GOST 6238-77

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  ГОСТ 6238-77

GOST 6238−77 casing and coring Tubes for Geology-exploring drilling and nipples for them. Specifications (with Amendments No. 1, 2, 3, 4)

GOST 6238−77

Group В62

INTERSTATE STANDARD

CASING AND CORING TUBES FOR GEOLOGY-EXPLORING DRILLING AND NIPPLES FOR THEM

Specifications

Casing and coring pipes for geology-exploring drilling and nipples for them. Specifications

ISS 23.040.10
OKP 13 1900, 13 4400

Date of introduction 1986−01−01

INFORMATION DATA

1. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 16.05.77 N 1211

2. REPLACE GOST 6238−52

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

4. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 9−93)

5. EDITION (April 2010) with Changes No. 1, 2, 3, 4*, approved in August 1982, January 1986, August 1988, February 1993 (IUS 12−82, 5−86, 12−88, 9−93)
________________
* The change is effective on the territory of the Russian Federation.

This standard applies to steel seamless casing and coring pipes and nipples to them, used for well casing and coring in geological exploration drilling, and the threads of the pipes and nipples, and the interrelated products.

The standard does not apply to dual core barrels and coring tube of a pipe used in the coring shells with removable core receiver.

(Changed edition, Rev. 3).

1. TYPES AND BASIC DIMENSIONS

1.1. Pipe manufactures the following types:

beznapornye — connecting in the casing «pipe in pipe»;

nipple — included in single core kits, consisting of one or more interconnected core pipes nipple or connecting in the casing with the nipples.

1.2. Size benippled casing pipe shall be as specified in the hell.1 and in table.1.

Damn.1

(Changed edition, Rev. N 1, 2, 3).

Table 1

Dimensions, mm

Notes:

1. The angles of the thrust ledge, the thrust end face and an inner chamfer must be provided by the design of the cutting tool and the pipe are not controlled.

2. Angle lead-in chamfer of the thread is a reference.

3. At the customer’s request is possible to supply up to 10% of the party of pipes lengths that are multiples of 1500 mm, with a maximum deviation of ±70 mm.

4. At the customer’s request is possible to supply pipes of greater length.

5. When calculating the theoretical mass density of steel is equal to 7.85 g/cm.

1.3. The dimensions of the core and casing threaded connections and tappings shall be as specified in the hell.2 and in table.2.

1 — pipe; 2 — nipple

Damn.2

Table 2

Dimensions, mm

Notes:

1. The angles of the thrust ledge and thrust the end of the pipe and nipples provided the design of the cutting tool and the finished products are not controlled.

2. Angle lead-in chamfer of the thread is a reference.

3. Casing pipes manufactured non-standard length. By agreement with the consumer allowed the party to 10% of pipe lengths that are multiples of 1500 mm, with maximum deviations of ±70 mm.

4. At customer’s request, produce pipe of greater length.

5. It is possible to manufacture nipples with a length of thread with a full profile of 30 mm for nipple diameter of 33.5−89 mm and equal to 50 mm for nipple diameter 108 mm and more.

6.* At the request of the customer can be manufactured pipes without thread.
________________
* Valid on the territory of the Russian Federation.

Core pipes are manufactured in diameter 25−108 mm, casing pipe nipple joint diameter 73−146 mm.

(Changed edition, Rev. N 3, 4).

1.4. Ovality and raznoshennoy pipes should not print sizes for maximum deviations, respectively from the outside diameter and wall thickness.

1.5. Napravlennosti (curvature) tubes on 1 m of length shall not exceed:

the usual precision:

0.7 mm — for pipes with a diameter from 25 to 89 mm;

1.0 mm — for pipes with diameter from 108 to 146 mm;

increased accuracy:

0.3 mm — for pipes with a diameter from 33.5 to 73 mm;

0.5 mm — for pipes with a diameter from 89 to 146 mm.

(Changed edition, Rev. N 3).

1.6. The thread size of casing and coring pipes shall be as specified in the hell.3 and in table.3 and 4.

1 — female thread; 2 — external thread

Damn.3

Table 3

Table 4

Dimensions, mm

Note. Allowed a gradual increase in the diameter of the thread of a nipple (not more than 0.2 mm) resistant ledge over a length of no more than 15 mm, preventing sinivuori with the pipe.


(Changed edition, Rev. N 1, 2, 3).

1.7. Maximum deviations in width of the coil or minus 0.12 mm.

1.8. Limit deviations on width of trench plus 0.12 mm.

1.9. Deviations in thread pitch should be offset by a corresponding reduction of the thickness of the coil (increase the width of the basin) within a tolerance range.

1.10. On the tops of the coil allowed the chamfer to a radius of not more than 0.15 mm, and the depressions has a radius not more than 0.10 mm.

1.10*. The peaks and troughs threads of pipe and nipples are allowed, rounded to a radius of not more than 0.25 mm.
________________
* Valid on the territory of the Russian Federation.


The radii at the peaks and troughs of the thread profile and angles of the side profile of this for the design of the threading tool and on the finished product they do not control.

This should be sinivuori the nipple with the pipe.

(Changed edition, Rev. N 4).

1.11. Out-of-round thread tubing and nipple, bores and the groove diameter must not exceed:

0.5 mm, for pipe and nipple diameter 25−89 mm;

0.6 mm — for pipes and nipples with a diameter of 108 mm and more.

Examples of symbols

Beznapornye the casing pipe with a diameter of 73 mm, with right-hand thread, the usual precision, material strength group D:

Casing bn 73-D GOST 6238−77

The same manufacturing high precision:

The casing pipe 73 bn P-D GOST 6238−77

Same with left-hand thread:

The casing pipe 73 bn P-L-D GOST 6238−77

The same lengths (length 3000 mm):

Casing bn 73 Пх3000-L-D GOST 6238−77

The casing pipe threaded connections with a diameter of 73 mm with wall thickness 5 mm, material strength group D:

Casing N 73х5-D GOST 6238−77

The same, with a wall thickness of 4 mm:

Casing N 73х4-D GOST 6238−77

The same lengths (length 4500 mm):

Casing N 73х4х4500-D GOST 6238−77

The coring tube with a diameter of 73 mm with wall thickness 5 mm, length 3000 mm, material strength group To:

Pipe coring To 73х5х3000 To GOST 6238−77

The same, with a wall thickness of 4 mm:

Pipe coring To 73х4х3000 To GOST 6238−77

The nipple outer diameter of 73 mm of material strength group D:

The nipple 73-D GOST 6238−77

(Changed edition, Rev. N 3).

2. TECHNICAL REQUIREMENTS

2.1. Casing and coring pipes for Geology-exploring drilling and nipples for them must be manufactured in accordance with the requirements of this standard.

2.2. On the surface of the pipe are not allowed cracks, slivers, flaws and sunsets.

Some minor nicks, dents, risks, thin layer of oxides, traces of Stripping defects and small slivers are allowed if they do not take wall thickness outside negative deviations.

2.3. Casing and coring tubes and nipples for them are made of steel strength groups D, K, and M. the Mass fraction of sulfur and phosphorus shall not exceed 0,045% each.

Casing and coring pipes of strength group M are made by agreement between manufacturer and consumer.

Coring pipe diameters 25−73 mm are made cold.

(Changed edition, Rev. N 3).

2.4. The mechanical properties of the pipe and nipples shall be as specified in table.5.

Table 5

Note*. On pipes of strength group D, respecting the norm of yield stress rate on tensile strength is not a rejection feature.
________________
* Valid on the territory of the Russian Federation.


(Changed edition, Rev. N 3, 4).

2.5. Threaded pipes and nipples may be right and left. Coring tubes are made only with right-hand thread.

2.5. Threaded pipe and nipples must be smooth and free of flaws and other defects that violate the continuity and solidity.

On the surfaces of the bores and grooves of the thread are allowed traces of the threading tool.

(Changed edition, Rev. N 1, 3).

2.6. Geometrical axis of the threads of both ends of the nipple should be the same.

Deviation from alignment in the plane of any of the pin nose should not exceed 0,6 mm.