Refining Community Logo

Claus Graf

Forum Replies Created

Viewing 15 posts - 1 through 15 (of 127 total)
  • Author
    Posts
  • in reply to: #13942

    Claus Graf
    Participant

    My most recent experience with Coker Cranes was 2009-2011. It was a 4 Drum Coker in the Gulf Coast with a single Kone-Crane.

  • in reply to: #12778

    Claus Graf
    Participant

    Hi,
    Have you had any carryover events in the unit?
    Regards
    Claus Graf

  • in reply to: Rotary Joint Repairs #4430

    Claus Graf
    Participant

    Any coking.com forum member would like to share any recent rotary joint story?
     
    Thanks
     
    CG

  • in reply to: High Pressure after Online spalling #4457

    Claus Graf
    Participant

    Carlos,
    It is a good practice to do before and after (on line spalling) thermal scans of the new heater, to learn how it behaves.
    Did you do a scan right after the unit startup? This is a good reference to compare.
    Too much flushing and/or steam will affect the pressure drop through the heater coil.
    Flushing can also come from heater charge pump seal (if you have a Plan 32).
    In a coker I worked we had pressure transmitters without flushing, that stopped working after a while.
    We also had about 1.5 inches of coke formation inside the transfer line, but that took a few years.
    Hope this helps
    C.G.

  • in reply to: Draining Drum Problem #4506

    Claus Graf
    Participant

    It depends on your particular arrangement. I have seen drain lines that dump into the pit a few feet away from the bottom head (through a hole in the concrete deck). Other coker arrangements have the drain lines from different drums dump into a header and then drain either into the pit/pad or the settling maze.
    Can you provide more info on your particular arrangement?
    Regards, CG

  • in reply to: urgent advise needed #4532

    Claus Graf
    Participant

    This happened at a coker I worked a few years ago.
     
    One of the overhead vapor valves (Ball 24″ MOV) got stuck. After operating a few more days the unit was shut down and the valve removed and taken apart, only to find that it was clean.
     
    The solution was to change the reduction gears (ratio) between the motor and the valve. (to increase the torque on the valve)
     
    Hope this helps
     
    CG

  • in reply to: urgent advise needed #4534

    Claus Graf
    Participant

    I agree with Mike. Too dangerous.
     
    Question: Why do you need to remove SP-6?
     
    Regards
     
    CG

  • in reply to: level of foam #4572

    Claus Graf
    Participant

    Hi.
    Who is the coker licensor?
    I have found several good articles here.
    See attached link below:
    http://www.fwc.com/publications/tech_papers/files/Fine%20tune%20your%20delayed%20coker.pdf
    Regards
    CG

  • in reply to: Coke compressor online cleaning #4574

    Claus Graf
    Participant

    Good day Marc,
    The coker wet gas compressors I have experience had naphtha injection via a nozzle in the suction pipe.
    A few things need to be checked before doing the operation. How long has the compressor been running? Has it loss efficiency? How much ? Is the piping clean ?
     
    Regards
    Claus
    [quote=Guest]

    Good morning,
    is there any general procedure available for cleaning the coke compressor without stopping it? We have a new compressor with a manual system of naphta injection in each impeller.
    I would like to know any useful information to proceed, because it is the first time I am facing it.
    Thank you for your support,
    Marc
    [/quote]

  • in reply to: Top and Bottom Unheading Devices #4618

    Claus Graf
    Participant

    Hi

    Two things to keep your Delta Valves working properly: steam supply & hydraulic fluid cleanliness.

    Monitoring your steam supply to the bonnets will provide indication of the gate and seats condition.

    The hydraulic fluid and the HPU require filter changes (typ.) every four to six months.

    The valves can be serviced at the turnaround replacing the seats and gates.
    Regards

    CG

  • in reply to: Coke Drum steam-to-water quenching transition #4637

    Claus Graf
    Participant

    Think of it like a NASCAR race. All cars have 4 tires, an engine, seat belts, a driver and a pit crew. Do they all come into pit lane exactly at the same time to change tires, and fill up with the same amount of fuel? No.
    You need to figure out what works best for your coker. I believe there is a greater risk of plugging during the coke drum switch (thats why you start injecting steam before the switch).
    Your coker should have quench water flow meter(s). I would try lowering that 5000#/hr when starting the water flow, keeping an eye on the water flow meter, so that there is always water going into the drum.
    Anybody in this forum wants to help tim by sharing their ideas/experience?
    Regards
    CG

  • in reply to: Coke causing tube failure #4673

    Claus Graf
    Participant

    Where did the tubes break?
     
    Regards
     
    CG

  • in reply to: Feed Swings #4726

    Claus Graf
    Participant

    I agree with espana2005, you might have solids accumulation at the end of the header. If the header is the same diameter all the way, the last pass will have a lower flow (speed). The coke will give you problems with the orifice. Does your coker have a strainer inside the fractionator? Or does it have strainers on the suction line of the heater charge pumps? What is the mesh size?(What is the biggest size of coke that can go through?)
     
    Regards
     
    CG

  • in reply to: coke drumstructure fire proofing #4759

    Claus Graf
    Participant

    In a 4 drum DCU I worked last year, we had two (2) oscillating monitors on the cutting deck. We also had sprinklers on the deck and stairs, and a firewater booster pump feeding this system. No fireproofing.
     
    Regards
     
    CG

  • in reply to: Falling coke #4782

    Claus Graf
    Participant

    Also, during back warming you might get coke in you blowdown drum, coke condesate drum and or backwarming strainers, depending on your set up.
     
    I would look first into your cutting procedure. Check for time (cutting too fast?), upper dome cleaning (some systems have a cleanout mode), sound of water against the drum wall and color of water during cleanout.
     
    Regards
     
    CG

Viewing 15 posts - 1 through 15 (of 127 total)
Refining Community