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  1. Sam Low

    Liquid Vapour Equilibrium in Liquid Cylinder

    Hi csk62 and Compositepro, Meaning eventually the liquid will be at same pressure and temperature with the vapour since it achieved equilibrium (even if it at the surface of the liquid, but I believed it will turn out to be the whole liquid slowly). Thank you!
  2. Sam Low

    Liquid Vapour Equilibrium in Liquid Cylinder

    Hi All, There is something lingering in my head lately regarding the liquid vapour equilibrium. To be honest, I am not too sure if the problem that I am going to ask here is about this topic. There is a pressurized cryogenic liquid at 6 barg under operating in a Low Pressured Cylinder (LPC)...
  3. Sam Low

    Is stainless steel considered as alloy steel?

    Hi Scuka/hydtools/EdStainless/drawoh, I should say that carbon steel is the steel found in nature which born naturally and without any additive element in the material. Alloy steel is a material formed by adding different elements into the carbon steel to make it having different properties...
  4. Sam Low

    Is stainless steel considered as alloy steel?

    Hi Guys! I would like to clarify if stainless steel material defined as alloy steel ? As far as I concerned, technically all the steels are considered as alloy steel since they are content other elements besides carbon and ferrous (which is carbon steel). For example; Stainless steel - Iron...
  5. Sam Low

    Thermal Bending

    HI desertfox, Thanks for the link! Will try to digest it. Thanks a lot![bigsmile]
  6. Sam Low

    Thermal Bending

    HI Dave, Noted. Thanks ya.
  7. Sam Low

    Thermal Bending

    Hi Dave, Thanks for the prompt reply! The skid base structure was welded completely but only client decided to weld a covered plate on top of the skid base structure. The thermal bending had been come into picture after all. Anyway, do you have any idea when the thermal bending, linear...
  8. Sam Low

    Thermal Bending

    HI All, There was a thermal bending on a skid base structure, basically the both end of the skid base has a bending towards upwards which is similar to the diagram below. I belived it is caused by expansion when hot and to shrink when cold steel. I was wondering why the skid structure...
  9. Sam Low

    ASME Relief Valve

    Hi LittleInch, There are actually three different types of Pressure Relief Valve (PRV), they are safety valve, relief valve and safety relief valve. Please find the link below for your reference. https://www.quora.com/?activity_story=30654223 However, one of the vendor proportional relief...
  10. Sam Low

    ASME Relief Valve

    Hi all, Is a relief valve allowed to use in PV since it might not be able to the event of sudden pressure rise? Definition of relief valve in ASME: - A relief valve is a pressure relief valve actuated by inlet static pressure which opens in proportion to the increase in pressure over the...
  11. Sam Low

    Buckling of Cylindrical Shell

    As what I have studied, COMPRESS follow Bergman (ASME paper 54-A-104) calculation to cross check the buckling effect on the vertical cylindrical shell. What if my vessel is horizontal orientation with external pressure and there is a heavy load on top of it? How could I calculate the buckling...
  12. Sam Low

    Buckling of Cylindrical Shell

    Hi All, Do you have any idea why the cylindrical vessel do not consider buckling in the calculation ? Is it already been considered in the thickness formula in UG-28 as per ASME section VIII Div. 1 ? Thanks in advance!
  13. Sam Low

    Pressure dropped during hydrotest

    HI mk3223, Yup, It did happen in real case.. I agreed that the temperature shall be maintained. However, there might be raining while the hydrotest is conducted halfway, which we have encountered this situation before.
  14. Sam Low

    Pressure dropped during hydrotest

    Hi All, As you all know, during hydrotest, the pressure might drop dramatically in the pressure vessel when the ambient temperature reduced (eg. in a rainy day) accordingly. Do you guys know the theoretical reason behind? This is my understanding.. According to the thermodynamic first...
  15. Sam Low

    Retention Time for Two-Phase Separator

    Hi PaoloPemi, I am now referring to the link below to do manual calculation of the vessel sizing, however, the final result is quite far from what I calculated.. https://petrowiki.org/Separator_sizing However, sizing with manual calculation : Diameter - 2.1 m / Length - 6.1 m Hi...
  16. Sam Low

    Weld to Weld Distance

    Thanks LittleInch, gtaw and 0707 for the reply! Seems like the main reason behind is to avoid overlapping of HAZ. Appreciate it much!
  17. Sam Low

    Retention Time for Two-Phase Separator

    We will come across retention time when we are designing the two-phase separator. 1. Could anyone here please further explain the definition of retention time? 2. How do we get the value of retention time ? 3. Can we use aspen hysys to size the two-phase separator? Thanks in advance!
  18. Sam Low

    Weld to Weld Distance

    Hi All, Does anyone know why industry practice weld toe to weld toe distance have to be more than 50mm? What are the concerns if the weld distance is lesser than 50mm? Thanks in advance!
  19. Sam Low

    C-Channel Configuration

    Hi LittleInch, Yup, you are right, Thanks for clarification of my inquires![glasses] I agreed with you that the C channel at upright position will have lower bending stress due to the high inertia of moment. I tried to use the tool you given in the link. Both option A and B given the same...
  20. Sam Low

    Preheat for welding

    Hi Weldstan, Thanks a lot for your info! [glasses]

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