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  1. tesser

    Heat Transfer Rate formula

    I think you are missing a flow rate in your equation and you should have: Q = 500 x G x Cp x SG x Delta T. G = Flow Rate in US Gallons per minute. The 500 x SG part of the formula converts the US Gallons per minute (G) to lbs/hr. An American Gallon is different from an Imperial Gallon. If...
  2. tesser

    API 682 (3rd edition) mechanical seal temperature limit

    I'm with sureshpksk. The 682 coding on the drawing is C2A2A2353B61 as he says, but the fluid details bit gives 23 & 52. Arrangement 2 (A2) is a dual unpressurised (tandem)seal. But 53B is for an arrangement 3 (A3) dual pressurised seal with a pressurised barrier fluid, pressurised via a bladder...
  3. tesser

    Heat Transfer Calculations

    There might be some useful information and calculations at the Spiraxsarco website: http://www.spiraxsarco.com/resources/steam-engineering-tutorials.asp
  4. tesser

    Oil Cooling

    You can find various correlations at: http://www.cheresources.com/convection.shtml Also you will possibly find some useful information at: www.cheresources.com The correlation references came from this site
  5. tesser

    Heat Transfer Book Recomendations

    I used to find that Kern's book 'Process Heat Transfer' was pretty useful. Also you might find something useful on the Spirax Sarco website 'steam engineering tutorials'
  6. tesser

    Ebook, PDF, PPT about chemical engineering

    You could also try: www.cheresources.com There is plenty of useful information and links to other sites here.
  7. tesser

    Sealing Brine at 80¦C (176¦F)

    I have not used this site for a while (I have retired) but try www.nickelinstitute.org Under 'Nickel and its Uses' go to technical literature and type 'brine' in the search. Most of the literature is available as free pdf files. You may have to register but it is free or used to be
  8. tesser

    Unkown Oring Material Viton or Nitrile - Looking for test

    If your choice is between Viton and Nitrile and you know that it is one of these two (although there are several varieties of Viton), then there is a significant difference in Specific Gravity between the two. I can't remember the numbers now but I think Viton SG is around 2.0 and Nitrile around...
  9. tesser

    AISI 316 in Amine Solutions and NACE MR0175/MR0103

    According to later versions of NACE MR0175/MR0103 there are temperture limits on the use of AISI 316 in sour environments. If I interpret NACE strictly then I am confined to temperatures below 60ºC. I am talking about a liquid amine stream loaded with H2S. For example 25%DEA in water at 95ºC...
  10. tesser

    Compatibility between N-Hexane & Aluminium

    You could try the following site which allows you to mix chemicals and gives a reaction prediction. I am not sure this would be adequate for your purpose, but I know I have used it to satisfy a similar enquiry (not aluminium and hexane though). Beware of American spelling i.e. Aluminum...
  11. tesser

    Pumps in Benzene Servive

    Benzene is considered as extremely carcinogenic. I think the latest TLV value is 0.5 ppm. Usually on Benzene duties a dual pressurised seal is recommended if a mechanical seal is required. If elastomeric (rubber) O-ring materials are needed, then Fluorocarbon (Viton) is limited to relatively...
  12. tesser

    Dissolved gas in a liquid - units problem

    Thanks guys, at least I wasn't missing something totally obvious. I should explain that I work for a mechanical seal manufacturer and as data comes down to us from process people, to rotating equipment people, to pump manufacturer to seal maker, information tends to get filtered (left out) not...
  13. tesser

    Dissolved gas in a liquid - units problem

    This may be very obvious, but not to me I'm afraid. I have a pump data sheet in front of me. It gives the product as crude oil with an SG of 0.752 @ 22ºC and a Vapour Pressure of 8.5 Bara at 22ºC. Under H2S concentration it gives '92250ppm v'. My question is what does '92250 ppm v' really mean...
  14. tesser

    Thermal expansion for trapped liquid in pipe

    Not quite sure what you are after, but if you can get hold of Chemical Engineering magazine dated May 1989 there is an article dealing with relief valve sizing and predicting potential pressure rises caused by thermal expansion of liquids in piping.
  15. tesser

    Gas Solubility in Oils

    Can anybody point me in the way of data on gas solubility in lubricating oils (ISO VG 20-30 grades say). What I am particularly interested in is the solubility of Nitrogen and the relationship between solubilty and temperature. I had always assumed that as temperature increased gas solubility...

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