GOST 16774-2015
GOST 16774−2015 copper tubes of rectangular and square cross-sections. Specifications
GOST 16774−2015
INTERSTATE STANDARD
COPPER TUBES OF RECTANGULAR AND SQUARE SECTIONS
Specifications
Copper tubes of rectangular and square sections. Specifications
ISS 23.040.15
Date of introduction 2016−04−01
Preface
Goals, basic principles and main procedure of works on interstate standardization established GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−97 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. Rules of development, adoption, application, renewal and cancellation"
Data on standard
1 DEVELOPED by the Technical Committee for standardization TC 106 «Tsvetmetprokat», Scientific-research, project and design Institute for alloys and processing of nonferrous metals «joint-stock company «Institute tsvetmetobrabotka» (JSC «Institute tsvetmetobrabotka»)
2 as AMENDED by the Federal Agency for technical regulation and Metrology (Rosstandart)
3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol dated may 29, 2015 N 77-P)
The adoption voted:
| Short name of the country on MK (ISO 3166) 004−97 |
Country code MK (ISO 3166) 004−97 |
Abbreviated name of the national authority for standardization |
| Armenia |
AM | Ministry Of Economy Of The Republic Of Armenia |
| Belarus |
BY | Gosstandart Of The Republic Of Belarus |
| Kazakhstan |
KZ | Gosstandart Of The Republic Of Kazakhstan |
| Kyrgyzstan |
KG | Kyrgyzstandard |
| Russia |
EN | Rosstandart |
| Tajikistan |
TJ | Tajikstandart |
4 by Order of the Federal Agency for technical regulation and Metrology dated 30 September 2015 N 1417-St interstate standard GOST 16774−2015 introduced as a national standard of the Russian Federation from April 1, 2016.
5 INSTEAD OF GOST 16774−78
Information about the changes to this standard is published in the annual reference index «National standards», and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet
1 Scope
This standard applies to cold drawn copper tubes of rectangular and square cross-sections for the conductors of the windings of stators of electrical machines with liquid cooling.
The standard specifies the dimensions, technical requirements, acceptance rules, methods of control and testing, packaging, labeling, transportation and storage of pipes.
2 Normative references
This standard uses the regulatory references to the following international standards:
GOST 859−2014 Copper. Brand
GOST 2991−85 wooden disposable Boxes for loads up to 500 kg. General specifications
The Wire GOST 3282−74 General purpose low carbon steel. Specifications
GOST 3560−73 package steel Strip. Specifications
GOST 5151−79 wooden Drums for electrical cables and wires. Specifications
GOST 6507−90 Micrometers. Specifications
GOST 7229−76 Cables, wires and cords. Method of determination of electrical resistance of conductors and conductors
GOST 8695−75 Pipe. Test method for flattening
GOST 9557−87 flat wooden Pallet size 800x1200 mm. specifications
GOST 9569−2006 waxed Paper. Specifications
GOST 9717.2−82 Copper. Method of spectral analysis on a metal standard samples with photographic registration of spectrum
GOST 9717.3−82 Copper. Method of spectral analysis of oxide standard specimens
GOST 10006−80 (ISO 6892−84) of the Pipe metal. Test method tensile
GOST 13938.11−2014 Copper. Method for the determination of arsenic
GOST 13938.13−93 Copper. Methods for determination of oxygen
GOST 14192−96 Marking of cargo
GOST 15102−75 the universal metal closed Container of nominal gross mass 5,0 t Technical specifications
GOST 15846−2002 Products that are sent to the far North regions and equated areas. Packing, marking, transportation and storage
GOST 21140−88 Tara. System sizes
GOST 24231−80 non-ferrous metals and alloys. General requirements to selection and preparation of samples for chemical analysis
GOST 24597−81 the packaged goods. Basic parameters and dimensions
GOST 31382−2009 Copper. Methods of analysis
Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.
3 Terms and definitions
This standard applies the following terms with respective definitions:
3.1 rectangular pipe: Hollow article of rectangular cross section having uniform nominal wall thickness, which at all stages of production has a continuous rectangular section.
3.2 nominal wall thickness: wall Thickness specified in the order.
3.3 measuring length: the Product of a certain length, specified in the order, straight leg, or in the Bay.
3.4 dent: the Defect of the surface in the form of randomly-spaced local depressions of various sizes and shapes.
3.5 warpage: the Deviation from flatness, in which the metal surface has a convexity and concavity in the longitudinal and transverse cross sections.
3.6 koltsevatost: a Defect in the form of periodically repeating ridges and grooves of annular shape on the surface of semi-finished products having a circular cross section.
3.7 shell: the surface defects in the form of grooves, having an elongated or point form.
3.8 stratification: the surface defects in the form of a discontinuity of metal, oriented along the direction of deformation.
3.9 risk: the Defect of the surface in the form of narrow longitudinal recess or protrusion.
3.10 captivity: the Defect of the surface in the form of delamination, often azkabanu forms, partly United with the base metal.
3.11 crack: a Defect in the form of local rupture of metal of various sizes, having any direction.
3.12 scratch: a Defect of a surface which is a recess in the form of strips, may be of irregular shape and an arbitrary direction.
4 Assortment
4.1 Form, the geometric dimensions of pipes and tolerances for the dimensions shall be as specified on figure 1 and in tables 1 and 2.
Figure 1. Form, the geometrical dimensions of tubes and maximum deviations in sizes
Figure 1
Table 1 — Nominal dimensions and limit deviations for sizes of pipes with wall thickness of 1,5 mm and less drums
| In millimeters | ||||||||
| and±0,10 |
b±0,10 |
s |
s |
R | ||||
| Nomin. |
Pred. off. when you increase high-precision fabrication- management |
Pred. off. when Norma- heating, precision manufacture management |
Nomin. |
Pred. off. when you increase high-precision fabrication- management |
Pred. off. when Norma- heating, precision manufacture management | |||
| 5,0; 4,0 |
8,0 8,5 8,6 9,0 10 |
1,0 |
- |
±0,10 |
1,0 |
- |
±0,10 |
0,9−1,2 |
| 4,5 |
10,0 | |||||||
| 5,0 |
7,4 7,5 8,0 8,5 |
1,5 |
+0,05 -0,20 |
±0,15 |
1,5 |
+0,05 -0,20 |
±0,15 | |
| 8,5 8,6 |
1,3 |
±0,10 |
±0,13 |
1,3 |
±0,10 |
±0,13 | ||
| 8,6 9,0 9,3 9,5 10,0 11,2 11,6 11,8 12,5 |
1,5 |
+0,05 -0,20 |
±0,15 |
1,5 |
+0,05 -0,20 |
±0,15 | ||
| 5,1 |
1,3 |
±0,10 |
±0,13 |
1,3 |
±0,10 |
±0,13 | ||
| 5,1 |
5,9 6,0 |
1,5 |
+0,05 -0,20 |
±0,15 |
1,5 |
+0,05 -0,20 |
±0,15 | |
| 5,9; 6,0 |
5,9 6,0 |
1,5 |
+0,05 -0,20 |
±0,15 |
1,5 |
+0,05 -0,20 |
±0,15 | |
| Notes 1 Tube, listed in this table are manufactured with a length of not less than 200 m. 2 one reel To the winding is allowed up to three pipes with a length of at least 200 m, but welded. | ||||||||
Table 2 — Nominal dimensions and limit deviations for sizes of pipes with wall thickness of 5.5 mm or more in segments
| and, mm |
b, mm |
s, mm |
s |
R, mm |
Length of tubes, m | ||||
| Nomin. |
Pred. off. |
Nomin. |
Pred. off. |
Nomin. |
Pred. off. |
Nomin. |
Pred. off. | ||
| 18,0 |
±0,50 |
60,0 |
±0,60 |
6,0 |
±0,90 |
6,0 |
±0,90 |
2.0 to 2.5 |
5,4 |
| 22,0 |
±0,40 |
22,0 |
±0,40 |
5,5 |
±0,55 |
5,5 |
±0,55 |
1,5−3,0 |
7,0 |
| 25,0 |
±0,50 |
70,0 |
±0,70 |
9,0 |
±1,35 |
9,0 |
±1,35 |
2.0 to 2.5 |
5,4 |
| 30,0 |
±1,25 |
110,0 |
±1,80 |
15,0 |
±1,80 |
10,0 |
±1,25 |
2.0 to 2.5 |
3,3 |
| Notes 1 Limit deviations of length for tubes listed in this table should not exceed +10 mm. 2 At the request of the consumer pipe size 25х70х9 mm are made with a length not less than 6.5 m. | |||||||||
4.2 Theoretical weight of 1000 m of pipes with nominal cross section of the pipe given in table A. 1 of Annex A.
4.3 Pipe wall thickness of 1.5 mm or less is wound on cable drums. The length of the pipe wall thickness of 5.5 mm and over are made in segments of standard length.
The legend of pipes are placed according to the scheme:
| pipe |
D | XX | X | M | … | MD | BR | … | GOST 16774−2015 |
| a method of manufacturing | |||||||||
| sectional shape | |||||||||
| precision manufacturing | |||||||||
| condition | |||||||||
| dimensions | |||||||||
| length | |||||||||
| form of delivery | |||||||||
| the grade of metal | |||||||||
| the designation of this standard |
Use the following abbreviations:
| method of manufacture: |
cold-deformed (drawn) — D; |
| sectional shape: |
rectangular — OL, square — KV; |
| precision manufacturing: |
normal — N, increased — P; |
| condition: |
soft — M; |
| length: | dimensional — MD; |
| form of delivery: | the drums — BR. |
Examples of symbols of pipes:
Tube, drawn, square, high precision manufacturing, soft, size section 6,0х6,0 mm, wall thickness of 1.5 mm, on reel, copper brand M1r:
Pipe DKVM 6,0х6,0x1,5 BR M1r GOST 16774−2015
The pipe is drawn, rectangular, normal accuracy, soft, size of section 4,0х9,0 mm, a wall thickness of 1.0 mm, on reel, from copper marks M1:
Pipe DPNM 4,0x9,0x1,0 BR M1 GOST 16774−2015
The pipe is drawn, rectangular, soft, size of section 30,0х110,0 mm, a wall thickness of 15.0 and 10.0 mm, a measuring length of copper grade Mob:
Pipe LOM 30,0х110,0х15,0x10,0 MD Mob GOST 16774−2015
5 Technical requirements
5.1 Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
5.2 Pipe made out of copper marks the Mob, M1 and M1r with the chemical composition according to GOST 859.
5.3 Pipe produce cold-drawn, soft (annealed).
Pipe wall thickness of 1.5 mm or less are manufactured in annealed basicsliderui environment.
5.4 External and internal surfaces of the pipes should be clean, free of dirt, impeding the inspection, do not have cracks, shells, bundles, shells and foreign debris.
On the surface of the pipes they are not allowed scratch, risks, koltsevatost and other defects, bringing the size of the pipe thickness at the control sweep beyond one-half of the tolerances, and the dents, displaying tolerances on external dimensions.
On the inner surface should be free of blockages, exfoliation and coking sludge from lubrication.
5.5 Pipe wall thickness more than 1.5 mm should be trimmed evenly and should not have significant burrs.
Pipe wall thickness of 1,5 mm and less in places butt welding and the ends should be tapered to the contact of the inner walls.
5.6 On pipes is not allowed concavity of the walls, bringing the external dimensions of the cross section beyond the sub-zero tolerances. For pipes with wall thickness of 1.5 mm or less, the concave outer cross-section dimensions should not exceed 0.1 mm.
5.7 Mechanical properties the tubing shall be:
— temporary tear resistance — not less than 200 MPa (20 kgf/mm
);
— elongation after rupture is not less than 35%.
It is possible to manufacture tubes with the following standards mechanical properties:
— temporary tear resistance — not less than 210 MPa (21 kgf/mm
);
— elongation after rupture is not less than 35%.
5.8 electrical resistivity of the pipe material at 20 °C shall not exceed:
for copper grades Mob, M1 — 0,0175 Om·mm/m (Ohm·m);
— for copper marki M1r — 0,0195 Ohm·mm/m (Ohm·m).
5.9 Pipe must be sealed.
Pressure and holding time depending on wall thickness shall conform to the requirements specified in table 3.
Table 3
| Wall thickness, mm | Test pressure, MPa (kgf/cm |
The dwell time under pressure, min |
| 1,0 | 2,9 (30) |
2 |
| 1,3 | 6,9 (70) | |
| 1,5 | 6,9 (70) |
5.10 Pipes of copper grades and M1r Mob must withstand flattening tests; to check for the absence of hydrogen embrittlement.
6 acceptance Rules
6.1 Pipe take parties. The party must consist of tubes of one brand of copper, same size, same precision workmanship and must be issued a document about quality that contains:
is the trademark or name and trademark of manufacturer;
— the name of the country of manufacture;
— legal address of the manufacturer and/or seller;
— the symbol of the pipes;
— test results (as required);
— the batch number;
— the weight of the batch.
Allowed to issue a single document the quality of several batches of tubes of the same size, the same brand of alloy shipped at the same time to the same consumer.
The weight of the batch shall not exceed 2000 kg.
May increase of the batch weight up to 5000 kg with a proportional increase in sample size in table 4.
Table 4
| Controlled parameter |
The number of subsection of this standard | The number of the check pipe wall thickness | |
| 1.5 mm and less | More than 1.5 mm | ||
| Outer dimensions |
4,1; 7,2 | 100% | 100% |
| Wall thickness |
4,1; 7,2 | Five pipes from the party | Five pipes from the party |
| The outer surface |
5,4; of 7.1 | 100% | 100% |
| The inner surface |
5,4; 7,4 | One pipe from the pipes, wound on two reels |
Five pipes from the party |
| Critical defects |
7,5 | 100% | - |
| The concavity of the walls |
5,6; 7,2 | One pipe from the pipes, wound on two reels |
Five pipes from the party |
| Mechanical properties |
5,7; 7,6 | The same | Three pipes from the party |
| Electrical resistivity |
5,8; of 7.7 | « | Five pipes from the party |
| Hydrogen embrittlement |
5,10; 7,9 | « | The same |
| Chemical composition |
5,2; 7,10 | « | Two pipes from the party |
6.2 To verify the compliance of quality of pipes to the present standard requirements from each party selected sample in accordance with the requirements of table 4.
On the manufacturer allowed sampling to determine the chemical composition of spending from the molten metal.
6.3 If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch of tubes.
The results of repeated testing are spreading to the entire party.
7 Methods of inspection and testing
7.1 Inspection of the external surface of the pipes is carried out without the use of magnifying devices.
7.2 Control the outside dimensions of pipes is carried out with a micrometer according to GOST 6507.
From the pipe wound on a drum, to control the outside dimensions cut one sample.
Control of the thickness and concavity of the pipe wall is measured with a micrometer according to GOST 6507 on the flat parts of planes.
7.3 it is allowed to control the dimensions of internal cross section and wall thickness of tubes and other measuring instruments required accuracy.
7.4 For the inspection of the inner surface of the pipe and measuring the geometric dimensions of the selected tubes cut one sample length of 150 mm. the Sample after measuring the external dimensions is cut lengthwise into two parts, inspect the inner surface and measure the thickness of the wall.
7.5 Inspection of pipes with wall thickness of not more than 1.5 mm in the presence of critical defects conduct a non-destructive method of control (vortex testing) according to the method specified in Annex B.
By agreement between the consumer and the manufacturer is allowed to visually check the surface of each tube.
7.6 tensile Test is carried out according to GOST 10006 on long longitudinal specimens.
For the tensile test from each tube, taken from the party, take one sample.
7.7 electrical resistivity for pipes with wall thickness of 1.5 mm or less, determined according to GOST 7229, for pipes with wall thickness more than 1.5 mm is determined by conductivity measurement inductive conductivity tester type EI-1.
The electrical resistance of the samples is the reciprocal of the obtained values of electrical conductivity.
For determination of specific electrical resistance from each tube, taken from the party, take one sample.
7.8 Pipe wall thickness of 1.5 mm or less, subjected to internal pressure test according to the method agreed upon between customer and manufacturer.
7.9 To check on the «hydrogen embrittlement» of the pipe is subjected to flattening test. Before testing, the samples are annealed in a hydrogen environment at 820°C-850°C for 40 min.
Test flattening is carried out according to GOST 8695 at room temperature.
Testing flattening from each tube, taken from the party, take one sample.
7.10 To determine the chemical composition from each tube, taken from the party, take one sample.
Selection and preparation of samples for chemical composition analysis is carried out according to GOST 24231.
Determination of the chemical composition for pipes is carried out according to GOST 13938.11, GOST 13938.13, GOST 9717.2, GOST 9717.3, GOST 31382, or other methods of equal accuracy standard.
If there is disagreement in the assessment of the chemical composition of pipes, the analysis is carried out according to GOST 13938.11, GOST 13938.13 or GOST 31382.
8 Packing, marking, transportation and storage
8.1 Pipe wall thickness of 1.5 mm or less is wound on cable drums N 8 or 8A according to GOST 5151 with sheathing boards. The distance from the upper layer of the pipes to the edge of the cheeks should not be less than 50 mm. the weight of the pipe on the drum shall not exceed 250 kg.
Allowed the drums are not to sheathe the wooden planks when you package in 2−3 layers of nonwoven materials for technical documentation, then in two layers — waxed paper according to GOST 9569 or other types of packaging materials without deteriorating the quality of the packaging, with the exception of linen and cotton fabrics, and ligation with twine made of synthetic material or another material that does not deteriorate the quality of packaging tubes, technical documentation.
8.2 Pipe in segments tied into bundles weighing not more than 80 kg wire diameter not less than 1.2 mm according to GOST 3282 with any strip of paper under the wire. The ends of the wire connected by twisting at least five turns. Bundles of tubes are Packed in wooden boxes types II-1, II-2 according to GOST 2991, lined with waxed paper according to GOST 9569 and fixed so that it no longer move them during the transportation.
Dimensions of boxes — GOST 21140 or technical documentation.
8.3 Consolidation packages to transport packages weighing up to 1,000 kg carried out in accordance with the requirements of GOST 24597.
Packaging is carried out on pallets according to GOST 9557 or without pallets with the use of bars not less than 50 mm and strapping in at least two areas or cross wire with a diameter of not less than 3 mm according to GOST 3282 or steel tape of size not less than 0,3х30 mm according to GOST 3560, or by using a sling also packageable. The ends of the wrapping wire fasten twist of five turns, the tape is in the castle.
8.4 Transport the marking of packages is carried out according to GOST 14192 with the indication of manipulation sign «Protect from moisture». On the label attached to the cable drum or tube bundle needs to be specified:
is the trademark or name and trademark of manufacturer;
— the symbol or pipe grade, pipe size, precision manufacturing, the condition of the material, the designation of this standard;
— the number of the drum;
— the batch number;
stamp of technical control or the technical controller.
8.5 In each drawer or one of the drawers of the container must be nested packing list, which specify the following information:
is the trademark or name and trademark of manufacturer;
— the name of the country of manufacture;
— legal address of the manufacturer and/or seller;
— the symbol or pipe grade, pipe size, precision manufacturing, the condition of the material, the designation of this standard;
— the batch number;
stamp of technical control or the technical controller;
the weight of the party;
— the date of manufacture.
8.6 Packaging tubes are designed for areas far North and equated localities, carried out in accordance with the requirements of GOST 15846, group «Metals and metal products.»
8.7 Pipe transporterowych all types of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species, small and carload shipments.
For pipes longer than 3 m of the vehicle is determined in accordance with cargo carriage regulations applicable to transport of this species.
Allowed pipe in segments to be transported in containers according to GOST 15102 or specialized containers according to the technical documentation without packaging in boxes.
The pipe is laid and reinforcing, so that during transportation to prevent movement, mixing batches and mechanical damage.
Allowed other types of packaging and packaging materials, ensuring the safety of pipes during transportation, according to the technical documentation.
8.8 Pipe should be stored indoors in conditions excluding mechanical damage, contamination, moisture and exposure to active chemical substances.
Under specified storage conditions consumer properties of the pipe do not change.
The application And (reference). Theoretical weight of 1000 m of pipes with nominal cross-section
Appendix A
(reference)
Table A. 1
| and |
b |
s |
s |
The cross-sectional area, mm |
Theoretical weight of tubes, kg |
| mm | |||||
| 4,0 |
8,0 |
1,0 |
1,0 |
20,0 |
178,0 |
| 4,0 |
8,5 |
1,0 |
1,0 |
21,0 |
186,9 |
| 4,0 |
8,6 |
1,0 |
1,0 |
21,2 |
188,7 |
| 4,0 |
9,0 |
1,0 |
1,0 |
22,0 |
195,8 |
| 4,0 |
10,0 |
1,0 |
1,0 |
24,0 |
213,6 |
| 4,5 |
10,0 |
1,0 |
1,0 |
25,0 |
222,5 |
| 5,0 |
5,0 |
1,3 |
1,3 |
19,3 |
171,7 |
| 5,0 |
7,4 |
1,5 |
1,5 |
28,2 |
250,9 |
| 5,0 |
7,5 |
1,5 |
1,5 |
28,5 |
253,6 |
| 5,0 |
8,0 |
1,5 |
1,5 |
30,0 |
267,0 |
| 5,0 |
8,5 |
1,3 |
1,3 |
28,3 |
252,2 |
| 5,0 |
8,5 |
1,5 |
1,5 |
31,5 |
280,3 |
| 5,0 |
8,6 |
1,3 |
1,3 |
28,6 |
254,5 |
| 5,0 |
8,6 |
1,5 |
1,5 |
31,8 |
283,0 |
| 5,0 |
9,0 |
1,5 |
1,5 |
33,0 |
293,7 |
| 5,0 |
9,3 |
1,5 |
1,5 |
33,9 |
By 301.7 |
| 5,0 |
9,5 |
1,5 |
1,5 |
34,5 |
307,0 |
| 5,0 |
10,0 |
1,5 |
1,5 |
36,0 |
320,4 |
| 5,0 |
11,2 |
1,5 |
1,5 |
39,6 |
352,4 |
| 5,0 |
11,6 |
1,5 |
1,5 |
40,8 |
363,1 |
| 5,0 |
11,8 |
1,5 |
1,5 |
41,8 |
372,0 |
| 5,0 |
12,5 |
1,5 |
1,5 |
43,5 |
387,1 |
| 5,1 |
5,1 |
1,3 |
1,3 |
19,7 |
175,8 |
| 5,9 |
5,9 |
1,5 |
1,5 |
26,4 |
235,0 |
| 6,0 |
6,0 |
1,5 |
1,5 |
27,0 |
240,3 |
| 18,0 |
60,0 |
6,0 |
6,0 |
792,0 |
7048,8 |
| 22,0 |
22,0 |
5,5 |
5,5 |
363,0 |
3230,7 |
| 25,0 |
70,0 |
9,0 |
9,0 |
1386,0 |
12335,4 |
| 30,0 |
110,0 |
15,0 |
10,0 |
2500,0 |
22250,0 |
Note — the Density of copper is taken equal to 8.9 g/cm | |||||
Appendix B (mandatory). Method of eddy current testing of rectangular copper pipes
Appendix B
(required)
B. 1 Purpose and scope
B. 1.1 Method of eddy current testing used to detect discontinuities of the material (in the form of cracks, delaminations, bubbles, shells, scratches, holes, dents, non-metallic inclusions etc.) on the outer and inner surfaces and in the thickness of the material of rectangular copper pipes with wall thickness from 1 to 1.5 mm inclusive.
B. 1.2 Eddy current testing according to this method provides the identification in the annealed tube defects that give equal or greater distortion of the electromagnetic field, than an artificial defect, which mutes the sensitivity of the flaw detector. The actual dimensions of the defects, their form and character is determined by metallographic studies.
B. 2 General requirements for inspection
B. 2.1 For control of rectangular copper pipes with wall thickness up to 1.5 mm inclusive are used:
— eddy current flaw VD-30P (or other device with similar characteristics);
— set walk-through eddy current probes (sensors) of different diameters;
— drawl-centering device with automatic sorting or automatic marks defective areas;
— the reference (standard) sample.
B. 2.2 Eddy current flaw detector shall be fitted with a drawl-centering device that provides a rigid alignment of the pipe in the area of control and stable speed of its movement. Indicator electrical centering is the independence of signal intensity from the position of the discontinuities on the circle. The inconsistent may be either natural (previously discarded tube) and artificial.
B. 2.3 Recommended internal bore of the Converter to select so as to obtain the maximum filling of the hole, i.e. the diameter of the through hole of the sensor does not exceed the diameter of the testing pipe by more than 3 mm.
B. 2.4 Equipment, which carry out control pipe must be fitted with a device to suppress the signal of the end effect.
B. 2.5 Broaching centering device is an Electromechanical means of feed pipe passing through the Converter.
The device must support the tube concentrically relative to the electrical center of the coil passage of the transducer.
B. 3 Selection of the reference (standard) samples for flaw detector sensitivity adjustment
B. 3.1 For setting eddy current flaw detector to a predetermined sensitivity made special reference (standard) samples of pipe sections with a length of 1000−1500 mm, having a cross section of the testing pipe.
B. 3.2 a Section of pipe from which is made the standard sample, must not have any defects listed in 5.4 of this standard.
B. 3.3 At a distance of 500−700 mm from the end of the sample, in the center of the broad side, drill two through holes with a diameter of 1.0 and 0.8 mm at a distance of at least 250 mm from each other, enough to flaw recorded individual signals from each hole without interference from the ends of the sample.
B. 3.4 the Reference sample is considered valid if it has certificate approved by the chief of the Central laboratory of the manufacturer.
B. 3.5 the Reference sample is used to configure the detector for minimum sensitivity control, providing reliable detection of all available on the sample of artificial discontinuities for periodic testing of the controls.
B. 3.6 Reference samples made from tubes of the same alloy, condition, size, and controlled the pipe. Allowed divergence of the reference model with controlled only the pipes of wall thickness, but not more than 0.5 mm.
B. Preparation of 4 eddy current flaw detector for control
B. 4.1 Pipe needs to be cleaned of dust, dirt, oil, significant burned-on food grease, metal cuttings, loose scale and other surface contamination.
B. 4.2 Before you begin monitoring the detector output on the mode and test its performance in accordance with the technical description, operating instructions and methods of control.
B. 4.3 Setting the sensitivity of the detector is performed using reference samples, and it must meet the conditions of production control tubes. The correct setup of eddy current flaw detector should be checked when switching from one size to another, but not less than 2 h after the operation.
B. 4.4 When configuring the device the speed of the sample must correspond to the speed of the controlled tubes.
B. 5 control
B. 5.1 Pipe for one served in a drawl-centering device, designed to supply pipes to the sensor of the flaw detector with a certain constant speed, providing the detection of critical defects.
B. 5.2 Check the defective portion of the pipe is carried out according to light up the scoreboard, «Marriage», the light which illuminates the passage of this pipe section through the sensor or the control system, providing the sort of controlled pipes to appropriate and do not meet the technical requirements of the caller and stop the rewinding machine. In addition, it can be connected by marking the device.
B. 5.3 Defective portion of the pipe mark the drilling holes with a diameter of 2.0 mm.
Allowed a defective pipe to mark the drilling of the wall of pipe diameter drill bit 3.0 mm.
B. 5.4 If the passage of the pipe does not occur, the signal «Marriage," indicating the presence of unacceptable discontinuities in it, then the pipe is considered suitable. Otherwise, the pipe shall be rejected.
B. 5.5 is allowed no more than four critical defects on the pipe section length of 200 m.
B. 5.6 Control settings eddy current flaw detector should be carried out before each start of work and periodically every 2 hours of continuous operation by two to three times a day with passing the sample through the installation.
B. 5.7 When they detect violations of setup control pipe should be discontinued until recovery mode of operation of the equipment. All pipes are inspected for these violations, subjected to repeated testing.
B. 6 processing of the results
B. 6.1 Results eddy current tubing inspection log, which shall be specified the basic conditions of inspection: reference sample, the type of installation, the volume control, the operating frequency, the size of passage of the transducer.
B. 6.2 journal Entries are used for statistical analysis of the effectiveness of the control tubes and the state of the technological process of their production.
