ASME PTB-3-2010 pdf download

ASME PTB-3-2010 pdf download.Section VIII – Division 2 Example Problem Manual.
1.1 Introduction ASME B&PV Code, Section VIII, Division 2 contains mandatory requirements, specific prohibitions, and non-mandatory guidance for the design, materials, fabrication, examination, inspection, testing, and certification of pressure vessels and their associated pressure relief devices. The 2007 edition of the code has been re-written and reorganized, and incorporates the latest technologies for pressure vessel design. 1.2 Scope Example problems illustrating the use of the design-by-rule and design-by-analysis methods in ASME B&PV Code, Section VIII, Division 2 are provided in this document. Example problems are provided for all calculation procedures in both SI and US Customary units. 1.3 Organization and Use An introduction to the example problems in this document is described in Part 2 of this document. The remaining Parts of this document contain the example problems. The Parts 3, 4, and 5 in this document coincide with the Parts 3, 4 and 5 in the ASME B&PV Code, Section VIII, Division 2. For example, example problems illustrating the design-by-rule calculations contained in Part 4 of Section VIII, Division 2 are provided in Part 4 of this document. All paragraph references are to the ASME B&PV Code, Section VIII, Division 2 2007 with the 2009 Addenda [1]. The example problems in this manual follow the calculation procedures in ASME B&PV Code, Section VIII, Division 2. It is recommended that users of this manual obtain a copy of ASME PTB-1- 2009 [2] that contains criteria and commentary on the use of the design rules. It should be noted that VIII-2 permits the use of API 579-1/ASME FFS-1 [3] for some calculation procedures. When reviewing certain example problems in this manual, it is recommended that users obtain a copy of this standard.
Per paragraph 3.11.2.3 for Carbon and Low Alloy Steel Except Bolting. a) Since the vessel has been PWHT, Figure 3.8 (or Table 3.15) shall be used to establish impact testing exemptions based on the impact test exemption curve for the subject material specification, MDMT, and governing thickness of a welded part. b) As noted in Figure 3.8, from the Material Assignment Table, a material specification of 516 70 SA N − − is designated a Curve D material. c) The governing thickness g t of a welded part is determined from the criteria of paragraph 3.11.2.3.b. For a butt joint in a cylindrical shell, g t is equal to the nominal thickness of the thickest weld joint, see Figure 3.9 Sketch (a). 1.8125 g t in = d) If an MDMT and thickness combination for the subject material is on or above the applicable impact test exemption curve, then impact testing is not required for base metal. Requirements for weld metal and heat affected zones are provided in paragraph 3.11.8. Interpreting the value of MDMT from Figure 3.8 is performed as follows. Enter the figure along the abscissa with a nominal governing thickness of 1.8125 g t in = and project upward until an intersection with the Curve D material is achieved. Project this point left to the ordinate and interpret the MDMT.
b) STEP 2 – Determine the applicable material toughness curve to be used. Since the vessel has been PWHT, Figure 3.8 (or Table 3.15) shall be used to establish impact testing exemptions based on the impact test exemption curve for the subject material specification, MDMT, and governing thickness of a welded part. As noted in Figure 3.8, from the Material Assignment Table, a material specification of 516 70 SA N − − is designated a Curve D material.
In accordance with paragraph 3.11.2.8, evaluate an assessment temperature of 20 F − ° using a fracture mechanics methodology. NOTE – for a typical fitness-for-service assessment involving crack-like flaws, the component under consideration shall be evaluated in its current state, where future corrosion allowance is not considered.