ASME PCC-2-2006 pdf download

ASME PCC-2-2006 pdf download.Repair of Pressure Equipment and Piping.
1 SCOPE This Standard provides methods for repair of equip- ment and piping within the scope of ASME Pressure Technology Codes and Standards 1 after it has been placed in service. These repair methods include relevant design, fabrication, examination, and testing practices and may be temporary or permanent, depending on the circumstances. The methods provided in this Standard address the repair of components when repair is deemed necessary based on appropriate inspection and flaw assessment. These inspection and flaw evaluation methods are not covered in this document, but are covered in other post- construction codes and standards. Only technical procedures and information are pro- vided; administrative or policy requirements are outside of the scope of this Standard. 2 ORGANIZATION This Standard is divided into five Parts. (a) Part 1 covers the scope, organization, and intent and is applicable to all articles in this Standard. Table 1 provides guidance for the applicability of repair meth- ods listed in this Standard. (b) Part 2 covers repair methods and techniques that include the use of welding, brazing, soldering or other methods involving metal deposit. (c) Part 3 covers mechanical repairs, with or without sealant, such as bolted clamps or fixtures and includes all repair methods not covered in Part 2 or Part 4. (d) Part 4 covers repairs using nonmetallic means, such as nonmetallic liners and wraps, and bonding (e.g., joining by epoxy), including bonding of metallic compo- nents. 1 Equipment and piping within the scope of ASME Pressure Technology Codes and Standards includes piping (including pipe- lines) and piping components (such as valves), boilers, pressure vessels (including heat exchangers), and storage tanks. 1 (e) Part 5 covers examination and testing methods and techniques. 3 INTENT 3.1 This Standard provides technical information, proce- dures, and recommendations for repair methods that were determined by consensus to be recognized and generally accepted good engineering practice. Where equipment repair is subject to jurisdictional regulation, jurisdictional approvals may be required. 3.2 The words should, shall, and may are used in the repair articles of PCC-2 and they have the following intent: should: an action that is not mandatory. It indicates an action that when performed, is generally considered to be good practice; however, there are some circumstances when the action is not appropriate or required, so the word should is used to provide flexibility for the article to covera broad rangeofcircumstances. Itisnotmandatory unless so specified by others in the application of these articles. shall: an action that is mandatory. It indicates an action that is an essential element of the repair method that cannot be eliminated. may: indicates an action that is permitted, but not required.
3.4 Users of the articles contained in this document are cautioned thatthese articles have been developed gener- ically and are recommended for general applications. They may not necessarily be suitable for all applications. Precautionary considerations are provided, but should not be considered all inclusive. Sound engineering prac- tices and judgment should be used to determine the applicability of a specific method or part of a method to a specific application. Each repair should be subject to an appropriate review by qualified personnel, and this review should consider subsequent deterioration of the repaired component. Some limitations and considerations are contained in section 2 of the individual articles. 3.5 While this Standard covers repair ofequipmentwithin the scope ofASME Pressure TechnologyCodes and Stan- dards, itmaybe usedonequipmentconstructedinaccor- dance with other Codes and Standards. 3.6 Individual articles in this Standard may be used inde- pendently of other articles, except when otherwise noted. However, this Part (Part 1) applies to all articles in this Standard. 3.7 Many of the repair techniques included in this Stan- dard are considered to be permanent, intended to remain in place for the life of the repaired component. Others may only be suitable for short-term service, and should be replaced with a more permanent repair at the appro- priate opportunity. The anticipated life of the repair depends onmany circumstances, and could include con- sideration of risk. As such, this Standard does not clas- sify repair methods as permanent or temporary. Rather, technical considerations that affect the expected life of the repair are stated in the individual articles. 3 3.8 Reference to specific codes is generally avoided in this Standard because the equipment or piping could have been constructed in accordance with a number of differ- entcodes. Where such a reference is provided, itis gener- ally the intent to include, by reference, a specific technical provision. 3.9 Requirements for welding, including qualification of welding procedures, welders, and welding operators, should generally follow an applicable code of construc- tion or an applicable post-construction code, except when otherwise specified herein. 3.10 Calculations involving the allowable stress use the allowable stress from the original code ofconstruction or an applicable post-construction code, unless otherwise specified in specific articles. 3.11 When qualifications of examiners, methods of exami- nation, extent of examination, and acceptance criteria are not specified, they should follow the requirements of an applicable code of construction or an applicable post-construction code.