ELECTRIC WELDED STEEL STEEL PIPES, STRAIGHT SEAM
Range
GOST 10704-91
Date of introduction 01.01.93
1. This standard specifies the range of longitudinal electric-welded steel pipes.
2. The dimensions of the pipes must correspond to table. 1.
3. The length of the pipe is made:
- unmeasured length:
with a diameter of up to 30 mm - at least 2 m; with a diameter of St. 30 to 70 mm - at least 3 m; with a diameter of St. 70 to 152 mm - at least 4 m; with a diameter of St. 152 mm - not less than 5 m.
At the request of the consumer, pipes of groups A and B in accordance with GOST 10705 with a diameter over 152 mm are made with a length of at least 10 m; pipes of all groups with a diameter of up to 70 mm - at least 4 m long;
- measured length:
with a diameter of up to 70 mm - from 5 to 9 m; with a diameter of St. 70 to 219 mm - from 6 to 9 m; with a diameter of St. 219 to 426 mm - from 10 to 12 m.
Pipes with a diameter over 426 mm are made only of unmeasured length. By agreement between the manufacturer and the consumer, pipes with a diameter of over 70 to 219 mm are allowed to be made from 6 to 12 m;
multiples of length in multiples of at least 250 mm and not exceeding the lower limit established for measuring pipes. The allowance for each cut is set at 5 mm (if no other allowance is specified) and is included in each multiplicity.
Table 1
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Notes: 1. When manufacturing pipes in accordance with GOST 10706, the theoretical mass increases by 1% due to the reinforcement of the seam. 2. By agreement between the manufacturer and the consumer, pipes are manufactured with dimensions 41.5 × 1.5-3.0; 43´1.0; 1.53.0; 43.5'1.5-3.0; 52´2.5; 69.6 x 1.8; 111.8 x 2.3; 146.1 x 5.3; 6.5; 7.0; 7.7; 8.5; 9.5; 10.7; 152.4 x 1.9; 2.65; 168'2.65; 177.3 * 1.9; 198'2.8; 203 * 2.65; 299 * 4.0; 530'7.5; 720'7.5; 820'8.5; 1020'9.5; 15.5; 1220´13.5; 14.6; 15.2 mm, as well as with an intermediate wall thickness and diameters within the table. 1.
3. Pipe dimensions in parentheses are not recommended for new designs.
3.1. Pipes of measured and multiple lengths are manufactured in two classes of accuracy:
I - with end trimming and deburring;
II - without trimming and deburring (with cutting in the mill line).
3.2. Limit deviations along the length of the measuring pipes are given in table. 2.
Table 2
3.3. Maximum deviations along the total length of multiple pipes should not exceed:
+ 15 mm - for pipes of I class of accuracy;
+ 100 mm - for pipes of accuracy class II.
3.4. At the request of the consumer, pipes of measured and multiple lengths of accuracy class II must be with cut ends on one or two sides.
4. Limit deviations for the outer diameter of the pipe are given in table. 3.
Table 3
Note. For diameters controlled by perimeter measurement, the highest and lowest perimeter limits are rounded to the nearest 1 mm.
5. At the request of the consumer, pipes in accordance with GOST 10705 are manufactured with a one-sided or offset tolerance in the outer diameter. One-sided or offset tolerance should not exceed the sum of the maximum deviations given in table. 3.
6. Maximum deviations in wall thickness must correspond to:
± 10% - for pipe diameters up to 152 mm;
GOST 19903 - for pipe diameters over 152 mm for the maximum sheet width of normal accuracy.
By agreement between the consumer and the manufacturer, it is allowed to manufacture pipes with one-sided tolerance in wall thickness, while the one-sided tolerance should not exceed the sum of maximum deviations in wall thickness.
7. For pipes with a diameter of more than 76 mm, a thickening of the wall at the burr by 0.15 mm is allowed.
8. Pipes for pipelines with a diameter of 478 mm and more, manufactured in accordance with GOST 10706, are supplied with maximum deviations in the outer diameter of the ends, given in table. 4.
Table 4
9. Ovality and uniformity of pipes with a diameter of up to 530 mm inclusive, made in accordance with GOST 10705, should be no more than maximum deviations, respectively, in the outer diameter and wall thickness.
Pipes with a diameter of 478 mm and more, manufactured in accordance with GOST 10706, must be of three accuracy classes in terms of ovality. The ovality of the pipe ends should not exceed:
1% of the outer diameter of pipes for the 1st accuracy class;
1.5% of the outer diameter of pipes for the 2nd accuracy class;
2% of the outer diameter of pipes for the 3rd accuracy class.
The ovality of pipe ends with a wall thickness of less than 0.01 outside diameter is established by agreement between the manufacturer and the consumer.
10. The curvature of pipes made in accordance with GOST 10705 should not exceed 1.5 mm per 1 m of length. At the request of the consumer, the curvature of pipes with a diameter of up to 152 mm should be no more than 1 mm per 1 m of length.
The total curvature of pipes manufactured in accordance with GOST 10706 is not
