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  • Users: patchlam
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  1. 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.
  2. 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...
  3. 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...
  4. 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!
  5. 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)...
  6. 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...
  7. 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...
  8. 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...
  9. patchlam

    Permissible Variation in Diameter according to ASME VIII Div.1

    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...
  10. patchlam

    Gasket Centering and Inner Ring Material for Carbon Steel Flange

    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...
  11. patchlam

    PED 2014/68/EU Module A2

    Dear all engineers, Is anyone of you familiar with Module A2 (or A1 in earlier PED)? Basically I would like to confirm the level of involvement of Notified Body in this module A2. For example, do we need to get the Notified Body to approve our design calculation and construction drawing? Or do...
  12. patchlam

    Flange with EN1092-1 Dimension and ASTM Material in ASME VIII BPVC

    Dear all engineers, I am designing a pressure vessel (header) by using ASME VIII Div 1. The challenge here is the end user wants us to use the flanges with the dimension specified in EN1092-1 but we can maintain the ASTM material (such as A105). May I know is it allowed to use such kind of...
  13. patchlam

    PMA for ASME Carbon Steel Fittings and Flanges

    Dear all engineers, Has anyone done the particular material appraisal, PMA, acc to PED, especially for ASME materials like A-105, A-106 grB A-234 WPB? When we do the PMA for them, do I have to comply to content limitation for carbon, sulphur and phosphorus? For example, the cast analysis for...
  14. patchlam

    Carbon Steel for Low Temperature Storage and High Temperature Operation

    Dear all engineers, I have an enquiry which requires the design temperature of the metal at 350 degC. However, the minimum design ambient temperature is around -30 degC. We need to comply to EN13445-2 for material selection in this enquiry. Therefore, may I know which carbon steel of...
  15. patchlam

    TR CU 032/2013

    Dear all engineers, Good day to you all. May I know is that anyone has the experience in complying to TR CU 032/2013 (ON SAFETY OF HIGH PRESSURE EQUIPMENT)before? I just want to know, can I still use the ASME or EuroNorm as the design code for my pressure vessel? And later use the design to...
  16. patchlam

    Gasket Type between 316L and P11 Flanges, P11 and CS Flanges

    Hi Engineers, I have a problem with identifying the dissimilar flange materials. I have the two flange connections as shown below: 1. F11 with Carbon Steel Flanges 2. F11 with 316 Stainless Steel Flanges May I know which of the following below requires the use of insulation kit gasket? Thank...
  17. patchlam

    Dear all engineers, I have a pro

    Dear all engineers, I have a project where the corrosion allowance is not stated by client or any standard. Basically I need to use the carbon steel pipe to transfer the thermal oil inside a heat exchanger. The temperature can go as high as 410 degC and the pressure at 20 barg. May I know if...
  18. patchlam

    Phase Change of Supercritical CO2 (from liquid to supercritical fluid)

    Hi all, I am currently studying the application using the supercritical carbon dioxide as the process fluid. I am just wondering, will there be any problem if I introduce the carbon dioxide at liquid phase first, then only raise the temperature until the carbon dioxide becomes supercritical...
  19. patchlam

    Highest service temperature of SA 240 316 L

    Dear all, I am trying to use the SA 240 316 L plate for my product due to its good weldability. However, I just checked the ASME BPVC Section II, the maximum service temperature is only 454 degC. My product will be in operation at the temperature of as high as 600 degC at atmospheric pressure...
  20. patchlam

    Different Raised Face Diameter

    Hi all, Good day to all the engineers, May I know that whether are we allowed to connect 2 raised face flanges with different diameters of hub or raised face diameter? For example, the nominal pipe size is 2", the two diameters of the raised face are 84 mm and 96 mm respectively. If yes, what...

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