IS 10577

-- The following manufacturing tolerances shall be permitted on the pipes and sockets:
    1. Thickness:
          Light pipes: ± Not limited 8%
          Medium and Heavy pipes: ± Not limited 10%
    2. Masses:
          (No limit on + side)
          Light pipes: ± Not limited 8 percent
          Medium and heavy pipes: ± Not limited 10%
          For quantities per load of 10 tons, Min. (Light series): 5%
          For quantities per load of 10 tons, Min. (Medium & Heavy series): 7.5%
   * Note: For the purpose of weighting lots of 10 tons or more, the material may be divided into convenient sub-lots and weighted separately. Finally the tolerance may be applied to the total weight of lot.




-- All screwed tubes and sockets shall be supplied with pipe threads conforming to IS: 554-1975. Gauging practice shall be in accordance with IS: 8999-1979.
-- Unless specified otherwise, pipes shall be supplied screwed with taper threads and sockets with parallel threads.
-- However, in the case of 'light' tubes, the application of taper pipe threads may be modified by permitting the outside diameter of the pipes to be within the limits shown in column 2 and 3 of Table 1. Where the pipe approaches the lower limit of outside diameter, some incomplete threads (perfect at root and imperfect at the crest) may be expected from and beyond the gauge plane. Such incomplete threads shall not be regarded as justification for rejection of the pipes. Also the minimum length of threads in 'light' pipes shall be 80% of that specified in IS: 554-1975.
-- Each pipe shall be supplied with one socket and one plastic protective ring. The ends of sockets shall be chamfered internally to prevent damage to the leading thread. Tapping of sockets shall be done from one end only.



-- Random Length: The pipes shall be supplied in random lengths from 4 to 8 meters, unless otherwise agreed to between the manufacturer and the customer.



-- The pipes shall be supplied in random lengths from 4 to 8 meters, unless otherwise agreed to between the manufacturer and the purchaser.
-- Pipes shall withstand a test Pressure of 5 MPa (see NOTE) without showing defects of any kind. The pressure shall be applied by approved means and maintained sufficiently long for proof and inspection. The testing apparatus shall be fitted with an accurate pressure indicator, and provision shall be made for its accuracy to be verified by the purchaser, if required.
  * Note: 1 MPa= 0.102 kgf/sq.mm or 10.2 kgf/ sq.cm



The following tests shall be conducted by the manufacturer on finished pipes and sockets:
-- The tensile strength of length, cut from selected pipes when tested in accordance with IS: 1894-1972 shall be at least 320 MPa or 320 N/sq.m.
-- The elongation percentage on a gauge length of 5.65√So. (where So is the original cross-sectional area of the test specimen) shall be not less than 12%.
Bend Test on Pipes: When tested in accordance with IS: 2329-1963, the finished pipes shall be capable of withstanding the bend test without showing any signs of fracture or failure. The pipes shall be bent with the weld at 90° to the plane of bending. The pipes shall not be filled for this test.
Expansion Test on Sockets: At the option of the manufacturer any one of the tests described in below:
1. Drift Expanding Test: It shall be carried out on sockets, blacks for sockets in accordance with IS: 2335-1963 on a conical mandrel having an include taper on diameter 1 in 16 and the minimum increase in outside diameter after expansion shall be 2%.
2. Taper Screw Plug Test: Sockets shall be capable of withstanding the expansion test as described below without showing any sign of fracture or failure:
-- The test shall consist of screwing the selected socket on a taper screw plug.
-- The threads of the socket shall be thoroughly clean and free from foreign matter. Should the threads show sign of burr, this shall be removed by rotating the socket with both hands. The socket shall then be further rotated five complete turns beyond hand tightness, either by means of a pipe wrench of an adequate length to operate the test with gradual turning or by a power machine giving an appropriate leverage. The wrench shall not be hammered.
-- The Plugs shall be manufactured from steel and shall be hardened to give a Vickers hardness between 700 and 800 HV when determined by applying a load of 30kgf in accordance with IS :1501-1968..
-- The plugs shall be in accordance with the dimensions given in Table 5. The thread shall be ground after the plugs are case hardened, and the thread form and angle of taper shall be in accordance with the appropriate dimensions and tolerances specified in IS: 554-1975.
-- For routine testing, use may be made, if so desired, of unhardened steel plugs in accordance with dimensions given in Table 5 and having 1975.
-- In cases of dispute, however, the test shall be carried out with the hardened plugs specified above.



-- The pipes shall be cleanly finished and reasonably free from scale.They shall be reasonably straight, free from cracks, surface flaws, laminations and other defects.The screw threads of screwed pipes and sockets shall be clean and well cut. The ends shall be cut cleanly and square with the axis of the pipe.



-- Lot: For the purpose of drawing samples, all lancing pipes bearing the same designation and weight classification and also manufactured under a single process shall be grouped together to constitute a lot. Each lot shall be sampled separately and assessed for conformity to this specification.
-- Sampling and Criterion for Conformity: Unless otherwise agreed to between the manufacturer and the customer the procedure for sampling of pipes for various tests and criteria for conformity shall be as given in IS: 4711-1974.



-- Each pipe or each bundle of pipes shall carry legibly the manufacturer's name or trade-mark.
-- The different classes of pipes shall be distinguished by color bands which shall be applied as follows before the pipes leave the manufacturer's works:
    * 'Light' pipes: Yellow
    * 'Medium' pipes: Blue
    * 'Heavy' pipes: Red
-- The pipes or each bundle of pipes may also be marked with the ISI Certification Mark.
    * Note: The use of the ISI Certification Mark is governed by the provision of the Indian Standards Institution (Certification Marks) Act and the Rules and Regulations made by the founder. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by ISI and operated by the producer. ISI marked products are also continuously checked by ISI for conformity to that standard as a further safeguard. Details of conditions under which a license for the use of the ISI Certification Mark may be granted to manufactures or processors, may be obtained from the Indian Standards Institution.