High-Hazard TICs

List of High Hazard TICs. ITF-25 was tasked to rank chemicals according to their hazard index. ITF-25 considered that for a given chemical to present a hazard in a military situation, the chemical must be present in sufficient quantity in the area of concern, must exhibit sufficient toxicity by inhalation and must normally exist in a state which could give rise to an inhalation hazard. The following is a list of toxic industrial chemicals that received a high hazard index ranking. See USACHPPM TG 230 for the toxicity values associated with these and other toxic industrial compounds that may be encountered in the field. 

High-hazard TICs are highly toxic, produced in large quantities, and vaporize easily. TICs that may be ranked high in one or two of these characteristics, but low in the rest, are grouped as medium hazards. Table 2.8 lists properties of selected medium-hazard TICs. 

The IDLH of the TICs in this group ranges from 1 ppm to 1200 ppm. Clearly, the volatility of each TIC in this group is higher than respective IDLH level. Vapor pressures are mostly lower than the compounds listed in the high-hazard group. 

Low-hazard TICs include compounds that have relatively low toxicity, VP, or volatility, and relatively small quantities are being produced, stored, or transported (Table 2.9). The threat from deployment of these TICs is considered much less likely than those listed as high or medium hazards. Nevertheless, their existence could still become threats to the public. 

Among the oxide composites, SiC whisker-reinforced alumina deserves some discussion. It was first introduced in the 1980s, and there was high level of enthusiasm for whisker composites. In addition to SiC whiskers, work had been done with whiskers of TiC, TiCN, and TiB2 showing improved performance in laboratory (Pettersson and Johnsson 2003) (Fig. la), but these did not get much commercial success due to lack of significant differentiation in performance and lack of whisker availability. Commercially available composites have used SiC as whisker for the last two decades. Improvements have been made in xmderstanding the whisker-matrix relationship. Whisker is the cost driver and is a health hazard. 

The fuel gas to a fired heater is controlled by a BPCS control function (function TIC-1), which throttles a fuel control valve, CV-1, as shown in Figure F-3. A hazard analysis was performed to identify process hazards and to determine whether the safeguards were sufficient to mitigate the process hazards. The team determined that when the heater was firing hard, a low-pass flow through the tubes could result in a high firebox temperature with the potential for tube rupture, furnace fire and structural damage to the furnace. 

More than 90 chemicals are considered TICs, and they are grouped as high, medium, and low hazards based on the combination of toxicity, volatility, and amount being produced, stored, and transported annually. Each TIC is ranked according to a hazard index (HI). The HI is the product of four factors, numerically ranked between 1 and 5 according to the ranking scheme in Table 2.6. 

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