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  • Users: Razif
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  1. Razif

    Backflow protection for mercaptan injection into LPG header

    Thanks for the responses. The observation of a sweating mercaptan vessel came only once, and its hard to verify as it was observed in the wee morning hours of the night shift. Only one operator observed this and made the report. Based on design guidelines that we have in house, having two...
  2. Razif

    Backflow protection for mercaptan injection into LPG header

    Hi, I wish to check if there was sufficient backflow protection in the mercaptan injection facilities to a LPG header. Diaphragm pumps are used for the service and each line has 2 dissimilar NRVs at present. The reason I am reviewing this is that there was an incident where an operations staff...
  3. Razif

    Unexplained Damage on Floating Roof

    Thanks MJC, I've done that today. RR RR
  4. Razif

    Unexplained Damage on Floating Roof

    Hi, We have three 73000 MT floating roof crude oil tanks at site. About 2 months ago, the polyflow tubes along the roof guard plates failed, but no fire was detected. The tank dip is taken by an independant surveyor, so our own staff rarely go up on the roof, except on this ocassion to...
  5. Razif

    Conversion between Nm3/hr to Sm3/hr and vice versa

    chemprocess, The importance of the defining T & P values are very important. I had one experience where there was a dispute on the amount of hydrogen exported to another plant from one plant in an integrated petrochemical complex. It turns out that one plant was designed by a European company...
  6. Razif

    Estimating the loss of steam via passing valves

    Thanks once again for all your ideas. I will check to see if the steam trap supplier is able to do a steam trap audit, kdt. It would be great if they can. khan101, there isn't a flowmeter installed, and there currently is'nt an ultrasonic flowmeter available in-house, but I'll keep in mind...
  7. Razif

    Estimating the loss of steam via passing valves

    I have one more query........ Is it even possible to replace the steam trap bypass valves on the run? There is no way of isolating the steam to the traps in question without isolating the steam header it serves, and isolation of the header is not a possible option. FYI, the steam header is used...
  8. Razif

    Estimating the loss of steam via passing valves

    Hi, Thank you for all your replies. I agree that good housekeeping is mandatory. However, I need to put together some concrete figures to convince management that the outstanding 'little' jobs go a long way in saving us energy. Thanks for the link 25362, its very helpful. RR
  9. Razif

    Estimating the loss of steam via passing valves

    Hi, I am trying to come up with an estimate for the steam losses in my plant through the numerous passing steam trap bypass valves and some leaking (corroded)steam tracing lines. Is there a quick formula that can be used based on the pressure of steam, the size of the opening/hole/bypass line...
  10. Razif

    Simulating an Ammonia Converter on HYSYS

    Has anyone tried using the ammonia reaction available in the HYSYS library? I was wondering how accurate it is for a HTAS 200 series 2 radial bed converter. Any tweaks that make the simulation better? For one, I have trouble esitmating the split of flow between the inlet and the quench of the...
  11. Razif

    Lining for Sodium Hypochlorite Tank

    Just to get a feel of what is being used out there, which is more common for this purpose: rubber lined tanks or PTFE lined tanks? The solution is of 11% concentration when freshly delivered. We have occasional plugging of the dosing lines with a black substance which we suspect is the rubber...
  12. Razif

    Foaming in BASF AMDEA CO2 removal system

    Thanks for your prompt reply, TBARBill. To answer your first question, the ambient temperature is fairly constant at about 30°C, being a tropical country (Malaysia). It might get only slightly cooler in the night and during the monsoon seasons, but not by a whole lot. Our plant has only been...
  13. Razif

    Air Leak or Steam Leak Survey

    How does one go about estimating the losses of steam through leaking/passing start up drain valves and steam traps if there are no available characteristics for the manual gate valves? Anybody have typical characteristics for the gate valves of 3/4" in size? How too do we estimate the...
  14. Razif

    Foaming in BASF AMDEA CO2 removal system

    Dear all, I was wondering if anyone has experienced similar trouble with foaming in their CO2 removal unit. We are having to add a substantial amount of antifoam every shift to combat the problem. We have opted to install an activated carbon sidestream filter to remove hydrocarbons from system...

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