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  1. nsbreddy

    Hydrotest after field PWHT

    Hi, I have come across a case where we have a wet sour vessel field Heat treated (PWHT), originally not heat treated. Due to certain process conditions it was decided that the whole vessel shall undergo field PWHT. Reactor is made of carbon steel and built approx. 30+ years back. All other...
  2. nsbreddy

    Floating roof vs Fixed cone roof

    Thanks Littleinch, by the way what is chine roof? And economically, constructing a floating roof tank is cheaper or fixed roof?
  3. nsbreddy

    Floating roof vs Fixed cone roof

    Our client is asking us to consider a floating roof instead of a fixed cone roof. I want some expert opinion on the forum what are the main factors to keep in mind for selecting a floating roof especially when the tank is for a cold temperature country like Kazakhsthan. Tank service is oil tank.
  4. nsbreddy

    Tanks internal chem resistant lining Devchem 253 Versus Devchem 100

    We have ~10 tanks to be coated with Devchem 253 as chemical resistant lining. Vendor has proposed alternate Devchem 100 as a replacement to save time. I know for definite that Devchem 253 works but not sure of Devchem 100. Is there anyone who has used in the past this product as replacement to...
  5. nsbreddy

    Wind Load Calculation - Vertical vessel with No Skirt

    Perfect answer from gr2vessels. I would calculate the equivalent pressure and apply as external presure in the software (i am a compress user). Software is a tool and you should simulate the load condition to get the desired results....
  6. nsbreddy

    Non-Sparking thief hatch

    Thanks Duwe6, Useful info.
  7. nsbreddy

    Non-Sparking thief hatch

    may be a silly question, but wanna know it right! Can someone through some light on when to use non-sparking thief hatch and when to use self-closing thief hatches.
  8. nsbreddy

    Impact test requirement of API 650 tank

    As I understand, impact test requirements for materials are governed by fig 4-1a unless purchaser has specified the impact test for all thicknesses. I am using group III materials for my tank design. With MDMT -29 C the maximum thickness I can use without impact test is ~21mm. Is there any other...
  9. nsbreddy

    Blast load design

    MJCronin, tanks are located onshore. The discussion on type of blast is still under discussion with our client. IFRs, thanks for the info. I have used similar approach on columns. Basically I wanted to know if blast load is common to apply for tanks in the industry.
  10. nsbreddy

    Blast load design

    Has anyone come across blast pressure design for API tanks? If there are any reference materials will help.

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