Threading Subject

Threaded Joints Pipe with taper-pipe-thread ends (Fig. 10-128), per ANSI B2.1, is available 12 in and smaller, subject to minimum-wall limitations. Fittings and valves with taper-pipe-thread ends are available in most pipe metals. 

Steel forged fittings with screwed ends may be installed without pipe dope in the threads and seal-welded (Fig. 10-130) to secure bubble-tight joints with a minimum of welders labor. They are not subject to deformation by pipe wrenches, and such couplings, bushings, and plugs are often used with the screwed fittings below. 

The first process is the deformation of droplets into an ellipsoid, until the droplet breaks up. The second process is A droplet is, at high speed, extended into a thread, which is subject to instabilities (according to Rayleigh and Tomatika), and which, therefore, breaks up into a row of droplets (see MT 9.1.5). 

The diacid dichlorides used so far in rotaxane synthesis all have arene building blocks in common. Nevertheless, the initial amide bond formed between the dichloride and one stopper molecule (cf. 54) is thought to be responsible for successful molecular recognition of the semi-axle and the macromonocycle. Consequently olefinic and aliphatic diacid dichlorides 59a-g were subjected to the threading procedure to test the need for arene units (Figure 25). 

When the homologs of isophthaloyl dichloride 59 f and 59g are subjected to the threading procedure the situation is similar. 59 f leads to the corresponding rotaxane in 7% yield, whereas the homologous rotaxane 60g was only detectable by mass spectrometry [38]. 

In some cases the two methods may be used simultaneously. For instance, where it is possible to separate mechanically the threads of the warp from those of the weft and only the former are of mixed yam, these alone need be subjected to analysis by chemical means. 

Stopin. Russ for Squib. Also refers to an igniter for pyrot and some expl compns. It consists of cotton thread which has been soaked in a coned soln of K nitrate and then coated with a paste consisting of pulverin (see Vol 8, P496-R) in gum arabic. Finally, it is coated with dry pulverin and subjected to slow drying. Its burning rate is 3 to 5m/sec Ref Gorst (1957), 124... 

The set-up of this book is comparable to a spider s web. Ceramics are materials which can very well be described as the centre of the web. The threads of the web are the sciences which study ceramics geology, archeology, chemistry, physics, even medical and many other sciences. The material is excellently suited for use in technical, cross-curricular education. Consequently many curricular subjects will be dealt with in order to understand ceramics and all of its... 

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