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  1. sav455

    Fire case Relief

    Hi Ajs, I just posted my reply to Jefka's post only to see yours was posted also. I am wondering if you could perhaps elaborte a little more about increase in wetted area and heat rate. I think the wetted area stays the same because it in a way is indicative of hold up volume in the vessel which...
  2. sav455

    Fire case Relief

    Thanks Jefka. In this case we are not changing any vessel. The only thing which might change is the composition which will change the latent heat of boiling and hence the relief.Same goes with the gas case also. I have a related querry in use of HYSYS depressuring utility for estimating the gas...
  3. sav455

    Fire case Relief

    Hi All, I am wondering if the relief rate form a PSV sized for fire case is dependent upon plant feed rate. Let's say we want run an existing plant at 130% capacity and do the debottleneck work. Do we need to rerate the fire case relief also?? The equations in API 521 don't indicate the same...
  4. sav455

    Gas Blowby case

    Thanks a lot. Sav
  5. sav455

    Gas Blowby case

    Hi, I am trying to calculate the gas blowby case flowrate from high pressure separator to low pressure separator. I am wondering if I can use the max Cv of the liquid level control valve. The Cv by definition is the related to the flow rate of water at 1 psi pressure drop. In gas blowby case we...
  6. sav455

    calculating N2 flow through a flexible hose

    Is it not a choked flow problem? With an supply pressure of 90 psig to 1 atmosphere. I think you will get critical flow through the hose....
  7. sav455

    Volume reduction in mixing of liquid hydrocarbons

    Thanks Biginch and JMW. JMW, you did not go off the topic. In fact you talked very much in relation to what I am supposed to do. Thanks. SAV
  8. sav455

    Volume reduction in mixing of liquid hydrocarbons

    Hi All, I am required to calculate the reduction in volume of liquid hydrocarbons upon mixing. The detail of the problem is as follows: I have three stream: naphtha, distillate and gas oil.These ssreams can be routed to different tanks.I did a quick simulation in HYSYS and found that there is...
  9. sav455

    Mine diesel production

    dcasto, the sulfur in Naphtha is 1 ppm and that in Distillate is 130 ppm. This is the total S content. I have the S distribution over the entire boiling range also,so I know what cut range we are looking for. Milutin,Whatever preliminary work I have done shows that It is possible to meet all...
  10. sav455

    Mine diesel production

    Ammm...I think I should not call it diesel. This is a stream which is back end of naphtha and front end of kero or Distillate. Due to the 15 ppm thing and associated hydroprocessing limitation we have to produce some stream for internal consumption using distillation route. The only deemed feeds...
  11. sav455

    Mine diesel production

    And this is distillation based scheme. I have to get some cut from these two feeds.Sorry about missing on this information in the first post.
  12. sav455

    Mine diesel production

    Hi, I am working on developing a scheme for production of 15 ppm diesel from naphtha and kerosene stream. Basically I am trying to get to some scheme which gives me minimum heater duty, minimum no. of stages,min. col diameter, optimum tray location for both the feeds and optimum diesel draw...
  13. sav455

    Freundlich isotherm data?

    Hey, I think these kinds of data are not readily available. From whatever you wrote, it looks like you want to use activated carbon for adsorbing the hydrocarbon from amine stream before sending it to the regenerator. I would probably prefer doing my own experiment and get my own data. Probably...
  14. sav455

    Electrical Heaters for Process Unit

    Thanks Quark.
  15. sav455

    Electrical Heaters for Process Unit

    Thanks Quark and Doug. The cost of one 1 MWh = 45 $ HP steam = 17.76 $/tonne Both are canadian dollars. Regards.
  16. sav455

    Electrical Heaters for Process Unit

    Thanks 25362.
  17. sav455

    Electrical Heaters for Process Unit

    Thanks quark. This is not a homework problem.I think I did not define it clearly. My first post was ......bad. I am doing this comparision at the installation stage.The steam is taken from a steam generation unit which is already existing. This steam is to be supplied to the heater as mentioned...
  18. sav455

    Electrical Heaters for Process Unit

    Hi All, I have a heat exchanger which heats a small stream (referred to as slip stream, flow not known)to 250 degC using 4800 kPag satrated steam. The amount of steam for this heater is 159 kg/h. The heat duty as given in heat balance is 0.26 Gj/h. I was just wondering if it makes sense to...
  19. sav455

    PSA off gas line sizing

    Thanks 25362.
  20. sav455

    PSA off gas line sizing

    Thanks Montemayor.

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