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  1. jeap

    Allowable Dimensions for Flush Type Cleanout under API 650

    Thanks JStephen, The fact is that the tank, by specification, shall be constructed under API 650. Thus, in order to avoid further observations I'm changing to a 36 x36" connection. Thanks again.
  2. jeap

    Allowable Dimensions for Flush Type Cleanout under API 650

    Hi all! This is a simple question: A flush type cleanout connection with the next dimensions: Width: 24" Height: 36" can be allowed by API 650? That set of dimensions are not in the tables of the standard. However, standard 650 in paragraph 3.7.7.1 states that: '....When a size...
  3. jeap

    FLARING GAS RECYCLE SYSTEM

    HI ALL! We are about to design a flaring gas recycling system for a LPG plant. It will include a low suction pressure compressor attached to the flare header downstream KOD and upstream the flare. Also, a water seal liquid is going to be installed before flare in order to avoid backflow at very...
  4. jeap

    Check Valve on Minimum Flow Line

    dcasto, please look the diagram: http://i3.uploadem.com/10042007/pagina.jpg It is possible under the conditions I show you... Need to know a scheme of the ghamsa case.
  5. jeap

    Check Valve on Minimum Flow Line

    Hi ghamsa, First of all, a question: Assuming that each of your pumps has a check valve and a shut off valve (as most of the systems have). The recycle line starts upstream or downstream of this check valve? If it starts downstream of the pump check valve I consider it is not necessary to...
  6. jeap

    Vent system design

    Dear sgoel: From my knowledge you should have an additional line for venting the air in a convenient way. As you explained, drying is a different operation than filtering. This new line could have an automatic valve that opens when your system is in the drying process. Considering that such a...
  7. jeap

    Verifying thickness of a pressure vessel

    Results for circumferential stress from using: MAWP = 1126 psi (110% Pop) t=PR/(SE+0.4P) (Based on external radius) t= 1.155 inch, which is greater than actual w/o using corrosion allowance, that's the problem. For ellipsoidal cup: t=1.07 inch, which is closer but w/o corrosion... If...
  8. jeap

    Verifying thickness of a pressure vessel

    Sorry I forgot to mention: thickness for pipe = 1 inch. thickness for cup = 1 inch. It is possible justify this vessel by using maximum stress values other than recommended by standards? thanks
  9. jeap

    Verifying thickness of a pressure vessel

    Hi all! I'm in a big hurry trying to verify if a vessel could be adequated for a new service. The problem is as follows: 1.- The vessel is 36 in OD 10 feet high, pipe A-106 Gr. B. 2.-Bottom ellipsoidal 2:1 cap A-516 Gr. 70. 3.- Top Flange B.16 600#. and should be used in the following...
  10. jeap

    Demister in a KO vessel upstream of incinerator, critical?

    Hello, Since a KOD is usually designed to separate a certain size of liquid droplets (vg 300-500 micron), besides slugs of liquid, I found redundat to install a demister. Also, if the gas stream is expected to be dirty then demister can be plugged causing a great undesirable pressure drop...
  11. jeap

    How big can a FRP HCl (36%) storage tank be built?

    Hello, I've seen FRP tanks up to 80 m3 for sodium hypochlorite (3.5m diam, 8m height) , and in the same plant we had a 30 m3 32%HCl. In other plants I've seen a group of several tanks in storage area for 32%HCl, capacity up to 20m3 each. My be this is the most common case I've seen. But you...
  12. jeap

    Liquid ring pump sizing

    Dear all, I forgot to mention that I considered a water temperature of 5ºC as the worst condition for the system. Well, I downloaded Mr. Montemayor's spreadsheet, it is really useful. For the system configuration I obtained an "air seepage" of 1.5 Kg/h which is within the overdesign I assumed...
  13. jeap

    Liquid ring pump sizing

    Hi All! I have designed a system for deareating 170 m3/h of river water from 13 to 0.7 ppm of oxygen. This system consists of a deoxygenation tower (Operating pressure 70 mbara) and a liquid ring pump. I've found that it is necessary to extract abt 6 Kg/h of gas/vapor from the water stream to...
  14. jeap

    Valve closed for vapor but open for liquid.

    weeber (Civil/Environme), Install an overflow leg, which is an inverted "U" atacched to the bottom of your tank, and on the other side attached to the secoundary containment. It is a common solution to overflow problems like yours. The height of this leg should be calculated to evacuate stinky...
  15. jeap

    Floating device for skimmer tank

    Hi Lblopez, Try this link: http://www.flotrend.com/flipflop.html I do not recommend a floating skimmer device because the articulated pipe tends to clog o plugging frecuently in a dirty medium (brine is not clean water); so it is not a reliable device. From my point of view, it is better to...
  16. jeap

    Pressure of stream to a tank

    Pipehead, Sorry, but I completely disagree with the concepts you wrote in the last paragraph. What do you mean with infinite pressure?
  17. jeap

    Pressure of stream to a tank

    "Assume we have a tank with 5 meter water in it(atmospheric tank). The minimum pressure of an stream to get into the tank is (roughly) 50 KPag. What is the MAXUMUM allowable pressure of such stream? Can we send an stream with pressure of (eg)1000 KPag into it? Thanks for your responses," May...
  18. jeap

    Restriction orifice under special conditions

    I understand you are looking for a time to discharge the reactor (not specifically depressuring). Let me tell you that an accurate calculation of the orifice diameter under those conditions is not possible, due to flashing conditions at vena contracta. From my point of view, you should use the...
  19. jeap

    Vacuum deoxygen column design

    Hi all! I'm trying to dimension a vacuum deoxygen column to pretreat 170 m3/h of river water to be injected in an oilfield. The oxygen and other dissolved gases are removed from water by means of vacuum generated with a liquid ring pump. The process is carried out at 25ºC and 35 mmHg (abs)...
  20. jeap

    Vapour in LPG line

    hi! What reena stated is ok, but also avoid to vent to atm (to tank is ok) in the first step, or try to do it slowly. May be this sudden depressing is causing lpg in suction line to flash until the line is cooled down and it stops, but vapour pockets remain present in the line. Line size (l...

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