ASME SA-557-SA-557M:2021 pdf download

ASME SA-557-SA-557M:2021 pdf download.SPECIFICATION FOR ELECTRIC-RESISTANCE- WELDED CARBON STEEL FEEDWATER HEATER TUBES
1. Scope
1.1 This specification covers minimum-wall-thickness, electric-resistance-welded, carbon steel tubes including thosebent, ifspecified, into theformofU-tubes forapplica- tion in tubular feedwater heaters. 1.2 The tubing sizes covered shall be 1 ⁄ 8 to 1 1 ⁄ 4 in. [15.9 to 31.8 mm] outside diameter, inclusive, and wall thicknesses equal to or greater than 0.045 in. [1.1 mm]. 1.3 Optional supplementary requirements are provided and, when desired, shall be stated in the order. 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each systemmustbeusedindependentlyoftheother. Combining values fromthe two systems may resultin nonconformance with the specification. The inch-pound units shall apply unless the “M” designation ofthis specification is specified in the order.
4. Ordering Information
4.1 Orders for material to this specification should include the following as required to describe the desired material adequately: 4.1.1 Quantity (feet, metres, or number of pieces). 4.1.2 Name of material (electric-resistance-welded steel tubing). 4.1.3 Dimensions (outside diameter and minimum wall thickness). 4.1.4 Length (specific or random). 4.1.5 Manufacture (hot rolled or cold drawn; cold- rolled strip may be used as an alternate to hot-rolled strip). 4.1.6 Grade (Section 7) Table 1. 4.1.7 Optional requirements — If order specifies bending, a drawing of the U-tubes shall accompany the order. Purchaser must specify if stress-relief anneal of the U-bends is required (Product analysis, Section 8). 4.1.8 Test Report required (see Certification Section of Specification A 450/A 450M). 4.1.9 Specification designation. 4.1.10 Special requirements and any supplementary requirements selected.5.2.2 If cold drawn, tubes shall be heated after the final cold-working operation to a temperature of at least 1200°F [640°C] to ensure ductility satisfactory for rolling into tube sheets and to meet the specified mechanical prop- erties. 5.2.3 If heat treatment of the U-bends is specified, such heat treatment shall consist of heating the stressed portionwithin arange from1100 to 1200°F[590 to 640°C].
6. Surface Condition
6.1 Finished tubes shall be free of scale but may have a superficial oxide film on the surfaces. A light-oxide scale on the outside and inside surfaces of U-bend shall be allowed for tubes which have been heat treated for relief of stress. 6.2 Finished tubes shall be coated on both outside and inside diameter with a thin paraffin oil to prevent corrosion in transit. Other types of coatings may be applied as mutu- ally agreed upon and specified in the order.
8. Product Analysis
8.1 When requested in the purchase order, a product analysis shall be made by the supplier from one tube or coil of steel per heat. 8.2 If the original test for product analysis fails, retests of two additional lengths of flat-rolled stock or tubes, shall be made. Both retests, for the elements in question shall meet the requirements of this specification; otherwise all remaining material in the heat shall be rejected or, at the option of the producer, each length of flat-rolled stock or tube may be individually tested for acceptance. Lengths of flat-rolled stock or tubes which do not meet the require- ments of this specification shall be rejected. 8.3 For referee purposes, Methods E 30 shall be used.
10. Permissible Variations in Dimensions
10.1 Permissible variations from the specified outside diametershallbeinaccordancewiththeapplicable portions ofSpecification A 450/A 450M. The height offlash on the inside ofhot-rolled tubes shall be as specified in Specifica- tion A 450/A 450M. Cold-drawn tubes shall have no dimensional indication of welding flash. Tolerances for diameterandwall thickness do notapply to the bentportion of U-tubes. At the bent portion of a U-tube, for R p 2 ? D, neither the major nor minor diameter of the tube shall deviate from nominal by more than 10%.