Evaluation of Coker Valve

[Freddy MartinezParticipant]

I am doing delayed coker insrument engineering first time.

What things to be taken care while selecting coker valves ?

Your reply will guide me to right decision

thanks

-kaushal

[antonio saura CebrianParticipant]

It depends on which valves are you speaking; for example the first valves that you  have  take  care in their selection are the control  valve to the heater because those are going to work with high delta P and  solids also their bypass ;  since those can generated  high vibration when they are used, some units design that bypass with the same control valve or they install  robust valves, since in some units they have generated leak and  fires
The other valves are the called switch valves and valves SP-6 (entry of the coke drums), as well as the valves associated to the top of coke drums Sp-1/2/3  and those that go towards to the blowdown system. Exist several companies that offer very good designs  for example Velan company (they offer ball valve (switch and SP-6/1/2 and  ring valve  (SP-3)) . In the past these valve were gate or wedge pulg valve
You can find more information in the old discussion forum,and also from the sponsoring of this forum

[Anonymous]

Hi,

Thanks for reply.

Ok, let me go ahead a bit

What is preference between wedge plug and ball

There is onl one vendor offering ball type valves i.e. velan

why onley ball is reuqire

wat r the merits for that

[antonio saura CebrianParticipant]

There are several companies that manufacture similar models of valves such as valve KEE; homines valve; METSO company
Currently most of the designs are specified with ball valves, in many cases is due to its operation is simpler than the wedge plug valve or switch, in both valves is essential for the proper operation keep a good injection of the steam  purge
in these directions you find information that can help you 
http://www.osha.gov/dts/shib/shib082903c.html
 
http://www.velan.com/velan/en/industries_served?id=131
WWW.epa.gov/emergencies/docs/chem/delayed_coker.pdf –

[Anonymous]

Thanks for your reply

[Author]

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