Employer Check.Part

In the construction of new plants and equipment, the employer is responsible that the equipment is suitable for the process application. Checks and inspections are performed to assure that equipment is installed properly, and consistent with design specifications and the manufacturer s instructions. Maintenance materials, instructions, spare parts and equipment will he available... 

By all means, employ defensive specification at appropriate interfaces in your system but make sure that the checking and exception handling are specified and documented as part of the interfaces and not just in the code. 

A useful procedure for checking if test pieces lie within certain limits of density is to prepare two liquids of different but known densities to be within the known limits a test piece must sink in one liquid and float in the other. This can be employed, for example, to rapidly sort parts made in two materials which have been mixed up. A further variation6 is titration of a heavier liquid into a lighter liquid until the test piece just floats, as given in ISO 1183-16. 

Surface preparations must be carefully controlled for reliable production of adhesive-bonded parts. If a chemical surface treatment is required, the process must be monitored for proper sequence, bath temperature, solution concentration, and contaminants. If sand or grit blasting is employed, the abrasive must be changed regularly. An adequate supply of clean wiping cloths for solvent cleaning is also mandatory. Checks should be made to determine if cleaning cloths or solvent containers have become contaminated. 

The original rs-method is based on equations presented by Kraitchman [4], He had noticed that the numerically dominant part of the inertial moment tensor for an isotopomer in which (exactly) one atom has been substituted, can be replaced by the known inertial moments of the parent molecule, and that the remainder of the tensor then depends only on the Cartesian coordinates of the substituted atom. Equating the roots of the secular equation for this hybrid tensor to the experimental inertial moments of the isotopomer, Kraitchman obtained his famous equations which, quite in contrast to any r0-type method, always aim at the determination of the Cartesian coordinates of just this one substituted atom. The rest of the molecule is irrelevant, it does not influence the result and need not be known. Costain has checked, for several small molecules, the invariance of -determined bond lengths when employing different pairs of parent molecule and isotopomer [7]. He found it superior to the comparable r0-data and recommended to prefer -structures for... 

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