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Dear Sharik, If I remember well also somewhere in the ASME VIII Div.1 is the PWHT required <8for any thickness,even lower than 1.1/2") if the vessel/equipment is STEAM GENERATOR... may be UG......but I am not sure. please check..... I would check by myself and then I will let you know. Let me...

Dear all, has someone already herd about API 934-D?? has it already been draught and put on the market? please let me know. thanks in advance GENGI

Dear All, I am performing a design using ASME VIII Div.1 Code and I am keen to understand if the bolting material ASTM A 453 660 Gr. A & B comply with the NACE 0103 and 0175 requirements ( above all regarding the hardness limit). I have to design internal bolting in contact with H2S...

Dear SJones and Metengr, thanks a lot for your replies!! I would like to ask you some more things relating to your replies: 1) SJones, you suggested to take a look to ASTM A 453. Do you mean bolting material A 453 660 Cl.B (Ni base )?? 2) Metengr, about your reply, I understtod that although...

Dear All, I have to choose the heat exchanger bolting material suitable for Sour Service. The boltings are INTERNAL and so directly in contact with the process fluid ( completely in sour enviroment ). The material of this exchanger is carbon steel and we are in HIGH PRESSURE SERVICE and LOW...

Dear all, I would be grateful if someone lets me know which is the suggestable temperature limit for the apllication of DUPLEX material ( 22% Cr - UNS N031803 - SAF 2205 )- I learnt that, for ASME Code Div. 1 - Part II , the temperature limit is 315°C ( 600°F) ; over this temperature NO...

Dear unclesyd, thanks a lot for your reply. so you say that, with a good bolt up procedure there would be NO problem to use B7/B16 bolting even if the exchangers (i.e. flanges) are completely in SS.....??? we are going to tight that joints using an hydraulic bolt tensioners ( 4 tools at the...

Dear all, I am performing a design of an high pressure shell & tube heat exchanger. I have an external flanged joint ( shell flange bolted to tubesheet) and the tubesheet welded to the channel barrel (TEMA TYPE "C"). I have to evaluate two joints: Case 1) both the Shell Girth Flange and...

Dear gr2vessels, the cracks have developed, randomly in the tubes thickness of the tubes part near the shell side face of the tubesheet. I mean, where the tubes are in contact with the back face (shell side) of the tubesheet. I have some doubts about the correct work of the flanged & flued...

Dear UNCLESYD, first of all thanks for your reply. The exchanger has the tube to tubesheet joint strength welded and light expanded (without grooves)for the entire tubesheet thickness up to 3 mm from the shellside face of tubesheet. Please note that in my first post I mada a mistake. The...

Dear UNCLESYD, - the exchanger is horizontal with fixed tubesheet and an expansions joint on the shell - the chlorides may be in the tubeside - the tubesheets are in carbon steel with SS weld deposit on the tubeside rgds gengi

Dear all, has someone already experienced exchanger tubes damage due to stress corrosion cracking mechanism which originates and propagates from the inner surfaces of tubes?? It seems that this phenomenon is due to the concomitant presence of 2 factors: 1) RESIDUAL EXPANDING STRESSES ON THE...

Dear Mike, as per your suggestion, I contacted Leader Global Technologies and immediately I got from them the requested values for Dynagraph gasket with stainless steel core. For your and everybody info the values are: Y= 5000 psi m= 3 They said also that, the values suggested by ASME VII...

Dear eliebl, I confirm U-Stamp is not required but there is an AI. rgds

Dear all, I have to design a gasketed joint of a shell & tube heat exchanger using a Dynagraph Gasket. Could someone let me know this gasket values ( m & y ) to consider in calculating my flanges ? Thanks and regards GENGI

Dear All, I have to design NTIW (No Tube In Window) tubesheet of a vertical combined feed exchanger ( 1 pass tubeside with bellows at outlet ). NTIW tubesheet is not in the scope of ASME VIII div. 1 UHX as well as TEMA standard since not perforated for all the overall circular area, but, with...

Dear Metengr and jte, first of all many thanks for your reply. The material specification and product are for exchanger tubes- SA 213 or SA 249, plate/sheet SA 240, pipe-SA 312 and forgings SA 965 , designed at temperature greater than 343°C. My approach was to design the parts using the...

Dear all, could someone let me know about a requirement of Dual Certified Stainless Steel 304/304H with 0.04% minimum carbon content? Which allowable stress is correct to use in this case? Is that of 304 or 304H? Do you have some information about the reasons of such requirement? many thanks...

Dear SnTman, thanks a lot for your prompt reply!! I mentioned that I found Project Specifications which require the welded tubes to be cold drawn for the redusìction of the weld bead. As far as I know the cold draw is done for seamless tubes and I did not find any welded tubes suppliers which...

Dear all, I wonder if someone could help me on this topic. I would like to know if, for the welded exchanger tubes (stainless steel) there are any requirement regarding the weld bead (internal & external) such as limit height. There are Project Specifications which requires the welded tubes...