Charging pump

Thermal-Hydraulic Analysis must be extended to at least 24 hours into the accident. This study used calculations for feed-and-bleed operation with a charging pump, and with gravity teed from the refueling water storage tank (RWST),... 

When a desirable suction condition cannot be attained, a charging pump becomes necessary. This is a common solution used on many modern rigs. 

Most refineries produce sufficient gas oil to meet the cat crackers demand. However, in those refineries in which the gas oil produced does not meet the cat cracker capacity, it may be economical to supplement feed by purchasing FCC feedstocks or blending some residue. The refinery-produced gas oil and any supplemental FCC feedstocks are generally combined and sent to a surge drum, which provides a steady flow of feed to the charge pumps. This drum can also separate any water or vapor that may be in the feedstocks. 

Filtration Process with a Centrifugal Charge Pump... 

Assure that consolidated ice at the bottom of the column does not back up to inlet lines or charge pump. 

The essential equipment requirements for a tetramer unit are a combined feed-charge drum, charge pump, catalyst chamber, depropanizer, recycle column, rerun column, and attendant pumps and exchangers. Figure 1 shows such a unit as designed to produce tetramer and cumene alternatively. Table VII shows yields from the tetramer operation when a 350°-485°F. boiling-range tetramer is produced. 

Extension of this procedure to the ion relaxation N1 (t) is not as straightforward. The rate of charge pumping (3.432) is maximal immediately after 8-pulse excitation, but changes and turns to zero very soon. Since the stationary pumping consists of the infinite sequence of such events, the source term is actually the sum of them, which can be obtained by application of the same convolution procedure as in Eq. (3.437) ... 

Filtration Process with a Centrifugal Charge Pump A filter press with a surface of 51Din%andles a slurry with these properties ... 

Filtration Process with a Centrifiigal Charge Pump 311... 

Here Sag denotes the 2N x 2N scattering matrix of the system. Note that the index 3 in this case is summed over the modes in both lead 1 and lead 2, since electrons can be incident from either lead. In our NS junction, the charge pumped into the right lead is converted into a supercurrent. 

Note There are some other capacitor-based possibilities — in particular charge pumps — also called inductor-less switching regulators. These are usually restricted to rather low powers and produce output rails that are rather crudely regulated multiples of the input rail. In this book, we are going to ignore these types altogether. 

The lig t distillate product pump, which supplied lean oil to the absorber, lost suction at startup. Gas from the absorber backed through the lean oil line and traveled into the hydrotreater charge pump, causing it to gas up and lose suction. This resulted in hydrotreater catalyst damage. 

An additional benefit of this development is increased feedstock flexibility, both for the SGP itself and for the refinery as a whole. The carbon recycle currently practised also recycles some of the ash, so that the charge pump, burner, and reactor system are exposed to a higher content of ash than that present in the fresh feed. Elimination of the recycle thus makes it possible to use feeds with considerably higher ash contents than previously. Current experience of >1000 pg/g vanadium at the reactor inlet would be directly applicable to residues of this quality. This is certainly an important feature when reviewing the possibility of introducing heavier (and cheaper) crudes into the refinery. 

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