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Asme pcc 1 2013 pdf free download
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It may not be acceptable to categorize by gasket type as extremely thin gaskets or gaskets without sufficient filler will not fill imperfections and therefore are categorized as hard-faced gaskets. Metal-faced gaskets, such as flat metal. Hard gaskets arc typically defined as gaskets that have less than 1. Generally speaking, it is not appropriate to classify gaskets as hard or soft based solely on physical hardness or softness of the gasket перейти на страницу Itself.
For example. See also hard-faced gaskets. Soft-faced gaskets have sufficient soft filler dowmload as graphite. It may not be acceptable to categorize by gasket type as extremely thin sheet gaskets or gaskets without sufficient filler or facing will not till Asme pcc 1 2013 pdf free download and therefore are categorized as hard-faced gaskets. See also soft 9askets. Soft gaskets are typically defined fere gaskets that have more than 1.
It is not appropriate to classify gaskets as hard or soft based solely on physical hardness or softness of the gasket material itself. For example, 1. See also soft-faced gaskets.
Document Information.Asme pcc 1 2013 pdf free download
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Is this content inappropriate? Report this Document. Flag for inappropriate content. Download now. Jump to Page. Search inside document. Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. Joint Pressure and Tightness Testing. The scope ofthis committee was to develop and maintain standards addressing common issues and technologies related to post-construction activities and to work with other consensus committees in the development of separate, product-specific codes and standards addressing issues encountered after initial construction for equipment and piping covered by Pressure Technology Codes and Standards.
The BPTCS covers non-nuclear boilers, pressure vessels including heat exchangers , piping and piping components, pipelines, and storage tanks. None of these documents are Codes. Leonard, Choir Peters, Vice chair 5. Brow, Inteaity Engineering Solutions. Lang, Ft Global BE. Roberts, Shell Global Solutions U. Taagepera, Chevron Energy Technology Co.
Oyamada, Delesate T tahar, Delegate C. Neely, Chae Becht Enginerng Co. Milne, stale Ud JR. Rodery, 8? North American roduts, In. By selection of those features suitable to the specific service or need, these guidelines may be used to develop effec tive joint assembly procedures forthe broad range of sizes and service conditions normally encountered in industry Users are cautioned that the guidelines contained in ASME PCC-1 have been developed generically and ate recommended for general applications.
They may not necessarily be suitable forall applications. Precautionary considerations are provided in some eases but should not be considered as all inclusive. Sound engineering practices and judgment should be used to determine the applicability of a specific method or part of a method toa specific application.
Each joint assembly procedure should be subject to an appropriate review by qualified personnel. Alternative features, and methods for specific applications may be used sub- ject to endorsement by the user. Before assembly is started, clean and examine flange and fastener contact surfaces as described inthis section.
Refer to Appendix D for guidelines covering recommended! Appendix D provides flatness tolerance recommendations. The process will remove thread material therefore, the user is cautioned to ensure the tolerance limits of ASME BL forthe original class off specified fare not exceeded. Any fastener with thread dimensions less than the minimum major diameter or the minimum pitch diameter should be replaced.
Coat- ings over approximately 0. Roughness, gouges, and pro- trusions should be removed from these surfaces. On severely damaged flanges, machining this area may be required, in which case the minimum acceptable esa flange thickness must be considered. It results in maximum, sealing surface contact, maximum opportunity for uni form and design-level gasket loading, and reduced fric- tion between the nut and the flange.
Guidelines for aligning flanged joints are provided in Appendix E. Flat washers also promote improved load distribution. See section 12 Target Torque Determination. Te root aeas are based on coatse-thread eels for sizes M27 and smaller, and 3-mm pitch thead series for szes M30 and larger. The bass for the torque values in Table 1M are cescbed inthe Notes below. The torques were adjusted based on industy experience and ver fed by bolt elongation measurements. Customary Units See section 12 for instructions on how to adjust torque values in this table.
TergetToraue, fb Nominal Sot size in. The rot area are based on coarse seis for sies 1 in. The Target Toraue values were computed Using nt factors selected fo achieve Target Prestass of 50 ks. Te torques were adjusted based on industy experience and veri by bal elongation measurements. Reuse of a gasket is not recommended, However, the substrates of grooved metal gaskets with facing layers may be reused after having been reconditioned and refaced in a manner consistent with the original product specification.
The reinstallation of gaskets so refurbished isnot considered gasket reuse since the sealing perform- ance of the gasket has been restored. For other gasket types, experience has clearly shown that only anew gasket will reliably provide the necessary plastic defor- mation and elastic recovery characteristics essential to achieve an effective seal. Visual oF physical inspection of a used gasket for apparent damage is not sufficient todetect such sealing surface factors as work-hardening, brittleness, or the effects of heat or interaction with the service fluid.
No portion of the gasket should project into the flow path, 6 Ensure that the gasket will remain in place during the joint assembly process; a very light dusting of spray adhesive on the gasket not the flange may be used.
Do not use tape sirps radially across the gasket to hold it in position. Do not use grease. Particular care should be taken to avoid kubricant chemistry that could contribute to stress corrosion crack- ing, galvanic corrosion, oxygen auto-ignition, et.
Lubrication should be applied irrespective of the tightening method used. When reusing, coated bolts or if lubricant is applied to new or reused coated bolts, the Nut Factor will change and therefore the torque values should be adjusted accordingly refer to Appendix K. If muts do not hand tighten, check for cause and make necessary corrections. This length should consider the presence of washers, nut height, and.
Galvanized or coated bolts may require special tensioner puller sleeves, 8. Excess thread protrusion beyond.
The sensitivity to this occurrence should be given careful attention along with other joint considerations when, selecting the level of Target Bole Stress. Numbering of Bolts When a Single Tool Is Used When either the Legacy or Modified Legacy methods are used, the corresponding bolt-numbering systems are 2s follows: a Asystem whereby each bolt location, starting with number 1 and continuing through N, is numbered sequentially on the flange ina clockwise manner where Nis the total number of bolts in the joint.
It has been retained. This numbering. For the purposes of joint assembly, the Table 4 and Table 4. See Appendix F for joint assembly patterns and torque-increment combinations that requite less assem- bly effort than the Table 4 Legacy and the Table 4. This is an acceptable and usually required prac- tice. Check Mange gap around circumference for uniformity. M the ap around the creumference isnot easonaby uniform, make the appropiate adjustments by selective liahtenngloosening before proceeding found 4 Connue tightening the bots, but ona cela clockwise pater unl na farther nut ration occurs atthe Round 3 Target Toraue value.
For ndcator Balt, tighten bolts unl the indeato og revaction readings for allbots are within the specified range, Round'5 Time pemitng, wait 2 minimum of 4 hr and repeat Round 4; this wil restore the shartterm creep relaxation? Alternatives 2 and 3 fromm Appenin Fuse both a diferent pattern than that in Table 4 of Table 4. Complance with the Unitains ofthe applic tion of these alternatives is essential 0 See Append or Alteratves 4 and 5 fr altemative group numbering and tightening sequence when simultaneously using mull tool, ore 2 See Figs.
Nore 2 The number asigned at each bot location represents the sequential order fr tightening the bol. This range is normally only exceeded in exceptional cases that have been assessed by a qualified engineer. However, any maximum Target Bolt Prestress must be selected to ensure that al three ofthe joint components —bolts, lange, and gasket — are stressed within acceptable limits.
See also para, O Appendix O outlines a method to determine the assembly bot stross for a given flange joint bot, flange, gasket assembly. The method is based on a formula and flange stress limits that are supported by and consistent with elastic-plastic FEA work.
A calculation is provided that uses an example-specific maximum allowable gas- ket stress; however, the user must provide this informa- tion.
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