HPCL Rajasthan refinery CDU restarts after April fire 2026

Restart clears key hurdle for HRRL ramp-up

Hindustan Petroleum Corporation Ltd (HPCL) said its joint venture refinery in Rajasthan has restarted its crude distillation unit (CDU) after completing restoration work following a localised fire in April. The restart is significant because the CDU is the primary processing unit in a refinery and a prerequisite for stable, end-to-end operations. HPCL said the restart paves the way for a phased ramp-up of fuel production at HPCL Rajasthan Refinery Ltd (HRRL). The company communicated the update through a stock exchange filing. The April incident had temporarily disrupted commissioning and ramp-up activities at the project. HRRL is HPCL’s Rajasthan joint venture refinery and is described by the company as newly built. The latest operational progress comes after weeks of repair and investigation work.

What HPCL reported in the stock exchange filing

HPCL said the CDU at HRRL was “successfully restarted” after repairs were completed. It added that all product streams from the CDU and the vacuum distillation unit (VDU) are now being produced and routed for downstream processing. The CDU and VDU are core front-end units that prepare intermediate streams for secondary units. HPCL’s filing indicates that production is not limited to a single stream and that routing to tanks and downstream processing has begun. The company also said management remains focused on ensuring safe, stable, and efficient operations. According to HPCL, the refinery will progressively increase production towards optimal capacity utilisation. The update signals movement from restoration to controlled ramp-up. HPCL did not quantify the ramp-up rate, but it did outline product and dispatch timelines.

Products already being produced and near-term dispatch plans

HPCL said HRRL has commenced production of key petroleum products, including Bharat Stage VI-compliant high-speed diesel (HSD), liquefied petroleum gas (LPG), petroleum coke (petcoke), and naphtha. It said sales of LPG and petcoke have begun. Dispatches of BS-VI diesel are expected to start by the end of this week, as per the filing. Production and dispatch of BS-VI motor spirit (petrol) are slated to commence next week. The company framed this as a phased ramp-up rather than an immediate move to peak throughput. These product updates also indicate that downstream handling, storage, and dispatch systems are being readied alongside unit operations. HPCL did not provide volumes for the initial dispatches. It also did not provide updated commercial commissioning dates in the filing that announced the restart.

What happened: April 20 fire at the CDU area

The restart follows a localised fire on April 20 in a heat exchanger stack of the CDU, HPCL said. The incident occurred at the main unit of the refinery complex, and commissioning and ramp-up activities were temporarily disrupted. Another account in the provided material notes that a major fire broke out near the main unit of the newly built refinery on April 20, a day before an inauguration scheduled for April 21. The crude distillation unit is described as the main unit of a refinery, which is why the incident had operational importance even though it was localised. HPCL and the Ministry of Petroleum and Natural Gas indicated the fire was brought under control quickly, with one report stating it was controlled within two hours. HPCL also stated there was no loss of life or injury to personnel. Following the incident, both the CDU and VDU were promptly isolated, according to the reports.

Investigation findings and the extent of equipment affected

HPCL said preliminary findings suggested the fire was likely caused by a hydrocarbon leak from a valve or flange in a heat exchanger circuit. In a separate operational update dated April 26, HPCL said post-incident detailed investigations confirmed the fire was confined to the heat exchanger stack area. It added that six exchangers and associated auxiliary equipment were affected. HPCL also said circumstantial evidence pointed to a leak from the pressure gauge tapping point on the inlet line of the vacuum residue exchanger as the suspected source. The company stated that structural integrity across the facility remained intact, with no reported effect on other refinery sections. A four-member panel from the oil ministry started an inquiry, according to the provided material. HPCL also said the incident’s financial and operational impact was under assessment but not expected to be material.

Commissioning context: capacity, cost, and project timeline

The April 20 fire happened during a critical commissioning window for HRRL. The facility is described as a 9 million tonnes a year refinery, and another report cited capacity of 180,000 barrels per day. The refinery project cost was reported as Rs 79,450 crore. The incident occurred a day before a scheduled inauguration by Prime Minister Narendra Modi, which was postponed for safety checks and to allow investigations to conclude, as per the provided text. An April 26 update from HPCL had indicated that operations were likely to resume in the second half of May and that repair work would be completed within three to four weeks. That earlier timeline is now overtaken by the latest filing stating the CDU has been restarted after restoration work. Separately, ICIS reported the greenfield Barmer refinery and petrochemical complex is expected to begin commercial operations on 1 July 2026.

What the restart means operationally

By restoring the CDU and restarting product streams through the CDU and VDU, HRRL can feed downstream units more consistently, which supports stable product quality and regular dispatches. HPCL’s timeline suggests immediate focus on diesel and then petrol, alongside ongoing LPG and petcoke sales. The company’s emphasis on safe and stable operations indicates a controlled ramp-up approach after an incident in the main unit area. HPCL also noted that other secondary processing units were in advanced stages of commissioning and remained on schedule, based on the April 26 update. Trial production of products such as LPG, petrol, diesel, and naphtha was earlier expected during May, followed by stabilisation and eventual full-scale commissioning. With the CDU restart confirmed, the near-term operational focus shifts to reliability, unit stabilisation, and execution of dispatch schedules. HPCL has not provided a revised date for full commissioning in the restart filing.

Key facts at a glance

Market impact

HPCL said the incident’s financial and operational impact was being assessed but not expected to be material. From an operations standpoint, the key market relevance is the timing of incremental supply of BS-VI diesel and petrol from the refinery, since dispatches were explicitly tied to near-term timelines. The company’s confirmation that LPG and petcoke sales have begun suggests some monetisation has already started even as ramp-up continues. The restoration also reduces uncertainty around the commissioning schedule that had been disrupted after April 20. For investors tracking execution risk in large refinery projects, the move from repair work to restarting the CDU is a measurable milestone. The fact that damage was described as confined to the heat exchanger stack, with six exchangers affected, provides context on why HPCL could move to restoration and restart within weeks. HPCL also pointed to safe and stable operations as the priority while increasing utilisation.

Analysis: why the CDU restart matters

In refinery commissioning, the CDU is the foundational unit that enables the flow of crude into the processing chain, so a restart is an operational signal that restoration is complete and systems are being stabilised. HPCL’s product list indicates progress across both fuels and refinery by-products, which can support a broader start-up sequence across units. The company’s staged dispatch plan, diesel first and petrol next, suggests a structured approach to restarting logistics and product certification processes. The April 26 statement that secondary units were on schedule, combined with the latest confirmation of CDU restart, points to continuity in the broader commissioning plan despite the disruption. The presence of an oil ministry inquiry panel and HPCL’s own investigation details highlight that safety review and accountability are part of the restart context. The postponed inauguration and the proximity of the incident to that event underlines the sensitivity around commissioning readiness. The 1 July 2026 commercial operations expectation reported by ICIS provides a benchmark timeline that markets may use to track subsequent updates.

Conclusion

HPCL’s confirmation that HRRL’s CDU has restarted after restoration work marks a key step in resuming commissioning momentum after the April 20 fire. The company has already begun producing BS-VI diesel, LPG, petcoke, and naphtha, with diesel dispatches expected by the end of this week and petrol dispatches next week. HPCL said the fire was localised, affected six exchangers and associated equipment, and was likely caused by a hydrocarbon leak in the heat exchanger circuit. Next updates to watch include sustained unit stabilisation, ramp-up towards higher utilisation, and any further disclosures on commissioning milestones and the findings of the oil ministry inquiry panel.