Applying the ASME codes : plant piping and pressure vessels by Wingate, James A

By Wingate, James A

Folllowing the luck of his first booklet with regards to Hydraulics, Pipe move, commercial HVAC & application structures, Mister Mech Mentor now deals an all-new, easy-to-read number of chapters that includes ASME Piping & strain Vessel Code functions. Written in a pleasant kind, this booklet offers the basic advantages of guide by way of a private mentor who explains why and the way, whereas instructing most likely risky classes in physics and engineering layout. Spared the embarrassment of painful blunders, either early-career and skilled engineers will achieve useful wisdom from frank, colourful situations and learn how to clear up quite a few mechanical difficulties, together with: Pipe tension & pressure Structural helps strain Vessels Jacketed Pipes Bellows-Type enlargement Joints method Piping

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This can get very hairy, and so I left it out of our examples on purpose. (The examples’ pipe routing geometry are based on a large hydronic system which went into a microelectronics plant in Ireland, which is an earthquake zone zero site.

The pipe would rise off these supports, and the single remaining intermediate support at Node 80 would have to bear any sustained reaction not borne by Nodes 5 and 120. We see that the result would be: Moment ≅ 27,000 ft-lb. × 12 = 324,000 in-lb. Section Modulus S of 16-in. 0 for the as-built branch connection on the header pipe; 16-in. 3 code allowable. But the design itself is unacceptable, because if the support structure at Node 80 were to break, then the pipe would have no intermediate support whatever, and you should expect immediate gross failure of the whole piping system in that event.

There would be no redundancy, no failsafe. One cannot assume that the lifted-off Nodal points 50 and 100, bearing zero sustained load, would acceptably support the whole system if support Node 80 failed. Only an actual analysis of that condition, including the dynamic forces of the falling pipe, would tell for sure. 3 allowables would be exceeded, wouldn’t you? In any case, we cannot permit this situation to exist. org/about-asme/terms-of-use 22 • Chapter 3 So, what if we rigidly restrain the piping at Nodes 50, 80 and 100, both vertically up and vertically down?

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