Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. flexibox

    Material Options for Cryogenic Nitrogen Seal Faces

    Don't play with this. Go to a reputable seal company and ask for their support and I do recommend the 285 seal for this application. It's cost is high when compared to a local workshop but it's reliability will out weigh the cost and a local workshop does not understand mechanical seals in detail.
  2. flexibox

    Ammonia seal leakage.

    It sounds like you have reverse pressure issues. In order to establish the root cause you should include a P&ID of your system. How do you top up the system? You shouldn't need plan 11 with 53. Why do you have plan 11? Can you attached a seal drawing as well? I may be able to give you some...
  3. flexibox

    Feasibility of primary plan 02 in slurry service.

    yes Plan 02 is common on slurry pumps. be aware that you may have discharge pressure in the seal chamber depending on pump type.
  4. flexibox

    Anti Rotation Pin comes out of In Board Stationary Face.

    first of all barrier pressure must always be on before pressurising the vessel at all times. if you had reverse pressure you will most likely see product contamination in the barrier fluid. i dont see why the product crystalizes if its in the vessel, perhaps the product crytalizes or...
  5. flexibox

    Mechanical seal failure flow rate calculation

    Humaidq Max leakage in the event of failure needs to define the mode of failure. Looking at the drawing there are no pressures shown but if we assume flow through a 1/2" pipe with 1/8" orifice and 20PSI Delta P then leakage is around 1.5Gal/min. orifice area represents the bush clearance but...
  6. flexibox

    Seal leaks prematurely at High Pressure but holds at Low pressure

    check flatness of seals.
  7. flexibox

    seal plan change

    plan 53A is a dual pressurised seal. Are you pressurising the barrier? what are the units for pressure? what is the shaft size? it looks like you can just run Plan 53A with water and it should just need topping up once per month so you do not need water near the plan 53A vessel, use a...
  8. flexibox

    API PLAN 76

    This depends on the application. what is the duty? normally set at low pressure to alarm when seal leaks and you can also set a HH trip. Send in the data sheet and you may get a good response
  9. flexibox

    Mechanical seal failure flow rate calculation

    you cannot calculate this. rather strange set up, you have a fixed and a floating bush? normal seal leakage is approx 5-10cc/hr. are you injecting N2 where the green arrows are? normally there is only 1 bush and this appears to be for safety because the product is not environmentally safe...
  10. flexibox

    Anti Rotation Pin comes out of In Board Stationary Face.

    first of all when you say operating pressure do you mean the vessel pressure or barrier fluid pressure? i will assume the vessel pressure, if that is the case then you need to pressurise the seal at approx 45 -47 Kg/cm2. why are you using silicon vs silicon carbide? sounds like the seal face...
  11. flexibox

    Lubricating owing on cold service

    I do not have the actual data sheets, in essence we are sealing cold services and wish to establish what to use to lubricate the orings. Do you have any experience?
  12. flexibox

    Lubricating owing on cold service

    Need some advice on what to use to lubricate orings on an ethylene service at minus 160C. I was considering a smear of silicon oil, does anyone have experience in this field. I know if silicon grease is used it turns into powder and can cause problems. Thank you in advance.
  13. flexibox

    Multiple springs outside the product being pumped

    You can use special materials such as Hastelloy C to combat that. Without more data it's difficult to advise however if you have such a product you may need dual seals!
  14. flexibox

    Plan 01 port/drill size

    1/2"NPT with 1/4 drill through hole.
  15. flexibox

    Multiple springs outside the product being pumped

    External spring designs are a very good design and not necessarily pressurised internally. Slurry seals use external springs, some API seals are external design with standard OD Balance. They are used on high viscous or abrasive application. As the seal slides the dynamic oring slides on a clean...
  16. flexibox

    Seal leak detection strategies

    Personally I would not go below 4 ltr capacity.
  17. flexibox

    Seal leak detection strategies

    David In using a single seal, any leakage will drip into the drain cavity to atmosphere. In this arrangement the leakage detection vessel/container need not be designed as a pressure vessel. A simple pot with a level switch or transmitter will suffice. The issues I see is that if you want to...
  18. flexibox

    Sealant for diesel exhaust environment

    Try using graphoil gasket material. You will need to clamp it in. Send a drawing of the arrangement for comment.
  19. flexibox

    O-Ring vs Square Ring vs Quad Ring vs Flat Gasket

    Not sure which pumps you are manufacturing but all the pumps I have worked on have always used ORings. On the other hand ORings are readily available and they work well. I do not know what sq section availability is but my advice is to stick with std BS orings. Cheers
  20. flexibox

    Meaning of Register fit for Mechanical Seals

    For the gland plate you can apply e8 H8 tolerance to achieve a spigot fit (registered fit) Check this and you will see the numbers. E8H8 is found in a limits and fits book! Good luck.

Part and Inventory Search

Back
Top