This topic contains 6 replies, has 4 voices, and was last updated by Anonymous 12 years, 1 month ago.
May 13, 2005 at 12:38 am #4353
Is any one out their using the combination cutting and boring tool to cut coke. Need to know if you are having trouble with the nozzles plugging
* Does any one have the ( Old Style ) boring / cutting tools around & still use them..[:)]
* Are maint’s dept are saying the tools nozzles plug which causes the jet pump to thrush
burning it up ( 4 pumps in the last 2 months
June 6, 2005 at 12:35 am #7793
Chevron El Segundo is using the Flowserve “auto-switch ” cutting tool. Took a few years working with vendor, but now working well. THANKS
October 25, 2005 at 1:51 pm #7729
We are looking at implementing a trial of the auto-shifting cutting tool. I’m most interested in the specifics of what you needed to change/modify to move over to the new tool? One concern of ours is if the auto switching device will tolerate temperatures as low as -45C.
November 9, 2005 at 4:01 pm #7721
We have a combo tool that works very well. We only have nozzle plugging when we use the stem to push the coke out or when it is very soft. Both scenarios are rare. I am sure that the drillers still push the coke out with the stem at times, but they don’t inbed the tool enough to plug the nozzles. Have you looked at your pressure at the tool? Are you having coke quality issues? Meaning soft coke, shot coke, etc?
We have a set of our of tools available if needed. We keep these as emergency back ups.
El Segundo Coker
September 5, 2007 at 4:07 pm #7299
Cutting tools can also plug with rubber particles from the inside wall of a damaged decoking water hose.
November 8, 2007 at 2:01 pm #7182
some of the main reasons for plugged cutting tools are operators pushing the coke out of the drum instead of using the proper cutting technique ( undercutting the coke, letting a big section fall then chasing it to clear the bottom ), a build up of coke fines in your cutting water supply, the screens on the pump should be backflushed monthly, rubber off the cutting hose,
September 26, 2009 at 5:40 pm #5986
We have used both the Flowserve and the Ruhrpumpen auto swap bits and have had problems with both. With the Flowserve which is a spring design similar to a ball point pin, we have had problems with contamination of the oil in the spring chamber causing the bit to not swap if the oil is not changed often. This bit is of heavy design and the nozzle cones are external of the bit body. Occasionally we have had a nozzel brake off during a drill. This bit works well when the oil is changed often and we have never had an issue with plugged nozzels even if bit is used to push plugs out and is easy to manually swap from bore to cut mode if needed. The Ruhrpumpen bit is of sleeker design with less weight and is an oil free hydraulic design. The nozzles are internal and there is no chance of breaking a nozzle off. However due to the sleek design there is nothing to prevent plugging of the bore nozzels if the bit is used to take the outage or push out a plug. This bit is also not easy to swap manually as the switching mechanism has to be removed from the bit to swap the bit manually from one mode to the next. If the bore nozzles are plugged and the bit is in bore mode there is no way to drain the water out. I was told that for a 120 ft drill bit it would be approx. 500 psi at the bit. The switching mechanism weighs about 20 pounds and with 500 psi behind it as well as a large leg of water behind it packs a nasty punch.
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