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
Recently Answered Questions
Date  Replies
31/10/2020 Q: Is there a practical solution for converting HPS to BFW? for some reason, we can only access HPS while we need BFW for temperature control in the steam reformer. (1)
06/05/2020 Q: We are facing an issue of LPG product off spec due to total sulfur being high. We have an amine treating unit followed by caustic treatment with CFC technology (EIL). Since the caustic regeneration system is not working frequently, caustic dumping and fresh caustic (25 Be) charging is being done. While the CFC unit is designed for RSH 4500 ppm and 100 ppm H2S, actual numbers are H2S NIL and RSH 1350 ppm in LPG.

The following activities have been done so far:
a) Line up checked for mixing feed and product to rule out short circuiting
b) Caustic strength reconfirmed and dumping / charging increased
c) Circulating caustic flow has been maximized and presently it is ~19.5 m3/hr.
d) Caustic levels in contactors have been increased to 70% to increase residence time.
e) Feed to CFC was reduced from 58 to 50 m3/hr.

1. Is there anything which we are missing?
2. Is there any impact of Erha crude which we are processing in the CDUs?
3. What is the experience of troubleshooting in other Refineries?

19/07/2020 Q: We are facing a problem in crude/condensate decanting which is received from local fields. Settling time for the oil tankers is one hour; after this a dip is taken, water observed in the dip is nil. Then we decant the tankers into our crude oil tanks. After settling time for the tanks we are observing raised water level. What can be the potential causes? (7)
12/11/2019 Q: Hello, In our hydrogen production plant we have our own steam generation system that produces 36 bar of steam at 390 degree C temperature. Steam produced in the steam drum has a continuous blow down vessel. We noticed that the conductivity analyzer goes so high that it reaches to NAN sometimes as it automatically reaches to its normal values without any external steps taken by us. We are curious about this automatic adjustment of conductivity in blow down. We have checked the instrument as well, but there is no issue with the analyzer. It is to be noted that the BFW is mixed with condensate separator before pressure swing adsoprtion. The condesate water first goes to degasifier and then mixed with demin water and then pumped to steam drum where steam is made. From couple of days pH of condensate is very low due to low inlet temperature due to dissociation of carbon dioxide, which made pH low. Kindly tell us if there is any reason for high conductivity as per our case. (1)
20/09/2020 Q:
We use semi-catalytic reforming to produce gasoline with LPG as a byproduct. Our problem is the LPG copper strip corrosion test reads 4b as a mean high. Any recommendations to decrease this value to 1a or 1?