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  1. DjazAutomation

    Process instruments testing- Practical approach to define Pass/Fail measurement errors

    Many thanks IRstuff and sorry for the late reply. It's seems that I was heading in the wrong direction... It's true that it's the Process accuracy requirement (Customer requirement as you call it) that matters to define the tolerable measurement errors. I was trying to start from an existing...
  2. DjazAutomation

    Pressure gauge movement and bourdon tube dimensions and standards

    The following standards might help: EN 472 : Pressure gauge - Vocabulary. EN 837-1 : Pressure gauges. Bourdon tube pressure gauges. Dimensions, metrology, requirements and testing. EN 837-2 : Pressure gauges. Selection and installation recommendations for pressure gauges. EN 837-3 : Pressure...
  3. DjazAutomation

    Process instruments testing- Practical approach to define Pass/Fail measurement errors

    Some process instruments such as PT (pressure transmitters) demonstrate an accuracy of 0.1% or 0.2% (depends on the technology of course). I understand that to calculate the overall measurement error of the measurement system (measurement system: PT + impulse line + Valves + PLC input module +...
  4. DjazAutomation

    Clogging of DBB Valves - What solution ?

    Many thanks thost Do you know where I can get those monoflange DBB valve with 2 metal seated ball valves (suggested manufacturers if the Forum allow it) ? So far, I could find only resilient seated ones. If this solution is adopted, the instrument maintenance procedure should describe clearly...
  5. DjazAutomation

    Clogging of DBB Valves - What solution ?

    Again, many thanks for both of you. Always good to see things from different perspectives. Indeed, metal seated ball valves seem be to be a better fit for the application than the soft seated ones. I was looking for an inherently safe design (Full DBB) but it seems to me now that it's difficult...
  6. DjazAutomation

    Clogging of DBB Valves - What solution ?

    Thank you all for your replies. I really appreciate it. The instruments where we have this issue are used for high pressure (75 Bar) and with fluids such as amine or hot oil. The EPC contractor installed those monoflange DBBs for energy isolation. The monoflange DBB are relatively small and...
  7. DjazAutomation

    Clogging of DBB Valves - What solution ?

    Hi, In our gas processing plant and for many DP cell flow instrument, we frequently experience clogging of instrument DBB valves (double and Bleed valves)due to debris being present in the process fluid. Those are monoflange DBBs with three needle valves (two as block valves and one for...
  8. DjazAutomation

    Is a liquid drain trap suitable or not?

    Thank you all for your suggestions. As you proposed, I'll try to get in touch with Density or conductivity detectors supplier in order to get accurate information about the suitability of the solution and the constraints that I need to take into consideration in the design. Again, many thanks...
  9. DjazAutomation

    Is a liquid drain trap suitable or not?

    Thanks gerhardl, it seems to be a great Idea (I drew a sketch based on it). However, I am wondering what would be the best technology to use to detect density. Reliability and maintenability of the instrument is really a concern for me. Regarding the actual conditions, I still don't have all...
  10. DjazAutomation

    Is a liquid drain trap suitable or not?

    Thank you ash9144 and gerhardl for these valuable information. I think now that a liquid drain trap is definetly not suitable for this application. I even asked Spirax Sarco, I got the same answer. So, I am comfortable with this decision. Thank you for that. Moreover, I was wondering about a...
  11. DjazAutomation

    Is a liquid drain trap suitable or not?

    We have a storage tank for gas condensates in our Gas central processing facitliy. We are facing some difficulties to drain only water from the tank without draining Gas condensates (Liquid). Hence, we loose significant qunatities of gas condensates when the operator drains the tank manually. I...
  12. DjazAutomation

    How to determine Flange Bolts Material and Grade?

    Thank you very much, In fact, the gasket type is already determined according to our design conditions (Pressure, Temperature, Fluid). We've taken into account these parameters and checked them with the manufacturer's (George Fischer) solutions. Each solution has its own requirements regarding...
  13. DjazAutomation

    How to determine Flange Bolts Material and Grade?

    Hi everybody, I want to know how to determine the bolts material for a plastic flange connection (PE100, or simply polyethylene). Actually, this connection is done by using stubs and backing flanges. I know that the material will define how much torque the bolt can withstand (As well, the...
  14. DjazAutomation

    Plastic Lined Steel pipe issues.

    Great! I would like to thank you all for these valuable information. I am studying all these possibilities (Using Spacers, pull a liner through the pipe, Resistoflex Field kit, etc.) to understand the pros and cons for each solution. After that, I think that I will probably have more questions...
  15. DjazAutomation

    Djaz: Plastic Lined Steel pipe issues!

    Hello, I would like to know how to install plastic lined steel pipe in a typical process. Is it true that Lined pipes must be purchased premanufactured by specifying precisely the lenght of each unit, beacause it is impossible to cut the pipe the right lenght on site (Can Affect the plastic...
  16. DjazAutomation

    Plastic Lined Steel pipe issues.

    Hello, I would like to know how to install plastic lined steel pipe in a typical process. Is it true that Lined pipes must be purchased premanufactured by specifying precisely the lenght of each unit, beacause it is impossible to cut the pipe the right lenght on site (Can Affect the plastic...
  17. DjazAutomation

    PE pipes: Flange vs union connection/Stubs and fixed flanges

    Thanks a lot! I will take all your remarks into consideration. Djaz.
  18. DjazAutomation

    PE pipes: Flange vs union connection/Stubs and fixed flanges

    Thank you very much pennpiper, Do you think that it would be also possible to connect a stub to a lined pipe fixed flange? I know that these flanges are raised flange type. Do i need a spacer to insert between the stub and the fixed flange? Or is it possible to simply connect the stub to the...
  19. DjazAutomation

    PE pipes: Flange vs union connection/Stubs and fixed flanges

    Good morning, I would like to know which assembly method is the best to connect PE100 pipes with Plastic valves (PP or PVC). I need a detachable connection and i am hesitating between union connection and flange connection. The process pressure does not exceed 6 Bars and the temperature is...
  20. DjazAutomation

    What kind of Hcl gas Scrubber is shown on the image?

    Thanks a lot ash9144, i'll take these valuable remarks into account. By the way, do you know some manufacturers for seal pots? (Specially in europe). I need to get a quote. Thank you very much. Djaz.

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