Minimum radius treated = 1.5 × Outside Diameter. The bent area can be subject to stress relieving heat treatment by joule effect in inert atmosphere. “U” Bent tubes in accordance with the standards detailed in table 1, part A can be requested. “U” bent tubes for heat exchanger can be supplied in accordance with the following norms and steel grades :
Its just a name change to reflect a need to adjust calculations - its not a name change that required any different fabrication methods.Heat exchanger Tube | Pipe and Tube Bender | U Tube heat exchanger | U bend Stainless Steel Tube | ASTM A556M | “U” Bent Cold Drawn Stainless Steel Tube | Bend Testing | Bend Tubing Happens | Bending Stainless Steel | ASTM B163 Nickel Alloy U bend Tubes When you say that "the thickness of the TS shapes and the HSS shapes is not the same" - you should be saying "the thickness of rectangular tube sections fabricated some years ago varied in the + and - allowables, but now the rectangular shapes tend to be fabricated in the - zone only and AISC has adjusted the properties to give us a better measure of strength to reflect that."Ī fabricator could make a rectangular shape and call it EITHER a TS or an HSS and still meet the ASTM requirements. The shapes are both fabricated under the same ASTM - it is because of the TREND in fabbricating these things closer to the lower bound thickness that AISC felt that the phi factor was not adequately accounting for the allowed variation - so they created the HSS shape to deal with it. LPPE - I think if you read UcfSE's post you'll see that you really don't disagree with what is stated.The shapes are different in that the HSS properties are reduced to account for the ALLOWED variation in the thicknesses that were becoming a reality with current fabrication techniques.
0 kommentar(er)
