Pipe Stress Engineering by Liang-Chuan Peng

By Liang-Chuan Peng

An updated and functional reference ebook on piping engineering and rigidity research, this publication emphasizes 3 major strategies: utilizing engineering logic to foresee a possible piping tension challenge, acting the strain research to substantiate the matter, and finally, optimizing the layout to resolve the matter. Systematically, the publication proceeds from uncomplicated piping flexibility analyses, spring hanger decisions, and growth joint purposes, to vibration tension reviews and normal dynamic analyses. Emphasis is put on the interface with connecting gear akin to vessels, tanks, warmers, generators, pumps and compressors. Chapters facing discontinuity stresses, detailed thermal difficulties and cross-country pipelines also are incorporated. The booklet is perfect for piping engineers, piping designers, plant engineers, and mechanical engineers operating within the energy, petroleum refining, chemical, nutrients processing, and pharmaceutical industries. it is going to additionally function a reference for engineers operating in development and transportation companies. it may be used as an boost textual content for graduate scholars in those fields.

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However, for other directional restraints, the rigid assumption may result in inaccurate, and sometimes meaningless, analyses. This is more so in the case of large pipes. Because there are few structural members that are stiffer than a 12-in. pipe, the restraint stiffness of pipes larger than 12 in. in size has to be investigated on a case-by-case basis. 9 Small Piping Piping systems with pipes 2 in. or smaller are generally field routed. They are shown only schematically on the construction drawings to give directional routing and to offer guidance for material takeoff.

Unless specified otherwise, only two directions of horizontal forces are analyzed. The vertical force, which can be significant, is not analyzed. This is somewhat justified because the piping has to be supported vertically for its weight in the first place. Past experience has also indicated that an earthquake can shake in all three directions randomly at the same time. Therefore, each direction of the force is analyzed independently, and the results are combined by the square root of the sum of squares (SRSS) method to arrive at the combined seismic effect.

Curve B is re-plotted in Fig. 5. The region above the curve does not require impact testing other than that required by the material specification. The figure shows that the higher the wall thickness, the higher the temperature under which the impact testing is required. This thickness correlation is mainly because a thicker wall creates a higher uneven stress distribution and higher probability of containing bigger size defects. Impact testing, as stipulated by the code, indicates using the full allowable stress as given in the allowable stress table.

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