Casing grades

The selected coupling should be long with round thread. The available casing grade is N-80 and unit weights as given in table below. 

The US appearance offull-thickness tears depends on the amount of joint effusion. When a large effusion is present, the tear appears as a focal hypoe-choic area due to the fluid that fills in the tendon discontinuity (Figs. 6.80,6.81). In these cases, graded pressure with the probe may be helpful to distinguish the hypoechoic fluid from the tendon. When... 

Casing joints are available in different grades, depending on the expected loads to which the string will be exposed during running, and the lifetime of the well. The main criteria for casing selection are ... 

The anisotropic sintered form is by far the most important one. It is produced in various grades which can be divided into four main groups. Group is used for loudspeakers, where a high is essential, whereas a relatively low is acceptable. Groups F —are used for different types of motors, requiring quite distinct levels. In these cases a high is also desired, but in fact it is limited by the level and the performance factor K. 

Figure 9 shows typical demagnetization curves for the materials of Table 8 (104,105). A material group may include more than one grade. In that case the values for the two extreme iC-values are given. 

Certain grades of siUca gel or selected clay minerals are often used. The buffeting material is preconditioned under the selected relative humidity and, after equihbration, installed in the case. This method of microclimate control has proven to be very efficient, not only in exhibition cases and storage spaces, but also in packing crates used for the transportation of sensitive objects. 

In addition, there are other methods of manufacture of cryoHte from low fluorine value sources, eg, the effluent gases from phosphate plants or from low grade fluorspar. In the former case, making use of the fluorosiHcic acid, the siHca is separated by precipitation with ammonia, and the ammonium fluoride solution is added to a solution of sodium sulfate and aluminum sulfate at 60—90°C to precipitate cryoHte (26,27) ... 

Rigid paperboard containers are made of paper greater than 0.254 mm (0.010 in) in caUper and include folding cartons, cormgated ftberboard cases, and spiral wound composite cans. Many paperboard cartons require the use of inner liners or overwraps, made of protective grades of paper, plastic, or aluminum foil laminations. 

Aqueous solutions of propylene glycol display excellent antifree2e properties and are therefore valuable as low temperature heat-transfer fluids. For apphcations involving indirect food contact, heat-transfer fluids formulated with the USP grade product are preferred, since there could be inadvertent contact with a food product. These fluids are commonly used in the brewing and dairy industries as well as in refrigerated display cases in retail grocery stores. 

Oil viscosity grades have also been developed with suitable additives for use in a variety of specific appHcations in two-cycle engines, refrigeration and air conditioning, oil mist lubricators, low outdoor temperatures, instmments, and office machines as partially reflected in Table 3. Equipment manufacturers and lubricant suppHers provide recommendations for individual cases. 

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