Test sections

Weld scanning within the test section (scanned areas are "painted black")... 

Moving the airborne sound receiver to the next test section... 

With some acids (e.g., succinic acid and sulplianilic acid) more satisfactory results are obtained by reversing the order of mixing, i.e., by adding the solution of the so um salt of the acid to the reagent. It should be pointed out that the melting points of the derivatives as determined on the electric hot plate (Fig. II, 11, 1) may differ by 2-3° from those obtained by the capillary tube method. In view of the proximity of the melting points of the derivatives of many acids, the mixed m.p. test (Section 1,17) should be applied. 

A manufacturing technology to produce very small encapsulated phase-change materials has been developed (47). These encapsulated phase-change materials were appHed in a convective heat-transfer test section, and a 50—100% higher heat-transfer coefficient was reported. 

The existing ground mbber producers have expanded their capacity to meet anticipated demands. Potential new entrants have been forced to decide whether to go ahead with investment plans, or await a final Congressional verdict. State transportation department groups that lead the anti-Section 1038 faction are also deciding whether to proceed with test sections and other preparations for implementing the requirement. 

Another way to study corrosion in pipe lines is to install in the line short sections of pipe of the materials to be tested. These test sections should be insulated from each other and from the rest of the piping system by means of nonmetalhc couphngs. It is also good prac-tice to provide insulating gaskets between the ends of the pipe specimens where they meet inside the couplings. Such joints may be sealed with various types of dope or cement. It is desirable in such cases to paint the outside of the specimens so as to confine corrosion to the inner surface. 

This test is covered under field tests. Section 14.5(4). 

For impulse withstand voltages across the contact gaps of an interrupting device, refer to lEC 60694 and lEC 60298, Wet or dew test is a weatherproof test (Section I4..5.I0) and is meant for outdoor assemblies. 

Power frequency tests after erection at site, if required, may be conducted at 15% of the values indicated above. Also refer to field tests (Section 14,5, Table 14,8),... 

This test is applicable to all outdoor parts of any bus system and on both indoor and outdoor parts of an isolated phase bus (IPB) system. Each enclosure to be tested (such as the enclosure of one phase in an isolated phase bus system) should be complete in all respects with all its fittings and mounts in place. The length of the testpiece must be the same as that considered for the temperature rise test (Section 32.3.4). 

The tracer is injected into the duct at a constant rate and mixed with the flowing air. The concentration of the air-tracer mixture is measured further downstream. Assuming perfect mixing and that the air entering the test section has a zero concentration, the air volume flow rate can be calculated based on the mass balance of the tracer... 

It is for this reason that the details given in the monographs are, on the one hand, obtained by reviewing the literature while, on the other hand, the "Procedure Tested" section reports the results we ourselves obtained, which are not necessarily in complete agreement with the literature reports. 

Fracture Mechanics Tests One problem of both sustained load and slow strain-rate tests is that they do not provide a means of predicting the behaviour of components containing defects (other than the inherent defect associated with the notch in a sustained load test). Fracture mechanics provides a basis for such tests (Section 8.9), and measurements of crack velocity as a function of stress intensity factor, K, are widely used. A typical graph of crack velocity as a function of K is shown in Fig. 8.48. Several regions may be seen on this curve. At low stress intensity factors no crack growth is... 

It should be stressed that there must not be a significant difference between the precisions of the methods. Hence the F-test (Section 4.12) is applied prior to using the -test in equation (5). 

The 4 1 complex has square planar coordination of platinum (Pt-S 2.317— 2.321 A) similar bond lengths are found in the corresponding complex with 1,4-thioxane [120]. Complexes with thiourea are important in Kurnakov s test (section 3.8.2) Pdtu4Cl2 has square planar coordination (Pd—S 2.33 A). 

In burn-out experiments, a test section is part of a loop which may be open or closed, and the question arises as to whether or not any of the loop equipment, such as condensers, heaters, pumps, or pipe fittings, have any significant effect on the burn-out flux. This issue came to prominence at the Boulder Heat Transfer Conference in 1961 with a Russian paper by Aladyev (A4) describing burn-out experiments in which a branch pipe, connecting to a small vessel, was fitted close to the test section inlet. The test section itself was a uniformly heated tube 8 mm in diameter and 16 cm long. The results are reproduced in Fig. 9, and show burn-out flux plotted against exit steam quality. Curve (A) was obtained with the branch vessel filled with cold water,... 

Many experimenters have adopted the practice of feeding a preformed mixture of steam and water to their test sections, either out of interest in this type of system or else to avoid the power demanded by long channels. The CISE Laboratories in Italy have produced a considerable amount of data of this kind (S4), and a typical example of their results is shown in Fig. 13. The curves have a characteristic swan-neck shape similar to the Russian data for unstable flow conditions shown in Fig. 9, and the burn-out flux values are generally below those for normal steady-flow conditions. 

The wall thickness of a heated test section depends on the resistivity of the material used and on the electrical supply available. Since these factors... 

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