Detailed explanation of tubing and casing markings

11 mark

11.1 General

11.1.1 Products manufactured in accordance with this specification shall be marked by the manufacturer in accordance with this specification.

11.1.2 For all manufacturers except threaders, the marking rules in Chapter 11 except 11.6 apply, and for threaders the marking rules in 11.5 and 11.6 and Table C.68 or Table E.68 apply Be applicable. The processor shall remove any identification marks (such as the original grade identification and the original pipe manufacturer’s name or logo) that do not show the new condition of the product due to heat treatment.

11.1.3 Products shall be color coded as specified in Section 11.4.

11.1.4 The products selected by the manufacturer shall be marked with lacquer, or both lacquer and printing shall be used. With the exception of the following two cases:

    —– Printing is required by the agreement between the supplier and the buyer. At this time, both lacquer printing and printing should be used together.

    —–At the option of the manufacturer, thermal roll printing or thermal printing can be used on the tube and the coupling instead of the mold printing logo, and allow printing along the full length of the tube at intervals.

11.1.5 The optional printing marks shall be as specified in 11.2, and the lacquer marks shall be as specified in 11.3. The description and sequence of marking shall be specified in Table C.68 or E.68, and only the printing and lacquering items for product identification are included in the table. If stencil print marks are selected, these are not required to be painted at the same time. An example of recommended identification is shown in Figure D.16. The markings are limited to not overlapping and not damaging the tube.

11.1.6 Additional notations for other compatible standards shall be listed after “ISO 11960”.

11.1.7 When re-marking the pipe with the original mark if necessary, the factory that re-marks the pipe shall be responsible for the correctness and traceability of the transfer mark. The transfer label shall have the words “transferred by —“, with “—” representing the name of the factory that relabeled the tube.

11.1.8 The date of manufacture at the manufacturer is identified by any of the following methods:

1. a) expressed in two digits representing the last digit of the year and the quarter;
2. b) It is represented by three digits, which represent the last digit of the year and two digits that represent the month.

11.1.9 When the products of the manufacturer have been produced according to the third edition of ISO11960, and the second edition of ISO11960 is still applicable (see the preface), the product identification of the overlapping period shall be replaced by “0” for the quarter and “00” for month. The product identification “0” or “00” during the overlap period applies to the tube body characteristics, not to the changes in API Spec 5B.

11.1.10 Other additional markings are permitted if desired by the manufacturer or required by the purchaser, but shall be marked after the markings specified in Table C.68 or E.68.

11.2 Printing Mark Requirements

11.2.1 Methods

The methods that allow printing of markup are as follows:

serial number	method
1	Hot roll or hot embossed marking
2	Cold printing with standard stencils
3	Cold Printing with Intermittent Spot Die
4	Cold printing using round stencils
5	Vibration printing

After printing the marking, Group 2 and Group 4 products may require subsequent heat treatment as specified in 11.2.5. This heat treatment is carried out as specified in 6.2. The printing marking sequence is performed according to Table C.68 or Table E.68.

11.2.2 Dimensions

The print mark size shall be as shown in Table C.65 or E.65.

11.2.3 Location

For casing, liner and oil pipe whose specification code 1 is not less than 1.660, a mark shall be printed on the outer surface of each pipe, and the marking position shall be away from the coupling, female threaded end, and either or both ends of the pipe with male thread. within approximately 0.3mm (1ft) of either end. For the marking on the pipe with specification code 1 less than 1.660, it can be printed on the metal label of each pipe or each bundle of oil pipes.

11.2.4 Groups 1 and 3

When specified by the purchaser in the purchase order, the manufacturer may choose any one or more of the methods specified in 11.2.1 to print the product.

11.2.5 Groups 2 and 4

When specified by the purchaser in the purchase order, the manufacturer may choose any one or more of the methods specified in 11.2.1 to print the product. In addition, the following provisions apply:

—– Group 2 (except C90 and T95 grades) products, after method 2 of 11.2.1, shall be heat treated.

—– Group 2 (Grades C90 and T95 only) and Group 4 products shall be heat treated after methods 2 and 4 of 11.2.1 are applied, except in the following cases:

     —– Indicates the triangular mark that the coupling is tightened;

     —–When the original printed mark is removed by grinding, machining, threading or cutting head, its removal depth shall not be less than twice the printing depth;

     —–Print marks that are not removed by agreement between the supplier and the buyer.

11.2.6 Triangular mark indicating coupling tightening

For all sizes and grades of buttress casing and round threaded casing of grades H40, J55, K55 and M65 with specification code 1≥16, the triangle mark indicating the tightening of the coupling shall be printed on the two sides of each pipe. on the outer surface of the end. After negotiation between the purchaser and the manufacturer, the triangular mark indicating that the coupling is tightened can be replaced by a horizontal white paint strip (around the pipe body) with a width of 10mm (3/8in) and a length of 76mm (3in). In order to facilitate the positioning of the triangle or white paint strip on the buttress-shaped casing, a white paint strip with a width of 25mm (1in) and a length of 610mm (24in) should be painted and printed at the field end along the longitudinal direction of the pipe near the triangle or white paint strip. ; In addition, near the factory end triangle or annular paint strip, a white paint strip 25mm (1in) wide and 100mm (4in) long should be repainted along the longitudinal direction of the pipe.

For Group 1 and Group 3 triangular marks, only Method 2 or Method 4 should be used for printing.

Triangular markings for Group 2 (C90 and T95 grades only) shall be printed using Method 3 only.

For Groups 2 (except C90 and T95 grades) and Group 4, triangular marks shall be printed using Method 3 or Method 4 only.

11.3 Lacquer Marking Requirements

The paint mark shall be located on the outside surface of the pipe, within 0.6 m (2 ft) or more from the coupling or female end, either end of plain end pipe, either pipe end of male pipe at both ends, or either end of the coupling blank Carried on. For accessories and short joints with a length of less than 1.8m (6ft), the lacquer marks can be affixed with printed paper tapes within 0.3m (1ft) from the pipe end, and these marks shall be separated by dotted lines or at an appropriate distance.

Except for the thread type marking, which shall be painted at a location deemed convenient by the manufacturer, the order of the remaining paint markings shall be as specified in Table C.68 or E.68.

11.4 Color scale

11.4.1 Methods

Unless otherwise specified on the order, each product shall be color-coded in accordance with 11.4.2~11.4.6.

11.4.2 Products 1.8m (6ft) or longer

One or more of the following methods should be used:

1. a) Threaded pipes, pup joints and accessories: At a distance of not more than 0.6m (24in) from the end of the coupling or the end of the female thread, wrap a strip of lacquer ink around the product.
2. b) Products with flat ends or external threads at both ends: a lacquer ribbon around the product at a distance of no more than 0.6m (24in) from either end.
3. c) Couplings: Paint the entire surface of the coupling, including the corresponding coupling ribbon.
4. d) If the pipes are supplied with special clearance couplings or the steel grades of the pipes and couplings are different (except for the H40, J55 and K55 grades permitted in 9.2.1), the corresponding Tubes and couplings painted.

11.4.3 Disconnected Couplings

    Paint the entire surface of the coupling, including the corresponding ribbon.

11.4.4 Special Clearance Couplings

    Special clearance couplings shall be painted to indicate the grade color of the steel used to manufacture the coupling, and a black band shall be painted around the center.

11.4.5 Pup joints and accessories less than 1.8m (6ft) in length

    Paint the entire surface, including the corresponding ribbon, except for the threads.

11.4.6 Steel grade color code

    The colour and number of bands for each grade are shown in Table C.66 or Table E.66.

11.5 Thread and End Machining Marks —–All Groups

11.5.1 API thread marking

    The manufacturer shall paint the thread type on the casing to identify whether it is round, stepped, or straight. For thread mills, casing and tubing are required to have thread identification. The marking of threads shall be carried out in accordance with Table C.67 or Table E.67.

11.5.2 Unmachined and special end machining markings

    Different markings are required for the following cases:

1. a) Supplied with thickened or non- thickened plain end pipe; or
2. b) pipe with a special end-finishing type not specified here, and the pipe body is produced as specified herein; or
3. c) Complete couplings and complete accessories with special end preparations not specified here, meeting all other requirements specified herein except for dimensions.

  Marking shall be performed in accordance with Table C.68 or Table E.68.

11.6 Pipe Threading Factory Marking Requirements—–All Groups

   Pipes threaded by a factory other than the original pipe manufacturer shall have the threader’s name or trademark, specification marking and Section 11.5, Table C.67 or E. 67 listed thread sizes and types.

   Unless the pipe has been pretested to the pressure values ​​specified in Tables C.45~C.61 or Tables E.45~E.61 for the thread types shown in Tables C.45~C.61 and marked as specified in Table C.68 or Table E.68 The processing plant should mark the actual hydrostatic test pressure value on the pipe body.

For example: specification code 1 is 7, specification code 2 is 29.00, C95 long round thread coupling

   Case 1) If the pipe manufacturer produces 177.8 m (7 in) UF (semi-finished) pipe, perform a hydrostatic test at 34.5 MPa (5000 psi) according to the inspector’s procedure document (see 10.12.3), and conduct the test on the pipe body If marked with P34.5 (P5000), then the thread maker should carry out the hydrostatic test at 60.5MPa (8800psi) and mark it according to Figure D.16.

   Case 2) If the pipe manufacturer produces UF (semi-finished) pipe, the hydrostatic test is carried out at 61.0MPa (8900psi), and the pipe body is marked with P61.0 (P8900), and the thread processing plant does not need to carry out hydrostatic Test or mark the test pressure.

   The pipe body markings used by the original pipe manufacturer shall not be removed or replaced.

   The use of the letters “API” to determine or certify that threads on tubing conform to API Spec 5B is not permitted.

12 Coating and Protection

12.1 Coating —– all groups

12.1.1 Protective coating during transport

    Unless otherwise specified by the purchaser, pipes and couplings shall be coated on the outside to prevent corrosion of the casing during transportation. The coating should be smooth, dense and not easy to fall off. The coating should protect the pipe from rusting for three months. If not specified by the purchaser in the order, the outer surface of the coupling blank need not be coated (bare) other than a protective layer over the paint print.

    If the tube does not require coating or requires special coating, it should be indicated on the order. For orders requiring special coating, it should be indicated whether the coating is the full length of the pipe or the inner coating at a certain distance from the end of the pipe. Unless otherwise specified, uncoated parts should be coated with oil to prevent rusting during shipping.

Note: When 13Cr pipes are stored in a humid environment, local pitting corrosion will occur, so effective protective measures should be taken during coating, shipping and storage.

12.1.2 Coatings for long-term storage

    By agreement between the supplier and the buyer, in order to prevent corrosion, especially when the pipe needs to be stored in an offshore environment for a long time, the inner and outer surfaces of the pipe need to be protectively coated.

    The following shall apply:

1. a) During the long-term storage period negotiated between the supplier and the purchaser, the protective coating to prevent corrosion in the offshore environment shall be effective for a long time, and the minor surface fading shall be acceptable.
2. b) The protective coating does not need to be removed before the pipe is connected
3. c) Correct application of the coating is necessary and the following factors should be considered:

    —– Dryness of the tube

—– Cleanliness of the tube

—– Coating temperature

—– Thickness of coating film