Large bulk storage

Other aspects of SFC attracting considerable attention include the very low cost of the main fluid (carbon dioxide), the low disposal costs, and the relatively low toxicity of the fluids used. With large, bulk storage containers carbon dioxide can cost as little as 1/lOOth the cost of organic solvents. 

In some cases, a chemical day tank or dilution tank is provided (Figure 7-8). Utihties using large bulk storage tanks often use day tanks to minimize the risk of accidentally siphoning excessive quantities of treatment chemical because of a pump failure. Dilution... 

The usual protection for large installations is to provide a water-spray system. For small bulk storage, fire hoses or monitors are often adequate. However, for installations over 50 tons of storage (and all major cylinder-filling plants) it is accepted that a fixed water-spray system needs to be provided which is automatically initiated by a system capable of detecting a fire threatening the vessels... 

Model Code Safe Practice Part 9, Large bulk pressure storage and refrigerated LPG... 

Maleic anhydride decomposes exothermically, evolving carbon dioxide, in the presence of alkali- or alkaline earth-metal or ammonium ions, dimethylamine, triethylamine, pyridine or quinoline, at temperatures above 150°C [1], Sodium ions and pyridine are particularly effective, even at concentrations below 0.1%, and decomposition is rapid [2], An industrial incident involved gas-rupture of a large insulated tank of semi-solid maleic anhydride which had been contaminated with sodium hydroxide. Use of additives to reduce the sensitivity of the anhydride has been described [3], Accidental transfer of an aqueous solution of sodium 2-benzothiazolethiolate into a bulk storage tank of the anhydride led to eventual explosive destruction of the tank [4],... 

Storage and Distribution. Solid AN in packages must be stored in a general warehouse that has been approved for AN duty. Bulk AN and CAN must be protected from moisture as both products are hygroscopic. Large bulk warehouses may be air-conditioned... 

The devolatilizer (7) is held under a very high vacuum to remove unreacted monomer and solvent from the polymer melt. The monomer is distilled in the styrene recovery unit (8) and recycled back to the prepolymizer. The polymer melt is then pumped through a die head (9) to form strands, a waterbath (10) to cool the strands, a pelletizer (11) to form pellets and is screened to remove large pellets and fines. The resultant product is air-conveyed to bulk storage and packaging facilities. 

To use such large data sets, computerized data management systems will be needed. These systems must communicate with data acquisition systems and transcribe the received data onto permanent bulk storage media. 

The decontaminated supemate may be evaporated to a solid salt in a wiped film evaporator. For the design basis assumed in this study, the total volume of solidified salt would be about 100 million 1. (/ 25 million gal). Since the heat-producing isotopes will be removed, this material can be stored in large containers in bulk storage. It is expected that the decontamination of this material will be sufficient that the principal hazard in the salt cake will be the nitrate itself. The activity left in the salt may well be less than that left in waste tanks after final decontamination. On this basis, further processing of this material into a less leachable form would probably not be necessary. However, it is presently assumed that this material cannot be dispersed to the environment. 

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