Recent content by Chpal1984

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

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...

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

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

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

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...

Silicon Carbide or Tungsten Carbide should be fine

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

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...