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  1. patchlam

    Eliminate Gas Blow-by PSV

    Thanks for the insight. I thought this should be considered as operator intervention?
  2. patchlam

    Eliminate Gas Blow-by PSV

    shvet I tried to read through the ANNEX G. Do you mean the High-Integrity Protection System (HIPS) to either isolate the flow from HPS or progressively remove liquid from LPS?
  3. patchlam

    Eliminate Gas Blow-by PSV

    MortenA Thank you for your comment. I agree with your opinion, I was trying to reduce the relief load of the gas-blowby PSV by putting a mechanical stop, so that our top guys could accept from cost perspective.
  4. patchlam

    Eliminate Gas Blow-by PSV

    Apologies for my late reply. Thank you so much LittleInch shvet for your comments. I was trying to find if SIL3 Level indicator ESD function will be enough to prevent the blowby and eliminate the PSV. But I found nothing.
  5. patchlam

    Eliminate Gas Blow-by PSV

    Hi fellow engineers, May I ask if we are allowed to eliminate Gas Blow-by PSVs by having a level transmitter and a shutdown valve which closes during low level detected? Thank you for your time.
  6. patchlam

    Dip pipes in ATM or pressure vessels

    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.
  7. patchlam

    Dip pipes in ATM or pressure vessels

    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...
  8. patchlam

    SA-234 WP11, Class 2 not in ASME II D

    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...
  9. patchlam

    Impact Test if the thickness <5mm

    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...
  10. patchlam

    Impact Test if the thickness <5mm

    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!
  11. patchlam

    Insulation Material for Combustion Furnace

    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...
  12. patchlam

    Insulation Material for Combustion Furnace

    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)...
  13. patchlam

    SCH10s SS347H pipe for heat exchanger/pressure vessel

    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.
  14. patchlam

    SCH10s SS347H pipe for heat exchanger/pressure vessel

    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...
  15. patchlam

    Shell and Tube Exchanger for Hydrocarbon Gas Preheater

    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...
  16. patchlam

    Shell and Tube Exchanger for Hydrocarbon Gas Preheater

    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...
  17. patchlam

    Austenitic Stainless Steels - Chloride induced stress corrosion cracking (CSCC)

    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...
  18. patchlam

    Austenitic Stainless Steels - Chloride induced stress corrosion cracking (CSCC)

    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...
  19. patchlam

    Austenitic Stainless Steels - Chloride induced stress corrosion cracking (CSCC)

    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...
  20. patchlam

    Austenitic Stainless Steels - Chloride induced stress corrosion cracking (CSCC)

    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...

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