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  1. Unotec

    Multistage centrifugal boosted with piston pump

    We have this discussion going around regarding the booster pump for a multistage centrifugal. We need to boost into the multistage due to filters between the pumps. Typically, I use a centrifugal pump as a booster. Some people here are proposing using a piston pump for boosting. This doesn't...
  2. Unotec

    Plate & Frame Hex hot vs cold sides differential pressure

    Good day, We have a problem with a crude oil cooler. The oil comes from a high (80ºC) process at a relatively low viscosity (1.38cP). It is cooled down by water to about 40ºC, where the viscosity increases to about 7.33cP. The problem is that, as the viscosity increases the differential...
  3. Unotec

    What is fire?

    I had my 5 year old asking me if fire is solid, liquid or gas.... I couldn't answer. What would your answer have been? <<A good friend will bail you out of jail, but a true friend will be sitting beside you saying ” Damn that was fun!” - Unknown>>
  4. Unotec

    Senior vs ego

    I am on the job hunt, as many of us are. Some of my acquaintances have pointed me toward "senior this or that" positions. I have been trudging this field for over ten years but I do not consider myself a senior. Is my youthful ego getting on the way and I should start considering myself as a...
  5. Unotec

    Why Gold? It's useless!!

    Didn't know where to start this useless rant but here it goes (and probably explains why I'm an engineer and not a financial guy). We, engineers, build stuff, value things that are useful and don't mind paying a little extra for something that will outperform cheaper things. Now, with this...
  6. Unotec

    ISA S18.02 Standard

    Has anybody heard of this standard? http://www.isa.org/InTechTemplate.cfm?Section=article_index1&template=/ContentManagement/ContentDisplay.cfm&ContentID=58395 I have been trying to come up with an alarm guideline for the facilities we have. In my mind, our processes are very simple and easy...
  7. Unotec

    ABS vacuum rating

    I need to find out the pressure ratings for ABS piping. I tried the ABS web page and no luck. Googled it and no luck either. Basically, I have 3", sched40 ABS piping for a vacuum application. I need to know how much vacuum this pipe can handle. Full vacuum maybe? Does anyone know where I...
  8. Unotec

    Small mobile hydrotreater

    I am looking for a small, preferably mobile hydrotreater. The goal is to evaluate the catalyst life and viability of the process to decide whether we build the process into our plants or not. Does anyone know of a company that has mobile units? <<A good friend will bail you out of jail, but a...
  9. Unotec

    Climate Change Challenge!! $$$

    I'm sure you've seen it or will pretty soon! http://www.ft.com/indepth/climatechallenge And here we go again. I wonder if they'll give me the money if I give them the best solution: "If you don't want climate to change, put it in a beaker with a controlled temperature water bath and monitor...
  10. Unotec

    Scares - Taking science out of proportion

    Just finished "Scared to Death" and I had quite an experience. Needless to say that I will not see all the alarms and warnings in TV, radio, etc... under the same light I used to any more. Short from verifying all the quotes, links and references, I think what is explained and detailed makes...
  11. Unotec

    HCl tank pressure relief vents

    I have an HCl application (37%) where we use a 750bbl tank. I need to install a thief hatch (8") and a fire hatch (20"). The challenge is that all PVTH's and EPR's I find are either carbon steel, aluminum or 316SS. Neither is acid resistant. (ambient conditions are +30ºC to -20ºC) Does anybody...
  12. Unotec

    Increasing deep well disposal rates

    Good day, We have two water disposal wells connected to a single plunger pump. Currently we are injecting at 1300#, 25m3/day, the max operating pressure of the wells is 1600#. In the past we had two pumps injecting separately and a total disposal of 35 m3/day. One pump got busted and that is...
  13. Unotec

    Downhole temperature rule of thumb

    Is there a rule of thumb to estimate downhole temperatures? say, xxxºC/m? I know that some formations might present higher than normal/expected temperatures due to geological factors, but under normal conditions. Does such a rule of thumb exist?
  14. Unotec

    Too many safety concerns?

    I am an immigrant in a so-called developed country. I am impressed at the EH&S stuff. More in particular, SAFETY. I know that common sense and knowledge are not as common as they should be, but some of the safety precautions seem just plain ridiculous. I am not saying safety should not play a...
  15. Unotec

    Basket strainer as pressure vessel

    I have been trying to talk to ABSA (in Alberta) regarding filer pots aka basket strainers and whether they are regulated as pressure vessels or not. If they require scheduled testing etc... Unfortunately I have not been lucky enough to get a clear answer. Typically they are installed in the...
  16. Unotec

    Silica removal from water

    During the SAGD operations, steam is injected into a bituminous sandy formation. This steam contains caustic soda to promote flow and preserves the formation integrity, amongst other things. Therefore it is unavoidable. The blow down water from the boilers end result is something very similar to...
  17. Unotec

    Pump jack water/oil production

    Good day, I have two wells (small producers) in the exact same zone, just a few kms apart. The oldest one (by 2yrs) is producing 95% water @ 10.5 strokes per minute. The youngest one about 18% water @ 3.5 strokes per minute. Do I run the risk of affecting the production of the oldest one if I...
  18. Unotec

    Nozzles slip-on vs RFWN

    While designing tanks we always specify raised face welded neck (RFWN) type. However, one of the manufacturers suggested using slip on type, as they are less expensive. The mechanical stresses the nozzles are subject to are not considerable. In any event, the welding for the slip-on type should...
  19. Unotec

    Types of ball valves

    Good day, What types of ball valves are there? Every project we do, we leave up to the mechanical contractor to supply the valves. All we tell him is to use ball valves (service is oil, water, emulsions). Unfortunately this has lead to poor quality valves that seize up quite often requiring...
  20. Unotec

    Dirty Natural Gas as fuel

    I am planning to change the fuel supply for a treater from propane to natural gas. The plant borders with a booster gas plant for produced natural gas. Obviously this gas is "dirty". Contains water and solids. What would be an effective way to cost-effectively clean this gas stream?

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