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In the DCU’s I worked we would sample the fractionator feed. (Or the VTB).
Regards
CG -
Hi,
You might want to check page 69 of 131 (Question 48) in the document linked below:
http://www.npra.org/forms/uploadFiles/E1F600000026.filename.AnswersBookrevised.pdf
Regards
CG -
Two things come to mind:
1. You said the valve is operable by hand. The actuator/motor could be bad.
2. If the valve got switched without proper steam pressure, then the resid can get into the cavity. If this is the case it wont be long before this resid get hard inside and makes the valve inoperable.
Regards
CG -
In a plant I worked a few years ago we had both.
The flat conveyor was used to move coke from the pit to the storage area.
From the storage area to the shiploader dock (about a mile away form the shoreline) we had the pipe conveyor to prevent/minimize coke from falling in the water.
Regards
CG -
The document in the link below might be helpful:
http://www.ortloff.com/files/papers/HydrEng2.pdf
Regards
CG -
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Good morning,
In the first coker I worked, the set up was 4 drums, 2 heaters and 3 heater charge pumps (2 running – 1 spare). So one pump would feed one heater and a pair of drums. Simple. No minimum flow line required because the pump could cover the operating range without going below minimum flow.
About a year ago I participated in a 4 drum coker startup in the Gulf Coast that had only 2 pumps. One running – one spare. The running pump would feed 2 heaters. (each heater – 2 drums). This system had minimum flow line to protect the pump from going below minimum flow if one heater tripped. (Or when running at reduced rates).
Because the heater charge feed has coke particles (as big as 1/2 inch) the minimum flow control valve has to be capable of passing coke particles this size. The pressure drop was 600 psig (pump discharge) to 15 psig (bottom of fractionator). This was done with two valves in series.
Hope this helps.
Regards
CG -
This system should have a medium pressure steam supply downstream of the control valve.
In case of a loss of wash oil flow, the medium pressure steam will clear the HKGO in the header and prevent it from coking. (It doesn’t take long to plug the washoil spray header).
Regards
CG -
Hi,
Space is your main issue. If it is an older coker, trying to fit a deltavalve and double feed lines can be difficult.
CG
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In the last coker I worked, we only used steam to warm up an empty coke drum for start-up. While running, we would warm the empty drum with the hot vapors of the “coking” drum.
I’m guessing here, but your coker probably doesn’t have a “coke condensate drum”. This is where we would recover the hydrocarbon liquids from the drum being warmed. From this drum, we would then pump the liquids back to the fractionator, entering below the heavy coker gas oil draw pan and above the the sheds.
Regards
CG -
This document should help answer some of the questions.
http://www.peerlessxnet.com/documents/B-0077.pdf
Regards
CG -
Good for you Brian. Best of luck with your new endeavors.
Sincerely
Claus -
Total Says Port Arthur, Texas, Coker Project Starts Safely
By Leela Landress –
document.write(dateFormat(new Date(1304612716000),”mmm d, yyyy h:MM TT Z”));
May 5, 2011 11:25 AM CT
Total SA (FP), Europes third-largest oil company, started a new 50,000-barrel-a-day coker project at its Port Arthur refinery in Texas that will increase the refinerys ability to process heavy and sour crude oil, according to a company statement.
http://www.bloomberg.com/news/2011-05-05/total-says-port-arthur-texas-coker-project-starts-safely-1-.html -
Mule ear tip:
Make sure you mark every plug location, so you can put it back in the same place after maintenance.
Regards
CG -
You might find this article helpful:
http://www.fwc.com/publications/tech_papers/files/HP09%20OptimizeCokerOps.pdf
Regards
CG
