Isolating valves for liquid HCL / service with coke
Isolating valves for liquid HCL / service with coke
(OP)
Hi,
We have been facing serious problems in two areas of our plant. One is in liquid HCL isolating valves, we have more than 50 valves on dry HCL service at very low temperature but every now and then, we face gland leakage issue. Second, in valves afetr furnace where at pressure around 25 bar and temp of 100 deg C, HCL, VCL, EDC is there where we would need class 6 isolating valve. Currently we have butterfly valves but afetr some time, valve doesnot islate the system mainly due to carbon deposition on seats. Need urgent help
We have been facing serious problems in two areas of our plant. One is in liquid HCL isolating valves, we have more than 50 valves on dry HCL service at very low temperature but every now and then, we face gland leakage issue. Second, in valves afetr furnace where at pressure around 25 bar and temp of 100 deg C, HCL, VCL, EDC is there where we would need class 6 isolating valve. Currently we have butterfly valves but afetr some time, valve doesnot islate the system mainly due to carbon deposition on seats. Need urgent help





RE: Isolating valves for liquid HCL / service with coke
For gland leakage, you could try "live loaded packing configuration" that can compansate (within reason) on wear & thermal expansion/contraction issues). Important that you are using the correct packing materials...
What type of valves are you using ?
Ciao,
RE: Isolating valves for liquid HCL / service with coke
FOA, thanks for ur prompt response. We mostly have plug valves installed in the system. Could you please xplain live loaded packing configuration as I am not familiar with it
thanks
RE: Isolating valves for liquid HCL / service with coke
RE: Isolating valves for liquid HCL / service with coke
www.en
RE: Isolating valves for liquid HCL / service with coke
RE: Isolating valves for liquid HCL / service with coke
RE: Isolating valves for liquid HCL / service with coke
Check this link out regarding liveloaded packing on globe valves, its not "new" to valve stems, I think you will find just about everyone can supply (at extra price).
http://en.wikipedia.org/wiki/Globe_valve
For your sealing problems, metal seated butterfly valves are best for your application, triple offset again probably best, they tend to swipe clean sealing areas during final (last 3-5°) closure, solving your root problem of deposits in this area.
Ciao,
Itascot
RE: Isolating valves for liquid HCL / service with coke
Ciao,
Ian
RE: Isolating valves for liquid HCL / service with coke
RE: Isolating valves for liquid HCL / service with coke
I've used Zwick Triple Offset valves on Coke Oven Gas service with relatively good results. These had live loaded gland packing too.