Gost R 50278-92. Drill pipes with welded-on tool joints. Technical conditions
Are you interested in GOST P50278-92? Supplier Evek GmbH offers to buy a drill pipe with welded locks at an affordable price in a wide range. We provide product delivery anywhere in the continent. The price is optimal.
General Information
GOST P50278-92 apply to steel seamless pipes with upset ends and welded-on tool joints, used for construction of oil and gas wells. The climatic conditions of application are from 1 to 11 according to
- PV - with internal upsetting;
- PK - with combined landing;
- PN - with external landing.
Locks should have rectangular or conic shoulder under elevator. Threads may be right or left. Pipes with welded-on tool joints shall be manufactured in three length groups according to the table below.
| Parameter Name | Length group | ||
| 1 | 2 | 3 | |
| Tube length, m | 5,9-6,3 | 8,0-8,6 | 11,9-12,5 |
| Notes 1. The length is defined as the distance between the nipple stop ledge and the stop end of the socket lock. 2. Pipe diameters 60, 73 and 89 mm are manufactured in three length groups, and 102, 114, 127 and 140 mm only in the second and third length groups. | |||
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Technical requirements
Pipe should be made according to the requirements of this standard according to the technological rules approved in the established order.
The external and internal surfaces of pipes shall be free of films, shells, rolls, delamination, cracks, grit and tears. The above mentioned defects may be cut out and mended only along the pipe axis provided such cutting and mending do not lead to wall thickness outside the minus deviation limits. No welding, filling or caulking of the defects is allowed.
Quality requirements
In areas where the wall thickness can be directly measured, the depth of the defects can exceed the minus deviation limit, provided the minimum wall thickness, defined as the difference between the nominal wall thickness and the minus deviation limit for the pipe wall, is maintained. Some minor dents, dents, risks, thin layers of scale and other defects are acceptable due to the manufacturing procedure, provided they do not bring the wall thickness outside the minus deviation limits.
The surface of the upset part of pipe and its transition point to the part with wall thickness shall not have sharp ledges.
Steels used
Pipes shall be manufactured of steel of strength groups D, E, L, M and P.
The mass fraction of sulphur and phosphorus in steels shall be:
- not more than 0,035% for each component - for pipes of strength groups D, E, L;
- not more than 0.020% for each component - for pipes of strength groups M and P.
Pipes of all strength groups must be heat-treated along the whole length after upsetting the ends. Mechanical properties of pipe metal after heat treatment shall comply with those presented in the Table.
| Name of parameter | Standard mechanical properties of steel of strength group | ||||||
| Д | Е | Л | М | Р | Т | У | |
| Temporary resistance, MPa (kgf/mm2), not less | 655 (66,8) |
689 (70,3) |
724 (73,8) |
792 (80,8) |
999 (101,8) |
1104 (112,5) |
1241 (126,6) |
| Yield strength, MPa (kgf/mm2): | |||||||
| not less than | 379 (38,7) |
517 (52,7) |
655 (66,8) |
724 (73,8) |
930 (94,9) |
1035 (105,5) |
1170 (119,0) |
| no more than | - | 724 (73,8) |
862 (87,9) |
930 (94,9) |
1138 (116,0) |
1241 (126,0) |
1379 (140,0) |
| Relative elongation, %, not less | 16 | 14 | 14 | 12 | 12 | 11,5 | 10,5 |
| Relative contraction after rupture, %, not less | 50 | 50 | 50 | 45 | 45 | 40 | 40 |
| Impact toughness KCV J/cm (kgsm/cm2), not less | 690 (7) |
690 (7) |
690 (7) |
690 (7) |
690 (7) |
- - |
- - |
| Note. - Strength groups T and Y have been introduced into the standard as advanced. Pipes of T and U groups may be manufactured in accordance with standard technical documentation. | |||||||
Heat Treatment of Welds
Welded seam area after deburring shall be heat treated. Heat treatment area (hardening, normalization) must overlap the heat affected zone of welding, tempering zone must not extend beyond the cylindrical part of upset pipe ends and nipples and socket joints.
Welded seam surface
The outside and inside surfaces of the welded joint shall be machined along the entire length of the cylindrical portion of the depressed pipe ends and nipples and socket locks to the dimensions given in Tables 1 and 2. No gouges are allowed in the pipe body on the inner and outer surfaces during machining. On the inner surface of the welded joint a coarse pitch mark from the exit of the cutting tool not exceeding the upper tolerance of the inner diameter of the welded joint is allowed.
weld
Roughness
Roughness of treated external surfaces shall be not more than 80 microns, internal surfaces - not more than 130 microns according to
Welded joint shall be subjected to bend test. Mutual offset of the outside surface of pipe and outside surface of interlocking parts shall not exceed 1,2 mm.
Marking
The marking shall comply with
- - Manufacturer's trade mark; nominal diameter, mm;
- - nominal wall thickness (whole number), mm;
- - strength grade;
- - month and year of manufacture (the last two digits);
- - pipe number.
Buy. Supplier, price
Are you interested in GOST P50278-92? Supplier Evek GmbH offers to buy drill pipe with welded locks at an affordable price in a wide range. We provide product delivery anywhere in the continent. The price is optimal. We invite you to partner cooperation.
