Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations SDETERS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by Dhurjati Sen

  1. Dhurjati Sen

    Thoughts about this weird microscopic corrosion

    What is the origin of the 304L tubes? Carry out chemical analysis of the tubes to ensure that the onus is only on the water.
  2. Dhurjati Sen

    How to know exactly which filler metal?

    Go through ASME Section IX to know about P nos, F nos etc.
  3. Dhurjati Sen

    API 650 SPOT RT

    Are you constructing a new tank or replacing shell courses of an existing one? API 650 is applicable for the former while API 653 is for the latter.
  4. Dhurjati Sen

    Inadequate PWHT holding time for Carbon Steel piping in caustic service (NACE SP-0403)

    If you go for various lab tests like metallography, hardness, tensile strength etc., you won't get much difference between samples heat treated as per NACE or ASME. I have faced such situation and the non-conformity that I raised was closed based on such tests. I was a quality assurance /...
  5. Dhurjati Sen

    ASTM A1011 grades versus other materials that are very weldable, forming, and fatigue resistant

    Dear DustMan, What I meant exactly were as follows: 1. There should not be a material diversity in your application, like you are using both CS and SS, which could lead to Galvanic Corrosion. 2. The corrosion behaviour of the product that would flow through the CS or SS application needs to be...
  6. Dhurjati Sen

    What is Supporting the Annular Outer Ring at Bottom Draw-off Drains per API 650 Appendix O?

    "All this for a localized thinning of the outer annular plate....." YES as yours is a mounted tank. The onus of this scenario lies on Civil Maintenance & Inspection Department as the vegetation issue took quite some time (maybe months) to cause such thinning all the while those guys were...
  7. Dhurjati Sen

    Welding on SS and NACE MR0175

    Always better to demonstrate the hardness in the PQR. If the hardness is off limit in the field joints, you may have to go for a fresh PQR in addition to cut and re-weld those joints.
  8. Dhurjati Sen

    Tank Bottom Bevel

    Refer API 653 bottom plate replacement and NOT API 650. Once you go through, hopefully, you will not have any doubt.
  9. Dhurjati Sen

    Dry-run in GTG Waste Heat Recovery , ISO 21905

    The Gas Turbine (GTG) and the Heat Recovery Steam Generator (WHRU) are connected through duct. When WHRU fails, the gas turbine exhaust is diverted to the intermediate stack through diverter damper. During normal operation, the flue gas passes through the guillotine damper, then the WHRU and...
  10. Dhurjati Sen

    ASTM A1011 grades versus other materials that are very weldable, forming, and fatigue resistant

    You do not have a design / engineering team? This is not the way to specify or substitute a material.
  11. Dhurjati Sen

    What is Supporting the Annular Outer Ring at Bottom Draw-off Drains per API 650 Appendix O?

    1. Is the corrosion external only? 2. Did you carry internal inspection of the tank after the thinning was noticed? If the answer to 1 is yes, then find out the reason. Possible causes could be rain water accumulation, presence of acidous gases nearby, etc. If the answer to 2 is no, then carry...
  12. Dhurjati Sen

    MATERIAL IDENTIFICATION

    Send a sample to a metallurgical lab for proper material identification. That is the ONLY option as it seems you do not have previous purchase orders / MTCs / other documents that could indicate the original material for the insulation rings.
  13. Dhurjati Sen

    Carbon Content

    Please do not double post.
  14. Dhurjati Sen

    pressure test piping of natural gas 150 Barg by N2

    Pneumatic test has been suggested due to subsequent drying issues for the pipe after hydotest. However, there are many techniques in vogue for drying of piping after hydrotest. Convince the client regarding the hazards of pneumatic test and furnish the procedures that you would perform to dry...

Part and Inventory Search