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  1. gte682n

    Recommended DAF Manufacturers

    Hello, I am looking to specify a DAF unit for process waste water treatment from an organic chemical process. I would like to make inquiries with well known and trusted vendors, preferably ones that also offer lab/pilot evaluation services. Could I get recommendations from this forum? An...
  2. gte682n

    Holtec aka Tweener Baffles

    This is my first time coming across these types of baffles in a heat exchanger. The service is cooling water (cold) & oily water (hot) in a 3 pass shell and 3 pass tube exchanger. One benefit that I can see is the reduced pressure drop on the shell side due to the non-segmented nature of the...
  3. gte682n

    Oil in Water Analyzer

    Hello, I am looking for an inline oil in water analyzer for an effluent stream to alarm on possible spill conditions. Typical oil content is 500-2000 ppm. I have received some information from Analytical Systems Keco for a continuous type of analyzer, and it looks promising. Does anyone have...
  4. gte682n

    Line Clearing Purge Requirements

    Hello, I would like to size a N2 purge to clear a 3" diameter line, 500 ft in length. The material that I am trying to push out of the line is a molten rosin. Viscosity is 15 cP, and will solidify at ambient temperatures. This line is steam traced, but the preferred practice it to blow this...
  5. gte682n

    Slug flow vs Wave Flow

    Here is an iso of the line in question. Thank youhttp://files.engineering.com/getfile.aspx?folder=4957a919-78a2-4577-808b-57b6286b233c&file=slug_flow.pdf
  6. gte682n

    Slug flow vs Wave Flow

    Hello, sorry for my delayed response. LittleInch, I am not familiar with a vertical loop slug breaker - how would this work?. I have searched the forum and see "slug catcher" mentioned. Are you referring to the same thing? There is visible movement in the line when it approaches the tower. The...
  7. gte682n

    Slug flow vs Wave Flow

    Hello, I am evaluating the flow regime of a 3" line that handles a 2 phase mixture. Aspen Plus predicts slug flow in the 3" line when I reach my destination pressure. The vapor volume fraction is 87% and the mixture velocity is 48 ft/sec at the end of the line. When I increase this line to 6"...
  8. gte682n

    Structural Frame Check Please

    I should clarify that a new structural design was completed for the new, larger exchanger. However, this new design will not be updated due to the exchanger moving 3 inches further away from the tower.
  9. gte682n

    Structural Frame Check Please

    Hello, this is a larger exchanger that is replacing an old one in the same location. The new exchanger is 10,000 lbs vs 6,000 lbs for the old. I have no reason to distrust. I just wanted to get a gut check from others who have a better instinct than me. I wanted to make sure it makes sense that...
  10. gte682n

    Structural Frame Check Please

    Hello, I have a project that will be hanging a new heat exchanger off of a distillation tower. I've attached some structural drawings to give an idea, realizing that this isn't complete detail for an in depth analysis. The nozzle projection from the tower has changed and will move away from the...
  11. gte682n

    Buffer Tank Vented to Vacuum Tower

    thread124-420364 Hello, this question is related to my previous post above. For the buffer tank that has a dip pipe on the liquid fill line and a vent to a vacuum tower, what is the consequence of not sealing the dip pipe? I would imagine gas being drawn back to the tower via both the vent and...
  12. gte682n

    When to Pickle/Passivate a heat exchanger?

    Thank you. I should have chosen my words better. I meant to ask how to know IF it is necessary? Is this determined by metallurgy, fabrication method, or process? Is this something that is always done to be safe? Thanks again,
  13. gte682n

    When to Pickle/Passivate a heat exchanger?

    Hello, I have a new reboiler that will be going into service in a few months. The tube side is AL6XN and is in oil service (pH=5), the shell side is 316L and is in Dowtherm A service. I have heard of pickling exchangers before, but do not know when it should be applied. Are there some...
  14. gte682n

    API 650 Circulation Vents

    thread1452-317354 Hello, I have a copy of this standard and was not clear on if it should be applied to fixed roof tanks as well with regards to the circulation vent requirements. I have several fixed roof tanks on site that have these vents. The fabrication drawings reference API 650 as the...
  15. gte682n

    Multiple tank vents to prevent roof corrosion?

    http://www.eng-tips.com/viewthread.cfm?qid=317354 Hello, the thread above describes what I am referring to. API 650 refers to Welded storage tanks, but Appendix H refers to the fixed roof portion of internal floating roofs. My tank is a fixed roof tank, so I'm not sure how it applies. This was...
  16. gte682n

    Multiple tank vents to prevent roof corrosion?

    Hello, I have a project to install a new storage tank. A question came up regarding the basis of several vents that are installed on existing tanks in the same service. The existing tanks have 12 vents installed all around the circumference of the roof. It was mentioned that these vents are to...
  17. gte682n

    When will Parallel Pumps Fight?

    Hello, This was inspired by the recent thread on series vs parallel pumps. I would like to understand in general terms when to worry about 2 pumps discharging into a common header fighting with each other? If the two pumps and associated piping are identical, then they back up to the same...
  18. gte682n

    Heat Exchanger expansion joint in the correct location?

    Hello, I received the following response from the designer: "The COMPRESS model indicated excessive stress in the tube sheet due to the unsupported load below the expansion joint. Most of the dead weight would be suspended from the expansion joint if below the supports. When the support lugs...
  19. gte682n

    Heat Exchanger expansion joint in the correct location?

    Here is the drawing of the exchanger. I was unable attach 2 files to the same post.http://files.engineering.com/getfile.aspx?folder=3da0d219-513c-47d0-8200-9d5bae25bd87&file=exchanger.pdf
  20. gte682n

    Heat Exchanger expansion joint in the correct location?

    This is a fixed tube sheet, single pass tubes. Max operating temp is 660 F. AL6XN tubes, 316L shell. I have attached a drawing of the exchanger and a detail of the supports. I hope this helps. Thank you for your attention thus...

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