PHMSA offers enforcement relief for detonator shipments
When a shipment of detonators gets held up due to a paperwork technicality, it’s more than just a delay, it can disrupt entire operations in industries like mining, construction, and demolition. These sectors rely heavily on precise timing and coordination, and any interruption in the supply chain can lead to costly setbacks and safety concerns.
That’s exactly the kind of scenario the Pipeline and Hazardous Materials Safety Administration (PHMSA) is trying to prevent with its latest notice of enforcement discretion, issued May 7, 2025. This temporary measure provides much-needed relief for companies involved in the shipment of electronically programmable detonators, offering both clarity and flexibility in the face of a regulatory mismatch. It’s a proactive step aimed at maintaining operational continuity while longer-term regulatory solutions are considered.
Who does it apply to and why
The enforcement notice is particularly relevant to explosives manufacturers, commercial carriers, logistics professionals, and safety officers in industries like mining, construction, and demolition. The issue stems from a discrepancy between updated federal regulations and two key industry safety publications. In 2022, PHMSA updated the Hazardous Materials Table (HMT) to include new proper shipping names for electronically programmable detonators, specifically:
- UN0511, Detonators, electronic programmable for blasting
- UN0512, Detonators, electronic programmable for blasting, and
- UN0513, Detonators, electronic programmable for blasting.
However, the Institute of Makers of Explosives (IME) publications SLP-22 (2019) and SLP-23 (2021), which are incorporated by reference into federal regulations, have not yet been updated to reflect these changes.
Solution
To address the issue, PHMSA has announced that it will not take enforcement action against offerors or carriers who use the updated shipping names, even though they are not yet included in the IME publications. This decision ensures that shipments can continue without unnecessary delays or penalties, while maintaining safety standards. Importantly, PHMSA has confirmed that using the new names does not compromise transportation safety in any way. This enforcement discretion will remain in effect until the IME publications are formally updated and incorporated into the Hazardous Materials Regulations (HMR).
It’s important to note that this is a temporary and limited measure. It only applies to the shipment of electronically programmable detonators under the guidance of IME SLP-22 and SLP-23. All other regulatory requirements under the HMR still apply, and companies must continue to comply with those obligations. The notice has also been coordinated with and endorsed by the Federal Motor Carrier Safety Administration, adding further assurance to regulated entities.
Key to remember: The enforcement notice provides much needed clarity and flexibility for those involved in the transport of electronically programmable detonators. It reflects PHMSA’s commitment to aligning with international standards while supporting safe and efficient operations.