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Recent content by Technopriest

  1. Technopriest

    ASTM A234 WP9 Cl.1 vs Cl.3

    Please, I need help in understanding some points of ASTM material specifications. On ASTM A234, several materials are listed including WP9 Cl.1 and WP Cl.3. Cl.3 has better strength (both UTS and Yeld). On ASME B31.3 (2012) and ASME II part.D (2004) ASTM A234 is listed but Class/condition is...
  2. Technopriest

    Protective coating for carbon steel

    I apologize for the lack of information. I'll try to explain a little more. We have an inlet foul air comprehensive of a 3 mg/Nm³ of dichloromethane. This foul air goes to the burner, where it is mixed with another inlet of concentrated solvents (to date, unknown chemical composition). A...
  3. Technopriest

    Protective coating for carbon steel

    Greetings. We are due to produce a thermal oxidizer treating air with a 3,33g/Nm³ concentration of CH2CL2. After the burner, there will be steamm addition; our customer fears that when the air temperature drops in the range 60-150°C chloridric acid might concentrate. Our proposed solution is...
  4. Technopriest

    High-temperature resistant paint coat

    Thanks a lot to you all. I must admit that the product proposed by gvanbeek seems the best to me. I will ask for an economic offer to the supplier.. gray is, in addition, our first choice of colour; I hope the price is not too high.. Again, thanks. Che Dio ce la mandi buona, o almeno ce la...
  5. Technopriest

    High-temperature resistant paint coat

    Greetings. I have the request to paint a deodorative, cylindrical thermal oxidizer. Wall material is iron, surface temperature is extimated to rise up to 200°C. Our standard paint cannot withstand temperatures higher than 150°C; we have an (ugly to see) inorganic zinc paint-coating that can...
  6. Technopriest

    Tallow (animal grease) pump

    Greetings. My company is going to employ a mono-screw pump to get tallow (animal grease) at about 50°C from a subterranean tank (3 meters below pump level) about 12 meters away from the pump room. Our supplier (Seepex) states that this is possible, and I can believe it. But, we are going to need...
  7. Technopriest

    Maximum external pressure

    Prex, the data I have refers to allowable stresses for 0,2% yield value. For 1% yield value (material X2CrNiMo 17.12.2 EN10028, thikness up to 12mm) I read 136+ MPa (all data refers to 150°C temperature). I repeat this data applies to VSR code; I have not used EN13445 since I have not a...
  8. Technopriest

    Maximum external pressure

    With the latest update to VSR, maximum allowable stress for ASTM A240 TP316L at 150°C temperature is ~109,5 MPa, so it's within the limits for the 10mm thickness case. I still think there is some problem, because even with the EN13445 calculations that prex just provided the external pressures...
  9. Technopriest

    Maximum external pressure

    I have a design length of approx. 550 mm. The design temperature is 150 °C. The material required is ASME SA240 TP316L. I'm trying to design the vessel as a jacketed one, coils are not allowed. The design length can be reduced (up to 300mm) dividing the jacket in three pieces. Using VSR code...
  10. Technopriest

    Maximum external pressure

    I was comparing the maximum allowable external pressures for a cylinder calculated with italian VSR design code and with ASME ed. 01 add. 02. The result was amazing: with a 2500 mm Do, and t=10, VSR allows about 0,8 MPa external pressure (The vessel is a jacketed one, with 0,7 MPa in the jacket...
  11. Technopriest

    ATEX certified dryer

    The dryer is a pressure vessel; inside the vessel the process takes place (in this case, the drying of the product). We believe that if the customer ask for a zone 0, the product that will be processed inside the dryer will generate a potentially explosive atmosphere (and it's surely possible)...
  12. Technopriest

    Nozzles location

    Many thanks MJCronin. I read the thread and I learned a lot about ASME code. I must admit I have a lot of problems on ASME code; both because I'm a young engineer and because I am italian (and we use VSR code, which is far more rigid). I believe ASME Code is really not user friendly; there are...
  13. Technopriest

    ATEX certified dryer

    We have a little problem on the ATEX protection on a horizontal dryer. The dryer is little more of a stainless steel cylinder with an agitator in the middle. There is a jacket for heating, usually at about 60°C. The dryer will have to dry a powder that is nonconductive and potentially explosive...
  14. Technopriest

    Nozzles location

    Thanks to both:) Che Dio ce la mandi buona, o almeno ce la mandi- Massimiliano Eusebi
  15. Technopriest

    Nozzles location

    Is it possible to place on a formed head outside 0,8*De? Is there any particular limitation? Vessel is to be code-stamped as per Section VIII, Division 1.. If it is not possible, in which paragraph of the code is the limitation present? I can't find it, even if my chiefs believe the limitation...
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