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Recent content by essenwood

  1. essenwood

    Diluted Sulfuric acid

    Guys, Thanks for the replies. Diluted sulfuric acid is more corrosive than concentrated sulfuric acid (70-99%). Below is extract from numerous writings on the matter: <<<"Almost every process plant, power plant and water treatment plant has one or more concentrated (70% to 99.5%) sulfuric acid...
  2. 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,
  3. 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...
  4. essenwood

    Pipe discharge configuration

    Dear all, Thanks for your replies. I was thinking that the dead end section can be drained through the pump casing by way of a bypass line around the NRV.
  5. 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...
  6. essenwood

    model review

    Guys, Thanks a million. You've been great. Regards.
  7. 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...
  8. 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.
  9. essenwood

    SPM SBM

    Thanks BigInch..your explanation makes a lot of sense.
  10. 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.
  11. 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...
  12. 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...
  13. essenwood

    Ship loading temperature

    Guys, I will indeed post the clarification when I get them. Will talk to the Captain soon. We tried once to have the product temp raised from 70 deg C, and the Captain waivered the requirement to 75 deg C. I thought I did some homework first before asking the Captain how he got to the 75 deg C...
  14. 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...
  15. essenwood

    Dry point problem

    25362: Your explanation was much appreciated. Just to confirm some more details: Can I control the problem by shifting as much possible the dry point outside of the heater tubes? i.e. clearing up the fouling of the feed/effluent HEX?; such that the vaporization happens there. The tube side...
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