Spring Cleaning

Example 62 If a manufacturing process involves two raw materials, each defined by three sets of specification limits, and four pieces of equipment with one control knob, then a complete validation protocol would ask for (Three settings Lo, Target, Hi) (2 materials 3 specs + 4 machines 1 control) = 3 = 59 000 experiments, even without repetitions. This product would never reach the market if one did not employ experience and scientific rationale to simplify development by testing only the presumed critical issues, say a total of three specification points for 3 = 27 experiments. 

Since both the manufacturer and his suppliers are forced to work by the same strategy, each company s raw materials QC and finished product QC laboratories test only for the most obvious characteristics. An undetected change in a raw material s properties might change a product characteristic that could also go unnoticed until much later. 

PRODUCT BFG.xls consists of the chemist s table, a reduced table obtained by casting out data that is not ammenable to statistical analysis such as subjective assessments ( off-white color, characteristic crystal form, pungent smell STEP 1), and the final table that was freed of all inconsistencies by going back to the original data (STEP 2). Various interesting items are highlighted  

The items and the appropriate dimensions and specifications are given in the first three columns. 

In the two rows for TLC, the legends total impurities and single impurity are reversed. 

Appearance White to almost Almost white, Almost white. Almost white. idem Almost white 

Odor Odorless or Almost odor- Almost odor- Almost odor- idem Almost odor- 

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To remove airborne dust, allergens, and odors from a room, remove the hose and leave the vacuum on for 15 minutes with the doors shut. This is a great practice after a big spring cleaning or if you ve had a smoker in the house. Caution Don t leave the vacuum on for extended periods, as you risk burning out the motor or starting a Are. 

S. Spring, Industrial Cleaning, Prism Press, Melbourne, AustraHa, 1974. 

Pneumatic controllers are made of Bourdon tubes, bellows, diaphragms, springs, levers, cams, and other fundamental transducers to accomplish the control function. If operated on clean, diy plant air, they offer good performance and are extremely reliable. Pneumatic controllers are available with one or two stages of pneumatic amphfi-cation, with the two-stage designs having faster dynamic response characteristics. 

This type of seal has the rotary component and face mounted outside the seal chamber. The springs and drive elements are outside the pumped liquid. This reduces the problems associated with corrosion and the accumulation of pumped product clogging the springs. This seal is popular in the food processing industry. The pumped liquid arrives to the inside diameter of the faces and seals toward the outside diameter. The environment outside the pump approaches the OD of the face union. Pressures are limited to about 35 psig. Sometimes this. seal can be mounted either inside or outside the pump. This seal is easy to install, adjust, and maintain. It permits easy access and cleaning of the pump internal parts, often required in the food processing industry. 

The slurry seal with the evacuation line is designed to handle/evacuate suspended solids, crystals, sediment, and dirt in the pumpage. The seal s springs are located out of the fluid. The o-rings move and rub across a clean surface as the faces wear. The o-rings are placed away from the heat generated by the faces. 

The decision was made to take a shutdown that spring to clean the water side of critical coolers. The following summer we were glad that we had done so. 

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