Steve McKenzie wrote:
> Hi Paritosh Garg
>
> I think Pauls answer was a little tongue-in-cheek, but basically
> correct.
> One of the first items to be finalised in plant design is the footprint
> of the installation and buildings. It is unrealistic to expect that the
> design of every measurement station to be optimised at the time of
> footprint finalisation. Normal practice is to reserve sufficient space
> for a conservatively designed measurement station, plus a bit (typically
> 30%), to ensure that sufficient space is available for a rational
> station design (and unforseen stations) as the entire plant design
> matures.In other words, grab as much space as you can as early as you
> can.
> The final station design will depend on the form of
> contract/understanding between the plant designers and the owners.
Yes, that was what I was getting at.
I also wanted to mention elbow flowmeters, but I couldn't find a decent, non-biased explanation of how they work.
Any good instrumentation crew can reliably measure flow based on ideal conditions, but ideal conditions are not always available in a finished plant.
One example of this design philosophy might be that it would be better to locate a pump closer to its suction source in an ideal world. But simplicity of design and long-term maintenance considerations dictate that the pump be located under the pipe rack with the other machines that will need periodic maintenance.
I've seen/been in 150 year-old pulp and paper facilities where there seemed to be no overall original design philosophies, and they are quite a mess.
Paul Received on Sat Nov 13 19:45:00 2004
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