ASME SECTION I-2008 pdf download.RULES FOR CONSTRUCTION OF POWER BOILERS.
ASME has established procedures to authorize qualified organizations to perform various activities in accordance with the requirements of the ASME Boiler and Pressure Vessel Code. Itis the aimofthe Society to provide recogni- tion of organizations so authorized. An organization hold- ing authorization to perform various activities in accordance with the requirements of the Code may state this capability in its advertising literature. Organizations that are authorized to use Code Symbols for marking items or constructions that have been con- structedandinspectedincompliancewiththeASMEBoiler and Pressure Vessel Code are issued Certificates ofAutho- rization. Itis the aim ofthe Society to maintain the standing of the Code Symbols for the benefit of the users, the enforcement jurisdictions, and the holders of the symbols who comply with all requirements. Based on these objectives, the following policy has been established on the usage in advertising of facsimiles of the symbols, Certificates of Authorization, and reference to Code construction. The American Society of Mechanical Engineers does not “approve,” “certify,” “rate,” or “endorse” any item, construction, oractivity and there shall be no statements or implications that might so indicate. An organization holding aCode Symbol and/oraCertificate of Authorization may state in advertising literature that items, constructions, or activities “are built (produced or per- formed) or activities conducted in accordance with the requirements of the ASME Boiler and Pressure Vessel Code,” or “meet the requirements ofthe ASME Boiler and Pressure Vessel Code.” The ASME Symbol shall be used only for stamping and nameplates as specifically provided in the Code. However, facsimiles may be used for the purpose of fostering the use ofsuch construction. Such usage may be by an associa- tion or a society, or by a holder of a Code Symbol who may also use the facsimile in advertising to show that clearly specifieditems will carry the symbol. General usage is permitted only when all of a manufacturer’s items are constructed under the rules. The ASME logo, which is the cloverleaf with the letters ASME within, shall not be used by any organization other than ASME.
PG-1 SCOPE The requirements of Part PG apply to power boilers and high pressure, high-temperature water boilers and to parts and appurtenances thereto and shall be used in conjunction with the specific requirements in the applicable Parts ofthis Section that pertain to the methods of construction used. PG-2 SERVICE LIMITATIONS PG-2.1 The rules of this Section are applicable to the following services: (a) boilers in which steam or other vapor is generated atapressure ofmore than 15 psig (100 kPa) foruse external to itself (b) high-temperature water boilers intended for opera- tion at pressures exceeding 160 psig (1.1 MPa) and/or temperatures exceeding 250°F (120°C) PG-2.2 For services below those specified in PG-2.1 it is intended that rules of Section IV apply; however, boilers for such services may be constructed and stamped in accordance with this Section provided all applicable requirements are met. PG-2.3 Coil-type hotwater boilers where the water can flash into steam when released directly to the atmosphere through amanually operated nozzle may be exempted from the rules of this Section provided the following conditions are met: (a) There is no drum, header, or other steam space. (b) No steam is generated within the coil. (c) Tubing outside diameter does not exceed 1 in. (25 mm). (d) Pipe size does not exceed NPS 3 ⁄ 4 (DN 20). (e) Nominal watercapacitydoes notexceed6 gal(23 L). (f) Water temperature does not exceed 350°F (175°C). (g) Adequate safety relief valves and controls are pro- vided.
PG-4 UNITS Either U.S. Customary, SI, or any local customary units may be used to demonstrate compliance with all require- ments of this edition (e.g., materials, design, fabrication, examination, inspection, testing, certification, and over- pressure protection). In general, it is expected that a single system of units shall be used forall aspects ofdesign exceptwhere unfeasi- ble or impractical. When components are manufactured at differentlocations wherelocalcustomaryunits aredifferent than those used for the general design, the local units may be used for the design and documentation of that component. Similarly, for proprietary components or those uniquely associated with a system of units different than that used for the general design, the alternate units may be used for the design and documentation of that component. For any single equation, all variables shall be expressed in a single system of units. When separate equations are provided for U.S. Customary and SI units, those equations must be executed using variables in the units associated with the specific equation. Data expressed in other units shall be converted to U.S. Customary or SI units for use in these equations. The result obtained from execution of these equations may be converted to other units.