Methyl bromide cylinders

Methyl bromide is sold both as the essentially pure compound, 99.5% minimum, with not more than 0.010% water and 0.001% acidity as HBr, and with small amounts of chloropicrin [76-06-2], CCI2NO2. During 1992 methyl bromide in tank cars was priced at 1.70/kg. Methyl bromide is suppHed in 37,850- and 60,560-L tank cars and in 12,220-L ISO cylinders. Repackagers supply methyl bromide in 0.45 kg or 0.68 kg cans for such appHcations as fumigating tobacco seed beds. Alone or in formulations, it is classified as a poison, class B, and requires a poison label. 

Specially bottled methyl bromide, in an aluminium cylinder under nitrogen pressure, disgorged a black sludge when liquid was discharged. Inversion and venting, to blow free the line, gave a burst of flame from the vent. It is presumed that corrosion of the cylinder produced pyrophoric aluminium alkyls. 

Methyl Bromide Truck (cylinders) Hazard Division 2.3 (toxic gas) Potential toxic release hazard Lower... 

The results of the prioritization process are detailed in Table 3.5. Three activities have been ranked as Lower Risk and will be dropped from further consideration. These chemicals have been ranked as lower risk because the concentration of aqueous ammonia and formaldehyde in combination with a small shipment volume presents only a minor enviromnental impact potential. Additionally, methyl bromide is used at some facilities, but it is received in small cylinders that have only a localized impact potential if released while in transit. These chemicals and modes of transport will, however, continue to be reviewed and monitored as part of the global risk management program, including a primary management system review. The remaining chemical and modes of transport will be escalated for qualitative risk analysis. 

A secondary standard is prepared by mixing the substances in a dilution chamber with a voliune of more than 10 m. The larger the better, since the final concentrations of individual components have to be very low. Most of the halocarbons are liquids at room temperature, and are mixed at about the same relative ratios as found in seawater. The gaseous methyl chloride, methyl bromide and CFC-12 are released into the dilution chamber from glass ampoules. The toxicity of methyl halides deserves special attention. An evacuated stainless-steel cylinder, electropolished inside, with a volume of 1-5 L, is opened in the chamber. The gas mixture let into the cylinder is then pressurised with nitrogen gas to reach the required concentration level (mixing ratio). 

Cylinders containing methyl bromide should not be subjected to rough handling... 

Methyl bromide sold in 1-lb (0.45-kg) and 1.5-lb (0.7-kg) cans should be treated in the same manner as cylinders. The contents of the cans are under pressure and should only be opened in the manner recommended by the manufacturer. 

Methyl bromide is shipped in low pressure (225 psi minimum) steel cylinders. Specification 3A225, 3AA225, 3B225, 3E1800,... 

B225, 4BA225, or 4BW225 cylinders are authorized. Specification 4A225 cylinders may also be used, but new construction is not authorized. Pressure relief devices are not required. Methyl bromide is also shipped in 1- and lUlb cans. For further information, see 49 CFR 173.353. [7]... 

The standard valve outlet connection in the United States and Canada for methyl bromide cylinders is Connection CGA 330. The limited standard valve outlet connection is Connection CGA 320. [9]... 

---