GOST 17217-79

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  ГОСТ 17217-79

GOST 17217−79 Pipes of copper-Nickel alloy brand MNZH5−1. Specifications (with Amendments No. 1, 2)

GOST 17217−79

Group В64

STATE STANDARD OF THE USSR
TUBES OF COPPER-NICKEL ALLOY
BRAND MNZH5−1

Specifications

Tubes of copper-nickel alloy mnzh 5−1.
Specifications

GST 18 4750

Date of introduction 1981−01−01

Promulgated by the decree of the USSR State Committee for standards from 21 Aug 1979 N 3166

Proven in 1985 by the Resolution of Gosstandart from 23.04.85 1156 N validity extended to 01.01.91*

________________

* Expiration removed by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification. (IUS N 11−12, 1994). Note the «CODE"

REPLACE GOST 17217−71

REVISED (may, 1986) with amendment No. 1, approved in April 1985 (IUS 7−85).

AMENDED No. 2, approved by resolution of the USSR State Committee on management of quality and standards from 20.02.90 N 236, introduced with effect from 01.10.90 and published in IMS No. 5, 1990

Change 2 N entered the law office of «Code» in the text IUS N 5 1990


This standard covers cold drawn and extruded tubes of copper-Nickel alloy brand MNZH5−1 intended for the shipbuilding industry

1. ASSORTMENT

1.1. Outer diameter wall thickness cold-drawn tubes shall be as specified in table. 1.

(Changed edition, Rev. N 2).

Table 1

External diameter, mm		Theoretical weight of 1 m pipe, kg, at wall thickness, mm
Nomin.	Pred. off.	1,0±0,10	1,5±0,15	2,0±0,20	2,5±0,25	3,0± 0,30	3,5± 0,30	4,0± 0,40	5,0± 0,40	5,5± 0,50	6,0± 0,50	7,0± 0,60	7,5± 0,70	8,0± 0,70	10,0± 0,75
6	-0,15	0,14	0,19	-	-	-	-	-	-	-	-	-	-	-	-
7	0,17	-	-	-	-	-	-	-	-	-	-	-	-	-
8	0,19	-	-	-	-	-	-	-	-	-	-	-	-	-
Nine	-0,20	0,22	0,31	0,39	-	-	-	-	-	-	-	-	-	-	-
10	0,25	0,36	0,45	-	-	-	-	-	-	-	-	-	-	-
12	0,31	0,44	0,56	-	-	-	-	-	-	-	-	-	-	-
14	0,36	0,52	0,67	0,80	-	-	-	-	-	-	-	-	-	-
15	0,38	0,57	-	-	-	-	-	-	-	-	-	-	-	-
16	-0,24	0,42	0,61	0,78	094	-	-	-	-	-	-	-	-	-	-
18	0,48	0,69	0,90	-	-	-	-	-	-	-	-	-	-	-
19	0,50	0,73	0,95	-	-	-	-	-	-	-	-	-	-	-
20	0,53	0,78	1,01	1,22	1,43	1,62	1,79	-	-	-	-	-	-	-
21	0,56	0,82	1,06	-	-	-	-	-	-	-	-	-	-	-
22	0,59	0,86	1,12	1,36	1,60	-	2,02	-	-	-	-	-	-	-
23	0,62	0,90	1,18	-	-	-	-	-	-	-	-	-	-	-
24	0,64	0,94	Of 1.23	-	1,76	-	-	-	-	-	-	-	-	-
25	-0,30	0,67	0,99	1,29	-	1,85	-	-	-	-	-	-	-	-	-
26	0,70	1,03	Of 1.34	-	-	-	-	-	-	-	-	-	-	-
28	0,76	1,11	1,46	-	-	-	2,69	-	-	-	-	-	-	-
29	0,78	1,15	-	-	-	-	-	-	-	-	-	-	-	-
30	0,81	1,20	-	-	-	-	-	-	-	-	-	-	-	-
32	-	1,28	1,68	-	2,44	-	-	-	-	4,37	-	-	-	-
36	Mobility in soil -0,35	-	1,45	1,90	2,34	-	-	-	4,34	-	-	-	-	-	-
38	-	1,53	2,02	2,43	2,94	-	-	-	-	-	-	-	-	-
40	-	-	-	-	-	-	-	-	-	-	-	6,82	-	-
45	-0,40	-	1,83	2,41	2,97	3,53	4,07	-	-	-	6,55	-	-	-	-
46	-	-	-	-	-	-	-	-	-	-	-	-	8,51	-
50	-0,50	-	-	-	-	3,95	-	5,15	-	-	-	-	-	-	-
55	-	-	2,97	3,67	4,37	-	Of 5.71	-	The 7.62	-	-	-	-	-
60	-	-	3,25	4,02	4,79	-	6,27	-	-	-	-	-	-	-
65	-0,60	-	-	3,53	4,37	5,21	Of 6.03	Of 6.83	-	-	-	-	-	-	-
70	-	-	3,81	4,72	5,63	-	7,39	-	-	-	-	-	-	-
75	-	-	4,09	5,07	6,05	-	7,95	-	-	-	-	-	-	-
80	-	-	-	-	-	-	8,51	-	-	-	-	-	-	-
85	-0,80	-	-	4,65	5,77	6,89	-	9,07	11,20	12,24	-	-	-	-	-
90	-	-	-	-	Of 7.31	-	-	11,90	-	-	-	-	-	-
105	-	-	-	Of 7.17	8,57	9,95	Of 11.31	-	-	-	-	-	-	-
110	-	-	-	-	-	-	-	14,70	-	-	-	-	-	-
114	-	-	-	-	-	-	-	-	-	-	Of 20.97	-	-	-
115	-	-	-	7,87	-	-	-	-	-	-	21,17	-	-	-
125	±0,50	-	-	-	8,57	-	-	-	-	-	19,99	-	-	-	-
130	-	-	-	8,92	10,67	Of 12.40	Of 14.11	-	-	-	-	-	-	-
135	-	-	-	-	-	-	-	18,20	-	-	-	-	-	-
139	-	-	-	-	-	-	-	-	-	-	Around 25.87	-	-	-
140	-	-	-	-	-	-	-	-	-	-	Of 26.07	-	-	-
145	-	-	-	-	-	-	-	-	-	-	-	-	-	37,80
155	-	-	-	-	12,77	-	16,91	21,00	-	-	-	-	-	-
156	-	-	-	-	Of 12.83	-	-	-	-	-	-	-	-	-
160	±0,60	-	-	-	-	-	-	-	Of 21.70	-	-	Of € 29.99	32,02	-	-
165	-	-	-	-	-	-	-	-	-	-	-	33,07	The 35, 17	-
170	-	-	-	-	-	-	-	-	-	-	-	-	-	44,80
180	-	-	-	-	-	17,30	Of 19.71	-	-	-	-	-	-	-
185	-	-	-	-	-	-	-	25,20	-	-	-	-	-	-
190	-	-	-	-	-	-	-	25,20	-	-	-	From 40.77	-	-
205	-	-	-	-	-	19,75	22,51	28,00	-	-	-	-	-	-
206	-	-	-	-	-	Of 19.84	-	-	-	-	-	-	-	-
210	±0,70	-	-	-	-	-	-	-	28,70	-	-	-	-	-	-
215	-	-	-	-	-	-	-	-	-	-	From 40.77	-	-	-
220	-	-	-	-	-	-	-	-	-	-	-	-	-	58,80
258	±0,80	-	-	-	-	-	-	Of 28.45	35,42	-	-	-	-	-	-
260	±0,90	-	-	-	-	-	-	28,67	-	-	-	-	-	-	-

Note. Theoretical mass calculated for the nominal size when the density of the alloy is 8.9 g/cmand is for reference only.

2. At the request of the consumer made tubes extreme deviations in the inner and outer diameter, the maximum deflection at the inner diameter should correspond to the limit deviations of the outside diameter specified in table. 1, and the maximum deviation of the wall thickness from the nominal value at any point must not exceed the values given in table. 1, more than 50%.

(Changed edition, Rev. N 1, 2).

1.2. Cold-deformed pipes of all diameters made of random length. Random length of pipe shall be as defined in table. 2.

At customer’s request, tubes with a diameter up to 40 mm inclusive manufactured lengths from 0.5 to 6 m with an interval of 50 mm.

Pipe with a wall thickness of 6 mm produce length less than 2 m.

Allowed pipe diameter more than 45 mm in length, less than specified in table. 2, but not less than 1 m up to 10% of the batch weight.

Table 2

Diameter of pipe, mm	Wall thickness, mm	Length of tubes, m
From 6 to 46	0,5−6,0	4−6
SV. 46 «145	2,0−6,0	3−5
«145» 260	3,0−6,0	2−3

1.3. The dimensions of extruded tubes and limit deviations thereon shall be as specified in table. 3.

Table 3

External diameter, mm		Wall thickness, mm
Nomin.	Pred. off.	Nomin.	Pred. off.	Length, m, not less	Theoretical weight of 1 m pipe, kg
115	±1,5	25,0	±2,0	1,5	63,0
130	±1,5	5,0	±0,5	1,5	17,5
140	±1,5	10,0	±1,0	1,5	36,4
7,5	±0,75	1,5	37,27
185	±1,9	45,0	±4,5	0,8	176,4
55,0	±5,5	0,8	Of 200.2
245	±2,5	12,5	±1,2	1,5	81,37
270	±2,8	15,0	±1,5	1,5	107,1
270	±2,8	60,0	±6,0	0,8	352, 8 thous
275	±2,8	60,0	±6,0	0,8	361,2

Note. At the request of the consumer made tubes extreme deviations in the inner and outer diameter, the maximum deflection at the inner diameter should correspond to the limit deviations of the outside diameter specified in table. 3, and the maximum deviation of the wall thickness from the nominal value at any point must not exceed the values given in table. 3, more than 50%.


Extruded tubes are made of random length.

1.4. Maximum deviations on length of pipes shall not exceed:

+10 mm — diameter pipes up to 20 mm;

+15 mm — at diameter of pipes in excess of 20 to 40 mm.

The legend of the tubes are filled under the scheme:

Pipe	X	CU	N	X	…	XX	…	GOST 17217−79
A method of manufacturing
Sectional shape
Precision manufacturing
Condition
Dimensions
Length
Mark
The designation of this standard
when the following abbreviations:

cold	— D;
extruded	— G;
round	— CU;
normal accuracy	— N;
soft	— M;
solid	— T;
random length	— ND;
multiple lengths	— KD.

Note. Instead of the absent indicator put an 'X'.

Examples of symbols

Pipe cold drawn, normal precision manufacturing, rigid, outer diameter of 30 mm, a wall thickness of 1 mm, a length of a multiple of 1.5 m made of alloy MNZH5−1:

Pipe DKRNT 30Х1Х1500КД MNZH5−1 GOST 17217−79

The same, extruded, round, normal precision manufacturing, the outer diameter of 270 mm, a wall thickness of 15 mm, random lengths alloy brand MNZH5−1:

Pipe GCMH 270Х15НД MNZH5−1 GOST 17217−79

(Changed edition, Rev. N 1, 2).

2. TECHNICAL REQUIREMENTS

2.1. Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner. Pipes made of alloy MNZH5−1 according to GOST 492−73.

(Changed edition, Rev. N 1).

2.2. Cold drawn tubes are manufactured in soft and hard States.

2.3. Surface of the pipe (interior and exterior) should be free from contamination, hinder visual inspection.

On the surface of the pipe are not allowed dents, marks edits, small slivers, risks, scratches, as long as they control the sweep output tubes for maximum deviations in size.

Allowed koltsevatost, color tint and slight surface oxidation of the tubes.

(Changed edition, Rev. N 1).

2.4. The tubes should not be bundles, prisstina, cracks, bubbles, cavities and other defects.

2.5. Pipes shall be trimmed evenly, no rough burrs. Allowable cut end Squareness, mm should take the pipe over the limit deviations in length and must not exceed:

2 mm — for pipes with a diameter up to 50 mm incl.;

4 mm — for tubes with diameter over 50 to 105 mm incl.;

5 mm — for pipes with a diameter of 105 St. to 170 mm incl.;

7 mm — for pipes with a diameter of 170 mm. St

2.6. Ovality and raznoshennoy should take the pipe over the limit deviations for outer diameter and wall thickness, respectively.

2.7. Pipe must be straight. Curvature of 1 m of solid cold-drawn pipe outer diameter more than 10 mm should not exceed:

5 mm — for tubes with outer diameters up to 156 mm incl.;

7 mm — for pipes with outside diameter of more than 156 mm.

The curvature of the extruded pipe should not exceed 15 mm per 1 m length.

The curvature of the rigid pipe with a diameter of 10 mm or less, and also the soft pipes are not regulated.

(Changed edition, Rev. N 1, 2).

2.8. Mechanical properties of pipes shall be as specified in table. 4.

Table 4

A method of manufacturing pipes	Temporary resistance kgf/mm(MPa) not less than	Elongation after rupture , %, not less
Extruded	23,0 (225)	25,0
Drawn (annealed)	26,0 (255)	30,0

(Changed edition, Rev. N 1).

2.9. Pipe shall withstand flattening tests; in a cold condition without cracks or tears to the gap in two thicknesses.

2.10. Pipe with a diameter of 65−90 mm shall withstand a test hydraulic pressure. The test pressure is determined by agreement between the consumer and the manufacturer.

Test pressure () MPa (kgf/cm) for soft pipes must not exceed the value calculated according to the formula

,

where  — wall thickness, mm;

 — internal diameter, mm.

(Changed edition, Rev. N 1).

2.11. The pipes should withstand the test turn-up cuffs without the appearance of cracks and tears.

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of pipes of the same size, one material condition and one method of manufacture, and furnished by a single document about quality that contains:

trademark or the name and trademark of manufacturer;

the symbol of the pipes;

the weight of the party;

batch number;

the results of the tests.

The weight of the batch should not exceed 3,000 kg.

(Changed edition, Rev. N 1).

3.2. Checking the quality of the outer surface must be subjected to each tube.

3.3. To check the quality of the inner surface of pipes with diameter up to 40 mm inclusive select five of the pipes from the party. Quality control of internal surface of pipes with a diameter greater than 40mm shall be subjected to each tube.

3.4. Control of the diameter and wall thickness is carried out «blindly» (by the greatest objectivity) according to GOST 18321−73. The control plans comply with GOST 18242−72.

To control the diameter of the pipe of all sizes and wall thickness pipe with an inner diameter more than 12 mm number of controlled tubes is determined in accordance with table. 5.

Table 5

The number of tubes in the party.	The number of controlled tubes.	Rejection number.
From 2 to 8	2	1
«9» 15	3	1
«16» 25	5	1
«26» 50	8	2
«51» 90	13	2
«91» 150	20	3
«151» 280	32	4
«281» 500	50	6
«501» 1200	80	8
SV. 1200	125	11

To control the wall thickness of pipes with an internal diameter of 12 mm and less than the number of controlled tubes is determined in accordance with table. 6.

Table 6

The number of tubes in the party.	The number of controlled tubes.	Rejection number.
Up to 50	3	1
From 51 to 150	5	1
«151» 500	8	2
«501» 3200	Thirteen	2
SV. 3200	20	3

The number of tubes in the batch is calculated by the formula

,

where is the mass of pipes in the batch, kg;

theoretical weight of 1 m pipe, kg;

 — average pipe length, m.

The party is considered valid if the number of pipes not satisfying requirements of the PP.1.1 and 1.3, less than the acceptance number given in table. 5 and 6.

If unsatisfactory results the manufacturer is allowed to control each pipe.

(Changed edition, Rev. N 2).

3.5. The test tubes with a diameter of 6−60 mm in the absence of delaminations, cracks, bubbles, cavities and other defects, and pipes with a diameter of 65−90 mm leak are produced on the two tubes from the party.

For pipes, special purpose inspection is carried out on all pipes of the party.

3.6. The test tubes with a diameter of 100−275 mm in the absence of Presstime make all pipes of the party.

The test tubes with a diameter of 100−275 mm with a wall thickness of 5 mm and less on the lack of press utain allowed by agreement between manufacturer and consumer spend on the three pipes from the party.

(Changed edition, Rev. N 2).

3.7. Control skew of the cut and the curvature of the pipes is carried out on two pipes from the party.

3.8. The tensile test is carried out on two pipes from the party.

3.9. Test flattening is carried out on two pipes from the party.

3.10. Test turn-up cuffs is carried out at three pipes from the party.

3.11. For chemical analysis are taken from two pipes of the party. On the manufacturer allowed the sampling of molten metal.

3.12. If unsatisfactory test results of at least one indicator thereon, a second test of the doubled sample taken from the same batch. The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. Inspection of external and internal surfaces of pipes shall be made without the use of magnifying devices.

For inspection of the inner surface of pipes with a diameter up to 20 mm from each tube, taken from the sample, cut a sample of length 150 mm and cut lengthwise into two parts.

The inspection of internal surfaces of pipes with a diameter of 20 to 40 mm, inclusive, should be made with the use of the lit screen.

(Changed edition, Rev. N 1).

4.2. The outer diameter and wall thickness of pipes and check with a micrometer according to GOST 6507−78.

Allowed to control the diameter and wall thickness of pipes is another tool that provides the necessary precision.

To check wall thickness of pipes with a diameter up to 12 mm from each tube, taken from the sample, cut a sample of length 150 mm and cut into two parts.

Measurement of outer diameter is carried out at a minimum distance of 30 mm from the pipe end.

Control of the diameter and wall thickness are performed with a given probability of 96%.

(Changed edition, Rev. N 1, 2).

4.3. For the determination of chemical composition from each tube, taken from the sample take one sample.

The selection and preparation of samples for chemical analysis is produced according to GOST 24231−80.

The chemical composition of the pipes is determined according to GOST 6689.1−80 — GOST 6689.23−80 or other methods to ensure the specified accuracy. The differences in the evaluation of the chemical composition analysis is carried out according to GOST 6689.1−80 — GOST 6689.23−80.

On the manufacturer’s chemical analysis may be performed on the samples taken from the molten metal.

On the manufacturer is allowed to control the contents of arsenic, antimony, bismuth, phosphorus, sulfur, carbon, periodically, once in three months, subject to the compliance of their content with the requirements of GOST 492−73.

(Changed edition, Rev. N 1, 2).

4.4. The test tubes with a diameter of 6−60 mm in the absence of delaminations, cracks, bubbles, cavities and other defects, and pipes with a diameter of 100−275 mm in the absence of Presstime produce non-destructive methods by methods, described in mandatory appendices 1−3.

In ultrasonic inspection of pipes with a diameter of 6−60 mm setting to produce artificial risk, applied on the outer and inner surface of the pipe, depth 5% of wall thickness and a length of 10 mm.

In ultrasonic inspection of pipes with a diameter of 100−275 mm in the absence of Presstime adjust the sensitivity in the radial hole with a flat bottom with a diameter of 1.6 mm.

When eddy current control setting produce a through hole in the pipe wall 0.8 mm diameter for pipes with a diameter of 19 mm and 1.0 mm — for pipes with a diameter from 20 to 30 mm.

Allowed with eddy-current control setting to carry on through the hole in the wall pipes of other diameters, as agreed between manufacturer and user.

Control tubes produce ultrasonic method.

(Changed edition, Rev. N 1, 2).

4.5. Test hydraulic pressure shall be carried out according to GOST 3845−75 aged 10−15 C.

Allowed to inspect a non-destructive method.

4.6. Ovality, curvature, the cosine measure cutting pipes according to GOST 26877−86. Ovality is determined at a distance of not less than 100 mm from the pipe end.

(Changed edition, Rev. N 2).

4.7. Excluded. Izm. N 2.

4.8. The tensile test shall be carried out according to GOST 10006−80 on long samples.

Samples taken from cold-deformed pipes, produced in the solid state, are experiencing after annealing in air for 1 h at 650−700°C.

For the tensile test from each tube, taken from a sample cut on the same model.

(Changed edition, Rev. N 1).

4.9. The flattening test shall be carried out according to GOST 8695−75 on samples with a length of 20−50 mm.

Samples taken from pipes manufactured in a solid state, experience after annealing by the mode specified in clause 4.8.

Testing flattening from each tube, taken from a sample cut on the same model.

(Changed edition, Rev. N 1).

4.10. Requirements paragraph 2.11 provided by the production technology. The differences in assessing the quality of test turn-up cuffs must be carried out according to GOST 8693−80. From each tube, taken from a sample cut on the same model. Samples taken from pipes manufactured in a solid state, experience after annealing by the mode specified in clause 4.8.

(Changed edition, Rev. N 1).

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Solid pipe with wall thickness up to 1 mm inclusive and soft pipes with wall thickness up to 1.5 mm inclusive, and the hard and soft pipe with wall thickness up to 2 mm and an outer diameter of 60 mm or more must be Packed in tight or slatted wooden boxes of types I, II-1, II-2, III-1, III-2, VI-1, VI-2 according to GOST 2991−85, type I-1, I-2, II-1, III-1, VII-1 according to GOST 10198−78. Dimensions of boxes — GOST 21140−75 or according to normative-technical documentation.

Solid pipe with a wall thickness of 1.5 mm, soft and hard pipe with a wall thickness of 2 mm and an outer diameter of 55 mm or less, and pipe with a wall thickness of 2.5 mm all diameters must be transported in bundles without packing in boxes. Each tube bundle shall be tied at least in two places with twine made of synthetic material according to normative-technical documentation or tape of size not less than 0,3х30 mm according to GOST 3560−73 or wire with diameter not less than 1.2 mm according to GOST 3282−74 thus, to prevent mutual movement of pipes. Binding: wire — stranding at least 5 turns of tape to the castle.

Consolidation packages in overpacks shall be in accordance with the requirements of GOST 24597−81, GOST 23238−78.

Packaging is carried out on pallets according to GOST 9557−87 or without pallets with the use of bars with a minimum thickness of 50 mm and a piping in at least two areas or cross wire with a diameter of not less than 3 mm according to GOST 3282−74 or tape of size not less than 0,3х30 mm according to GOST 3560−73.

(Changed edition, Rev. N 1, 2).

5.1 a. Weight of cargo must not exceed 5000 kg When transported in covered railway cars, the weight of cargo must not exceed 1250 kg.

(Added, Rev. N 1).

5.2. Transport marking — according to GOST 14192−77.

(Changed edition, Rev. N 1).

5.3. To each bundle of pipes or a single pipe should be attached a label or pasted on the inner surface of the pipe is the label, which indicate:

the name or trademark of the manufacturer;

grade;

the size of the pipes;

the condition of the material;

batch number.

When transporting pipes in specialized containers of bundles of pipes is allowed to label each pipe. In this case, the marking applied to the label attached to one tube of the top row.

(Changed edition, Rev. N 1, 2).

5.4. In each box or container must be attached to the packing list in which you specify the data listed in paragraph 5.3, and the weight of the batch.

(Changed edition, Rev. N 1).

5.5. Pipe transporterowych by all kinds of transport in accordance with shipping rules applicable on the transportation of the species.

Transporting the pipe by rail is small and carload shipments.

It is allowed to transport the pipe in universal containers according to GOST 20435−75, GOST 15102−75 or in specialized containers according to normative-technical documentation without packaging in boxes and without cords.

5.6. Packaging and transport tubes are designed for areas far North and remote areas shall be in accordance with the requirements of GOST 15846−79.

(Changed edition, Rev. N 1).

5.7. Pipe should be stored indoors, in conditions excluding mechanical damage to the pipe, to keep moisture and active chemical reagents.

(Changed edition, Rev. N 1).

ANNEX 1 (mandatory). THE METHOD OF AUTOMATED ULTRASONIC TESTING OF PIPES

ANNEX 1
Mandatory

The method used in the inspection of pipes with a diameter of 4 mm and over and wall thickness from 1 mm to 45 inclusive, and provides detection in pipes of natural defects, for which the amplitude of the reflected signal equal to or greater than the amplitude of the signal from the artificial defect is selected as a rule of rejection by ultrasound. Monitoring provides information about the section of pipe containing the defect and its conditional length.

When working according to this method applies pulse-echo immersion method inspection, while implementing the scheme of control according to GOST 17410−78.

Inspection of the tubes to longitudinal defects produced by ultrasonic waves propagating around the circumference in two opposite directions in accordance with GOST 17410−78.

When working with shtykovaniem the ends of the pipe lengths up to 90 mm are not controlled.

1. General requirements

1.1. Requirements section of the ultrasonic flaw detection

1.1.1. The working section for holding the ultrasonic control must be located away from plants, polluting the air with industrial dusts, sources of radio interference and bright light sources, with fencing equipment and working place of the operator.

1.1.2. The work site must be:

connections AC mains frequency of 50 Hz and voltage of 220 and 380 V. If the fluctuations in the network exceeds , the power supply to the unit must be via a voltage regulator (SNE 220−0,5, etc.);

supply and drainage industrial water;

supply network compressed air pressure 1.5−2.5 ATM;

rack for holding test samples;

additional bath or other device for pre-wetting of the tubes (if necessary);

metal ruler, cleaning materials, marking pens, markers and scribers for marking defective locations;

Desk to record the results of the control and storage of necessary materials;

workers test samples to customize the installation and periodic inspections of its sensitivity;

StegoVideo pipes;

local coverage of the space above the immersion bath.

2. Equipment

2.1. Apparatus for inspection of metal pipe shall meet the requirements of GOST 17410−78.

For carrying out automated ultrasonic testing flaw detection is used to set the type Mikron, IDTS-8 UDG-4M, the Dnieper, IDC-3M and others with the technical specifications for NTD, not inferior to those listed.

2.2. As part of the installation included:

the electronic components of the type DUK-66, UD-10УА, UDM-3 UDM-1M etc., providing the frequency of the ultrasonic pulses parcels of not less than 900 Hz and the operating frequency control of 1.8; 2.5 and 5.0 MHz;

the control unit performing the grading of the pipes and providing 100% fixation of the artificial defects in the test sample when the unattended setup:

acoustic unit, consisting of mechanisms of orientation sensors and sensors, fixed motionless relative to the translational moving and rotating the pipes in the immersion bath, acoustic unit, rotating around a steadily moving tube and which contains one or more sensors.

For pipes with external diameter up to 140 mm inclusive shall be used current sensors.

It is recommended to use a lens with a ratio of the focal length to the transverse size of the transducer no more than two. Used round converters with a diameter of 8, 10 and 22 mm and other rectangular size 15х4 and 15x10 mm, etc.

Focal distance in mm of the cylindrical lenses is calculated by the formula

,

where is the radius of curvature of the concave surface of the lens, mm;

is the refractive index;

 — the speed of sound in the surrounding liquid, cm/s;

 — speed of longitudinal waves in material of lens, cm/s.

Sensor to control the pipe diameter of 140 mm may have an operating frequency of 1.8 and 2.5 MHz.

2.3. Truboprodazha device that translational-rotational movement of the pipe with a controllable-pitch feed (for example UK-1).

3. Test samples

3.1. Each size pipe shall be manufactured working test and control samples.

Workers test samples intended for the setup and periodic checks of the sensitivity of the apparatus, control to establish the feasibility of the engineering test samples.

3.2. The control test sample stored on the site involved in the verification test samples.

Workers test samples are a duplicate of the checklist and check with them in accordance with GOST 17410−78.

The estimation of amplitudes of signals from the artificial defects on the working and the control test pieces for hot-deformed pipes may be carried out by the contact method.

3.3. Test specimens made from tubes without defects of the same material and size, and controlled batch of pipes.

Allowed to produce test specimens from pipes that are similar in chemical composition and geometrical dimensions in accordance with GOST 17410−78.

3.4. The length of the test sample is determined by technical capabilities truboprofilnogo device and an acoustic unit.

Allowed to produce compound (weld) test specimen for pipes with a diameter greater than 57 mm and a wall thickness of equal to or more than 6 mm.

3.5. In the manufacture of the test piece on the outer and inner surface of the pipe without defect cause artificial defects, such as scratches.

For cold-drawn tubes with wall thickness up to 6 mm profile grooves triangular, for the other — in accordance with the requirements of GOST 17410−78.

Risks on the specimens is applied in accordance with the requirements of GOST 17410−78. The distance between risk of at least 50 mm, and the location of the scratches from the pipe end is determined by the design of the immersion bath and truboprofilnogo device.

Risks can be applied to different segments of pipes. It is supposed to spread risks along the pipe is not one forming.

Longitudinal risk should be parallel to the pipe axis, the deviation from parallelism should not exceed 1°.

On a test sample from one of the ends of electrocorundum or prescriber must be applied:

the number of the test sample;

type sample;

the grade of metal;

the size of the pipe.

3.6. The depth and length of the artificial lines, which are used for sensitivity setting of ultrasonic units and grading of the pipes is established in this standard.

3.7. Artificial defects like scratches are applied mechanically. Risks of triangular shape is applied with a chisel with a sharpening angle of 30±5°. After production risks of each cutter re-sharpen with lapping cutting edges on the surface roughness µm according to GOST 2789−73.

(Changed edition, Rev. N 2).

3.8. Allowed risks to produce electrical discharge method, if the signal differs from the signal risks made mechanically, is not more than ±2 dB.

3.9. To each test sample attached to a passport, which stated:

sample number, material grade, diameter and wall thickness;

purpose (operating or control);

the depth, the length of the defect and its nature (longitudinal or cross-risk);

the date of manufacture.

3.10. To test the samples of the inner surface 4−5 of the selected nozzles is applied from 5 to 10 ticks. Estimate the maximum amplitude of the signals from the lines under the control of the alleged test samples for the ultrasonic installation in static mode. Setting the acoustic unit is produced by any of the manufactured grooves, or on the available test samples of the appropriate size. The position of the control knobs on the instrument under evaluation has to be fixed.

The assessment is made using the attenuators on the instruments DUK-66 and UD-10УА and purity of the pulses on the devices UDM-1M and UDM-3.

Risks combined into one group if the difference of the amplitudes of the signals does not exceed ±1,5 dB for instruments DUK-66 and UD-10УА or ±10% of measured values for the flaw of UDM.

In the same group must be at least 5 ticks.

All the risks of each group except the two for the control and working of the test piece, are opened and their sizes are measured by microsection on the microscope MIM-7, MIM-8, or through MIS-11, OEM-1 and other tool microscopes, not inferior to them in technical characteristics.

For depth the risks of taking the arithmetic average of the depths measured in the Central section and in sections located at a distance of 1 mm in either direction from the Central section to the lines of 5 mm length; 2 mm for scratches 10 mm long; 7 mm for lines with a length of 25 mm and 15 mm for the other lines.

The arithmetic means of the dimensions of the exposed risks of the group are considered to be the size of the ticks on the remaining anticipated work, control and test samples.

As the control and working of the test samples are selected those for which the average depth of the scratches is different from the depth values established by special documents not more than ±10%.

If no pair of alleged test samples are placed on the tolerance of the depth-defined artificial defect, or if the group contains five lines with the same (with an accuracy of ±1.5 dB or ±10%) the signal amplitude, the process of making test samples should be repeated.

3.11. Estimate of the size of artificial grooves on the inner surface of the sample is allowed to produce by the method of plastic impressions (molds) for pipes with internal diameter not less than 13 mm.

3.11.1. The accuracy of measuring risks with the help of prints by this method — at least a quarter of admission to a depth of risks according to GOST 17410−78.

3.11.2. The impression material is self-hardening plastic on the basis of Kurilovich resins (protakril).

Before removing the impression preparing the plastic. To do this, mix the powder and liquid protakril in a glass or porcelain vessel in a ratio of 2:1 (by volume). The powder must be completely saturated with liquid, the surface of the mass should be shiny and homogeneous. When mixing the powder and liquid you need to avoid getting air bubbles in the liquid, this is a staple when mixing mass all the time have to touch the bottom of the vessel. Before pouring the mixture should have the consistency of condensed milk.

Cooking time and solidification of the plastic depends on temperature. At a temperature of 20−40°With the time of swelling of the plastic is about 5 min, the solidification time is about 20 min.

The surface of the defect and adjoining portions of the surface of the pipe must be rinsed with dichloroethane, dried with compressed air and moistened with liquid protakril.

The fill mass defect remote from the pipe end to a distance of 300 mm, is made using a spoon with a long handle.

Immediately after that, as the mass filled into the defect, it is inserted into the puller.

Before tacking the pipe to be cooled, abundantly wetting it with cold water. The separation of impression is facilitated if the pipe before cooling was warm (30−40°C).

The hardened impression is separated from the tube with the puller. The impression should be opened carefully, avoiding movement of the puller along the pipe and to the side.

Section of plastic with a print defect is separated from the puller with a knife. Remaining on the puller, plastic removed from it after heating to a plastic state.

3.11.3. The quality of the print is determined by visual inspection.

3.11.4. The height of the print (the depth of the defect) measure on the microscope MIS-11.

In the case of removing a re-print in case of bad first impression, the plastic remaining in the defect can not be removed, since the re-fill of the defect of stuck particles of plastic is firmly connected to the main ground and along with it are separated from risks.

The size of the grooves on the inner surface of the samples can be also measured by dial indicators with needle tip with a scale division of 0.001 mm to measure grooves with depth less than 0.1 mm and with a scale division of 0.01 mm for the remaining ticks.

Length risks is determined using any measuring instrument with division value not exceeding 10% of the set value.