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  1. sta07750

    What drives SCC in Caustic solutions at 150F? High pH or Chlorides?

    @tomwalz - Yes we plan to stress relieve all of our welds and bends to help out with that some. There are
  2. sta07750

    What drives SCC in Caustic solutions at 150F? High pH or Chlorides?

    I've done quite a bit of background, mostly because we are putting up just over a 1/4 mile worth of pipe for this and it's all in a crowded piperack. The pipe is cheap enough but the charge for fabrication/install/trace/insulation is going to be a few hundred thousand so I want to do it right...
  3. sta07750

    What drives SCC in Caustic solutions at 150F? High pH or Chlorides?

    We are looking to replace a 50% Caustic line. Our pipe spec references NACE and says to use PWHT Carbon Steel up to about 170F. We shouldn't get higher than 150F but it gets hot in Texas and the caustic is not always flowing in the pipe. I've read conflicting reports that 150F may be too high...
  4. sta07750

    Pressure Measurement and how it relates to TDH needed.

    In parallel operation the larger pumps should still be okay. If we end up cutting the flow of the large one for a few minutes we'll be fine. The pumps/motors are large enough to take the swing and those sumps are plenty large enough to accommodate a small delay. Everything falls kosher on the...
  5. sta07750

    Pressure Measurement and how it relates to TDH needed.

    Even with the two main pumps off, the header reads ~25 psig due to check valves and static head from other vertical runs further down the pipe. Either way, pump 3 should never pump alone due to the design of our sump system but to alleviate that possibility I was thinking about a back pressure...
  6. sta07750

    Pressure Measurement and how it relates to TDH needed.

    Please ignore the first attachment. I forgot to add the downturn at the end of the pipeline. New attached diagram shows this.http://files.engineering.com/getfile.aspx?folder=d1da1978-e988-49db-ad75-a84b2ca5419e&file=sump_Diagram.png
  7. sta07750

    Pressure Measurement and how it relates to TDH needed.

    Diagram attached. I've done a bunch of reading on parallel pumping. I've run the two main pumps independently (both off, one on, other on, both on) and got some pressure readings. My question stems from finding a TDH needed for the third pump. It's entirely different in flow, head requirements...
  8. sta07750

    Pressure Measurement and how it relates to TDH needed.

    I've got a header that is charged by two parallel pumps. I'm trying to tie a third pump in downstream. I'm trying to come up with a number for TDH for the third pump. My only available pressure measurement on the header is about 12 vertical feet below my available tie-point. When calculating the...
  9. sta07750

    Pumping into Pressurized Line

    Bimr: That's an interesting piece of equipment there, I'll have to look into that. LittleInch: I'm trying to avoid a VFD just to avoid the complexity. This is an industrial site with a relatively small lift station and is a little behind the times in terms of controls. I don't want to be the...
  10. sta07750

    Pumping into Pressurized Line

    I'm spec'ing out a new pump for our waste water lift station. The lift station will pump out via trash pumps through some discharge piping and into a common sewage header that runs to the treatment plant. The issue I'm having is that the common header is filled mostly by a another, larger lift...
  11. sta07750

    Carbon Disulfide Contaminated Sludge Disposal

    Would you happen to know the reaction taking place with the calcium carbonate and water?
  12. sta07750

    Carbon Disulfide Contaminated Sludge Disposal

    My employer has recently emptied a 500,000 gallon tank that was full of water contaminated with Carbon Disulfide (CS2) and other organics. It was pumped down and run through carbon beds to remove the contaminants. Now at the bottom of that tank we have about 6 inches of sludge (roughly 6000...
  13. sta07750

    Blower System Design Literature/Resources

    It's pulling air into a manifold that runs the length of the room then pushes it through a filter and back into the room the system is drawing from. Things like blower type and materials have already been determined by the previous system that is already in place. And controls aren't an issue as...
  14. sta07750

    Blower System Design Literature/Resources

    I'm a Chemical Eng by trade (and a fairly new one at that) but I've been asked to do some work on a blower system. It currently operates at 2500SCFM, SP is about 30" wCg. They want to double the capacity of the system but I don't know what will work from a design standpoint (run parallel...

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