Calibration of Bulk Tank with Scale - Operating capacity is 3400lbs

M

mlthompson

#11
Re: Bulk Tank Calibration

I am still trying to figure out your setup here. Is this tank on load cells? Or, is it permanently affixed to a scale? Like Jim asked, what capacity do you use this to will assist in determining how high you need to calibrate this.
We have a series of tanks. Some sit directly on load cells, some sit on scale platforms. Either way they are permanently installed.
 
Elsmar Forum Sponsor
#12
Re: Bulk Tank Calibration

With your water supply, if you have a known supply that you will use just take a sample to an accredited lab and get the water certified for weight and gravity and once you have your supply certified then periodically you can sample and check it against your standard certified water supply.

Just audit you lab to make sure their instruments are calibrated and traceable!
 

BradM

Staff member
Admin
#13
Re: Bulk Tank Calibration

I have seen all kinds of setups. Some load cells can be pulled off and have weights placed on them. The output of the load cells can be measured.

Let’s face it… It’s hard verifying the accuracy of tanks/large weights.
 
M

mlthompson

#14
Re: Bulk Tank Calibration

Well folks I was getting goose bumps for having a solution with using the water idea. The concern that came back from our process engineer is that after calibration, the water will be contaminated due to residual chemical from the tank and will have to be disposed of as hazardous material. Also, after calibration, any residual chemical still in tank will be saturated with water which will have adverse effects on future chemical blends.
 

BradM

Staff member
Admin
#15
Re: Bulk Tank Calibration

You could use the same setup with the chemicals you put into the tank.

It all boils down (to me) how accurate you really need to be. You could tank measurement dimensions and go off of volume, if you didn't need to be that accurate.
 
M

mlthompson

#17
I'm thinking the following:
  • Make chemical blend as normal
  • Drain chemical into secondary tote(s) sitting on calibrated scale
  • Pump chemical back into same tank in metered amounts
  • Calibrate tank scale at various increments

Does this sound legit?
 
D

DsqrdDGD909

#18
Re: Bulk Tank Calibration

Well folks I was getting goose bumps for having a solution with using the water idea. The concern that came back from our process engineer is that after calibration, the water will be contaminated due to residual chemical from the tank and will have to be disposed of as hazardous material. Also, after calibration, any residual chemical still in tank will be saturated with water which will have adverse effects on future chemical blends.
What is the chemical? Flow meter and specific gravity is still the way to go. What is the required accuracy? Over what range, with what needed precision? How do you currently clean the tank? Can it be heated?
 

Scott Catron

True Artisan
Super Moderator
#19
Re: Bulk Tank Calibration

Well folks I was getting goose bumps for having a solution with using the water idea. The concern that came back from our process engineer is that after calibration, the water will be contaminated due to residual chemical from the tank and will have to be disposed of as hazardous material. Also, after calibration, any residual chemical still in tank will be saturated with water which will have adverse effects on future chemical blends.
Are the chemicals water soluble? Why would a minor amount of chemical contamination make the water a hazardous waste? Would it violate a discharge permit?

If the chamicals are water soluble and there's no problem with disposing of the water, using a calibrated flow meter would be the way to go.

This issue would be moot if the calibration company would do what you asked them to do - is there some reason they won't other then they think you don't have to? That's not really for them to decide.

You could write an SOP for calibration companies to follow when they calibrate your equipment.
 

Tim Folkerts

Super Moderator
#20
Here is a table I found for the temperature dependence of density for pure water.

Temp (°C) Density (g/cm3)
30 0.9957
20 0.9982
10 0.9997
0 0.9998
If you can measure the temp to within a couple degrees, then the density will be correct to within 0.1%

Also, I don't know specifically about dnsity of tap water, but seawater is about 1.025 g/cm^3. Since this has much more dissolved solids than tap water, the different in density between pure water and tap water will be much less than this 0.25% difference.

And I just found another source at http://www.simetric.co.uk/si_water.htm
that suggests that tap water is practically idential in density to pure water.


On the other hand, why even bother with density? Wouldn't it be easier to just weight the water, rather than measure the volume?


Tim
 
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