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  1. longeron

    AMSE VIII vs. U Stamped Vessels

    Thanks guys. XL83NL is correct, the company is based in the UK.
  2. longeron

    AMSE VIII vs. U Stamped Vessels

    Gents, I'm quite new to pressure vessel codes, I usually deal with a specialized pump part. Vessels are used as part of a support system to keep the part I'm familiar with cool and clean while in service. I hear my customers talk about requirements for a U stamped vessel when the internal...
  3. longeron

    whats ur experience in sealing 1200 cP viscosity liquid?

    One way to reduce the problem during start-up is to use a liner of sorts that acts like a lip seal on the shaft sleeve. Imagine a PTFE gland gasket that extends into the seal chamber that then tapers down and "rides" on the shaft sleeve just a bit further into the seal chamber than the seal...
  4. longeron

    Mechanical Seal Face Distortion

    The other possibility is that the gland was distorted during installation. If the bolts fastening the gland to the pump were overtightened it is possible to distort the gland plate. This is fairly easy to look into- check to see if the high spots line up with the gland bolt holes. If so, this...
  5. longeron

    Seal flush Plan

    Each number is a different seal support plan. Plan 72 is the introduction of a buffer gas between the process and containment mechanical seals. This is used to "sweep" leakage to the containment vessel or to a flare/ collection header system. Pressure specified here is for the Nitrogen or...
  6. longeron

    Seal flush Plan

    Curious. 2.5 bar for buffer gas? To clarify things: is this a single seal or multiple seal?
  7. longeron

    Stationary bellows for Type C seal

    One advantage of this arangment is that with the bellows facing inwards the seal faces are within the barrier fluid flow allowing more heat transfer to the fluid. Rotating the bellows forces the seal faces towards each end of the glands and out of the flow. In my experience this allows the...
  8. longeron

    Mechanical Seals (Pressure Vessel Seal Support Systems)

    Just noticed something that might be confusing: In a Plan 52 the restriction I mentioned is between the reservoir and vent or flare header not in the circuit between the reservoir and seal. More often that not, major seal vendors can also supply these seal support systems and are happy to...
  9. longeron

    Mechanical Seals (Pressure Vessel Seal Support Systems)

    There are 2 basic systems that use reservoirs. API Plan 52: Unpressurized dual mechanical seals use a reservoir and piping to provide a circuit for fluid between two seals. The reservoir is often connected to a vent or flare header in such a way that leakage from the 1st seal can collect in...
  10. longeron

    Unkown Oring Material Viton or Nitrile - Looking for test

    I am pretty certain that DuPont will take a sample and perform some destructive testing to ascertain the composition. Greentweed or Parker would likely also do the same for you.
  11. longeron

    Sealing two flat faced flanges rotating with respect to each other

    Some rotary kiln manufacturers use a grease seal much like your description. That might be an avenue worth pursuing if the labby idea doesn't pan out.
  12. longeron

    misunderstanding in plan 52 + 53 + tandem seal !!

    The answer is that it depends. The availability of a flare or nitrogen header might help dictate which is used. The lubricity of the process fluid, concentration of solids, how toxic the process fluid is, or how high the seal chamber pressure is might push a user to a pressurized or...
  13. longeron

    Bladder accumulators versus regular seal pot

    I assume you're going with a pusher design with pefluoroelastomer o-rings- at least with the outboard seal. There are some other options available for hot services that require dual seals. Dual gas/steam seals have been put to market recently for high temperature services by at least two of...
  14. longeron

    select seal to coal tar

    Just curious- what kind of pump are you using in this service? At first glance a dual seal does seem to be a good option. A high viscosity service like this one makes start-up extraordinarily difficult for a seal lubricated by the process fluid. Not that start-up isn't going to be difficult...
  15. longeron

    Seal Cooling

    With some basic pump and process/fluid information your salesperson should also be able to come up with numbers regarding heat soak and heat generated by the seal faces to help you make informed decisions on seal support systems.
  16. longeron

    jacketed metering pump for molten sulfur

    The temperatures of molten sulfur are relatively low- 275-300F. Material compatibility of elemental sulfur is fairly easy. You should be able to get away with one of the more standard graphite/PTFE packings out there. As with other rotating applications you'll want to make sure that the...
  17. longeron

    Designing pump seals

    Maximum suction pressure is really only part of what is needed. The pump OEM should be able to provide information regarding the discharge pressure for the range of operating conditions as well as the seal chamber pressure. The seal chamber pressure depends upon the differential pressure...
  18. longeron

    Pump Warm Up Procedures And Hot Alignment

    JJ, Electricpete, one end-user I worked with had a list of pumps and the expected thermal growth offset for each asset. Their millwrights were expected to take that offset into consideration during alignment. That seemed to work pretty well- of course if the offsets are poorly calculated the...
  19. longeron

    Pump Warm Up Procedures And Hot Alignment

    After a quick search of the forum I did not see much discussion of start-up procedures for hot pumps. My question is three-fold regarding warm up: How quickly do you allow pumps to be warmed up? I've heard that most OEMs suggest about 100F per hour to allow even thermal expansion. How do...
  20. longeron

    API Plan 62

    BK19702 covered most everything. The only other point to make about wet steam, or pump start-up is to line the seam up early. I usually tell operators to get the steam to the seal a half hour before operating the pump. That way any condensate that has built up in the steam line to the seal...

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