The practice and the paper
API RP 67 is the American Petroleum Institute recommended practice for oilfield explosives safety, covering safe handling, storage, transport, and use of explosives in drilling, well servicing, and well intervention operations, including perforating. The practice exists because a shaped charge on a wireline truck is a tool with a narrow safe window: the same energy that cuts casing is dangerous the moment handling discipline slips. The crews who run perforating jobs work with shaped charges, detonators, and primacord, and every one of those items has a custody chain from the magazine to the hole.
The ATF rules on possession and storage
The Bureau of Alcohol, Tobacco, Firearms and Explosives governs the possession and storage of explosives in the United States under 27 CFR 555, the Commerce in Explosives regulations. The rules cover license and permit requirements, recordkeeping, and magazine storage standards. The magazine is not a locker; it is a regulated structure with construction, marking, and inventory requirements. The inspection trail follows the explosive from the magazine to the job and back, and the counts must reconcile, because an unaccounted detonator is a safety event and a regulatory one at the same time.
The DOT rules on the road
Moving Class 1 explosives by road falls under 49 CFR 173, which sets the hazmat classification, packaging, and labeling requirements for transportation. The wireline truck is a hazmat vehicle when it carries explosives, and the driver and the paperwork carry the obligations: proper packaging, proper placarding, proper documentation. The same rules that govern a tanker of acid govern the truck with the perforating guns, which means the lease road is part of the safety envelope, not a gap in it.
Explosives work sits inside the same hazard stack as H2S monitoring, hazmat hauling, and job safety analysis. If magazine counts and job paperwork are reconciled from memory, an operations audit will show which explosive movements are documented end to end.