[Neelabh Sharma]

Liner is Alumina 96%
 
Ours is Krebs Hydrocyclone…don’t know much about other vendors

[Neelabh Sharma]

I dont know why would someone want individual derrick structure, i guess the common derrick structure is the logical way forward.
For operational ease, I would say that the derricks needs to be connected at several levels to enable maintenance of all the coke cutting equipment in one go..

[Neelabh Sharma]

ya, we use LL suction pressure tripping of the jet pump & it works quite well when clubbed with jet pump suction DP

[Neelabh Sharma]

Just to add a bit, height of underground water table is factor which will limit your depth……
 

[Neelabh Sharma]

our feed specs have <10%…

[Neelabh Sharma]

Yup ..Same here..simple Gate valves in both the suction & discharge line of Charge Pump…working well…for past many years…never faced any problems…

[Neelabh Sharma]

Thanks you Mitch & others for your replies……

Last week we had to bring down the coker block,…because the feed valve would not open….The valve was dropped…and guess what…the seat was COMPLETELY filled with coke fines…which had got compounded over a period of time & had gradually lifted the ball up…so much so that it had hit the roof & had completly prevented the ball movement..In a record time do 2 days… 2 nos….of 14″ ball valves……were dropped cleaned & boxed up again….the vendor was citing improper flushing of spool piece…but upon dropping the valve the feed line was completely clear with no coke deposition whatsoever…..This foxes us….we feel it is more  to do with the valve steam purges & not with feed line flushing (which we already do for 5-10 minutes)…also we have removed the feed line RO that we initially had…..your comments please

One more query: Why do you suggest to start flushing before moving Switch valve  to final position…does it help much ?

[Neelabh Sharma]

Usually there are Top & Bottom proximity sensors coupled with 2 nos. of ‘Drum in’ sensors…typical of Flowserve…….
Some also include a variation in which there is a drum washing limit sensor also incorporated which is higher thatn the ‘Drum-In’ signal
Position of the drill stem is determined by the rpm of the Wire-rope hoist drum having measured grooves whereby rpm is converted to distance covered and therby the drill stem position…
Bent drill stems are one-off problems…this should not ideally be the basis to change your system…look out for the reasons of Bent drill stems…get drill stems replaced
I hope i have answered your query….if not please elaborate some more…

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