Rotary slips

Rotary slips Wedging devices used to clamp the tool string into the rotary table. The wedging action is provided by friction. 

With the 3 in. pipe rams closed on the 3 in. drill pipe, open rotating head and pull the rotary bushings. While stripping with the pipe rams, raise the liner string (with the 3 in. drill pipe) until the 4 in. stripper rubber and the drill pipe joint it is on are above the rotary table. Replace the rotary table bushings and, using the rotary slips, remove this drill pipe Joint with the 4 in. stripper rubber (the 4 in. stripper rubber can be removed from this joint later). 

Pick up a joint of 3 in. drill pipe with a 3 in. stripper rubber attached. Make up this 3 in. drill pipe joint to the liner string s upper drill pipe joint being held in the rotary slips. 

Volumetric efficiency is determined by the tip leakage past the rotors, not unlike the rotary screw compressor. The leakage is referred to as slip. 

S" = Slip, quantity of fluid that leaks through internal clearances of rotary pump per unit time, GPM SpGr = Specific graHty of liquid at pumping temperature referred to water =1.0 s = Stroke, in. 

The capacity of a rotary pump operating with zero slip is called displacement capacity, q (gpm). Thus, the actual capacity of a rotary pump q (gpm) is... 

Slipping and Cutoff Practice for Rotary Drilling Lines... 

The rotary table (Figure 4-95) provides the rotary movement to the kelly. The master bushing of the rotary table encases the kelly bushing or pipe slips, as... 

Figure 4 96. Rotary table with square drive bushings and slips [13],...

Open the blind rams, and continue to lower the 4 in. liner through the rotary table opening using the casing slips. 

Performance of a rotary positive-displacement compressor can be evaluated using the same criteria as a positive-displacement pump. As constant-volume machines, performance is determined by rotation speed, internal slip, and total back-pressure on the compressor. 

The liquid levels of products that have a Reid vapor pressure of 40 lb or more are generally determined by the use of gauge glasses, rotary or slip-tube gauges, tapes and bobs through pressure locks, or other types of gauging equipment. The type of gauging equipment depends on the size and type of the pressure tank. 

The DIN method is given in ISO 464954. The principle of the machine is illustrated in Figure 11.5 a disc test piece in a suitable holder is traversed across a rotating drum covered with a sheet of the abradant, which is why it is also called the rotary drum abrader. In this way, there is a relatively large area of abradant, each part of which is passed over in turn by the test piece, so that wear of the abradant is uniform and relatively slow. In the standard method there is no provision for changing conditions from those specified, other than a lower force for soft rubbers, but it would be possible to use other abradant cloths or papers and to vary the force on the test piece. The degree of slip is 100% and it would be inconvenient to test in the presence of a lubricant. Although not versatile, the method is very convenient and rapid and well suited to quality control. 

The rotary-platform, double-head or Taber abrader, unlike those mentioned above, was not developed by the rubber industry but was intended for very general use. It is of the form (d) in Figure 11.4 but uses a pair of abrasive wheels. Although the degree of slip cannot be varied, the Taber is in other ways a very versatile apparatus. It uses a simple flat disc as the test piece which could, if necessary, be fabricated from more than one piece. The force on the test piece and the nature of the abradant are very readily varied and tests can be carried out in the presence of liquid or powder lubricants. When using the usual type of abrasive wheel, a refacing procedure is carried out before each material tested. 

The semisolid consistency and the occurrence of slip effects during flow could limit the use of the rotary clamp method, the conveigent flow method or even Sridhar s extensional rheometer for a large number of food products such as mayonnaises and salad dressings. A novel rheometer (15) based on the concept of filament stretching has been developed by Plucinski et al (Fig. 10) to measure the extensional properties... 

The developed model for the simulation of the dynamic flow rate in a rotary kiln has been validated for varied experimental conditions filling phases, transient responses after a step in the rotation speed or in the feed rate (not presented here). It is shown that this dynamic model, based on the Sae-man equation developed for rolling mode, works with the slipping mode too the replacement of the angle of repose by the wall friction angle is sufficient. 

A rotary pump handles 8000-SSU liquid containing 5% entrained gas and 10% dissolved gas at a 20-in(508-mm)Hg pump inlet vacuum. The pump is rated at 1000 gal/min (63.1 L/s) when handling gas-free liquids at viscosities less than 600 SSU. What is the output of this pump without slip With 10 percent slip ... 

Compute the effect of slip on the pump output. Slip reduces rotary-pump output in direct proportion to the slip. Thus, with 10 percent slip, the output of this pump is (444 gal/min)(1.0 — 0.10) = 399.6 gal/min (25 L/s). 

Furniture fabrics are back-coated with non-slip finishes, often with polymer-based ones. The formulation may include thickeners and flame retardants. Back-coating is mostly achieved by nip-padding or using a doctor (squeegee) or by foam application or spray techniques (for a lower add-on). Another one-side application is rotary printing (screens with regular perforation). 

There are basically two approaches in stretch wrapping turntable and overhead rotary arm. The turntable stretch wrap system is accomplished by rotating the load on a mechanically driven platform and applying multiple layers of film. With overhead rotary arm systems, the unit load remains stationary and the film application unit spirals around the load. On some units, a top platen can also be added to the rotary arm system to ensure that cases and the top slip sheet on a bulk pack remain stable during the stretch wrap operation. 

Instrumentation of rotary presses is more difficult than that for an excentric press if transducers are to be fitted directly to the punches. Since the turret of the press rotates, a fixed connection between transducers and the recording device is impracticable. Alternatives to fixed connections are slip rings and radiotelemetry. A further option is to fit transducers to points of the press remote from the punches and... 

Punch displacement measurements are easily done on a single station press by attaching LVDT to the punch. On a rotary press, such measurements can be done by means of slip ring, telemetry, or instrumented punch. Punch displacement profiles may be used in conjunction with compression force to estimate work of compression and work of expansion (measure of elasticity). Because capping tendency increases with the punch penetration depth, it may be desirable to monitor actual punch movement into the die. The shape of a force-displacement curve is an indication of the relative elasticity or plasticity of the material whereas plastic deformation is desirable for stronger tablets, excess plasticity usually results in tablets that tend to cap and laminate. ... 

The rheological properties of slips are usually measured by rotary viscomete while capillary viscometers are used for routine checks. 

Taber Abrasion Resistance - The weight loss of a plastic or other material specimen after it was subjected to abrasion in a Taber abraser for a prescribed number of specimen disk rotations, usually 1000. A Taber abraser consists of an idling abrasive wheel, designated depending on the type and grit of abrasive used as CS-lOF, H 22, etc., and a rotary disk with the specimen mounted on it. The load is applied to the wheel. The produced motion simulates that of rolling with slip. 

The objechve of all NO confrol fechnologies is to reach a high NO reduchon wifh a minimum consumpfion of fhe reducfanf, while fhe ammonia slip musf be kept low. Selective noncatalyhc reduction (SNCR) is typically applied in cement rotary kilns where a flue gas optimum femperafure window of 900°C-1100°C is identified, which serves to initiate fhe breakdown of urea solution to form fransienf species wifch lead to effective NO reduction. 

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