ASME 2344-1 pdf download Case 2344-1 Use ofSand Cast Aluminum Alloy A356.0, T6 Temper, for the Manufacture of Hot Water Heating Boilers Under Part HC Section IV
Inquiry: May aluminum alloy A356.0 sand castings in the T6 temper meeting the chemical composition and mechanical properties given in Tables 1 and 2 and other requirements ofASTM B 26/B 26M-97 be used in Section IV, Part HC, construction of heating boilers? Reply: It is the opinion ofthe committee that aluminum alloy A356.0 sand castings in the T6 temper meeting the chemical composition and mechanical properties given in Tables 1 and 2 and other requirements of ASTM B 26/B 26M-97 may be used in Section IV, Part HC, construction of heating boilers, under the following conditions:
(a) No welding is permitted.
(b) In lieu of Section IV, HC-200 through HC-213, all applicable requirements of ASTM B 26/B 26M-97 and Tables 1 and 2 of this Case shall apply. The footnotes applicable to Tables 1 and 2 of ASTM B 26/B 26M-97 apply to Tables 1 and 2 of this Case.
(c) Maximum water temperature shall be 200°F (95°C).
(d) All other applicable parts of Section IV shall apply except except HC-401 and HC-402. In lieu of procedures of HC-410, the assembled boiler may be hydrostatically tested at 2 1 ⁄ 2 times the maximum allowable working pres- sure, provided the test pressure does not exceed 1 1 ⁄ 2 times the design pressure of the next limiting part. If 2 1 ⁄ 2 times hydro exceeds 1 1 ⁄ 2 times the design pressure of any part of the completed vessel, then the 2 1 ⁄ 2 times test is only per- formed on the casting, and the assembled boiler must be tested at 1 1 ⁄ 2
(e) Prooftesting to establish design pressure is required and shall comply with HG-501 and HG-502.3, except that in the equation in HG-502.3, the specified minimum tensile strength at room temperature shall be 34,000 psi (235 MPa)and the design factor shall be 7 in lieu of 5.
(f) All boiler parts or sections shall be built according to the Material Specification requirements. Each boiler section, including end and intermediate cored sections, shall show the following data cast in letters or numerals at least 5 ⁄ 16 in. (8 mm) high: (1) the Material Specification identification number (2) the boiler or parts manufacturer’s name or accept- able abbreviation, preceded by the words “Certified by” or “Cert. by”