Evacuating—Selection Procedure

Rough Estimate of System Pumpdown Using Steam Jets [24J 

The remarks presented earlier regarding the use of steam jets for pumping down a system apply. The method of power [35] presented by Reference [24] is  

Step 1. Determine evacuation time in minutes per hundred cubic feet. 

Step 2. Go to the left-hand column in table, final Suction Pressure (hs). Read across to find evacuation time equal to or less than that determined in Step 1. Read to the top of table and note unit number. See Table 6-15. 

P s = design suction pressure of ejector, torr V = free volume of the process system, cu ft Wj = ejector capacity, 70°F dry air basis, lb/hr 

---

Wlien there are unwanted incidental releases of highly hazardous chemicals in the process area, the employer must inform employees of the actions/procedures to take. If the employer wants employees to evacuate the area, then the emergency action plan will be activated. Eor outdoor processes, where wind direction is important for selecting the safe route to a refuge area, the employers should place a wind direction indicator, such as a wind sock or pennant, at the highest point visible... 

General Procedure for the Hydroformylation/N,N-acetal Formation. Synthesis of Biaza-cycloalkanes. The unsaturated diamine (leq), [Rh(OAc)2h (0.5 mol % Rh atoms) and BIPHEPHOS (2 mol %) were placed in an autoclave under N2 followed by deoxygenated benzene The vessel was flushed and evacuated three times with CO/H2 (1 1,13 bar) and then pressurized to 28 bar. The reaction was kept at 40-80 °C for 20h. The autoclave was cooled and the gases were released followed by selective extraction of the total product with light petroleum. Concentration of the solvent gave in most cases NMR pure material of the title compounds. 

Stopped after 180 h time on stream and the reaction setup was evacuated for 10 min at 100 °C. When the experiment was continued after this procedure, the activity had indeed increased by 80% from TOFs of initially 60 h to 108 h Within the next 20 h of reaction the TOFs decreased again from 108 h to 76 h and the selectivity re-estabhshed at 95% n-butanal. A second vacuum period of 10 min resulted in improved TOFs, as depicted in Fig. 4. hi both cases the observed overshooting of the activity directly after evacuation might be caused by either simultaneous removal of CO ligand of the Rh-3-complex leading to higher activity or a rearrangement of the active surface due to sudden evaporation of dissolved heavies. In the first case, a lower selectivity would be expected, which was indeed observed directly after the evacuation. Thereafter, the catalyst solution was re-saturated with CO gas and both the activity and the selectivity approached the initial levels. 

Much of the CANMET investigation required that the strength characteristics of specimens from different mixes be similar, which would be obtainable only with complete infiltration of similar concrete. The procedures were standardized therefore to obtain the best matrix condition for infiltration within about 2 days. A water/cement ratio of 0.7 was selected after much testing it yields a highly permeable concrete which can be handled after 24 hr of moist-curing and from which uncombined water can be removed with 20 hr of drying. The infiltration process involves evacuation of the immersion vessels to expedite the displace-... 

Sample Preparation. Samples were prepared by exposing the silica gel, previously dried at 150 °C for 24 h, to either cyclohexane or pentane solutions containing selected amounts of the fluorophore. The solvent was carefully removed under vacuum when required. Complete probe adsorption of liquid-solid samples was verified with absorption spectroscopy. Less than 0.07% of the silica surface was typically covered by the probe. Immediately before data collection, dry samples were evacuated under vacuum at 125-130 °C for 30 min. The total dehydration procedure was sufficient to remove the physisorbed water while leaving the surface silanol functionality intact (12). Selected amounts of oxygen were introduced into a... 

The sound of the evacuation alarm also alerts the specialty teams to assemble in predetermined locations. The nucleus of each team is selected from the Radiation Safety Department. This department is responsible for establishing procedures, controls, and performing audits to ensure nuclear criticality safety, health physics, and environmental monitoring compliance for normal plant operations. Each team member thus provides to the team expertise that coincides with the need at times of such emergencies. 

Fire prevention training courses include the causes of fire and fire spread, fire and smoke alarm systems, emergency lighting, the selection and use of fire extinguishers and sprinkler systems, evacuation procedures, high risk operations and good housekeeping principles. 

Interpenetrating Composite Aerogels by Supercritical Solvent Evacuation A related procedure was reported for the preparation of highly porous, low-density composites. This process relies on the selection of a cosolvent that is suitable for the preparation of interpenetrating organic-inorganic composites, and can also be replaced by carbon dioxide under supercritical... 

Fire identification and reporting procedures The classes and hazards of fire How to activate the fire alarm and notify others How to select and use the proper fire extinguisher Techniques for controlling smoke and fire Evacuation routes and egress responsibilities... 

---