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Execution
standards
| STAS
7657 |
Longitudinally welded steel
pipes for metallic constructions, plants and general purpose
pipe lines |
| Dimensions
and linear weights |
According to STAS 7657,
see table 5.1 |
| Steel |
OL 32, OL 34, OL 37 |
| DIN
1615 |
Welded circular tubes of
non-alloy steel without special quality requirements |
| Dimensions
and linear weights |
According to DIN 2458 |
| Steel |
St 33, St 37.2 |
| DIN
EN 10219-1,2 |
Tubular profiles, welded,
cold manufactured for metallic constructions of non-alloy steels
and of steels of fine granulation |
| Dimensions
and linear weights |
According to DIN 2458 |
| Steel |
S 235 JRH |
| GOST
10704 |
Electrically welded steel
line - weld tubes |
| Dimensions
and linear weights |
According to GOST 10704 |
| Steel |
St 1, St 2, St 3, 10 |
| GOST
10705 |
Electrically welded steel
line - weld tubes |
| Dimensions
and linear weights |
According to GOST 10705 |
| Steel |
St 1, St 2, St 3, 10 |
Note: By agreement between
parties, tubes of other typified steel grades can be maufactured,
with the maximum tensile strenght 490 N/mm2.
QUALITY
TECHNICAL CONDITIONS ACCORDING TO
STAS 7657
| 1. Pipe
category |
| CMH - guarantee
of chemical, mechanical requirements and hydrostatic pressure
resistance |
| M - guarantee
of mechanical requirements |
2.
Dimensions
and linear weights according
to STAS 7657 (Table
5.1)
|
Outside
diameter (mm)
|
Wall
thickness (mm)
|
|
2,60
|
2,90
|
3,20
|
3,60
|
4,00
|
4,50
|
|
Linear
weight (kg/ml)
|
|
21,30
|
1,20
|
1,32
|
1,43
|
-
|
-
|
-
|
|
26,90
|
1,56
|
1,72
|
1,87
|
-
|
-
|
-
|
|
33,70
|
-
|
2,20
|
2,41
|
2,67
|
2,93
|
-
|
|
42,40
|
-
|
2,82
|
3,09
|
3,44
|
3,79
|
-
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|
48,30
|
-
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3,25
|
3,56
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3,97
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4,37
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-
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|
51,00
|
-
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-
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3,77
|
4,21
|
4,64
|
-
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|
57,00
|
-
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-
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4,25
|
4,74
|
5,23
|
-
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60,30
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-
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-
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4,51
|
5,03
|
5,55
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6,19
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|
63,50
|
-
|
-
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-
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5,32
|
5,87
|
6,55
|
|
76,10
|
-
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-
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-
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6,44
|
7,11
|
7,95
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88,90
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-
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-
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-
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7,57
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8,38
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9,37
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114,30
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-
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-
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-
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9,83
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10,90
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12,20
|
3.
Tolerances
| 3.1
Permissible variantions in wall thickness |
|
wall
thickness < 3 mm
|
+ 0,30%
/ - 0,25%
|
|
wall
thickness >= 3 mm
|
+ 0,45%
/ - 0,35%
|
| 3.2 Permissible
variantions in outside diameter |
max. +/- 1%
|
4.
Lenghts
| - random
lenghts |
4
- 6 m
|
| -
fixed lenghts within the manufacture lenghts of 6000 +/- 100
mm |
5.
Material
The longitudinally
welded steel tubes for construction are manufactured of hot
rolled steel strip, according to STAS 908 and STAS 9236, steel
grade OL32 and OL 37, according to STAS 500/2.
Note: By agreement between parties, tubes of other typified
steel grades can be manufactured, with the maximum tensile strenght
of 490 N/mm2.
6.
Hydrostatic test pressure
- max 50
bar or eddy currents check according to SEP 1925, only for CMH
category.
7.
Other
quality checks
-
tensile testing;
- flattening test (at customer's request);
- bend testing (at customer's request);
- checking of chemical analysis on pipe (at customer's request);
- electromagnetic test (only for CMH category).
DELIVERY,
MARKING, PACKING, DOCUMENTS
-
the pipes are delivered unprotected;
- the pipes are delivered in bundles with fixed number of pieces,
packed in hexagonal shape, tied in minimum five places with
steel strips;
- a tag will be attached to each bundle;
- each lot of pipes will be accompanied by the mill test certificate
according to EN 10204/DIN 50049;
- the delivery will be made by railway, truck or ship.
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