Operator vessel

Heating or cooling of process fluids in a batch-operated vessel is common in the chemical process industries. The process is unsteady state in nature because the heat flow and/or the temperature vary with time at a fixed point. The time required for the heat transfer can be modified, by increasing the agitation of the batch fluid, the rate of circulation of the heat transfer medium in a jacket and/or coil, or the heat transfer area. Bondy and Lippa [45] and Dream [46] have compiled a collection of correlations of heat transfer coefficients in agitated vessels. Batch processes are sometimes disadvantageous because ... 

In the most useful form the test consists of a momentary injection of a known amount of inert tracer at the inlet of the operating vessel and monitoring of its concentration at the outlet. The data are used most conveniently in reduced form, as E — C/C0 in terms of tr — t/t, where... 

Visual external inspections (or in-service inspections) should be made regularly to operating vessels to help ensure the integrity of the vessel. The frequency of this inspection should... 

Because of liquid hydrogen s extreme cold temperature, the equipment design must be of materials that have suitable properties for cold temperature operation. Vessels and piping are designed to ASME code and piping standards for the pressure and temperatures involved. 

Visual external inspections (or in-service inspections) should be made regularly to operating vessels to help ensure the integrity of the vessel. The frequency of this inspection should be site-specific, between semiannually and once every three years for most chemical plant processes, depending on the aggressiveness of the chemical plant atmosphere. However, API 510 will accept intervals up to once every five years. 

Refer- ence Solida Voidage range Absolut density, lb per ou ft Particle-siss range, ft ifype of V pptexjtus operation Vessel dlsm., in. Height of heat-transfer area, in, Bed height in. Fluids Flow irai. lb / libr) (sq ft) Temp, F... 

The treatment or service cycle occurs across a mixed bed contained in the operator vessel. Upon termination of the service cycle all the resin is hydraulically transferred to a separation-regenerator vessel for separation by backwashing. Instead of adopting insitu regeneration in this vessel the anion resin is further physically transferred to another column for separate regeneration, whilst the cation resin is separately regenerated in the separation vessel. Finally, the cation resin is transferred to the anion vessel, air mixed, rinsed, and returned to the operator. 

Potential hydrocarbon losses from the overpressuring of operating vessels are controlled first by staged computer alerts and/or manual alarms to provide for correction of the condition. If the overpressure exceeds a second set point, pressure relief valves vent the vessel contents to a flare release system. The flare system provides a means of controlled burning of hydrocarbon vapors at a nonhazardous point to avoid fire or explosion risks. Smoke problems from flares are avoided by more efficient designs that use multiple nozzles and low pressure operation to promote clean combustion [57]. Greenhouse gas concerns should more frequently stimulate an interest in energy recovery options from flared hydrocarbons. 

During hospital stay Operative vessel injury Patient bied after laparoscopic gallbladder surgery and needed additional surgery to stop the bleeding... 

Type C reactions are considered as slow t. > 10 min). They are normally carried out in batch-wise operated vessels. Nevertheless, microstructured devices may be advantageous, if safety or product quality is an important issue. 

The greatest benefit of this technology is achieved if the steam-stripping operation is replaced by a progressive series of degassing operations, vessels and extruders, for cost reasons and to do away with water in the whole operation (17). 

Ives CL, Akoh JA, George J, Vaughan-Huxley E, Lawson H Pre-operative vessel mapping and early post-operative surveillance duplex scanning of arteriovenous fistulae. J Vase Access 2009 10 37-42. 

In cases of already operated vessels moved to the new shipping routes, the first opinion about port accessibility is given by the experienced ship master of a particular vessel. In case of a new vessel different methods should be applied. In all cases the opinion of local maritime pilots based on their experience and real time simulation trials performed by pilots is very important. 

Drums, exchangers, columns, and similar operating vessels that handle flammable materials and have a volume of more than 3,500 liters. 

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