Weight-loss methods

The method can detect low corrosion rates that would take a long time to detect with weight-loss methods. 

D 2688 1983 Test method for corrosivity of water in the absence of heat transfer (weight loss methods)... 

Met. = Method. C = chronocoulometry, CC = corrosion current method, EC = Electrocapillary method, EL = Ellipsometric method, IR = Infrared spectroscopic method, CV = cychc voltammetry, RT = Radiotracer method, T = Tensammetry, TF = Thin film resistance, WL = weight loss method. When a combination of methods was used aU methods are listed separated by slashes. See also list of symbols. 

Finally, one variation on the weight-loss method— Fuel hose testing modified GM 9061 fill and plug method —applies for fuel line aspects of fuel containment—here the sample can be from an actual hose or its liner. 

The most common method of corrosion monitoring is the direct weight loss method, via small metal coupons. In addition, there are a number of electrical methods, including developed potential measurement,... 

ASTM. D2688-90 Standard Test Methods for Corrosivity of Water in the Absence of Heat Transfer (Weight Loss Methods). ASTM, USA, 1990. 

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It may sound simple, but it s true Happiness starts with taking care of your physical and mental health. Using diet pills or any other unhealthy weight loss method does exactly the opposite. The most important step people can take in becoming healthier is to become happy with who they are right now. 

This weight loss method is seen by engineers as real (representing the overall result of corrosion, however it occurs). The long times involved represent reality more than do short time measurements (see Method 2), which might be expected over many years in a practical situation. 

Calibration is the largest source of error in the measurements. N0a permeation rates were determined by the rate of weight loss. Neighing errors amount to + 2%. The uncertainty in the NO/Oa titration method used to check the weight loss method is about 5%. Additional calibration errors of + 2% are caused by temperature variations of the permeation devices. 

Weight Loss. Of all the methods the weight loss method is the most simple, requiring only the calculation of the difference in weight as a function of time. However, the method also has some serious disadvantages, the major one being that no qualitative information can be obtained about the active ingredient. 

Meniscus Regression. The meniscus regression method is comparable to the weight loss method in its simplicity and rapidity. The increase in the length of the void space between the open end of the hollow fiber and the meniscus of the column of liquid is measured periodically using a Wilder Varibeam optical comparator which has been described by Weatherston et. al. (3). Since this instrument can also be used to measure tFe internal diameter of the fiber, the volume and therefore the weight of material lost can be calculated as a function of time. 

Marx and Petzel [92MAR/PET] measured the total pressure of the vapour in equilibrium with stoichiometric CaSe(cr) in the temperature range 1832 to 2138 K using the Knudsen effusion weight-loss method. The vapour was assumed to predominantly contain Ca(g) and Se(g) based on results from calculations using estimated thermodynamic properties of CaSe(g). The enthalpy change for the reaction... 

The Zn corrosion products in the dew represent only the soluble corrosion products. Information on the insoluble corrosion products was obtained only in the C3H6/NOX experiment in which weight loss determinations were made. It was found that the total Zn corrosion determined by the weight loss method was larger than that found in the dew and rinse. The difference is equal to the amount of insoluble corrosion product formed. 

The second indirect method is by measurement of the weight of ethylene oxide delivered from the feed containers to the sterilizer. This method assumes no leakage, liquefaction, or polymerization of ethylene oxide in the gas tines connecting the gas source to the sterilizer. It is recommended that the two indirect methods be used in conjunction with each other. The weight loss method ensures that the increase in pressure is in fact due to gas from the ethylene oxide feed container and not from diluent gas or some other source whereas the pressure method provides an ongoing index of gas concentration during the exposure period. Gas makeups should be automated and specified to be drawn from the ethylene oxide feed tanks, not from the diluent gas. Gas makeup may be controlled by pressure switches or by pressure transducers connected to solenoid valves controlling gas flow. 

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