Foreign object

NDT-testing of parts and units. Correctness of assemblage of parts and foreign object detection. 

Impediments to water flow resulting from inadequate equipment design or lodgement of foreign objects in the tubes can exercise a dramatic effect on the erosion-corrosion process. Much of this influence is linked to the creation of turbulence and the simple increase in fluid velocity past obstructions. The importance of these factors is quickly recognized when the phenomenon of threshold velocity is considered. 

No damaging interference to foreign objects has to be considered in cathodic protection with galvanic anodes because of the small current densities in soil and the lower anode voltages. 

Prevention of Electrical Contact with Foreign Objects... 

A leaky check valve, a foreign object lodged under a check valve, or a leaky piston. 

Inlet startup screens have been recommended for other compressors covereii in the earlier chapters. If the point has not been made yet. n should be with the axial compressors. Considering that most of the cost of the compressor is in the hundreds of vulnerable blades just waiting to be hit by some foreign object, it should be obvious that some protection is needed until the piping has been proven to be clear and clean. 

Broken bit components left behind in a borehole when the drillstring is removed and hand tools and other foreign objects falling in the borehole constitute Junk that must be retrieved. These components cannot be drilled up during normal drilling operations. They may be milled with metal drilling bits and other special apparatus that can eventually remove these items in pieces. Such Junk items can be very difficult to remove. 

Vibration analysis is useful as a diagnostic tool for locating loose or foreign objects in process lines or vessels. This technique has been used with great success by the nuclear power industry and it offers the same benefits to non-nuclear industries. 

Cause of failure Tensile breaks caused by high shock loads, foreign objects lodged under the belt, or damage sustained during installation (Figure 58.15). 

A foreign object, such as a piece of refractory, partially obstructing the flow of catalyst in the standpipe. 

A foreign object has pertielly restricted flow of Catalyst in Standpipe... 

Hydrophobically modified HA derivatives,91 obtained through the partial esterification of the HA carboxyl groups with methylprednisolone (45% in HYCp45 and 60% in HYCp60),92 have been deeply studied 93 A key point prior to any in vivo study of the biomaterial is the assessment of the so-called "stealth character" of the species itself. Such characteristic corresponds to be invisible towards the immune system, so that colloids are not recognized as foreign objects by body fluid components, as plasma proteins fibrinogen, BSA and lipidic components.94,95... 

In addition to laboratory blood analyzers and portable point-of-care devices, which require blood collection, continuous monitoring of ion activities in a blood stream via implanted ion-selective electrodes is of great interest. The term biocompatibility refers to the ability of a sensor not to cause toxic or injurious effects while being in contact with living tissue. As dealing with any foreign object introduced into the human body, biocompatibility and hemocompatibility particularly are the most important requirements. 

The first aspect of biocompatibility is a natural immune response. When a foreign object enters the blood stream, it can be attacked by the body s defense system. The first step is protein adsorption on an object surface. It is believed that the amount and type of protein adsorption is one of the most important steps determining whether the object is tolerated or rejected by the body. The next step is cell adhesion, which may cause aggregation and activation of platelets and triggering of the blood coagulation system with resulting thrombus formation. It may not only lead to sensor failure via surface blocking but directly threatens the patient s health. 

Together with the known positions of the chain segments and the order along the chain, we can deduce that the central region in the bilayer is slightly more disordered than the outer part of the core. Such a result is relevant for the mechanism of incorporation of foreign objects in the bilayer. 

Foreign object caught between agitator and tank wall... 

Consider materials such as air, water, oil, or foreign objects that could be left inside equipment during cleaning or maintenance operations. Physical processing conditions, such as temperature, pressure, humidity, and oxygen content should also be considered. 

Objective 4. Demonstrate the ability of grinding equipment to safely process foreign objects such as detached antiresonance rods and igniter cables. 

Pools of residues of chemicals or materials Completed products and chemicals Foreign objects... 

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