ASME PTB-4-2021 pdf download

ASME PTB-4-2021 pdf download.ASME Section VIII – Division 1 Example Problem Manual.
This document is the Division 1 Example Problem Manual. In this manual, example problems are solved using both the Division 1 and Division 2 rules. When the design rule is the same, the example problem is solved using the Division 2 rules with the Division 1 allowable stress and weld joint efficiency. With this approach, users of Division 1 will become familiar and adept at using Division 2, and this will also provide a significant training benefit to the Division 1 user in that Division 2 has been designed as the home for the common rules’ initiative being undertaken by the ASME Section VIII Committee. In 2007, ASME released a new version of the ASME B&PV Code, Section VIII, Division 2. This new version of Division 2 incorporated the latest technologies to enhance competitiveness and is structured in a way to make it more user-friendly for both users and the committees that maintain it. In addition to updating many of the design-by-analysis technologies, the design-by-rule technologies, many adopted from the Division 1 rules, were modernized. ASME has issued ASME Section VIII – Division 2 Criteria and Commentary, PTB-1-2009 that provides background and insight into design-by-analysis and design-by-rule technologies. The ASME Section VIII Committee is currently undertaking an effort to review and identify common rules contained in the Section VIII Division 1, Division 2, and Division 3 B&PV Codes. In this context, common rules are defined as those rules in the Section VIII, Division 1, Division 2, and Division 3 Codes that are identical and difficult to maintain because they are computationally or editorially complex, or they require frequent updating because of the introduction of new technologies. Common rules typically occur in the design-by-rule and design-by-analysis parts of the code; but also exist in material, fabrication, and examination requirements. A plan has been developed to coordinate common rules with the following objectives.
• Common rules in the Section VIII Division 1, 2, and 3 codes should be identical and updated at the same time to ensure consistency. • Common rules will be identified and published in a single document and referenced by other documents to; promote user-friendliness, minimize volunteer time on maintenance activities, and increase volunteer time for incorporation of new technologies to keep the Section VIII codes competitive and to facilitate publication. • Core rules for basic vessel design such as wall thickness for shells and formed heads, nozzle design, etc. will be maintained in Division 1; although different from Division 2 these rules are time-proven and should remain in Division1 because they provide sufficient design requirements for many vessels. • ASME Section VIII Committee recognizes that Division 2 is the most technically advanced and best organized for referencing from the other Divisions and recommends that, with the exception of overpressure protection requirements, common rules identified by the committee shall reside in Division 2 and be referenced from Division 1 and Division 3, as applicable. As a starting point for the common rules’ initiative, the ASME Section VIII Committee has developed Code Case 2695 to permit the use of some the design-by-rule procedures in Division 2 to be used for Division 1 construction. As part of the common rules’ initiative, the ASME Section VIII Committee is working with ASME LLC to create separate example problem manuals for each Division. These manuals will contain problem examples that illustrate the proper use of code rules in design. The ASME Section VIII – Division 2 Example Problem Manual, PTB-3 2009 has been completed and issued.
2.1 General Example problems are provided for; • Part 3 – Materials Requirements • Part 4 – Design by Rule Requirements parts in Section VIII, Division 1 • Part 5 – Design by Analysis • Part 6 – Fabrication Requirements • Part 7 – Examination Requirements • Part 8 – Pressure Testing Requirements A summary of the example problems provided is contained in Table E2.1 2.2 Example Problem Format In all of the example problems, with the exception of tubesheet design rules in paragraph 4.18, the code equations are shown with symbols and with substituted numerical values to fully illustrate the use of the code rules. Because of the complexity of the tubesheet rules, only the results for each step in the calculation producer is shown. If the design rules in VIII-1 are the same as those in VIII-2, the example problems are typically solved using the procedures given in VIII-2 because of the structured format of the rules, i.e., a step-by-step procedure is provided. When this is done, the paragraphs containing rules are shown for both VIII-1 and VIII-2.