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Roy Vendor and I have measured the resistence between two point in lining, the reading is less than 1 Mega ohm some ponits even less 10 kilo ohm, So we think the lining was damaged. After the meter put in service about 8 months the reading began inacurate, the other meter now also happen same...

Dear all, After vendor check, It's said the cause is that the lining resistence became low for chemical penetration. Is it possible? lining material is PFA, Which kind of chemical can make linning conductible? Thanks!

controlnovice: Thank you first, for your question: after putting both in service, their reading almost same about 660t/h. when one reading came down to 320t/h, I have check the reading with portable ultrasonic flowmeter which show both flow are almost same about 600t/h, so i think the reading...

Dear all, In our plant we have two same waste water line,we use electromagnetic flowmeter PROMAG 50W mady by E+H to measure, the real flow is about 660t/h but one flowmete reading is only 320t/h, the other one is ok, the parameter i have checked is same, i have check and clean the lining and...

Thanks you all Here i want to explain that: first this thing only happen random and on specific valves which are hook on different segments. we have checked all hardware installation no problem.some valve are simple loop contrller output, some are a little complex but often use.I think it's no...

The IA pressure is enough and I/p is ok, I only suspect delV system.

you are right, the vlaves are digital valves with DVC6000 series controller and controlled by foundation fieldbus signal, these controller are hooked different segment,(communication through different communication card) and fail to respond to a DCS position command not at the same time.these...

thans all of you, For the valve i have mentioned work well in most time, and control signal are foundation fieldbus. when fault occured, we have diagnose them with delV and AMS, We could not see any alarm but deviation alarm (between controller output and valve travel sensor feedback), this is...

First thanks Keith cress for your quick response! for your question i answer here one by one 1.there are about 5-10 valves fault with this phenomenon. 2.Valve could not move regardless control signal change. 3.The distance is about 100 feets, but the valves which is far than 300 feets distance...

In our plant we use delV control system, some control valve with fisher DVC6020F can move by DCS, but occasionally these valve cannot move by DCS, after re-wiring(only disconnect then connect wire in valve terminal box) then it can move by DCS again, i want to know the root cause, anybody can...

I agree with JLseagull that a cascade control would help you, you can try.