PTQ Q4 2026 Issue

Identifying patterns in recent refinery incidents

Why recent refinery incidents indicate a systematic issue and demand integrated engineering solutions rather than just incident responses

Manya Novari Kagera Technologies

T hree unrelated fires, four companies, two continents, and one signal the refining and petrochemical indus - try can no longer file under bad luck. The pattern is not just in what went wrong on the ground; it is in how the industry still organises engineering, operations, main - tenance, and data that are supposed to prevent it. Between March and April 2026, three operators on two continents fought fires that, on paper, have nothing in com - mon: a diesel hydrotreater explosion in Texas, a flare-system fire 90 miles down the same coastline, and two unrelated blazes within a month at Mexico’s newest refinery (see Figure 1 ). Side by side, though, the incident reports reveal an uncomfortable pattern: a gap between documented process safety and how the system actually runs on any given shift. That gap is the subject of this probe, both an engineering and a structural problem. Most oil and gas organisations still keep engineering, operations, maintenance, and data in separate lanes, then wonder why decisions are slow, and risk visibility is incomplete. The following incidents are the visible symptoms. The fragmentation underneath them is the root cause, and it is treatable, but only in the right order. Three incidents, one signal On the evening of March 23, an explosion tore through the No. 243 diesel hydrotreater in Complex 2 at Valero’s Port Arthur Refinery, one of the 10 largest in the US (see Figure 2 ). Valero’s own filing with the Texas Commission on Environmental Quality described an ‘unforeseeable release of process fluid’ that ignited and cascaded into upsets across multiple units; residents felt the blast more than 10 miles away.

No one was injured; a fact worth stating plainly, because it matters. However, the explosion destroyed the unit and severely damaged its control room, the very system operators rely on to diagnose and respond to events like this one. The plant was down for more than a month; the resulting emissions event ran 10 days and released more than 157,000 pounds of chemicals from 28 points across the site. Investigators, including the US Chemical Safety Board, have pointed to ruptured high-pressure piping and a detached valve as areas of focus, though the root cause has not been finalised. Eleven days earlier, a process upset at LyondellBasell’s Bayport-area facility near Pasadena released flammable product that found an ignition source at the plant’s flare. The system was specifically installed to safely dispose of unplanned releases. The fire lit up the night sky over La Porte before crews extinguished it by two in the morning. Again, no injuries; again, multi-agency air monitoring found no danger to the public. Once more, the equipment that escalated the event was the equipment built to prevent exactly this outcome. In Mexico, Pemex’s Olmeca refinery at Dos Bocas, the country’s newest and the first refinery it had built in four decades, caught fire twice within a single month. The first, in March, was fatal: oily water overflowed the plant’s perim - eter after heavy rain and ignited on an adjacent road, killing four contractors. The second, on April 9, was confined to a petroleum coke warehouse with no injuries reported. Two fires, one facility, 30 days apart, one of them lethal. Three companies, three regulatory regimes, three dif - ferent proximate mechanisms: a hydrotreater, a flare, a

Process upset ignites at the flare – the safety system itself becomes the point of escalation, No injuries. Lyondell Basell – Pasedena, TX 12 March 2026 Hydrotreater explosion destroys the unit and damages the control room. 415,000 bpd oine for over a month; 157,000 lb emitted over 10 days. Valero – Port Arthur, TX 23 March 2026 Six weeks, three operators, one pattern Refining and petrochemical fire incidents, March - April 2026

Oily water overflows after heavy rain and ignites on an adjacent road. Four contractor fatalities. Pemex Olmeca – Dos Bocas, MX March 2026

Petroleum-coke warehouse re – the second fire at the facility within 30 days. No inj u ries. Pemex Olmeca - Dos Bocas, MX 9 April 2026

1 Mar

15 Mar

1 Apr

15 Apr

Figure 1 Four events in six weeks: the March-April 2026 incident cluster across three operators and two countries

PTQ Q4 2026