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.
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...
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...
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.
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...
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.
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
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...
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
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...
@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...
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.
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...
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...
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...
