By Wingate, James A
Folllowing the luck of his first booklet concerning Hydraulics, Pipe circulate, business HVAC & application platforms, Mister Mech Mentor now bargains an all-new, easy-to-read selection of chapters that includes ASME Piping & strain Vessel Code functions. Written in a pleasant sort, this e-book presents the fundamental advantages of guide by way of a private mentor who explains why and the way, whereas instructing in all likelihood risky classes in physics and engineering layout. Spared the embarrassment of painful blunders, either early-career and skilled engineers will achieve functional wisdom from frank, colourful instances and discover ways to remedy quite a few mechanical difficulties, together with: Pipe tension & pressure Structural helps strain Vessels Jacketed Pipes Bellows-Type enlargement Joints approach Piping
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Additional info for Applying the ASME codes : plant piping and pressure vessels
2 springs × 300 lb/in. = 126 lb, making the support force = 2 × 803 = 1,607 lb at Node 80. Also in the stress program printout with header Pipe Stress: Example No. ) This is not an excessive load for industrial plant pipe rack framing steel (LOAD CASE NO. 3, THL + WT). • At Node 50, the spring constant for Scheme #1 was 1,200 lb/in. (Grinnell Figure 82 Size 13 spring hanger), and for Scheme #2 the spring constant and Grinnell unit size (13) remain the same. However, in Scheme #1 the cold-set and (hot) operating loads are 2,509 and 2,416 pounds, respectively.
It would certainly not be cost-effective. In the stress program printout Pipe Stress:: Example No. 2:: page 6 of 9, we find this value of vertical fixed (rigid) support reaction force, pounds: ≅ 9,200 psi bending stress. vs. allowable material stress = 17,000 psi Just offhand, this stress level should not be a problem for the header pipe, although only a stress analysis which models all of the 16-in. header and all of its loads and support conditions will tell for sure. But for purposes of qualifying the 12-inch branch pipe stress wise, the restraint condition at Node 120 is certainly OK.
Of course, additional support structure would have to be made available above the new support point, adding to cost. • Use a constant effort spring instead of a variable spring hanger. At Node 50, a constant support would enable no practical improvement over a variable spring, but in conjunction with a Node 40 elbow trunnion as above, it might afford a very slight but negligible load reduction. It would certainly not be cost-effective. In the stress program printout Pipe Stress:: Example No. 2:: page 6 of 9, we find this value of vertical fixed (rigid) support reaction force, pounds: ≅ 9,200 psi bending stress.
Applying the ASME codes : plant piping and pressure vessels by Wingate, James A