RSPA proposes changes in rule for liquefied compressed gases

A few changes may be in store in the rule for passive shutdown and remote control devices for liquefied compressed gases, according to information published in the "Federal Register" January 21. The Research and Special Programs Administration (RSPA) learned after it adopted the rule that in order to comply, some vehicles would have to have both a passive and an off-truck remote means of emergency discharge control.

"It was never our intention to require a CTMV (cargo tank motor vehicle) to meet both requirements," the RSPA proposal states. "If a CTMV operating in both metered and non-metered delivery service is equipped with a passive means of shut-down that meets the requirements in Sec. 173.315(n)(2) and functions for both metered and non-metered deliveries, then it need not also be equipped with an off-truck remote means of shut down."

RSPA also proposes to add a specific entry in the chart in Sec. 173.315(n)(1) to address CTMVs that operate in both metered and other-than-metered delivery service. It would permit CTMVs in both metered and other-than-metered delivery service, with capacities of more than 3,500 water gallons, to be equipped with a passive means of emergency discharge control, provided that the system functions for both metered and non-metered deliveries. If the system functions only for non-metered deliveries, then the CTMV also would have to be equipped with an off-truck remote emergency discharge control system.

In relation to cryogenic liquids, the proposal points out that they have not been subject to the requirements of the hazardous materials regulation when transported by motor vehicle or railcar if they meet certain conditions. RSPA is proposing that the rules pertaining to emergency response information and training will now apply to cryogenic liquids.

"We never intended to except shipments of cryogenic liquids from these requirements," the proposal states.

The proposal also addresses a request from Monsanto regarding running the engine of a cargo tank vehicle during loading and unloading of Class 3 materials. RSPA is proposing to amend the rule to (a) to permit the diesel engine to be running during loading and unloading of Class 3 materials if the ambient temperature is at or below -12 degrees centigrade (10 degrees Fahrenheit. Monsanto had argued that a motor vehicle's diesel engine is very difficult to restart if the engine is turned off in extremely cold weather for loading or unloading of product. Monsanto believes that the operating benefits of leaving a motor vehicle engine running in the temperatures stated outweigh the flammability risks and RSPA concurs, according to the information.

To see the information in its entirety, click here for the "Federal Register."

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