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Dear LittleInch, MJCronin and JStephen, Thank you so much for all your replies, really appreciate them. Actually, the top inlet is something we normally do, but I just thought probably a dip pipe is required due to the height of the vessel itself. Thanks again for your comments.

Dear Engineers, Good day to y'all. I have a vessel with dimensions like 7 meters diameter and 15 meters height. Just wondering, for my inlet nozzle (located at the top of the vessel), is it necessary to have the dip pipe for that nozzle? Is that any guideline I should follow, for example what...

Dear Engineers, Good day to you. Recently, I found out that SA 234 WP11 Class 2 is not listed in ASME II D. My supplier could only supply me Class 2 instead of Class 1 due to stock issue. Can anyone advise how can I use Class 2 in this case? Or does anyone know what is the reason that SA 234...

Dear all, Thanks for the replies. Maybe let me elaborate further on my questions. Basically we are trying to fulfill the requirement as per Section 7.5, Annex I, PED where its bending rupture energy measured on an ISO V test-piece is no less than 27 J, at a temperature not greater than 20 °C...

Hi Engineers, I am having the following pipe material and size: Material: SA 106 B pipe Size: 1.5 inch SCH 40 (3.68 mm thickness) And I have to comply to PED impact test requirement. Question: Is it possible to do impact test on 3.68mm thk? Thank you!

Dear moltenmetal, Thanks for you reply. I have applied a layer stainless steel lining to cover the superwool/isowool blanket, thus I guess it is one of the ways to ensure that the insulation layers are intact. Hopefully this is acceptable. If superwool/isowool can be used for combustion...

Dear Engineers, Good day to you. I am designing the ducting system for the combustion furnace. A supplementary burner is used and the highest adiabatic flame temperature is around 650-675 degC. And I have surveyed two products, which are superwool blanket (1200 degC) and pyro-bloc (1260 degC)...

Hi XL83NL, Yes, I have considered 1 mm corrosion allowance and the thickness is above the minimum required thickness + corrosion allowance. Our pipe size is around 2.5 - 3.0", and yes we are asking for pipes instead of tubes.

Dear all engineers, Good day to you. I am designing a heat exchanger/pressure vessel using SS347H pipes. In order to save the weight of the unit, we proposed using SCH10s thickness pipes. I have checked with ASME VIII Div. 1 thickness calculation and thinning of the thickness during bending...

Dear all, I really appreciate all your replies. As mentioned by the majority above, I believe the heat exchanger should be designed for the intermediate pressure feedwater (or hot oil) to flow within the tubes and the lower pressure fuel gas to flow through the shell. With intermediate fluid...

Dear all engineers, I am trying to design a shell and tube heat exchanger to preheat the hydrocarbon gas. This is to ensure that the hydrocarbon gas that we are going to supply to the Gas Turbine will not going to form hydrate. However, I am concerned with the temperature gradient across the...

Dear weldstan, I totally understand that, and probably I would change all the actuation tubing from SS 316 to duplex SS. Dear Chumpes, Thanks for your input, guess you had just given me the idea on checking the concentration of oxygen and chloride. Dear georgeverghese, I totally got your...

Dear pradipgoswami, Those are really good references, especially for someone like me. Thanks. I will explore the DSS(2205/31803), especially on its cost. Dear EdStainless, For the heat exchanger (or waste heat recovery unit) that we provide, the heating medium is either hot oil or inhibited...

Thanks for all replies. Dear EdStainless and ironic metallurgist, actually this is the first time I encountered this issue after reading a Norwegian specification. The basis for material selection is NORSOK M-001. Before that, we just select the material based on ASME VIII and API 560. The...

Dear Engineers, Good day. Recently, I read that austenitic stainless steels may suffer from external chloride induced stress corrosion cracking (CSCC) when exposed to a combination of tensile stresses, chlorides, water, oxygen, and a temperature threshold. The threshold temperature which the...

Dear all Engineers, My pressure vessel is fabricated of 1.5" SCH 40 SA 106 B pipes and under internal pressure. However, the pipe is not straight, but is bent into a helical shape with the minimum radius of 17D. May I know what is the ovality tolerance that I should follow during the pipe...

I totally agree with your point. However would you please advise what are the implication you meant above?

Hi moltenmetal, The low temperature was set simply to cater for the start-up of the equipment during winter. Thanks!

Hi moltenmetal, Thanks for your reply. Just wanted to further explain on my process, I am using LF2 material due to the extreme low ambient temperature at nearly -25 degC. However, during operation, the metal temperature will reach around 350 degC with the thermal oil inside. In this case...

Dear all engineers, Good day to you all. I have a question on the spiral wound gasket material. Normally what I have found for the centering or inner ring, the material is always in SS 304 or SS 316. I am using A 350 LF2 flanges for my services, if I am going to get the spiral wound gasket for...