What is the opposite of free-board in Process Control terminology?

drbitboy · Mar 29, 2020

IanfromOz said:
Hi Tom,
I think we're saying the same thing. [...]

Yes, but Tom's point is perhaps that the OP is looking for an antonym of freeboard/ullage.

id10t_error · Mar 30, 2020

100%, I was looking for the antonym for freeboard.

I thought the word "level" was ambiguous to the measurement reference point. Freeboard, on the other hand, seemed to have a universally accepted concrete measurement reference.

Level Definition from Google.

noun
1. a horizontal plane or line with respect to the distance above or below a given point.
2. a position on a real or imaginary scale of amount, quantity, extent, or quality.

adjective
1. having a flat and even surface without slopes or bumps.
2. at the same height as someone or something else.

verb
1. give a flat and even surface to.
2. begin to fly horizontally after climbing or diving.

Noun freeboard (plural freeboards)
1. The vertical distance between the waterline and the uppermost watertight deck of a vessel.
2. The distance between a water level and the top of something that contains or restrains it (such as a dam).
3. The distance between the top of sea ice and the water level.

Tom Jenkins · Mar 30, 2020

drbitboy said:
Yes, but Tom's point is perhaps that the OP is looking for an antonym of freeboard/ullage.

That's right.

id10t is right about the ambiguity. Since most tanks have a pitched bottom to facilitate drainage you always need to be careful about specifying the reference point, and level is the difference between the surface and that reference point.

That's not unique to level. A lot of engineering measurements are the difference between two points. Voltage and pressure are two examples.

drbitboy · Mar 30, 2020

Tom Jenkins said:
A lot of engineering measurements are the difference between two points. Voltage and pressure are two examples.

Which is why the "zero calibration" is as important as the "gain calibration."

What is the opposite of free-board in Process Control terminology?

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