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Hi starrproe, Double tubesheet heat exchangers or as well called Double tube technology heat exchangers are usually used when the contamination between the handled fluids has to be avoided. So any eventual leak can be detected using a suitable leackage connection which can cause a signal alarm...

Oscarvs, I should supply us more information about your heat exchanger in order to clearly defined the situation. Your flanges caould be made by ASTM A105 or ASTM A-350 LF2 thinking that the rolled material was made by ASTM A-516 Gr.70. You should take into account design data and fluid...

rmw, you are right about the hydrotest pressure. In fact the waterboxes are tested using equal or less than 2 bars. As I have already underlined you on my previous thread the waterboxes shell and flange could result to thin to sustain the local loads achieving a deflection that probably does...

OK mentengr, what do you want to say with "limited success"? Do you have any historical documents or any expirience on the matter? For "suggestion" I would like to know some confident quick fix options that I could use on my Condenser. As I know the best thing is to remove the waterboxes...

First of all, thank you very much for your prompt reply mantengr. As I have already told you the water box parts were not taken into account during the above mentioned inspection survey including the gasketed surfaces. Moreover I'm sure that the tighteming procedure was not used during flange...

Hi All, I have a big problem and sincerely I do not know how can I solve it. I'm talking about a surface condenser for Power Generation Plant which condense the steam coming from the turbine outlet. The project involve an existing condenser which has worked since 20 years ago. So my company...

Hi guys, First of all thank you for yours prompt replies. The issues underlined by Vesselfab are surely so interesting. I hope that the selected manufacturer will be able to do this type o lining on internal shell, internal nozzles and on flange face as well. Do SJones think that the provided...

Hi everybody, I have to purchase some pressure vessels and some filters which shall contain well water. The process specification says that the Vessel can be designed and manufactured taking into account as main material Carbon Steel plus 3mm of corrosion allowance plus glass flake as internal...

Hi Farzam, first of all the nozzle is connected to a process pipeline of 2" and consequently the nozzle will be subjected to a nozzle loads due to the related connected pipeline. As I know, the main problem relating to your matter is about the nozzle shape where the conical transition cannot be...

Hi everybody, does anyone know if the Maeterial SuperDuplex S32750 (as a billet, tube, etc...) is covered by ASME VIII Div.2? Can I design an Equipemnt considering ASME VIII Div.2 taking into account the mentioned material as a pressure parts? Any help on the matter would be greatly...

Ok Thermmech let me read the whole para of ASME so that I will be able to reply you. Could you help to find some technical information concerning the billet-type header? Your feed back would be greatly appreciated. Thanks in advance...bye

Hi Archimedex and thank you for reply. You understood very well the design pressure is 325 bars (g) as I wrote on my thread. Sincerely I did not look the Section VIII Div.1, anyway I do not agree with you on the limitations matter considering that I have already contacted several Air Cooler...

Thank you for your reply gr2vessels. I completely agree with you. So Div.1 will be a "must" to design the bundles considering also that the equipments shall be U-Stamp!!! Many thanks again...

Dear All, I have to buy eleven air coolers in which the bundle is designed as per follow conditions: -Design Pressure of 325 bars (g) - Temperature design of 90°C The material proposed, during the bid phase, from different Vendors is a Super Duplex Type 2507 in order to be in line with the...

Hi CodeJackal, thank you again for your reply. I have already sent to my client what I learned during our discussion. I hope to solve this issue as soon as possible. Bye Bye

Hi again CodeJackal, QUOTE If each can occur independently from the other, the vessel must be hydrostatically tested for each independent design condition. UNQUOTE This is my case, considering that the Vessel is designed for 7.25psi and full vacuum. Another important thing is that the Vessel...

Hi ME231, as I wrote on my thread UG-99(f) and as it seemed, I have the same problem or something like that. As I understood you have a differential external design pressure greater than the internal design pressure in respect to the normal atmospheric pressure. Therefore the Hydrostatic...

Hi All, I have had a discussion with my client about the Hydro Test pressure that could be used when a Vessel is designed for a Vacuun or Partial Vacuum. I have some Pressure Vessels that are designed for 0.5/-1 bar(g) and my client required me to hydro test the Vessel at a pressure equal to...

Please find enclosed the relevant X-rays map. http://files.engineering.com/getfile.aspx?folder=6a432cc4-bdef-49c4-922c-1ab0f9869180&file=NDT_BOOK.pdf

Thanks for both your helps. Anyway the Vessel is designed with Xray Spot (joint efficiency=0.85) so that the X-Ray are performed spot on main welds (longitudinal and circunferential) includung cross-welds. The top dished head in fully radiographed and LP tsted. EyeC Maybe I think that the...