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  1. seuenergy

    Zone classification for sewage storage and packing system

    Hi Shvet, The room is equipped with HVAC system, and continuously ventilated at 6 air changes per hour.
  2. seuenergy

    Zone classification for sewage storage and packing system

    Hi Shvet, Thanks for your explanation. These information is important. I am not leading the work, but try to learn something during the work.
  3. seuenergy

    Zone classification for sewage storage and packing system

    Yes, you are right. It is sludge. These organic sludge is from aeration tank. The information from designer is that these organic sludge could generate H2S, and that is why they calssify the zone as zone2. The room is equipped with H2S detector as well as LEL detector. I am not from the unit...
  4. seuenergy

    Zone classification for sewage storage and packing system

    Hi Pierreick, Thanks for reminding. We have gas detect monitoring system for these detectors. What I concern is that whether this room should be classifed as zone 2 or not.
  5. seuenergy

    Zone classification for sewage storage and packing system

    Hi Pierreick, Yes, Continuous monitoring by two H2S detectors inside the house.
  6. seuenergy

    Zone classification for sewage storage and packing system

    Hi Shvet, Thanks for your comments. 1/ Descrbe the sewage. Describe the house. A: The sewage is from waste water treatment unit. The water concentration is around 80%. The house is well enclosed with HVAC. 2/ What about underground sewer system and pump station - is it designed Ex-proof or not...
  7. seuenergy

    Zone classification for sewage storage and packing system

    Hi all, We have one storage house for sewage. The design engineer want to classify the house as zone2 as there might be slight H2S generated by sewage. As the house is equiped with forced ventilation( not sure if the ventilation rate reaches 6 times per hour), I can not argue with this zone 2...
  8. seuenergy

    String Testing of a Lube Oil System

    hi, Could you provide the P&ID of the lube oil system? Currently, I could not get your senior's point. Is he talking about the filling conditions of the inlet pipeline of stand-by pump is different for long term shut down and short term shut down?
  9. seuenergy

    NPSH and maximum vaccum of the pump

    one picture may help you to understand. this one is mannual priming vessel. The pump is one normal centrifuge pump. When priming liquid is pump out, then little vacuum would be created. Then the water inside underground pit will be pushed by ambient pressure. For self-priming pump, please...
  10. seuenergy

    Optimal Steam Pressure for Jacket

    Hi, This one is big MOC. For process, you need to evaluate the risk of higher temperature. For example, decomposition, reaction tiem .eg. For equipment, you need to evaluate the risk of reactor, related pipelines... I think higher temperature would improve yield by reducing batch time, but...
  11. seuenergy

    IBC Mixer / Drum Mixer - Electric or pneumatic

    For economic evaluation, it should base on your plant's utility conditons. One concern from my side is safety. if the materail is flammable, please take care of explosion prevention. It is better to do mixing in proper designed vessel not in IBC.
  12. seuenergy

    NPSH and maximum vaccum of the pump

    first impression is that there are two opitions for underground pit pump. option 1: self priming pump option 2: manual priming before start pump detials please see the link: https://chemicaltweak.com/pump-priming-in-detail/
  13. seuenergy

    Deaerator Usage In Power Plants

    Deaerator is used for removing O2 in feedwater to avoid corrosion inside boiler. Then if deaerator is not used, there must be another way to remove O2. You need to know the whole picture of the design concept.
  14. seuenergy

    How to dump to 50% of vessel's design pressure

    Thanks Shvet, I finally got your point. That is depressurizing system not PSV.
  15. seuenergy

    How to dump to 50% of vessel's design pressure

    Hi Shvet, Thanks for your reply. My confusion is that if the set pressure of PSV is only little than design pressure. Like 95% of design pressure. How can we get 50% of design pressure when dumping. Thanks!
  16. seuenergy

    How to dump to 50% of vessel's design pressure

    Hi all, In API 521, section 4.6.6 states:" For pool fire exposure, this generally involves reducing the equipment pressure from initial conditions to a level equivalent to 50% of the vessel's design pressure within approximately 15 min." I am wondering how we could get 50% of design pressure...
  17. seuenergy

    Does dry gas PSV always need drainage on discharge pipe ?

    This topic remimder me of one leason learnt from EPSC.
  18. seuenergy

    Design Pressure due to Deflagration

    hi, sorry for my poor memory. API 521 suggests the minimum design pressure of knockout drum should be 0.345MPa. My thinking is that the flare stack should be not less than this value.
  19. seuenergy

    Design Pressure due to Deflagration

    Normally, the rate of pressure increase rise of hydrocarbon is roughly 7~8 times of deflagration, and 12~13 times for H2. So if the operating pressure of flare system is 0.5bar, so 0.5* 8 = 4 bar. Then 7 bar design pressure is reasonable. There is also code from API, it has recommended valve. If...
  20. seuenergy

    Backup fuel for pilot

    Hi all, Does the flare system's pilot light in a petrochemical facility require a backup fuel supply? Is there any code requirement？ Thanks!

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