Claire Corlett

Fish Food, Fish Tanks, and More


Hi I’m Mark Nord Emerson Process
Management. Today I’d like to talk to you about the Fischer DVC6000 and some of
the diagnostic features that are available in it that might help you
operate your plants a little bit more reliably. You’re these DVC6000 have been
out for approximately eight years. Most people use them only for valve
positioner but there’s one very important function called performance
diagnostics that people can use to make their plant operate more reliably. What
I’m going to talk about here today, specifically, is some diagnostics that we
can use to detect whether or not your actuator diaphragm is in good condition
or not. The first thing we’re going to talk about is a graph of the air
consumption of a valve that has a good actuator diaphragm and you can see from
this graph that the air flow rate through the DVC6000 of between
five and six thousand standard cubic feet per hour. This is a normal flow rate
that we would expect to see through a valve with a good actuator diaphragm.
Also you see that we have a green light or a green check mark down here that
tells us simply that the valve is operating as we would expect it. Now this
particular example we’re referencing a sip lower valve that was installed in a
power plant in the Midwest that had an issue with the ex rater diaphragm going
bad. This next graph shows that the air consumption is increased to
approximately 220 standard cubic feet per hour. This is well in excess of what
we would expect from a standard control valve and you can also see that we now
have a yellow light down here which says the control valve is still operating
properly but it’s operating outside of its normal
range and you need to give it some attention soon. Once the customer found
this problem they were able to go out they disassembled the valve they took
the actuator diaphragm off and they found that the actuator diaphragm was
full of checks and cracks. That was a long air to leak through out
into the atmosphere the valve was reassembled with the new actuator
diaphragm the leakage went rates went back to the normal five to six standard
cubic feet per hour and the most important part is is the problem was
caught before the actuator diaphragm failure and possibly tripped the plant.
So, in summary I’ve shown that the DVC can be far more than a valve positioner.
Using performance diagnostics we’re able to solve a problem that could have
potentially tripped a plant. If you’d like more information you can go to the end
at and thank you for your time.

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