivity standard or in relation to the optical density of the image or plate grooving of the reference sensitivity shall not exceed 1.0.

5.2. The formula to determine the minimum allowable distances from the radiation source to the controlled weld as well as the maximum size and minimum number controlled by one exposure areas in the control schemes of the devil.4−6, is given in Appendix 4.

5.1, 5.2 (Revised edition, Edit. N 1).

5.3. If you weld for shit.5z (panoramic radiography) the ratio of the inner diameter to the outer diameter of the monitored connection must not be less than 0.8, and the maximum size of the focal spot of the radiation source should not be more , where is the sensitivity control.

5.4. In cases when the defect sizes are not defined (for example, the defects are not allowed regardless of their size), is given in section 5.3 the ratio between the inner and outer diameters of the controlled connections can not be observed.

5.5. In the absence of a source of radiation that meets the requirement of section 5.3, is subject to the control of the devil.5s to use radiation sources with a maximum focal spot size, satisfying the relation

.

In this case, the reference sensitivity should be set at a welded connection or a welded joint simulator used in the definition of sensitivity, only from the side of the radiation source.

5.6. Length of images should provide overlapping images of the adjacent sections of welded joints with the length of the monitored area up to 100 mm, at least 0.2 of the length of the section, when the length of the controlled area over 100 mm not less than 20 mm.

5.7. Width of images should provide images of the weld, standards of sensitivity labels and heat affected zone width:

— for butt and lap joints:

not less than 5 mm when the thickness of the welded edges up to 5 mm;

not less than thickness of welded edges — thickness of the welded edges St. 5 to 20 mm;

not less than 20 mm when the thickness of the welded edges over 20 mm;

— for tee and corner joints — set technical documentation on the control or acceptance of these compounds.

6. DECODING IMAGES

6.1. Viewing and decoding images should be carried out after complete drying in a darkened room with special lighting-negatoscopes.

Use negatoscopes with adjustable brightness and size of the illuminated field. The maximum brightness of the illuminated field should be at least 10CD/m, where a  — optical density of the image. The size of the illuminated field should be controlled with movable curtains or screens masks in such a range that the illuminated field is completely obscured by the picture.

(Changed edition, Rev. N 1).

6.2. Pictures, admitted to the transcript must meet the following requirements:

imaging studies should be spots, stripes, dirt and damage emulsion layer, complicating their interpretation;

— the photographs must be visible image the crop marks, labels and standards of sensitivity;

— the optical density of the images of the targeted area of the weld, heat affected zone and sensitivity standard should be not less than 1.5;

— reduction of the optical density image of the welded joint on any part of this image compared to optical image density of the reference sensitivity shall not exceed 1.0.

6.3. The control sensitivity (the smallest diameter detectable on the picture wire of a wire standard, the least depth of detected in the picture the grooves grooving a reference, the smallest thickness of the plate model for which the picture revealed a hole with a diameter equal to twice the thickness of the Etalon), should not exceed the values given in table.6*.

Table 6*

_______________
* Numbering corresponds to the original. — Note the manufacturer’s database.

mm

Note. When using wire references sensitivity values of 0.30; a 0.60; 0.75 and 1.50 mm are replaced with the values 0,32; 0,63; 0,80 and 1.60 mm.


(Changed edition, Rev. N 1).

Specific values of the sensitivity should be set technical documentation (requirements, drawings, specifications, regulations, inspection) for a controlled product.

For nuclear power plants requirements for sensitivity shall be established by relevant normative documents.

6.4. In accordance with the requirements of technical documentation for a product may be controlled to determine the sensitivity () in percentage by the formula

,

where  — sensitivity, mm;

 — transparent thickness of metal, mm.

6.5. Decoding and quality assessment of welded joints by the images, not with images of the standards of sensitivity allowed:

— when the panoramic radiography of welds while exhibiting more than four films. In these cases, regardless of the total number of shots allowed set a single standard of sensitivity on each quarter of the circumference of the welded joint;

— at impossibility of application of standards of sensitivity.

In these cases, the sensitivity is determined on the simulators of the weld when processing control regimes.

6.6. By decoding the images to determine image sizes of cracks, lack of penetration, pores, and inclusions, and, if necessary, assess the amount of concavity and convexity of the root (in cases where the root pass is not available for external examination).

To be determining the size and methodology of estimates of the magnitude of concavity and convexity of the weld root should be given in the technical documentation for control and acceptance of welds.

6.7. When documenting the results of decoding of the images defined by images dimensions should be rounded to the nearest value of a number 0,2; 0,3; 0,4; 0,5; 0,6; 0,8; 1,0; 1,2; 1,5; 2,0; 2,5; 3,0 mm or nearest integer values in millimeters, unless specified by the image size exceeds 3.0 mm.

6.8. If the control film is located at a distance from the facing to the film surface of the controlled weld and executed the ratio

,

defined by the image size before rounding is recommended to multiply by a factor

,

where  — distance from the radiation source to source facing the surface of the targeted area of the welded joint, mm;

radiation thickness, mm.

6.6−6.8. (Changed edition, Rev. N 1).

6.9. When measuring defect sizes of 1.5 mm using a measuring magnifier with scale 0,1 mm, St, 1.5 mm — any measuring device with a scale division of 1 mm.

6.10. The results of decoding pictures and the sensitivity of the control should be written in the conclusion or log of inspection results, the shape of which should be installed by technical documentation on the control or acceptance of welded joints.

6.11. To refer to defects in the conclusion or log of inspection results should be used symbols is given in Appendix 5.

Examples of abbreviating defects in deciphering images is given in Appendix 6.

7. SAFETY REQUIREMENTS

7.1. The main dangers to personnel for radiographic testing are the effects on the body ionizing radiation and harmful gases in the air under the influence of radiation and electric shock.

7.2. Radiographic inspection and recharging of radioactive sources must be conducted only with the use of specially designed for these purposes, and in a perfect working condition of the equipment, documentation, manufacture and operation of which is at issue in more than three copies should be agreed with the State Committee of the USSR on the utilization of atomic energy and the Chief sanitary-epidemiological Directorate of the Ministry of health of the USSR; up to three copies — with local bodies of sanitary-epidemiological service.

7.3. Electrical equipment operating fixed and portable setups for radiographic testing shall conform to the requirements of GOST 12.2.007.0 and «electrical installation systems Rules», approved by the Chief technical management of the operation of power systems and state energy supervision of the Ministry of energy of the USSR.

7.4. When carrying out radiographic testing, storage and recharging of radioactive sources of radiation must be secured works in accordance with the requirements of «the Main sanitary rules of works with radioactive substances and other ionizing radiation sources» OSP-72/80* N 2120−80 approved Chief state sanitary doctor of the USSR on 18 January 1980, «radiation safety Norms» NRB-76** N 141−76, approved by the Chief state sanitary doctor of the USSR on 7 June 1976, «Sanitary rules for radioisotope flaw detection» N 1171−74*, approved by Deputy Main state sanitary doctor of the USSR on 7 August 1974 and GOST 23764.
_______________
* On the territory of the Russian Federation the document is not valid. Act SP 2.6.1.2612−10.
** On-site Rossisky Federation the document is not valid. Act SanPiN 2.6.1.2523−09.
*** On the territory of the Russian Federation the document is not valid. Act SP 2.6.1.1284−03. — Note the manufacturer’s database.

7.5. When operating connected to the mains industrial fixed and portable setups for radiographic testing shall be provided the safety of the works in accordance with the requirements of «Rules of technical operation of electrical installations"* and «safety Rules at operation of electrical installations"** approved by Gosenergonadzor April 12, 1969
_______________
* On the territory of the Russian Federation the document is not valid. There are «Rules of technical operation of electrical installations», approved by order of Ministry of energy of Russia from 13.01.2003 No. 6.
** In the territory of the Russian Federation the document is not valid. Are POT R M-016−2001. — Note the manufacturer’s database.

7.6. For transport of radioactive radiation sources must comply with the requirements of «Rules of safety during transportation of radioactive substances» PTRV-73* N 1139−73 approved Chief state sanitary doctor of the USSR on 27 December 1973
________________
* On the territory of the Russian Federation the document is not valid. Are NP-053−04. — Note the manufacturer’s database.

7.7. The company performing radiographic inspection of welded joints, develop in accordance with the safety requirements of this section of the documentation defines the rules and methods of safe work organization, scope and means of radiographic inspection taking into account the local conditions of production and bring them in the prescribed manner to working.

8. METROLOGICAL ASSURANCE

8.1. Used in the control of the grooving and fin standards sensitivity shall undergo metrological calibration at the issue and subsequent verifications at least once in 5 years. With the release of these standards on the reverse side of each standard should be applied electrochemically trademark of the enterprise, to produce the standard and year of issue; at the next verification is the trademark or symbol of the company that carried out the verification and year verification.

8.2. Wire standards of sensitivity testing are not, however, they must be withdrawn from circulation at any damage of the plastic case or detection by visual inspection of corrosion of the wires standard.

8.3. Densitometers and the sets of optical densities used to determine the optical density of images to be checking at least once a year with the obligatory issuance of a document (certificate) on the results of verification.

8.4. Negatoscopes is subjected to verification only upon their issue, indicating in the passport (certificate) of the densitometer, the maximum brightness of the illuminated field and the optical density of the image.

8.5. Measuring tools used to determine image sizes of cracks, lack of penetration, pores and inclusions in the pictures (measuring ruler and magnifying glass) is subjected to verification in accordance with the regulations applicable to these instruments.

8.6. Non-standardized measuring tools used to determine image sizes of cracks, lack of penetration, pores and inclusions in the pictures (measuring templates, stencils, etc.) must be verified at least once per year with compulsory registration of a document on the verification results.

Sec. 8. (Added, Rev. N 1).

ANNEX 1 (recommended). The thickness of the metal intensifying screens. Methods of charging the magazines

ANNEX 1
Recommended


Table 1

The thickness of the metal intensifying screens

Table 2

Methods of charging the magazines

ANNEX 2 (informative). The thickness of the protective lead shields

ANNEX 2
Reference

APPENDIX 3 (obligatory). Marks for the reference standards sensitivity

APPENDIX 3
Mandatory


Table 1

Marks for the reference standards sensitivity

Table 2

Marking grooving standards

Table 3

Marking grooving standards holes

Note to table.2 and 3. Limit deviations of dimensions according to GOST 25347.

APPENDIX 4 (recommended). Distance from the radiation source to source facing the surface of the controlled weld

ANNEX 4
Recommended

1. Distance from the radiation source to source facing the surface of the controlled weld joint (at the x-raying of welds through two walls — to the nearby source of surface ring compounds) shall not be less than the values determined by the formulas given in table.1.

Table 1

where when and 4 when ;

 — radiation thickness in mm;

 — outside diameter controlled weld joint, mm;

 — the ratio of the inner and outer diameters controlled in the weld joint;

 — the maximum size of the focal spot of the radiation source, mm.

 — the required sensitivity of the control.


Note. If the schema features.5d, e conditions are not satisfied and , the distance may be taken equal to zero (i.e., the radiation source may be placed directly on the opposite of the controlled section of the wall of the product).

2. Length controlled by one exposure areas in the control schemes of the devil.4 and 6 should not be more than 0.8.

3. The number of sections (exposures) in the control schemes of the devil.5a, b, g, d should not be less than the values determined by the formulas given in table.2.

Table 2

where ; ; ;

 — inside diameter controlled weld joint, mm.

4. For schema traits.5b choose the length of the picture and the distance that must satisfy the relations

; ,

where

define the auxiliary coefficient

.

If it is not running ratio , decrease or increase to comply with this ratio, and then choose the number controlled by one exposure areas, which should satisfy the following relation

.

5. For schema traits.5W determine the maximum (based on the internal diameter of the test part and sizes or collimating the radiation heads of gamma-flaw detector or emitter x-ray unit) distance (the diameter), which must satisfy the following relation

.

If this ratio is not performed, it is necessary to use a source with a smaller focal spot, for which this ratio is performed.

When performing this ratio determines the auxiliary coefficient

and choose quantity controlled by one exposure areas, which should satisfy the following relation

.

6. The angle between the directions of radiation for the individual exposures in the control scheme is shit.5in should be

and in the control schemes of the devil.5a, b, g, d, W —

.

7. Distance from the radiation source to the controlled weld length and controlled in a single exposure plots for the inspection of welds of cylindrical and hollow spherical products with a diameter greater than 2 m are defined the same as for welded joints, circuits controlled by the devil.4 and 6.

ANNEX 4. (Changed edition, Rev. N 1).

APPENDIX 5 (mandatory). CONDITIONAL RECORDING OF DEFECTS IN DECIPHERING PICTURES AND DOCUMENTING THE RESULTS OF RADIOGRAPHIC INSPECTION

ANNEX 5
Mandatory

1. For abbreviating defects in deciphering pictures and documentation of inspection results should be used symbols is given in the table.

2. For abbreviating the maximum total length of defects (in the area of the picture with a length of 100 mm or all over the picture with its length less than 100 mm) should be used the symbol .

3. After the symbols of the defects indicated by their size in millimeters:

for spherical pores, slag and tungsten inclusions diameter;

for elongated pores, slag and tungsten inclusions are the width and length (using the multiplication sign);

for chains, clusters, oxide inclusions, lack of fusion and cracks length.

4. For chains and clusters of pores, slag and tungsten inclusions after the legend of defects included in the chain or cluster, indicate the maximum diameter or width and length of these defects (using the multiplication sign).

5. In the presence of the images of the same defects (defects of the same species with the same sizes) is allowed to record each of the defects separately, and to precede it with the symbol of the defects.

6. After the legend is the maximum total length of defects (in the area of the picture with a length of 100 mm) indicates the length in millimeters.

7. In the absence of image defects in the picture, as well as in cases when the length, width and the total length of the defects does not exceed the predetermined maximum values in the graph documentation «Meets the requirements» is «Yes», otherwise «no».

8. When detecting the image defects, not listed in paragraph 1, the report or log of inspection results should indicate the full name of the defects.

APPENDIX 5. (Changed edition, Rev. N 1).

APPENDIX 6 (reference). EXAMPLES OF ABBREVIATING DEFECTS IN DECIPHERING PICTURES AND DOCUMENTING THE RESULTS OF RADIOGRAPHIC INSPECTION

APPENDIX 6
Reference

1. In the picture found images of five pores with a diameter of 3 mm each, chains of pores with a length of 30 mm and a maximum length and width, then chain 5 and 3 mm, and the slag inclusion with a length of 15 mm and a width of 2 mm.

The maximum total length of defects on the part of a picture with a length of 100 mm is 20 mm.

The entry in the documentation: 5П3; Ц30П5х3; Ш15х2; 20.

2. In the picture found images of two clusters of pores (the length of each concentrations of 10 mm, a maximum pore diameter of 0.5 mm) and concentration of inclusions (clusters of length 8 mm, maximum length and width of the inclusions 1 and 2 mm).

The maximum total length of defects on the part of a picture with a length of 100 mm is 18 mm.

The entry in the documentation: 2С10П0,5; С8Ш2х1; 18.

3. In the picture found images of the two lack of penetration length of 15 mm and crack length of 40 mm.

Record documentation: 2Н15; T40.

4. In the picture found images of five pores with a diameter of 4 mm each and incomplete fusion with a length of 20 mm.

The maximum total length of time on the part of a picture with a length of 100 mm is 12 mm.

The entry in the documentation: 5П4; 12; H20.