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  1. Jens12

    ASTM 285 Gr.C vs. A36

    Hi, our tank manufacturer wants to change the tank material from specified ASTM 285 Gr.C to ASTM A36. The affected storage tanks are atmospheric and on the one hand for PHC sludge covered by API 650, diameter from 2000 to 5500 mm and on the other hand water tanks covered by AWWA D100 from 5500...
  2. Jens12

    design of nitrogen storage tanks

    a 12 m3 nominal capacity (liquid N2) tank.
  3. Jens12

    design of nitrogen storage tanks

    Hello, I have to do a cost estimation for N2 storage tanks and have long expirience in the calculation of pressure vessels. Unfortunately I don't have a clue of the design of N2 storage tank. Are there any internals or is it just a vessel like a Compressed Air Tank (I'm aware of the low temp...
  4. Jens12

    316 SS with Chlorides up to 10.000 ppm

    Hi guys, thanks for all your interesting comments. As this is obviously really a tricky problem I have now almost as much different opinions as people are involved. Our Contractor is now proposing to use just Carbon Steel in order to avoid pitting/CSCC assuming that Corrosion on CS will be...
  5. Jens12

    316 SS with Chlorides up to 10.000 ppm

    Hi Metalguy, I assume you disagree with the proposal ...
  6. Jens12

    316 SS with Chlorides up to 10.000 ppm

    Hello, our Contractor recommends 316 SS Agitator shafts & impellers for the use of agitating PHC Sludge in big storage tanks (Ø5000) at a temperature up to 115°C and a Chloride value up to 10.000 ppm ! The tanks are made of CS with painting. I have big concerns of using 316 SS in such an...
  7. Jens12

    design&test pressure of nitrogen evaporator

    I'm a mechanical engineer and have to check data sheets for a nitrogen evaporator. The operating pressure of the nitrogen system itself is about 5 barg, the max. op. pressure of the evaporator is indicated with 35.1 barg and the test pressure is 38.61 barg. Why is the max. op. pressure so high...
  8. Jens12

    CPVC/PVC in outdoor desert environment

    Hi, one of our supplier wants to install a CPVC piping for a sewage treatment unit located in the desert of Ruwais/UAE. The location is only shaded by a sunshade roof without walls and the unit will be exposed to high UV radiation. In my opinion CPVC is not dedicated for long-term (20 years)...
  9. Jens12

    ASME Code VIII vs. API 650/620

    I'm working on a project for a oil refining company and the Project Management Consultant did a basic engineering and produced some equipment data sheets for tanks which store recovered oil and some kind of liquid organic waste and so on. As design code ASME Code VIII was specified. Now the...
  10. Jens12

    steam-out nozzle

    Please can somebody me explain what a "steam-out nozzle" is ? Is it the inlet of the steam or is it an outlet ? The question came up during checking a vessel data sheet with heating coils.

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