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  1. Chpal1984

    PLan 53B + 61

    I've seen 53B with 61 on high temperature pumps, on your pump I agree with you it looks unnecessary
  2. Chpal1984

    GAS SEALS

    Hi, I'm sorry my answer didn't help you. I'm afraid I find your phrasing confusing. If you have a specific application you are thinking about, then maybe that would be easier to offer help on.
  3. Chpal1984

    GAS SEALS

    I'm sure there are others, but below here are a few of the advantages/disadvantages that jump to mind: Advantages 1. Non-contacting and don't generate heat 2. Low power consumption 3. Generally use inert N2, which generally doesn't contaminate fluids 4. Can be a lot longer lasting if operated...
  4. Chpal1984

    plan 53b and 53c difference?

    Not really sure what information you are looking for. Like you said the 53b uses a bladder accumulator. The barrier is pressurized using a gas, and this bladder isolates the gas from barrier fluid (unlike a 53a). The 53c uses a piston accumulator to pressurize the barrier fluid. Generally you...
  5. Chpal1984

    Switch from API 53B to API 53C

    I think the main reason we tend to use oils is because the water has a narrow temperature range it can be used for. So using an oil as a default, generally means you don't have to worry about it as much.
  6. Chpal1984

    Switch from API 53B to API 53C

    Hopefully you've resolved this problem by now, but here is my 2 cents anyway. It would appear to me that you've found the most likely fault, high pressure differential. A plan 53C should solve this problem over the inboard seal, however over the outbound seal you have a 85 barg pressure...
  7. Chpal1984

    High pressure window sealing

    I would just say the obvious, make sure you check the differential thermal expansion.
  8. Chpal1984

    Mechanical Seal for Nitric Acid

    This is always a good source for these queries https://www.parker.com/literature/ORD%205700%20Parker_O-Ring_Handbook.pdf In this case it depends on the concentration of Nitric acid. If its between 0-50%, then you can use viton. Otherwise your looking at perfluoroelastomers I'm afraid.
  9. Chpal1984

    API pump pressure casing connection : flange vs thread

    API 682 - Pumps—Shaft Sealing Systems for Centrifugal and Rotary Pumps, has a lot of additional design requirements for the mechanical seal. It could be that the threaded connection is probably ok, because of some addition requirement in 682. Interesting question though
  10. Chpal1984

    Face seal - helium leak testing

    Not really enough information. What temperature and pressure is the helium? When you say face seals are you o-rings? If so what material?
  11. Chpal1984

    Slewing Ring Selection for Wind Turbines

    If I remember correctly there are different load cases in IEC 61400 (including normal, extreme operational, extreme conditions etc as you list), each load case also has a partial saftey factors defined in the standard. Then you design to the highest load. Now I haven't heard of this 'service...
  12. Chpal1984

    seal face material selection.

    Silicon Carbide or Tungsten Carbide should be fine
  13. Chpal1984

    seal face material selection.

    probably Silicon Carbide, but like the previous post says it depends on the fluid you are sealing
  14. Chpal1984

    seal face material selection.

    When you get to those temperatures you can't use elastomers. So you need to use something like a metal bellows seal, Eagleburgmann and John Crane are 2 good suppliers
  15. Chpal1984

    Selection of seal plan

    Hi Mitesh, With a plan 53B system the seal is running on the barrier fluid, so you don't have to use re-circulation plan. Now there are alot of good reasons you might prefer to have circulation in the seal chamber, for example if you process is very hot a plan 21 could help extend seal life...
  16. Chpal1984

    max pressure seal design

    @awhicker84 no one needs FEA, you could do it all with testing if you wanted/could afford it. Also when I say FEA I wasn't suggesting going to spend £10k on an expensive 3D FEA software (ANSYS ABAQUS etc). FEA is a mathematical method that can be applied to 1D, 2D and 3D problems, and there are...
  17. Chpal1984

    Valve Seal design - Issues with holding pressure

    The O-ring compression is key for a 5.33 CS you should have between 0.55 to 0.66mm (depending on manufacturer/material grade it might vary) You have 5.6% o-ring compression and you need at least 10%. I would think this lack of compression easily explains why you aren't getting above 350psi.
  18. Chpal1984

    Increasing motors power rating

    Hi, I have a motor that has a power rating of 45kW. I have a test where I could really use nearer 50kW. On the motor's nameplate, it has a a 53kW power rating at a 440V 60Hz and a 45kW power rating at 400V 50Hz. If I bought a power converter to convert supply to 60Hz, would I be increasing my...
  19. Chpal1984

    max pressure seal design

    Oh dear. I would suggest you test to the worst case conditions. Worst case temperature, pressure and speed. I'm guessing if you are the only engineer you don't have a huge seal range In parallel I would build an FE model, i googled this look alright...
  20. Chpal1984

    max pressure seal design

    Designing mechanical seals is relatively niche. Most seal manufacturers will have they own custom software for designing seals. I'm not quite sure what you are trying to do? The seal manufacturer will tell you the max operating pressure for their seals. Call them up if you can't find it on...

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