ASTM-B88:2020 pdf free download – Standard Specification for Seamless Copper Water Tube.
11.1.2.2 The tube shall stand an internal air pressure of 6() psig for 5 s without showing evidence of leakage. The lest method used shall permit easy visual detection of any leakage, such as by having the tube under water or by the pressure diflerernial method.
12. Dimensions. Mass, and Permissible Variation
12.1 For the purpose of determining conformance with the dimensional requirements prescribed in this specification, any measured value outside the specilIed limiting values for any dimension shall make the tube subject to rejection at the option of the purchaser.
1 2.2 Standard Dimensions, I Vail Thickness, and Diameter Tolerances—The standard dimensions, wall thickness, and diameter tolerances shall be in accordance with Table I.
12.3 Mass—For purposes of calculating weights. cross sections, antI so forth, the density of the copper shall be taken as 0.323 lb/in.3 The theoretical weight per foot is given in Table
12.4 Roundness—For drawn unannealed tube in straight lengths. the roundness tolerance shall he as prescribed in Table 4. The deviation from roundness is measured as the difference between major and minor diameters as determined at any OflC cross section of the tube. No roundness tolerance has been established for annealed tube in straight lengths or for tubes furnished in coils.
12.5 Lengths and Tolerances:
12.5. 1 Standard Len gilis and Tolerances—The standard lengths and tolerances shall be as specified in Table 5.
12.5.2 Tube supplied in other than standard lengths and tolerances shall be in accordance with requirements established by agreement between the manufacturer or supplier and the purchaser.
15.1.1.2 When samples are taken at the time the castings are poured. at least one sample shall be taken for each group of castings poured simultaneously from the same source of molten metal.
1 5.1.1.3 When samples are taken from the semi-finished product. a sample shall be taken to represent each I 0 (XX) lb or traction thereof, except that not more than one sample shall be required per piece.
15.1.2 Mechanical Tests—For the mechanical tests, a spec imen shall be taken from each of the sample pieces selected in accordance with 14.1. The required mechanical lest shall be made on each of the specimens so selected. The value for the Rockwell hardness number of each specimen shall be established by taking the arithmetical average of at least three readings.
15.1.3 Microscopical Lxa,m,iation—One specimen shall he examined from each of the sample pieces selected in accordance with 14.1.
15.1.3.1 In the case of tube furnished in coils, a length sutTicient for all necessary tests shall be cut from each coil selected for the purpose of tests. The remaining portion of these coils shall be included in the shipment. and the permissible variations in length of such coils shall be waived.
15.2 Retests:
15.2.1 If any test specimen shows defective machining or develops flaws. it shall he discarded and another specimen substituted.