Crude Oil Offloading Rate of VLCC's?
Crude Oil Offloading Rate of VLCC's?
(OP)
Can someone confirm or corrcet the numbers that I have for Offloading rate of VLCC type ships? According to my sources which are questionable, VLCC's pump heavy crude at 9000 cubic meters/hr at 12-15 barg. Does this sound right? Do different VLCC tankers have different pumping capacities?
At this rate and pressure, we'll end up with a 48" NPS pipeline stretching 4 km at subsea & 8 km onshore before reaching the Storage Tank area.
By the way the Oil is first offloaded from the ship to a CALM Buoy unit then down through flexible hoses to the subsea pipeline.
Your input is appreciated
regards,
drno
At this rate and pressure, we'll end up with a 48" NPS pipeline stretching 4 km at subsea & 8 km onshore before reaching the Storage Tank area.
By the way the Oil is first offloaded from the ship to a CALM Buoy unit then down through flexible hoses to the subsea pipeline.
Your input is appreciated
regards,
drno





RE: Crude Oil Offloading Rate of VLCC's?
Or especially don't forget to do the transient flow analysis. I was loading a ship when a storm blew the tanker off the CALM and it was ESD button time. I saw a our pipeline terminal go from 30 to 117 barg, (17% over allowable pressure). True we were loading 500,000 bopd, not unloading. Well, just keep it in mind.
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RE: Crude Oil Offloading Rate of VLCC's?
Like you said, in my case we're offloading from the SPM/PLEM to the shore and I will certainly look into ESD cases downstream of the PLEM. We'll probably end up with a surge tank at the PLEM. I am really concerned about the floating hoses and submarine hoses upstream of the PLEM. I am pretty sure the VLCC tankers have some sort of relief or surge system to protect their pumps. If you have any tips on this topic, I'll certainly welcome them.
much obliged,
drno
RE: Crude Oil Offloading Rate of VLCC's?
The ships I was loadingat the time (20 yrs ago) did have shut-down systems on their receiving lines. Once one activated her ESD by mistake and when I heard our pipes slamming around and noticed our pressures rising, I shut our station down too. All our piping and hoses survived, but the ship's piping did not. They broke one flange. In the morning we went out to see what went on during the night and there was oil all over the deck and running off the sides into the bay. Coinciently, our relief tank was being serviced that same day. Someone installed the vacuum breaker upside down and the top "corner" had been sucked in at one spot a week before. Construction had spent 3 days cleaning the tank to make repairs the next day and the last thing they said before they left for the day was, "Try not to use the relief tank tonight". Oops!
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