BS 1387 - Durgapur Tube Pvt. Ltd.

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# BS 1387

##### 1. BS 1387 'Light'

- Dimensions and masses are in accordance with ISO 65 'Light Series II'.

##### 2. BS 1387 'Medium and Heavy'

- Maximum and minimum outside diameters meet the requirements of ISO 65.
- Thicknesses and masses are in accordance with ISO 65.

##### 3. Methods of Calculation

- The values have been calculated to at least five significant figures in accordance with the formula in ISO 65:
- For the metric system:
  - m = 0.0246615 * (D - t)t kg/m (A)
- For the inch system:
  - m = 10.68142† (D - t)t lb/ft (B)
- Where:
  - D = specified outside diameter
  - t = specified thickness
- This coefficient takes into account a density equal to 7.85 kg/cm².
- This coefficient takes into account a density equal to 489.8 lb/ft².
- The lb/ft value is then converted to kg/m by multiplying by 1.4882.
- The mean value in kg/m is {(A) + (C)}/2 and is rounded to three significant figures.
- The equivalent mean value in lb/ft is found by dividing the rounded value by 1.4882 and is then rounded to three significant figures.

# Tubes and Sockets

##### 1. Manufacture

- This Indian Standard was adopted by the Indian Standards Institution on 30 November 1982, after the draft finalized by the Steel Tubes, Pipes, and Fittings Sectional Committee had been approved by the Structural and Metals Division Council.
- This Indian Standard has been prepared to meet the requirements of lancing pipes used by the steel industry.
- Requirements for ceramic and other special coatings to enhance the life of the pipes will be added in due course after collecting the necessary data.
- This standard contains clauses 2.4, 11.1, and 12.1 which call for agreement between the purchaser and the manufacturer.
- For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS: 2-1960. The number of significant places retained in the rounded-off value should be the same as that of the specified value in this standard.

##### 2. Scope

- This standard covers the requirements of butt-welded, screwed and socketed, and plain end mild steel pipes intended for use in oxygen lancing.

##### 3. Terminology

- For the purpose of this standard, the following definitions shall apply.
- Black Pipe: Pipe as manufactured, but without any subsequent surface treatment.
- Length of Screwed and Socket Pipe: The length of the pipe inclusive of the socket.
- Nominal Bore: A size reference denoting the approximate bore of the pipe. For each size of pipe, the outside diameter is fixed by the corresponding screw thread dimensions of IS: 554-1975 and therefore, the actual bore of each size of pipe will vary according to the thickness.
- Random Length: Normal manufacturing lengths which may vary over a range of several meters. Alternatively, a length range agreed to between the purchaser and the manufacturer.
- Socket: The screwed coupling utilized in joining the pipes together.
- Pipe (Tube): A long, hollow, open-ended object of circular or other cross-section. The term 'pipe' is synonymous with the term 'tube'.
  - Note 1: The length of the pipe inclusive of the sockets means the pipe length measured with a socket fitted at one end to handling-tight.
  - Note 2: Handling tight means that the socket is so tight fitting that it should not fall down during handling or transit.
  - Note 3: The term 'socket' is synonymous with the term 'coupler'.

##### 4. Designation

- Mild steel pipes covered by this standard shall be designated by their nominal bore and shall be further classified as 'light', 'medium', and 'heavy' depending on the wall thickness.
- Mild steel sockets shall be designated by the respective nominal bore of the pipe for which it is intended.

##### 5. Supply of Materials

- General requirements relating to the supply of mild steel pipes and sockets shall conform to IS: 1387-1967.
- Lancing pipes shall be supplied with any of the following combinations as specified by the customer:
  - Plain end
  - Both ends screwed and one end socket

##### 6. Manufacture

- Pipes shall be manufactured from mild steel made by open hearth, electric, or any of the oxygen processes.
- Steel pipes and sockets shall be manufactured by one of the following processes:
  - Continuous oxy-acetylene gas welded pipes (OAW)
  - Electric resistance welded (ERW)
  - High frequency induction welded (HFIW)
  - Hot-finished welded (HFW)
- Pipes made by manual welding are not covered by this specification.
- Hand welding of sockets may be permitted provided the test requirements for the sockets covered by the standard are complied with.
- Sockets may also be manufactured from rods provided the test requirements for the sockets covered by the standard are complied with.
- Note: The Socket Length shown in Table meets the requirements of ISO 50, but the minimum length B has been increased to allow for the chamfer at the ends of the sockets and is based on B = 2L + 3.5P.

##### 7. Dimensions

- The dimensions of pipes shall be in accordance with Table 1, 2, and 3 subject to the tolerances permitted in 8. Dimensions of sockets shall be in accordance with Table 4.

##### 8. Mass

- Nominal masses of 'light', 'medium', and 'heavy' black pipes shall be as specified in Table 1, 2, and 3 respectively.

##### Tubes and Sockets

###### 1. Manufacture

- Manufacture of the steel: The steel shall be produced by the electric or one of the basic oxygen processes and shall be fully killed, semi-killed, or rimmed.
- Manufacture of the product: Tubes shall be manufactured by a welded process. Sockets shall be manufactured by a seamless or welded process.
- Chemical composition: The chemical composition of the steel shall comply with Table 1.
- Heat Treatment: Tubes shall be supplied in the annealed or normalized condition, the as-welded condition, the as-welded condition with the weld zone heat-treated, or after a hot finishing process.
- Note 1: Chemical analysis of the finished product is not required.
- Note 2: This steel is regarded as being weldable. However, care should be taken and welding should be carried out in accordance with the appropriate British Standards.

###### 2. Mechanical properties

- The mechanical properties at room temperature shall be as given in Table 1.

###### 3. Appearance and soundness

- Small imperfections which do not intrude on the minimum thickness or which can be dressed out such that the thickness after dressing remains within the tolerance limit shall be deemed not to affect compliance with this standard. Surface imperfections shall not be peeled.
- Screw threads shall comply with the requirements of BS 21.
- The ends shall be cut cleanly and normally square with the axis of the tube and be free from excessive burrs.
- The tubes shall be straight to within 1 in 500 as measured at the center of the length.
- The tubes shall not include welds used for joining lengths of strip.

###### 4. Joints

- All screwed tubes and sockets shall be threaded in accordance with BS 21 except as provided below and except that on light tubes the length of useful thread shall be reduced to 80% of that shown in column 12 of Table 2 of BS 21:1985.
- Where light tubes approach the lower limits of outside diameter, some 'black' threads (perfect at the root and imperfect at the crest) are to be expected beyond the gauge plane, but such 'black' threads shall be deemed not to affect the compliance of the tubes with this standard.
- Tubes shall be supplied screwed with taper threads and fitted with one screwed socket having a parallel thread unless it is specifically requested by the purchaser in his enquiry or order (see Appendix A) that the tubes shall be supplied without sockets or supplied with a socket having a taper thread.

###### 5. Dimensions and Tolerances

- Dimensions: The dimensions of tubes shall be as given in Table 3, 4, and 5. Dimensions of sockets shall be as given in Table 6.
- Tolerances: The tolerances on the outside diameter, thickness, mass, and length shall be as follows:
  - (a) Outside diameter

###### 6. Testing

###### A. Visual Inspection

Each tube shall be inspected to ensure compliance with Section 2.3. This visual inspection will ensure that the tubes meet the specified requirements for appearance, dimensions, and any visible defects.

###### B. Tensile Test

- The tensile test shall be conducted in accordance with BS 18: Part 4.
- The following parameters shall be determined: tensile strength (Rm), yield strength (Ro), and elongation (A).
- The results must comply with the requirements outlined in Table 1.
- For yield strength, either the upper yield stress (Ro) or the 0.5% proof stress (total elongation) A, 0.5 shall be determined.
- The percentage elongation shall be reported with reference to a gauge length of Lo=5.65 √So. If other gauge lengths are used, the corresponding percentage gauge length Lo=5.65 √So shall be obtained with reference to BS 3894: Part 1.
- In cases of dispute, a gauge length of Lo=5.65 √So shall be used.

###### C. Bend Test (Whole Tube)

- The bend test applies to tubes up to and including DN 50.
- Tubes shall withstand the test without showing any signs of fracture or failure.
- The test shall be carried out using a tube bending machine, with the tube bent round a grooved former of the radius as specified.
- The tubes shall be bent with the weld at 90° to the plane of bending. The tubes shall not be filled for this test.

- (a) Tubes which have not been hot-dip zinc coated shall be bent cold, without cracking, through 180° round a groove with a diameter equal to six times the outside diameter of the tube as given in Tables 3, 4, 5.
- (b) Hot-dip zinc coated tubes shall be bent cold without cracking through 90° round a former with a radius equal to eight times the outside diameter of the tube.

###### D. Flattening Test

- The flattening test applies to tubes greater than DN 50.
- A ring, not less than 40 mm in length, taken from one end of each selected tube, shall be flattened cold between parallel flat platens.
- The ring shall be flattened without showing either cracks or flaws until the distance between the platens is no greater than 75% of the original outside diameter of the tube.
- No cracks or flaws shall occur in the metal, except in the weld, until the substance between the platens is less than 60% of the original outside diameter.
- The weld shall be placed at 90° to the direction of flattening.
- Note: Slight premature cracking at the edges is not deemed to affect compliance with this standard.

###### E. Leak Tightness Test

- Black tubes shall be tested for leak tightness at the manufacturer's works.
- The test shall either be a hydraulic test at a pressure of 50 bars, with the pressure maintained sufficiently long for proof and inspection, or an eddy current test in accordance with Appendix B.
- Note: The choice of test is at the discretion of the manufacturer.

###### F. Bore Test (Hot-Dip Zinc Coated Tubes Only)

- The bore test shall be conducted to ensure compliance with the specified requirements.
- Hot-dip zinc coated tubes of DN 8 up to and including DN 25 shall have a rod, 230mm in length, of the appropriate diameter specified in the table, passed through them after hot-dip zinc coating to ensure a free bore.

###### 7. Manufacturer's Certificate

- The manufacturer shall provide a certificate certifying that the tubes supplied comply with this British Standard.
- Note: This certificate will only be provided when specified or requested by the customer in accordance with Appendix A.

# Dimensions & Nominal Masses of Black Steel Pipes (Light)

Normal Bore | Outside Diameter | Thickness | Mass of Black Pipe
--- | --- | --- | ---
Plain End | Screwed & Socketed
mm | MAX(mm) | MIN(mm) | mm | Kg/M | Kg/M
6 | 10.1 | 9.7 | 1.8 | 0.361 | 0.364
8 | 13.6 | 13.2 | 1.8 | 0.517 | 0.521
10 | 17.1 | 16.7 | 1.8 | 0.674 | 0.680
15 | 21.4 | 21.0 | 2.0 | 0.952 | 0.961
20 | 26.9 | 26.4 | 2.35 | 1.41 | 1.42
25 | 33.8 | 33.2 | 2.65 | 2.01 | 2.03

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