Coohng line

Polypropylene was produced in three reaction trains on a location that employed nearly 300 workers. A recycle coohng line on a reactor in Train A plngged with product slurry. This was considered a regular occurrence. Standard procedures to address this plugged hne required mechanics to work under the direction of operators to rod-out the line. Part of the cleaning procedme requires the introduction of a hydraulic ram to scrape the inner walls of the recycle line. 

Manufacture of friction elements includes the impregnation of fabrics and subsequent lamination, the wet-dough process, and the dry-mix process. Elements from the last two are prepared by compression-molding the formulation for up to an hour at 150—175°C. Thick brake elements require a carefully controUed heating-and-cooHng cycle to minimize stresses created by expansion and contraction (see Brake linings and clutch facings Fillers). 

In operating a coohng tower in the thermocycle or free-cooling mode, some precautions are necessary to minimize icing problems. These include fan reversals to circulate air down through the tower inlet louvers, proper water distribution, constant water flow over the tower, heat tracing of lines such as makeup lines as required, and maximum loading per tower cell. 

The Cu-Zn system (see Figure 2.7) displays a number of intermediate solid solutions that arise due to limited solubility between the two elements. For example, at low wt% Zn, which incidently is the composition of alloys known as brass, the relatively pure copper a phase is able to accommodate small amounts of Zn as an impurity in the crystal structure. This is known as a terminal solid phase, and the solubility limit where intermediate solid solutions (such as a + /S) begin to occur is called the solvus line. Some of the three-phase transformations that are found in this diagram include a peritectic (5 - - L -> e) and a eutectoid (5 -> y - - e). Remember that these three-phase transformations are defined for equilibrium coohng processes, not heating or nonequihbrium conditions. 

To minimize interference between the different plasma collection schemes used it was decided to use a spatially separated system. The antiproton collection, coohng, and compression is housed in the same superconducting magnet system as the recombination trap, but the positron accumulator is a stand-alone system connected to the main apparatus by a beam line incorporating differential pumping and a fast valve. Figure 1 shows a schematic lay-out of the apparatus and the following sub-sections describe the individual parts of the apparatus in more detail. 

It became necessary to hydrostatically test the vessel jacket, so it was properly blinded and passed the test. But during the startup, as the inlet coohng water valve was opened, the small flat top vessel collapsed. Repairs were expensive and the startup was delayed by several weeks because no one remembered to remove the blind on the valve-free water discharge line [21]. 

Sr. No. Description Hot Water from T-108-Jacket of V-102 A/B Hot Water from Jacket of V-102 A/B-T-108 Cooling water from header-jacket of R-101 Coohng water from Jacket of R-101-main Header (Return Line) Cooling water from header-EX-101 Coohng water from EX-lOl-main Header (Return Line)... 

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