Q & A

Welcome to ePTQ's Q&A: the technology Q&A for the refining, gas, biofuels and petrochemical processing industries. You can browse existing questions and answers by topic or date or carry out a freetext search.

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We are excited to be Strategic Partner of the World Refining Association’s ERTC: Ask the Experts. From the organisers of ERTC, the biggest and most important event for the European downstream industry, this is the only event in Europe offering process and maintenance engineers a platform to ask their burning questions about the everyday challenges facing their plant and hear the practical solutions from industry experts.

This face to face interactive event features experts from leading European refineries and technology providers; engineers have the chance to hear unparalleled knowledge through interactive discussions such as fishbowl panels, Q&A Panels and Poster Sessions. Learn more at: asktheexperts.wraconferences.com  


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Recent Questions
Date  Replies
26/04/2021 Q: We are facing lots of solid formation in the quench tower circuit of our TGT Unit. What can be the reason and how are solids/salts formed in this circuit?  
17/04/2021 Q: Possible VGO discoloration causes in a tank with nitrogen blanketing?
Oxidation leads to gum formation but is it the cause?
Metal content was well within range. So what could be the reason? 		 
17/04/2021 Q: We are having a problem with the product fractionator bottoms pump (multistage centrifugal Pump turbine driven/standby motor driven)(inlet ~330 deg C) of a MHC unit; whenever the pump is taken in service and made ready after maintenance and primed (previously used to prime from the suction valve, now try to prime with a warm-up line) the downstream fired heater (thermal cracker) trips due to low flow as soon as the suction valve is crack opened to take it in service.
Any suggestions on how to rectify this issue?
 		 
10/04/2021 Q: Which is a better option to control firing in the furnace: connected temperature controller with fuel gas controller; or connected temperature controller with low selector?  
10/04/2021 Q: In our DHDT unit (Axens licensor) one PV is given after the feed filter package to maintain a back pressure of 5kg/cm2. What is its importance?
In the other DHDT unit (Haldor Topsoe) there is no PV given.

 		(1)
Recently Answered Questions
Date  Replies
26/09/2012 Q: I have observed corossion in my crude overhead line to finfan coolers. The overhead line is not insulated and the temperature here varies from zero to 55 degree celsius. Would insulating the line help me in reducing the corrosion? What are the other impacts of overhead line insulation?
Note: We are operating the top temperature 25-30 degress above the dewpoint temperature. 		(7)
30/03/2021 Q: One of our fired heater gas burner's riser pipes is frequently plugged with coke-like formations on the internal periphery. Since it was identified that our fuel gas sulphur content was pretty high, my best guess for the cause of black material deposits was iron sulphide. But I read somewhere that fuel gas with high olefins can also coke up inside the riser pipes. Anyone else faced similar problems in their fired heater? If so, what was the mitigative measure taken to overcome this? (5)
23/02/2021 Q: In a sponge absorber why is absorption of LPG by lean oil (naphtha) an exothermic reaction? (2)
10/04/2021 Q: In our DHDT unit (Axens licensor) one PV is given after the feed filter package to maintain a back pressure of 5kg/cm2. What is its importance?
In the other DHDT unit (Haldor Topsoe) there is no PV given.

 		(1)
10/04/2021 Q: During precommissioning a diesel unit why we can not start the recycle gas compressor with 100 % hydrogen before catalyst sulfiding as per the licensor: 50% nitrogen with 50% hydrogen? (2)
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