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  Statistical Techniques and 6 Sigma
  Statistics Applied to Bulk Materials

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Author Topic:   Statistics Applied to Bulk Materials
Lurker (<10 Posts)

Posts: 6
From:New Madrid, MO, USA
Registered: May 99

posted 18 May 1999 03:28 PM     Click Here to See the Profile for SGS     Edit/Delete Message   Reply w/Quote
Our company recently obtained QS9000 certification. Our registration company cited statistical techinques (lack of them)as a weakness in our system. Any tips for applying statitics to a bulk process such as the reduction of alumina to aluminum?

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Don Winton
Forum Contributor

Posts: 498
From:Tullahoma, TN

posted 18 May 1999 04:33 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Our company recently obtained QS9000 certification. Our registration company cited statistical techinques (lack of them)as a weakness in our system.

Typical. To see the lack of a tool as a weakness without understanding the process is absurd. For example, to drive a nail, I need a hammer. I have many types to choose from, so I select the best tool for the job. But, I digress.

Under the assumption that the statistical techniques you wish to add to your system add value, consider this.

All processes must have inputs (flow rates, rates per hour, pressure, etc). You could start with your inputs and apply statistical techniques there. I would not begin to assume to assign a particular technique without knowing more.

All process must have outputs (weights, content purity, etc). These can also be assigned a statistical technique that adds value.

Start with inputs to the process. Identify Key Input Variables (KIV) and determine which have a direct affect on your Key Output Variables (KOV) (an Ishikawa or affinity diagram works nice for this).

Next, determine which statistical technique is applicable to the particular KIV. For example, if pressure is determined to be a KIV, you could monitor that with an X-MR chart by measuring the pressure once per hour. You could monitor pressure by a subgroup of four readings every 15 minutes (or every four hours, if applicable), calculate Xbar and range and use the typical Xbar-R chart.

Once the KIVs are determined and brought under control, do the same thing with the KOVs.

BTW, being a bulk processor, I would wager you are already using a statistical technique: sampling. But, I could be wrong.


Just the ramblings of an Old Wizard Warrior.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 16 August 2000 07:05 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
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