Date of introduction 01.01.77
la. This standard fully complies with ST SEV 1483-78.
(Introduced additionally, Amendment No. 2).
1. Outside diameter, wall thickness and theoretical mass of pipes must correspond to those indicated in table. 1.
(Modified edition, Rev. No. 1).
2. Depending on the ratio of the outer diameter ( D n ) to the wall thickness ( s ), pipes are subdivided into:
- especially thin-walled at D n / s more than 40 and pipes with a diameter of 20 mm or less with a wall of 0 , 5 mm or less;
- thin-walled at D n / s from 12.5 to 40 and pipes with a diameter of 20 mm and less with a wall of 1.5 mm;
- thick-walled at D n / s from 6 to 12.5;
- especially thick-walled when D n / s less than 6.
3. The length of the pipes must be made:
unmeasured length from 1.5 to 11.5 m;
measured length from 4.5 to 9 m with maximum length deviations of +10 mm; by order of foreign trade organizations, pipes are made in measured lengths from 4 to 9 m with maximum deviations in length +10 mm;
length, a multiple of the measured length, from 1.5 to 9 m with an allowance for each cut of 5 mm (unless another allowance is specified in the order) and with maximum deviations for the total length not exceeding those specified for pipes of measured length.
(Modified edition, Rev. No. 3).
4. Maximum deviations for the outer diameter and wall thickness of pipes should not exceed those indicated in table. 2.
5. By agreement between the manufacturer and the consumer, pipes can be manufactured with combined maximum deviations, for example, for the outer diameter - increased accuracy according to GOST 9567, and for wall thickness - with normal accuracy, or with one-sided dimensional tolerance. The value of the value of the one-sided tolerance should not exceed the sum of the two-sided limit deviations given in table. 2. In this case, the value of the theoretical mass of 1 m of pipes is calculated by the arithmetic mean of the sum of plus and minus limit deviations given in table. 2.
Table 1
Continuation of table 1
Continuation of table 1
Continuation of table 1
