GOST 23786-79

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  ГОСТ 23786-79

GOST 23786−79 (ISO 5226−85) of drill Pipe of aluminum alloys. Specifications (with Amendments No. 1, 2, 3, 4)

GOST 23786−79
(ISO 5226−85)

Group В64

STATE STANDARD OF THE USSR

DRILL PIPES OF ALUMINIUM ALLOYS

Specifications

Drill pipes of aluminium alloys.
Specifications

GST 18 1250

Valid from 01.01.81
before 01.01.96*
_______________________________
* Expiration removed
Protocol 5−94 N Interstate Council
for standardization, Metrology and certification
(IUS N 11−12, 1994). — Note the CODE.

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 17.08.79 N 3159

2. The standard fully complies with ISO 5226−85

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph, enumeration, applications
GOST 9.011−79	6.2
GOST 515−77	6.3
GOST 631−75	3.16, 4.8, 5.10
GOST 632−80	3.16, 4.8, 5.10
GOST 1497−84	5.7
GOST 2789−73	5.6
GOST 4784−74	3.1
GOST 5286−75	3.15
GOST 7502−89*	5.2
GOST 7727−89	5.1
GOST 8828−89	6.3
GOST 10006−80	5.7
GOST 11739.1−90	5.1
GOST 11739.2−90	5.1
GOST 11739.3−82	5.1
GOST 11739.4−90	5.1
GOST 11739.5−90	5.1
GOST 11739.6−82	5.1
GOST 11739.7−82	5.1
GOST 11739.8−90	5.1
GOST 11739.9−90	5.1
GOST 11739.10−90	5.1
GOST 11739.11−82	5.1
GOST 11739.12−82**	5.1
GOST 11739.13−82***	5.1
GOST 11739.14−82****	5.1
GOST 11739.15−82	5.1
GOST 11739.16−90	5.1
GOST 11739.17−90	5.1
GOST 11739.18−90	5.1
GOST 11739.19−90	5.1
GOST 11739.20−82	5.1
GOST 11739.21−90	5.1
GOST 11739.22−90	5.1
GOST 11739.23−82	5.1
GOST 11739.24−82	5.1

________________
* Valid GOST 7502−98. Here and hereafter;
** A GOST 11739.12−98;
*** A GOST 11739.13−98;
**** Standards 11739.14−99. — Note the CODE.

5. REPRINT (October 1990) with Amendments No. 1, 2, 3, 4, approved in October 1987, September 1983, October 1985, June 1990 (IUS 12−81, 12−83, 10−85, 10−90)


This standard applies to the drill pipe of variable cross section of aluminum alloys manufactured by hot pressing.

Permitted 1 January 1992 to manufacture pipes in accordance with the application.

(Changed edition, Rev. N 4).

1. CLASSIFICATION

1.1. The pipes are divided

in the form section:

TB with the inner end thickening (wingtips), damn.1;

TBP with the inner end thickening (endings) and protective thickening, damn.2;

by kind of production:

no cut thread, damn.1, 2;

with the cut right-hand thread and screwed with steel locks, damn it.3;

mind strength:

normal strength;

high tensile strength PP;

accuracy of manufacturing of wall thickness of the main section:

normal accuracy;

high accuracy — P.

Damn.1

Damn.2

1 — coupler lock; 2 — pipe; 3 — valve lock

Damn.3

Pipes of high accuracy are made by agreement between manufacturer and consumer.

(Changed edition, Rev. N 4).

2. ASSORTMENT

2.1. Dimensions of tubes with internal end studs manufactured without threads, and maximum deviations thereon shall be as specified in the hell.1 and in table.1.

Table 1

mm
The outer diameter		The wall thickness of the end thickening		The thickness of the wall of the main section	Limit deviation of the wall thickness of the main section		The length of the end thickening
Nomin.	Pred. off.	Nomin.	Pred. off.	normal accuracy	increased accuracy	(PREV. off. )	(PREV. off. )
54	±0,6	13	±1,3	7,5	±0,7	±0,4	150	One hundred fifty
64	+1,5 -0,5	+1,5 A 1.0	8,0	±0,8	200	200
73	16	+2,0 A 1.0	9,0	± 0,9
90
95	+1,5 A 1.0	26	+2,5 -1,5	740	330
103	15	+2,0 A 1.0	250	250
108	27	+2,5 -1,5	8,0	± 0,8	750	450

2.2. Dimensions of tubes with internal end bulges, which are produced with right-hand thread chopped and screwed steel locks, and maximum deviations thereon shall be as specified in the hell.1 and in table.2.

Table 2

mm
Outer diameter (pred. off. )	The wall thickness of the end thickening		The thickness of the wall of the main section	Predelnye variations in the wall thickness of the main section		The length of the end thickening
Nomin.	Pred. off.	normal accuracy	increased accuracy	(PREV. off. )	(PREV. off. )
114	15	+2,0 A 1.0	10	±1,0	±0,5	1300	250
129	9	±0,9	±0,4
17	+2,5 -1,5	11	±1,1	±0,5
147	15	+2,0 A 1.0	9	±0,9	±0,4
17	+2,5 -1,5	11	±1,1	±0,5
20	13	±1,3	±0,5
22	+2,8 -1,7	15	±1,5	±0,5
24	17	±1,7	±0,5

2.3. The dimensions of the pipes with the inner end thickening an thickening, which are produced with right-hand thread chopped and screwed steel locks, and maximum deviations thereon shall be as specified in the hell.2 and in table.3.

Table 3

mm
Outer diameter (pred. off. )	The diameter of protec- Torno thickening (pred. off. )	The wall thickness of the end thickening (pred. off. )	The thickness of the wall of the main section	Limit deviation of the wall thickness of the main section		The wall thickness of the protective thickening (pred. off. )	The length of the end thickening		Length protec- Torno thickening (pred. off. ±50)
nor- Mal accuracy	increase increased accuracy	(PREV. off. )	(PREV. off. )
114	134	15	10	±1,0	±0,5	20	1300	250	300
129	150	17	11	±1,1	±0,5	21,5	1300	250	300
147	172	23,5
170	197	24,5
170	197	13	±1,3	±0,5	26,5

2.1−2.3. (Changed edition, Rev. N 4).

2.4. By agreement with the consumer allowed to manufacture pipes with dimensions listed in table.2 and 3, without thread and without locks.

At the request of the consumer it is allowed manufacture pipes intermediate sizes outside diameter, wall thickness and length of the end and tread bulges not listed in table.1−3. The maximum deviations for the outside diameter and wall thickness are taken as the nearest smaller size.

(Changed edition, Rev. N 2).

2.5. The nominal length of the pipes without protective thickening should be:

4.5 m for external pipe diameter of 54 mm;

5.3 m	"	"	"	"	64 mm;
9.0 m	"	"	"	"	St. 64 mm to 110 mm;
12.0 m	"	"	"	"	St. 110 mm.

The nominal length of pipes with protective thickening should be 12.0 m, regardless of the outer diameter.

2.5.1. Maximum deviations along the length of the pipe shall not exceed plus 150, minus 200 mm.

2.5.2. Allowed pipe extreme deviations in length no more than plus 300, minus 350 mm not more than 5% of the pipes of the party.

Examples of symbols

The drill pipe (TB) aluminum D16 alloy, quenched and naturally aged condition (T), normal strength, normal accuracy of production, with the inner end thickening, with an outer diameter of 147 mm and a wall thickness of main section 11 mm:

TB D16. T 147х11 GOST 23786−79

Same with protective thickening (TBP):

TBP D16. T 147х11 GOST 23786−79

The same high tensile strength:

TBP D16.T.PP 147х11 GOST 23786−79

The same high accuracy:

TBP D16.T.PP 147х11 P GOST 23786−79.

(Changed edition, Rev. N 4).

3. TECHNICAL REQUIREMENTS

3.1. Pipe shall be manufactured in accordance with the requirements of this standard according to the drawings approved in the prescribed manner.

Pipe shall be manufactured from aluminum alloy D16 with the chemical composition according to GOST 4784−74*.
________________

* Valid GOST 4784−97. — Note the CODE.

3.2. Pipe manufactured in quenched and naturally aged condition.

3.3. Mechanical properties of pipes normal to the tensile strength should conform to the standards specified in table.4.

Table 4

External diameter, mm	Mechanical properties, not less
Temporary resistance	Yield strength	Elongation , %
MPa (kgf/mm)
From 54 to 120	392 (40)	255 (26)	12
SV. 120	421 (43)	274 (28)	10

3.4. Mechanical properties of tubes of high tensile strength should conform to the standards specified in table.5.

Table 5

External diameter, mm	Mechanical properties, not less
Temporary resistance	Yield strength	Elongation , %
MPa (kgf/mm)
From 54 to 120	392 (40)	294 (30)	12
SV. 120	421 (43)	10

3.5. The outer and inner surfaces of the pipes should be clean. On the surface of the pipes is not permitted sinks, cracks, delamination, non-metallic inclusions and spots of corrosion origin.

3.5.1. Not allowed films, delamination, bubbles, nicks, scrapes, scratches, scores, dents, press fitting, if the depth defined by the reference sweep exceeds the limit deviation for wall thickness.

Allowed color of a tint, the dark and white spots, and traces of the technological lubricant.

3.6. On the outer surface of the tread bulges and transitions to it are not allowed the longitudinal separation, if their depth is determined by the control sweep is greater than 2.0 mm.

3.7. Allowed at the transition from thickening to the main section of the pipe one annular baffle provided that the wall thickness and inner diameter of the pipe requirements listed in table.1−3 and in Fig.

The magnitude of the contraction should take the tube outer diameter limit deviation:

plus or minus 1.0 and 2.0 mm — for pipes with an outer diameter 54 and 64 mm;

plus minus 2.5 and 5.0 mm for all other pipes specified in the table.1−3.

3.8. The macrostructure of the pipe must be free of cracks, cavities, delamination, utain, tears and rihlat.

Allowed:

nonmetallic inclusions of a size not more than 1.0 mm in an amount of not more than three pieces;

delamination depth is not more than 1.5 mm from the outer surface and not more than 3.0 mm from the inner surface.

3.9. The microstructure of the pipe after quenching should not have traces of burnout.

3.10. Pipe manufactured without locks, should be evenly cut, place the cut on the outer surface of the pipe should be free of burrs. Cut end Squareness, mm should not exceed 7.5 mm.

3.11. Ovality and raznoshennoy pipes should not display their sizes for maximum deviations, respectively from the outside diameter and wall thickness.

3.12. The curvature of the pipe at one metre length in the middle third of the length of the pipe should not exceed 1.5 mm, and in other areas, excluding protective thickening and the transitions from the main section of the pipe to the studs — 1.3 mm.

3.13. The deviation from coaxiality and protective thickening of the main pipe section adjacent to the transitional zone length must not exceed 7 mm.

(Changed edition, Rev. N 3, 4).

3.14. The length of the transition zones from the end thickening to the main section of the pipe and shall be not more than 300 mm from the protective thickening to the main section of pipe is not more than 1800 mm (see the devil.1, 2).

3.15. Requirements for locks shall be as specified in GOST 5286−75 or normative-technical documentation (NTD).

3.16. Requirements threads should correspond to GOST 631−75, GOST 632−80 or NTD.

3.17. The technology of manufacturing of pipes with locks must comply with NTD.