Chemical milling design limitations

Very high temperature-rise permissible limits of resistance units render them unsuitable for installations which are fire-prone, such its pulp and paper industries, chemical industries, refineries, textile mills, etc. For specific iipphcations and surroundings, however, resistance design can be altered (derated) to restrict the temperature rise to within desirable limits. 

The next step is to set performance and cost criteria for the system in order to be able to determine whether the new greener design is acceptable. Chelants are often one of the hidden components in a formulation whose value is only found when the system fails. So, what is the cost of batch failure, product spoilage, laundry not being cleaned, reworking in a pulp mill, and so on Also, what is the target cost per dose for the chelant and related chemicals It is important to set acceptable limits on performance - for example, the formulated product needs to be stable for 6 months or show bleach stability >80% over the 30 min wash cycle. 

TEST MATERIAL. Material from one lot of standard mill produced 3/8 in. thick 5083-HI 13 (ASTM aluminum alloy designation GM41 A) plate was used for this investigation. The chemical analysis of the material fell within the limits established for this alloy and is shown in Table I. 

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