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  1. essenwood

    Diluted Sulfuric acid

    Hi all, It is commonly known that diluted sulfuric acid is very corrosive. What is actually the mechanism behind it? Thanks,
  2. essenwood

    Fire Safe SDV

    Hi all, This site has been remarkable. All of you out there helping others are just wonderful people. Help me with this one; can't seem to find the relevant codes/standards. For LPG storage areas, the SDVs are typically specED as fire safe valves. Would there be a requirement for for...
  3. essenwood

    Pipe discharge configuration

    Hi guys, I always see that the drain valve on a pump discharge is between the NRV/check valve and the downstream block valve (NRV, drain valve, block valve). Is there a particular reason why the arrangement is like that? I.e. can I have instead the drain valve up stream of the NRV? (drain...
  4. essenwood

    model review

    Hi all, Can I get some additional info on what to look for during a model review in the Detailed Engineering Design phase of a new plant. What I had done before was matching the 'for construction' P&ID with the model, checking for piping and equipment layout, accesibility of valves, height of...
  5. essenwood

    Heat Index

    Hi all, in a lot of places stop work order required when the heat index is bigger than 50 deg C. Well, the apparent 50 deg C temperature depends on the air temperature and humidity obviously. I was asking myself; why 50?not 45, 55?...anyone got a clue? Thanks.
  6. essenwood

    SPM SBM

    Hi all, Does SBM (Single Buoy Mooring) and SPM (Single Point Mooring) mean the same? I see both terms being used all the time. Coincidently, SBM is also the name of the company (SBM Offshore N.V.) which is the pioneer in SPM systems. Thanks in advanced.
  7. essenwood

    Floating roof rim seal

    Hi everyone, Petroleum tank rim seal fires attributed to lightning are known to happen, fortunately, the statistics are rare. Key strategy for preventing fire is to properly bond the roof and wall of the FRT via shunt, walkway ladder, cable. Reasons such 1)seals become worn, cracked and/or...
  8. essenwood

    MDEA Foaming

    Dear all, Much has been said in this forum on the subject and much has been discussed also at NPRA conventions. It has also been said by some that amine foaming tendencies in refineries are more in the cracking service (coker/FCC) section than the non cracking service (gas plant ex CDU). I...
  9. essenwood

    Ship loading temperature

    Hi all, Had this debate with my oil movements and ship people. Why is it that most petroleum product ships (eg fuel oil) dictate that they can only receive the product at max around 160 deg F to 170 deg F (the rest of the world around 70 - 75 deg C). I can understand the minimum temp but the max...
  10. essenwood

    Dry point problem

    Hi guys, I was reading one of the old report in the refinery; which indicated that coker naphtha feed had contributed to the fouling of the feed/effluent Heat Exchanger of the Naphtha Hydrotrating unit. The report mentioned that the poor heat transfer has increased the fuel gas consumption at...
  11. essenwood

    Can H2S be destroyed in the firebox?

    Hi all, We have a DOE spec of <5 ppmv of H2S from our furnace stacks. Typical Fuel gas composition contains about 100 ppmv H2S ex the amine scrubbers. Recently we have problems in one of our process units and the this producer of Fuel gas is sending about 3000 ppm of H2S (after their amine...
  12. essenwood

    Ground level flare

    Hi there, The refinery that I am working in is surrounded by communities (due to historical reasons) and we are always in the firing line when we have a &quot;big&quot; flaring incident. And of course &quot;big&quot; depends on how educated the authorities and residents are. Can I know from any...
  13. essenwood

    Centrifugal Compressor Curves Correction

    Hi all, Hope someone can help me... I extracted this from a centrifugal compressor book while trying to find out how to do corrections to performance maps of centrifugal compressors. &quot;The performance map for a centrifugal compressor typically supplied by the vendor would be either...
  14. essenwood

    Compressor head curve

    Hi all, This is my first posting, please bear with me, tx. I am a process engineer and has this question on the manufacturer supplied performance curve. The curve that is supplied is based on a set of base conditions such as suction pressure, temp, specific gravity (Molecular weight) of gas...

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