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  1. C4Reactor

    Checks for leaking reboiler

    I need all the help I can get here. There is a sudden increase in water in our distillation operation. We checked for Cooling Water chemicals in the process (Cloride) for prossible ingress from the CW condenser but found none. This suggest that the water may be ingressed from the steam reboiler...
  2. C4Reactor

    Rupture disc setup

    All, I am putting in a RD to protect a PD pump. The RD is installed at the discharge line and routed back to the suction line. In case of overpressure, flow will be diverted back to the suction side. My question is, how to decontaminated this line for maintenance (case: RD does not burst but...
  3. C4Reactor

    Disposal of refinery slops / sludge

    Some cement kiln operator, knowing how advantageous this is to the refinery will instead charge the refiner for every tons of they send in!
  4. C4Reactor

    PSV for Positive Displacement pump

    All, I need you opinion on this one. I'm HAZOPing a PD pump set-up. For the pump block-in condition (discharge valve close), is it sufficient to depend on the pump's internal relief valve or must we install a PSV upstream of the discharge valve with its outlet being recirculated into the suction...
  5. C4Reactor

    Spec Break

    Thank you all for being all the comments. Its has been very helpful.
  6. C4Reactor

    Spec Break

    All, In designing a piping system with variable pressure rating, what is the consideration when specifying the piping spec break? Must there be a valve at every spec break? Is there any code on this? Thanks
  7. C4Reactor

    Pipe flushing/blowing for pre-commissioning

    Ommuruga, You need to be more specific on the system to be commissionned. Different system have different requirement. Cryogenic system require moisture freeing. This is achived by purging the system with nitrogen until the dew point reading at the outlet points are the same as in the nitrogen...
  8. C4Reactor

    Work Permit during Turnaround

    One of the major concern for Turnaround scheduling is the late issuance of Work Permit. Someday, esp during the beginning of the Turnaround, some work can only begin after 10:00 in the AM (Normal shift started at 7:00 AM). One way suggested is to lengthen the validity of selected non critical...
  9. C4Reactor

    Running distillation column with missing trays

    Thanks for the response so far. The damaged trays are located at the bottom. All three bottom-most tray of the Stripping section. The reason it is made of exotic material is due to the high corrosivity of the process fluid at that high temperature. The most likely reason for the damage is like...
  10. C4Reactor

    Running distillation column with missing trays

    Dear all, I am having a shutdown maintenance. Just open a distillation column and found three trays are damaged. Due to the exotic material, we only have one tray for replacement. To order new will take months. The total number of trays in the column is 50. If we run the column with two missing...
  11. C4Reactor

    Steam control to reboiler

    Dear all, There are two types of steam flow control into a thermosyphon reboiler. One is by having the control valve at the steam inlet line and the other is controlling the exchanger condensate outlet flow. Based on your experience, which one is more realiable and robust? Appreciate any comments
  12. C4Reactor

    Pump capacity check

    Dear all, Is there any step-by-step method for checking pump capacity? I am looking into increasing a flow across a system. The volumetric flow is o.k with the pump but the density has increased. How do I translate this change into the pump curve? Appreciate any ideas
  13. C4Reactor

    Flow profile in the tube side of heat exchanger

    Experiencing fouling at the tube side (Cooling Water) of a heat exchanger. The HX is of straight tubes with a longitudal baffle at the channel cover to allow for two passes design (TEMA type: BEP). Cooling water enters thru the bottom nozzle of the channel cover, flow thru the tubes and return...
  14. C4Reactor

    Flow profile in a heat exchanger tube

    Experiencing fouling at the tube side (Cooling Water) of a heat exchanger. The HX is of straight tubes with a longitudal baffle at the channel cover to allow for two passes design (TEMA type: BEP). Cooling water enters thru the bottom nozzle of the channel cover, flow thru the tubes and return...
  15. C4Reactor

    Noise at flare stack

    Whenever there's hydrocarbon vapor release from our flare stack, the atomizing steam valve will be opened to ensure complete combustion therefore reduce black smoke formation. One persistent problem: with the steam discharge, come a defeaning noise (at 110 dBA monitored at grade level). Happy to...
  16. C4Reactor

    Steam blowing

    Further question to the group. I'm planning to do a steam blowing. Two set-up are being proposed: 1. To locate the sacrifical valve at the upstream side of the new steam piping, close to the steam source. Steam flow can be monitored from the supply header. Sacrifical valve is opened until...
  17. C4Reactor

    Level measurement of Sulphuric acid tank

    Hi Zaheer, Try radar level sensor. We are using it for corrosive service. Great stuff.
  18. C4Reactor

    Absorption Chiller troubleshooting

    As we have two chiller units (one standby), my options are: A. Run the chiller in series or, B. Run the chiller in parallel or, C. Install a rental unit downstream of the exisitng. Option A requires extensive piping modification, Option B may cause insufficient flow (i.e. laminar) thru the...
  19. C4Reactor

    Absorption Chiller troubleshooting

    My update based on the above replies: -The vacuum pump is working well. It gives the negative pressure as per design specification. -The chiller is very sensitive towards CW temperature. Even if the temp increases by 1 degC, we will lose the Solution level in the evaporation drums. -Temperature...
  20. C4Reactor

    Heat exchanger tube vibration

    What is the best way to determine the vibration of tubes in a shell and tube exchanger. Is just monitoring vibration on the shell external wall gives a valid data? What is the normal vibration figure and the max allowable. If you guys have any experience in this, appreciate any sharing of ideas...

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