Circular pipes

  • Water and gas pipes
  • Straight-line-seam electric-welded pipes
                                              

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Water and gas pipes

Steel water and gas pipes (GOST 3262-75)

This group includes ungalvanized and galvanized steel welded pipes used for water and gas supply systems and for heating systems and as construction parts as well. Pipes can be manufactured of the length from 4 to 12 m:

•  а) fixed or multiple fixed length with allowance for each cut of 5 mm and longitudinal deviation for total length plus 10 mm;
•  b) random length

The manufacturer and customer may agree that the lot of random length pipes allows up to 5% of pipes with the length 1,5 … 4 m.
The decrease of pipe internal diameter to 10 % through the total length of thread is allowed for knurled thread. The weight of 1 m of pipes is calculated with the density of steel equal to 7,85 g/cm. Galvanized pipes are heavier than ungalvanized by 3%. 

Note: The increasing extreme deviation of the wall thickness is limited by extreme deviations of the weight of pipes. Pipes of normal accuracy are used for water and gas supply systems, and for heating systems. Pipes of increased accuracy are used for water and gas supply construction parts. Extreme deviations by the weight of pipes shall not exceed  +8%. The customized extreme deviations by the weight shall not exceed: +7,5% - per lot; + 10% - per pipe. The pipe curvature for shall not exceed1 m of length: 2 mm – with a nominal bore not exceeding 20 mm; 1,5 mm – with nominal bore over 20 mm.


 

Parameters of water and gas pipes (GOST 3262-75)

DU Reference character External diameter, mm, A Light Normal Reinforced
Wall thickness, mm, B  Weight 1m, kg Meter per ton    Wall thickness, mm, B  Weight 1m, kg Meter per ton    Wall thickness, mm, B Масса 1м, кг Метров в тонне
15 21,3 2,5 1,16 862,7 2,8 1,28 782,8 3,2 1,43 700,1
20 26,8 2,5 1,5 667,5 2,8 1,66 603,4 3,2 1,86 536,9
25 33,5 2,8 2,12 471,7 3,2 2,39 418,2 4 2,91 343,6
32 42,3 2,8 2,73 366,6 3,2 3,09 324,1 4 3,78 264,7
40 48 3 3,33 300,4 3,5 3,84 260,3 4 4,34 230,4
50 60 3 4,22 237,1 3,5 4,88 205,1 4,5 6,16 162,4


Straight-line-seam electric-welded pipes

Steel straight-line-seam electric-welded pipes (GOST 10704-91)
Straight-line-seam electric-welded pipes are often used for pipe laying and metal structures production.
Steel straight-line-seam electric-welded pipes (GOST10704-91) are manufactured by fixed length:

•  with max. diameter 70 mm - from 5 to 9 m;
•  with diameter 70 … 219 mm - from 6 to 9 m;
•  with diameter 219 … 426 mm - from 10 to 12 m.

Pipes with diameter beginning from 426 mm and more are manufactured only of random length. By agreement with customer, pipes with diameter from 70 to 219 mm are allowed to be produced from 6 to 12 m;

Multiple length – minimal multiplication factor 250 mm, not exceeding a lower limit set for fixed length pipes. Allowance for each cut is 5 mm (where otherwise is not agreed) and is considered for each multiplication factor.

Note: When manufacturing pipes under GOST 10706, theoretical weight is increased by 1% because of the weld reinforcement. By agreement between manufacturer and customer, pipes of the following sizes can be produced: 41,5x1,5-3,0; 43x1,0:1,5-3,0; 43,5x1,5-3,0; 52x2,5; 69,6x1,8; 111,8x2,3; 146,1x5,3; 6,5; 7,0; 7,7; 8,5; 9,5; 10,7; 152,4x1,9; 2,65:168x2,65; 177,3x1,9; 198x2,8; 203x2,65; 299x4,0; 530x7,5; 720x7,5; 820x8,5; 1020x9,5; 15,5; 1220x13,5; 14,6; 15,2 mm, and also, with intermediate thickness of the wall and diameters as in the table (stated below).

Pipes of fixed and random length are manufactured of two classes of length:

•  I – end cutting and removal of burrs;
•  II – no end cutting and removal of burrs (cutting in mill train)

Marking sample: Pipe of external diameter: 76 mm, wall thickness: 3 mm, fixed length, class 2 of length accuracy, steel grade:  StЗсп (killed), manufactured under group В (GOST 10705-80):

•  76x3x500011 (GOST 10704-91)
•  Pipe В-StЗсп (killed) (GOST 10705-80)


Performances of steel electric-welded pipes (GOST 10704-91)

External diameter, mm, А Wall thickness, mm, В Weight 1m, kg Meters per ton
57 3 4 250
3,5 4,62 216,5
4 5,23 191,2
76 3 5,4 185,2
3,5 6,3 158,7
4 7,1 140,8
89 3 6,4 156,3
3,5 7,4 135,1
4 8,4 119
102 3 7,32 136,6
3,5 8,5 117,6
4 9,7 103,1
108 3 7,77 128,7
3,5 9,02 110,9
4 10,26 97,5
114 3 8,21 121,8
3,5 9,54 104,8
4 10,85 92,2
127 3 9,18 108,9
3,5 10,66 93,8
4 12,13 82,4
133 3 9,62 104
3,5 11,18 89,4
4 12,73 78,6
159 4 15,3 65,4
4,5 17,15 58,3
5 18,99 52,7
219 4 21,21 47,1
5 26,39 37,9
6 31,52 31,7

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zbut@savvats.com.ua

 

 

 

 

 

 



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