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  1. imatasb

    Duration of a hydro test (hydraulic test)

    Dear colleagues, I have recently seen a procedure for hydro test of atmospheric vats saying that they need to be filled with water and then remain filled for 24 hours. In my case the vessel is 90 m3 316L vessel. The vessel was designed according to AD2000 and has a design pressure of 50 mbarg...
  2. imatasb

    Trim cooler Design (flooded condensers)

    Sorry, I forgot to mention that it won't act as a total condenser. It will condensate an additional amount of 300 kg/h of vapour (so 1000 kg/h will remain as vapor).
  3. imatasb

    Trim cooler Design (flooded condensers)

    Dear colleagues, I am currently working in a project which includes a decrease in the operating pressure of the stripper in the hydrobon unit (hydrotreatment of naphthas). Due to this decrease the temperature on top of the column will decrease too and the area of the aereocondenser at the top...
  4. imatasb

    Nozzle position (tubeside) in condenser with 8 passes vertical H bundle layout

    Good afternoon colleagues, I am currently designing a condenser that will complement a current aero condenser. The new condenser is going to be an AES type with 8 passes on tubeside (cooling water), 131 tubes, H bundle layout and a 45º rotated square pattern (company standard for condensation...
  5. imatasb

    Maximum velocity in tube side

    ...of 10".Tube count =51 with 373 " tubes. material is carbon steel. The density at process conditions of GN is 17,45 kg/m3 so it results in a Rho *V2 value of 9616 kg/(m·s2)or 6460 (lb/ft s2) The pressure drop is 0,179 kg/cm2 or 2,5 PSI. If I use a smaller shell size, say 8", the dens·V2...
  6. imatasb

    Food grade glycol plant

    Dear MJCroning, I was talking about propylene glycol.
  7. imatasb

    Food grade glycol plant

    Good morning collegues, I work in planta producing glycols. Last week my boss mentioned the possibility of producing a new grade in our products, food grade. Could someone explain to me or lead to a resource about which are the main changes to be done in a chemical plant to be able to reach...
  8. imatasb

    Maximum velocity at nozzles for two phase fluid

    ...the new heat exchanger and noticed that the velocity in the outlet nozzle was 6.9 m/s. Whilst hte criteria of velocity for tubes are quite clear: *3-5 ft/s (0.9-1.5 m/s) for liquids *50-100 ft/s (15-30 m/s) for gases I am not sure for a two phase flow. Could anyone which velocities could...
  9. imatasb

    Tube side design temperature

    Good morning colleagues, Whilst specifying the design temperature for a pipe is quite straightforward, the maximum temperatura that can reach the fluid that flows across a certain pipe, I am not so sure when it comes to the design temperature on the tube side oh a shell and tube heatexchanger...
  10. imatasb

    Tracing pipes material

    Dear colleagues, We are designing a 8" pipe that needs to be steam traced (low pressure steam 4 barg). The specification of the pipe is ASTM A-312 Type 304 (stainless steel). According to the customer specification all the tracing tubes should be done in 1/2" 150# carbon steel (ASTM A-53 Gr.B...
  11. imatasb

    New pipe for oxygen service

    iainuts, Thank you for your answer. I have already a got adossier with the velocity impingment curves but there are no recommendations for the materials for internals, gaskets,etc..
  12. imatasb

    New pipe for oxygen service

    Thanks you for your answer, I forgot to mention the temperature of the oxygen flow which will be 25 C. The flow will be pure oxygen. I have already specified that the equipment will be used for oxygen service but I will be insterested in knowing some details about the kind of materials they...
  13. imatasb

    New pipe for oxygen service

    Dear colleagues, I am designing a new 3" pipe for oxygen service. The pressure at the inlet will be 7 barg (101 psig). At the end of the line will be a pressure control valve, followed by an orifice plate and a flow control valve. The material for the line will be seamless steel ASTM A-312 Tp...
  14. imatasb

    CUTWATER?

    Thank very much for the explanation. As Chedarcaveman says it is a pity that no pictures can be attached. A picture would probably make the explanation a lot easier. Thanks
  15. imatasb

    CUTWATER?

    Hello, I came across the word Cutwater today and I have never seen before talking about pumps. (I think it's like an american word)The meaning is not very clear to me. Could someone just explian what is the cutwater? Thank you
  16. imatasb

    Activity coeffcient in solutions containing salts

    ...on the conditions) that the vapour mixture,the vapour behaves as an ideal and the Poynting factor is negligible. So the equation becomes Ki=Pvap * Activity Coeff for Liquid / Total Pressure Based on some experimental data and I have calculted a activity factor around 0.22 for ammonia and 1...
  17. imatasb

    Octanol-water scrubber

    Hi sshep, yes, the solubility is the main problem but for for my apllication I would be speaking of around 1 m3/h of water which I can reuse from another process and in my case i don't to recover the octanol from the scrubber, h2 flowrate maximum is around 150 m3/h so the octanol amount is not...
  18. imatasb

    Octanol-water scrubber

    Hi, I am designing a scrubber to absorb the octanol present in a hydrogen stream. I am planning to do this with water (solubility of octanol in water @25 C is 0.05 %). The amount of octanol to me removed is 0.3-0.8 g/m3. Has anyone got experience in the system octanol-water? I haven't got any...
  19. imatasb

    Combination coorection factor

    Hi fellows, I was doing some relief calculation numbers but there is something which I don't see very clear. According to API 520 if I have a bursting disk and a relief valve after I: -Use a 0.62 as discharge coeffcient for the bursting disk -There is no combination correction factor for the...
  20. imatasb

    Hydrogen dispersion

    Hi, sorry for the delay but I have been out a couple of weeks. Dear Milton, Thank you very much for your information. I have been looking in your webpage I have seen all that information you are showing in it. I know that the formula I was using is the same one used for a liquid release but...

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