Hydrogenations controlled

Hydrogen Controlled Electrode a covered electrode which, when used correctly, produces less than a specified amount of diffusible hydrogen in the weld deposit. 

The presence ot hydrogen, controlling the mean length of macromolecules, amplifies the kinetic scheme by reactions (14)—(16). Equation (122) assumes the form... 

Scully, J.R. and Young, G.A., Jr., The effects of temper, test temperature, and alloyed copper on the hydrogen-controlled crack growth rate of an Al-Zn-Mg-(Cu) alloy, in Corrosion 2000, National Association of Corrosion Engineers, Houston, TX, 2000, paper 368. 

Manual metal-arc electrodes of hydrogen controlled type unless established as low or very low... 

Hydrogen control. The necessity in hydrogen control was caused by the need for detection of water leak into sodium resulting in the following reaction ... 

The usual practice for the process operator is to determine the refractive index of a sample of the oil during hydrogenation, since this can be done in a few minutes, on site. It correlates well with the iodine value of the oil and also the solid fat index. If a hydrogen gas meter is available, this will have been set at a precalculated amount of gas at which to stop the reaction for determination of the refractive index. Calculation of the amount of gas required is based on the stoichiometry of hydrogenation (Mattil 1964). When the desired refractive index is reached, the batch is cooled for filtration and the solid fat index is determined in the laboratory. This is by far the most important analysis method in hydrogenation control. Typical solid fat indices for selectively and nonselectively hydrogenated canola oil are given in Table IV (Teasdale, 1975). 

SAFETY REVIEW CONSIDERATION — ANALYSIS OF HYDROGEN CONTROL... 

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