Packing of Pipes
Banding of round pipes is made with the use of rope wire of 6 mm diameter according to GOST 3282-74 . Banding of square and rectangular pipes is made with the use of cold- rolled band (0,8 1,0x30 mm), GOST 3560-73. The bundle mass must not be over 10 tn.
The batch is collected of packs consistently produced at electric-weld pipe mill. The pack of pipes must include pipes of the same dimensions and diameter. Every pack of pipes must have tag.
Example of Metal Tag
Pipes marking in accordance with API 5L (44 edition)
XXX ISO3183 XX XX XX PSL XX XX XX
1 2 3 4 5 6 7
1 – Name of manufacture or producer’s mark;
2 – Nominal outside diameter;
3 – Conditional wall thickness;
4 – Steel grade;
5 – Pipe type;
6 – Inspector’s sign (if used);
7 – Identification number
Example for SI units:
DPW ISO3183 323.9 12.7 X56 PSL1 HFW XXX XXX
Example for USC units:
DPW ISO3183 12 0.500 X56 PSL1 HFW XXX XXX
GOST 10705-80 Electrically welded tube described for the constructionof trunk oil pipelines.Steel pipes are of a diameter from 426 to 1620 mm and made of steel St2, St3 of all degrees of deoxidation. Manufactured pipecan be divided in terms of quality into several groups:
And - the mechanical properties
B - on the chemical composition
B - on the chemical composition and mechanical properties
D- no normalization of mechanical properties and chemical composition, but with a valuation of hydraulic pressure
For use in the main heating pipe network should be izgotavleny heat-treated steel grades St3sp categories 4 and 5. After the heat treatment tube branded mark "T".
Chamfer on the ends of pipes must beat an angle of 25-30 degrees to the end of the pipe. At the request of the client chamfer bevel angle can be increased up to 30-35 degrees.
All pipes are tested by hydraulic pressure. Number of tubesin the party must not exceed 100 units.
Completethe requirements of GOST10705-80 can be foundin 219 - ГОСТ 10705-80.pdf document.
GOST 20295-85 Welded Pipe describes the construction of trunk oil pipelines.
Steel tubes longitudinally welded and spirally in diameter are from 159 to 820 mm. They are made of three kinds:
Longitudinal diameter of 159-426 mm, made contact welding by high-frequency
159-820 mm diameter spirally constructed arc welding
Longitudinal diameter of 530-820 mm, manufactured by arc welding
Pipes can be made of thermally treated (over the entire volume or weld) and without heat treatment, depending on the strength class.
The pipes are made of different strength classes, depending on the mechanical properties: K34, K38, K42, K50, K52, K52, K55, K60.
The manufacturer selects the grade of steel to meet the requirements of the mechanical properties of the norms and restrictions limiting the content of the elements were in accordance with GOST 380, GOST 1050 and GOST 19281.
Tube length can be from 10.6 to 11.6 meters. Pipe ends must be cut at right angles. If the pipes have a wall thickness of 5 mm or more, they should be chamfered at an angle of 25-30 degrees.
Complete the requirements of GOST 20295-85 can be found in 3900 - ГОСТ 20295-85.pdf document.