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Level Gauge Slection criterion

Level Gauge Slection criterion

Level Gauge Slection criterion

(OP)
In a separator vacum,for oil/water interface measurement it is suitable LG type reflex or transparent and the number of connextion minimum two or three connection required for this case.
Best regards

RE: Level Gauge Slection criterion

Hi!

You cannot use reflex type LG for liquid/liquid interface (also ref API 551 3.3.3.1). As the reflex type is based on reflection of the actual level, you cannot spot the actual interface bewteen oil/water (if required). So you should select the transparent type.
Regarding number of connections (several sections?) is all depending on your service.

Bonetti (www.bont.it) provides some excellent LG's.


RE: Level Gauge Slection criterion

(OP)
Hi
Thank you for your response,I will choose transparent type as per your recommendation, but the number of connection it is required only tow for oil/water interface measurement in the outlet of a separtor vessel?
ragards

RE: Level Gauge Slection criterion

Also consider magnetic level gauges instead of glass.

RE: Level Gauge Slection criterion

Hi,

For oil/water interface, magnetic level gauges will only give you the level of the combined volume, so you cannot spot the actual interface between oil/water.
For installation, various companies have various standards. TOTAL for instance has a maximum distance C-C on 2000mm. If longer range is needed, then several gauges are used, with an overlap on at least 50mm (visible). However, if the application is rather "nice", it can for sure be a longer gauge - but you might run into problems when aligning the upper/lower nozzle. Additional support might also be necessary.

RE: Level Gauge Slection criterion

(OP)
Hi
Thank you for your comment,
I tray to used tow LG between the vessel nozzele,
regards

RE: Level Gauge Slection criterion

Hi all,

I think for measuring interface, it will be better to use capacitive level transmitter or radar type

RE: Level Gauge Slection criterion

If you use an armored gage use a weld-pad gage that welds directly to the wall of the vessel so it becomes more of an observation window.  A remote-chamber gage can have a different interface level in it than exists in the main vessel.  (gage)height of lower liquid x SG + height of lighter liquid x SG=(vessel) height of lower liquid x SG + height of lighter liquid x SG.  There is not a unique solution.  If you extrapolate the above equation for a gas interface too, you will see that even the liquid/gas interface might be different in the gage than in the vessel.

Radar will only see the liquid/gas interface, not a liquid/liquid interface.  

A very carefully weighted float that floats on the lower liquid but sinks in the lighter liquid, driving a mechanical sensor, might be the most reliable way to deal with this.  

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