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Recent content by Dhurjati Sen

  1. Dhurjati Sen

    Checking inclusion content of weld filler material

    Adding such a clause in your purchase order would eliminate all local, small time manufacturers and only those big two or maybe three at most would remain.
  2. Dhurjati Sen

    Connection Between Tanks

    If a tank needs to be taken out of service (say, an emergency shutdown in case of a leak), its content could be transferred to the other tank.
  3. Dhurjati Sen

    Galvanic corrosion for material choice

    Once you eliminate galvanic corrosion and also external corrosion, you need to focus on internal corrosion which would differ for different materials. And this could be the most important aspect of your design. To elaborate a little, corrosion products from carbon steel could choke your cast...
  4. Dhurjati Sen

    Corrosion(?) on stainless at a waste water plant

    You must have got to the bottom of the issue by now. It would be nice if you share the findings in the forum. Even if no action was taken as the corrosion seemed superficial, stating it would enrich us
  5. Dhurjati Sen

    Tangential Radiography of 16" pipe

    RT has been used to find out internal pits in water wall tubes of boilers. So, why not here? Tangential shots with Se could be okay but why cost save on RT (compared to more number of shots with Ir)?
  6. Dhurjati Sen

    Pneumatic test in refinery construction

    Kuwait National Petroleum Company (and for that there must be many others including Shell DEPs) have pneumatic test procedures which are very good.
  7. Dhurjati Sen

    How many atoms are in one unit cell of ferrite (BCC)?

    One BCC unit cell of ferrite contains two Fe atoms. This is what we have read in our Metallurgical Engineering classes. My question is: this is just a theory to explain various mechanical and physical properties of metals, right? After all, the unit cell is a concept. Can it be physically verified?
  8. Dhurjati Sen

    Risk of through hole on live piping

    It seems only option is to take a shutdown and cut and replace the corroded portion with identical piping. Your safety department might not issue a permit for the temporary repairs listed above for this particular service of the pipeline.
  9. Dhurjati Sen

    CEMS Carbon Monoxide Spikes

    Check the instruments that measure CO. Also, check if there is any blockage / condensation / corrosion in the oxygen supply line.
  10. Dhurjati Sen

    CEMS Carbon Monoxide Spikes

    Have you checked the burners?
  11. Dhurjati Sen

    Crevice corrosion in 316L threaded fitting

    1. As sea-water rinse cycle given in procedure, no point in deviating from it. 2. There is a basic difference between crevice and pitting corrosion. As per you, since it is crevice corrosion, so removing the crevice(s) is primary. Once there is a crevice, corrosion would occur, maybe at...
  12. Dhurjati Sen

    PWHT MULTIPLE TIMES ON THE SAME JOINT OF SA335P91 MATERIAL

    It seems the PWHT has been rejected...was there a failure of the heating coils or the power source during treatment? Did the chart did not conform to the heat treatment cycle? Or did you get hardness values outside limits? Answers to above would help to reach a solution.
  13. Dhurjati Sen

    Effect of microstructure on crevice corrosion for SDSS

    Send a sample of the affected flanges to a laboratory for chemical analysis (and not a PMI test) to check if these really conform to S32750.
  14. Dhurjati Sen

    White smoke coming from stack

    My thoughts exactly matched with TBP. However, from the picture it seems you have two boilers. If yes, what about the other? Is it under shutdown? If no, then why white smoke is not coming out from its stack?
  15. Dhurjati Sen

    PREHEAT

    What does your WPS say about it?
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