Dog legs

Slipping through clamps, improper seizing, improper socketing or splicing, kinks, dog legs, and core popping. 

T = weight of drill pipe suspended below the dog-leg in lb I = drill pipe moment of inertia with respect to its diameter in in. ... 

Key seats occur in dog legs of the borehole. The drill pipes cut a groove in the wall at their dimension and when tool joints or drill collars are pulled up, the drillstring gets stuck. 

Lubinski, A., Maximum permissible dog-legs in rotary boreholes,"/oj/rnaZ of Petroleum Technology, February 1961. 

A. Nicholson, R. W., Minimize drill pipe damage and hole problems. Follow acceptable dog-leg severity limits, transactions of the 1974 lADC Rotary Drilling Conference. 

The path that the diffusing atom takes will depend upon the structure of the crystal. For example, the 100 planes of the face-centered cubic structure of elements such as copper are identical to that drawn in Figure 5.7. Direct diffusion of a tracer atom along the cubic axes by vacancy diffusion will require that the moving atom must squeeze between two other atoms. It is more likely that the actual path will be a dog-leg, in <110> directions, shown as a dashed line on Figure 5.7. 

Expansion joints (bellows) were used on each end of pipe in a dog-leg without adequate support, contrary to the recommendations of the manufacturer. 

REE patterns of metamorphic monazite (Figs. 3b,e) have negative slopes, sometimes with a negative Eu anomaly. Xenotime shows a dog leg pattern with a positive slope through the MREEs and flat in the HREEs (Figs. 3c,f). 

Check the surface of clutch hoes, no surface cracking, oil leakage and dog leg is allowed, use the split washer and spring clip to fix the clutch hose on the support frame of car body. 

The name dogieg comes from the fact that the piecewise has a vague resemblance to a dog leg. 

This process would have been very noisy because the bellows burst and the dog-leg pipe buckles sending the overhead scaffolding upwards. There would have additionally been the development of a roar due to the massive two-phase discharges from both R4 and the B4 end of the pinched pipe bridge and the rumbling of the boiling of the superheated... 

Batstone, R. 1. 1975. Description and Results of Bellows Test Program and 2(f Dog Leg Pipe Tests, Cremer and Warner Report No. 7, lanuary 7. 

The baffle disc can experience considerable axial forces, and thus a substantial thickness needs to be used with good welding where it crosses the flight. In some instances a dog-leg is used where the disc is attached to the flight. This can produce unwanted paddling of cake, by virtue of the axial component of the dog-leg. 

A plant modification occurred without a full HAZOP assessment of the potential consequences. Only limited calculations were undertaken on the integrity of the bypass line. No calculations were undertaken for the dog-legged shaped line or for the bellows. No drawing of the proposed modification was produced >- With regard to the use of flexible pipes no pressure... 

Are there dog legs in film co-extrusion feed pipes ... 

Polysulphones may be formally expected to have regular and linear structures, but in fact most types contain a kink or dog-leg which inhibits crystallization. This similarity exists in the polycarbonates, and it is presumed that the reluctance to crystallize is related to similar structural features. 

Two straight lines give the best fit to the points in the Type I-diagram (Figure 15.8). The interpretation is that there are two different distributions for the accidents with a short and long period of absence respectively. This type of diagram is called dog leg and indicates that the accidents with a short and long period of absence have different causes. 

The accident happened when the plant had to replace one of six reactors and rushed to refit the plant to bypass the disabled reactor. Scaffolding was jerry-rigged to support a 20-inch pipe connecting reactor four with reactor six, which violated industry and the manufacturer s recommendations. The reactor that failed showed stress crack corrosion. The only drawings for the repair were in chalk on the machine shop floor. Both ends of the 20-inch pipe had expansion joints where they attached to the reactors. The pipe was supported on scaffolding-type supports and was offset with a dog-leg to fit the reactors, which were at different levels to promote gravity flow. The safety reviews, if any, were insufficient. 

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