Remaining life

In mechanistic studies of stress corrosion and also in the collection of data for remaining-life predictions for plant there is need for stress-corrosion crack velocity measurements to be made. In the simplest way these can be made by microscopic measurement at the conclusion of tests, the assumption being made that the velocity is constant throughout the period of exposure, or, if the crack is visible during the test, in situ measurements may be made by visual observation, the difficulty then being that it is assumed that the crack visible at a surface is representative of the behaviour below the surface. Indirect measurements must frequently be resorted to, and these... 

Prediction of the useful life, or the remaining life, of coatings from physical or analytical measurements presents many problems in data analysis and interpretation. Two important considerations are that data must be taken over a long period of time, and the scatter from typical paint tests is large. These considerations require innovative application of statistical techniques to provide adequate prediction of the response variables of interest. 

This method may only be used on new acquisitions. There are two accepted variations the total-life plan and the remaining-life plan. 

In the remaining-life plan the depreciation for any year is the book value reduced by an acceptable salvage value times a fraction. The numerator of the fraction, as before, is the number of years of useful life remaining. The denominator is the sum of the digits from one to the number of years of useful life remaining. For this plan the denominator is not a constant. 

Determine the depreciation per year for Example 1 1-4 using the sum of the years digits remaining-life plan. 

After safety has been built into the process, it must be maintained throughout the remaining life cycle stages of the process, beginning with facility startup and operation. 

Recently, a method for predicting the remanent life of a reinforcing geotextile was proposed [1] in which the strain to failure of a sacrificial sample was divided by the current creep rate. This requires verification. However, very few methods have so far been proposed or used for monitoring plastics in service and at the same time providing a numerical prediction of their remaining life. The reason for this is not just that the methods are likely to be expensive and complicated, but that there are few applications of plastics which can compete in risk and replacement cost with a high temperature boiler or aircraft structure. 

The total life as per this interpolation formula was found to be about 15 years and the remaining life was predicted as 5 years. 

The second conclusion is based on the fact, that as soon as a star enters the Wolf-Rayet phase, its remaining life-time 1s extremely short (a few 10 years), simply because of the high mass-loss rate. Hence, Its total life-time is mainly determined by its age at the onset of the high mass-loss rate. If a star enters the Wolf-Rayet phase very early, or even at zero age, it cannot exist longer than the very massive stars, regardless of its initial mass. 

Due to its lower viscosity and other factors, gas flows through the reservoir more readily than oil. Producing gas-oil ratio will increase throughout most of the remaining life of the reservoir. Just before abandonment, when reservoir pressure is very low, producing gas-oil ratio will decline. 

It may be anticipated that the antioxidant consumption during use leads to a shorter remaining life-time and that it is necessary to add more. Recycled plastics suffer from the consequences of degradation during processing and first-life application. This leads to the introduction of new functional groups, which in particular for oxidisable polymers such as PE, enhance the sensitivity of the recyclate to thermal- and photo-degradation. With the formation of new pro-oxidative moieties, a substantial part of the stabilisers are simultaneously consumed [14]. 

None of the curves drawn in Figure 8 have a discontinuous point. The figure reveals that the correlation in the results from the start to the end of the runs between the pilot and commercial units is considerably improved from that in Figure 7. The figure can be used for predicting the remaining life of the catalyst system, because the deactivation of the catalyst system at the end of the commercial run can be estimated. 

B. caballi can be treated effectively but there is not a comparable chemotherapeutic approach to the treatment of B. equi, where drugs may control the clinical signs of infection but horses often remain life-long carriers. In regions where piroplasmosis is endemic, elimination of the infection may not be desirable because these horses will then be susceptible to reinfection. In these areas, premunition is used the horses are infected or allowed to become infected and are then treated with sufficient chemotherapy to control the clinical signs but not to eliminate the infection. Horses that have been premunised are thus infected but not affected. This technique permits the development of the carrier state and as a result some resistance (immunity) to reinfection. 

Plotting the results of analyses performed on used Pd-Al203 catalysts, a correlation has been found between residual hydrogenation activity and the amount of Si present on the sample (see Figure 4). This correlation facilitates estimating the remaining life of a catalyst when its level of Si poisoning is known. 

Avila, S.M. Horvath, D.A. Microscopic void detection as a prelude to predicting remaining life in electric cable insulation. International Topical Meeting on Nuclear Plant Instrumentation, Controls and Human-Machine Interface Technologies (NPIC HMIT 2000), Washington, DC, Nov 2000. 

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