Sp3d piping tutorial free download1/3/2023 Sustained stress calculation is specific in B 31.1 but undefined for B 31.3.B 31.3 neglects torsion while calculating sustained stresses, but B 31.1 includes it.Stress increases due to occasional loads are different in each code.Material allowable stresses are different in both codes.Hand-lever, hand-wheel, chain operator, gear operator etc.Īmerican Society for Mechanical Engineers.ġ7. Which Piping code is used for Power piping and which code is used for Process Piping design?ġ8. What are the main differences between ASME B 31.1 and ASME B 31.3? Shell-hydrostatic, seat-hydrostatic, seat-pneumatic Valve in which the closing operation of valve is achieved by 90 degrees turn of the closing element.ġ4. What pressure tests are carried out on valves? This term is used to indicate the premature erosion of the valve seat caused by excessive velocity between seat and seat disc, when valve is not closed tightly. Trim is composed of stem, seat surfaces, back seat bushing and other small internal parts that normally contact the surface fluid.ġ0. Which standard specifies trim numbers for valve?Īll parts that come in contact with surface fluid are called wetted parts. Multi-port, flush bottom, float, foot, pressure relief, breather.Ĩ. What materials are used for construction of valves?Ĭast iron, bronze, gun metal, carbon steel, stainless steel, alloy carbon steel, polypropylene and other plastics, special alloys. Globe, needle, butterfly, diaphragm, piston, pinch. Gate, ball, plug, piston, diaphragm, butterfly, pinch. Isolation, regulation, non-return and special purposes. What to handle, liquid, gas or powder, fluid nature, function, construction material, disc type, stem type, how to operate, bonnet type, body ends, delivery time, cost, warranty. What are the steps in selection of valve? Must be located at the bottom section of drum.Ģ. PIPING Engineering Interview Questions :-ġ.
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