ASME B31.1 Power Piping by ASME


This energy Piping Code is one of many Sections of the yank Society of Mechanical Engineers Code for strain Piping, B31. This part is released as a separate rfile for comfort. criteria and requirements in particular included through reference into this Code are proven in desk 126.1. it's not thought of functional to consult a dated variation of every of the criteria and requirements during this Code. in its place, the dated version references are incorporated in an Addenda and may be revised every year. This Code prescribes necessities for the layout, fabrics, fabrication, erection, attempt, inspection, operation, and upkeep of piping platforms. Piping as utilized in this Code contains pipe, flanges, bolting, gaskets, valves, pressure-relieving valves/ units, fittings, and the pressure-containing parts of different piping elements, no matter if synthetic based on criteria indexed in desk 126.1 or particularly designed. it's also hangers and helps and different apparatus goods essential to hinder overstressing the pressure-containing parts. principles governing piping for miscellaneous appurtenances, corresponding to water columns, distant water point symptoms, strain gages, gage glasses, etc., are incorporated in the scope of this Code, however the specifications for boiler appurtenances will be according to part I of the ASME Boiler and strain Vessel Code, PG-60. The clients of this Code are recommended that during a few parts laws could determine governmental jurisdiction over the subject material lined via this Code. although, this sort of felony requirement shall no longer relieve the landlord of his inspection tasks laid out in para. 136.1.

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Extra info for ASME B31.1 Power Piping

Sample text

Further, the sustained stresses calculated in this Code are “effective” stresses and are generally lower than those predicted by theory or measured in strain-gage tests. displacement stress: a stress developed by the selfconstraint of the structure. It must satisfy an imposed strain pattern rather than being in equilibrium with an external load. The basic characteristic of a displacement stress is that it is self-limiting. Local yielding and minor distortions can satisfy the displacement or expansion conditions that cause the stress to occur.

7, excluding para. 3 but including the consideration of allowances permitted by paras. 4. 2) External Pressure Stress. Piping subject to external pressure shall be considered safe when the wall thickness and means of stiffening meet the requirements of para. 3. 3) Longitudinal Stress. The sum of the longitudinal stresses, SL, due to pressure, weight, and other sustained loads shall not exceed the basic material allowable stress in the hot condition, Sh. 4 Ratings: Allowance for Variation From Normal Operation.

During pressure tests performed in accordance with para. 2% offset) at test temperature. In addition, the sum of longitudinal stresses due to test pressure and live and dead loads at the time of test, excluding occasional loads, shall not exceed 90% of the yield strength at test temperature. In determining the basic material allowable stresses, Sc and Sh, for welded pipe, the joint efficiency factor, E, need not be applied (see para. 3). The values of the allowable stresses from Mandatory Appendix A may be divided by the joint efficiency factor given for that material.

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