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Graphic display of the underlying decision process involved in the introduction of a new product by a manufacturer.

Related Terms


A product from a manufacturing process that is not considered the principal material.


  1. The gas ionization that initiates current flow in a gas-discharge tube. 2. Excitation of a magnetron or transmit-receive tube by a pulse. 3. The transition from the unsaturated to the saturated state of a saturable reactor. 4. The act or process of adding fuel and air to a furnace. 5. Igniting an explosive mixture. 6. Treating a ceramic product with heat.


The use of a single chemical or refinery process unit alternately in more than one operation; for example, a catalytic reactor will first produce a chemical product and then will be blocked from the main process stream during catalyst regeneration.


  1. The quantity of material required for or produced by one operation. 2. An amount of material subjected to some unit chemical process or physical mixing process to make the final product substantially uniform.


The maximum percentage of defects that has been determined tolerable as a process average for a sampling plan during inspection or test of a product with respect to economic and functional requirements of the item. Abbreviated AQL.


[CHEMENG] Oil refinery catalytic process in which hydrogen is contacted with petroleum intermediate or product streams to remove impurities, such as oxygen, sulfur, nitrodirect indication of the amount of moisture in the air or other gas, the indication usually being in terms of relative humidity as a percentage which the moisture present bears to the maximum amount of moisture that could be present at the location temperature without condensation taking place.


A fixed-bed, vapor-phase petroleum-refinery process using a precious-metal catalyst and external hydrogen; feedstocks include natural gas, pentane, and hexane cuts; the product is highoctane blending stock.


A mass-production arrangement whereby the work in process is progressively transferred from one operation to the next until the product is assembled.


The unfinished product taken from a stage of a refinery process and recharged to the process at an earlier stage in the operation.


Flow of fluid product out of a process facility.

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