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ASME SECTION X-2008 pdf download

The American Society ofMechanical Engineers set up a committee in 1911 for the purpose offormulating standard rules for the construction of steam boilers and other pres- sure vessels. This committee is now called the Boiler and Pressure Vessel Committee. The Committee’s function is to establish rules of safety, relating only to pressure integrity, governing the construc- tion 1 of boilers, pressure vessels, transport tanks and nuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to interpret these rules when questions arise regarding their intent. This code does not address other safety issues relat- ing to theconstructionofboilers, pressurevessels, transport tanks and nuclearcomponents, and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, laws, regulations, or other relevant documents. With few exceptions, the rules do not, of practical necessity, reflect the likelihood and consequences ofdeterioration in service related to specific service fluids or external operating envi- ronments. Recognizing this, the Committee has approved a wide variety ofconstruction rules in this Section to allow the user or his designee to select those which will provide a pressure vessel having a margin for deterioration in ser- vice so as to give a reasonably long, safe period of use- fulness. Accordingly, it is not intended that this Section beusedas adesignhandbook; rather, engineering judgment must be employed in the selection of those sets of Code rules suitable to any specific service or need. This Code contains mandatory requirements, specific prohibitions, and nonmandatory guidance for construction activities. The Code does not address all aspects of these activities and those aspects which are not specifically addressed should not be considered prohibited. The Code is not a handbook and cannot replace education, experi- ence, and the use of engineering judgment. The phrase engineering judgment refers to technical judgments made by knowledgeable designers experienced in the application of the Code. Engineering judgments must be consistent with Code philosophy and such judgments must never be used to overrule mandatory requirements or specific prohibitions of the Code. 1 Construction, as used in this Foreword, is an all-inclusive term com- prising materials, design, fabrication, examination, inspection, testing, certification, and pressure relief. ix The Committee recognizes that tools and techniques used for design and analysis change as technology prog- resses and expects engineers to use good judgment in the application of these tools. The designer is responsible for complying with Code rules and demonstrating compliance with Code equations when such equations are mandatory. The Code neither requires nor prohibits the use ofcomput- ers for the design or analysis of components constructed to the requirements of the Code. However, designers and engineers using computer programs for design or analysis are cautioned that they are responsible for all technical assumptions inherent in the programs they use and they are responsible for the application of these programs to their design. The Code does not fully address tolerances. When dimensions, sizes, or other parameters are not specified with tolerances, the values of these parameters are consid- ered nominal and allowable tolerances or local variances may be considered acceptable when based on engineering judgment and standard practices as determined by the designer. The Boiler and Pressure Vessel Committee deals with the care and inspection of boilers and pressure vessels in service only to the extent of providing suggested rules of good practice as an aid to owners and their inspectors. The rules established by the Committee are not to be interpreted as approving, recommending, or endorsing any proprietary or specific design or as limiting in any way the manufacturer’s freedom to choose any method of design orany formofconstruction thatconforms to the Coderules. The Boiler and Pressure Vessel Committee meets regu- larly to considerrevisions ofthe rules, new rules as dictated by technological development, Code Cases, and requests for interpretations. Only the Boiler and Pressure Vessel Committee has the authority to provide official interpreta- tions ofthis Code. Requests for revisions, new rules, Code Cases, or interpretations shall be addressed to the Secretary in writing and shall give full particulars in order to receive consideration and action (see Mandatory Appendix cov- ering preparation of technical inquiries). Proposed revi- sions to the Code resulting from inquiries will be presented to the Main Committee for appropriate action. The action of the Main Committee becomes effective only after con- firmation by letter ballot of the Committee and approval by ASME.

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