HPCL Rajasthan refinery fire: CDU restart eyed May 2026

What HPCL disclosed about the April 20 incident

Hindustan Petroleum Corporation Limited (HPCL) has said a hydrocarbon leak was the likely cause of the fire at its joint venture HPCL Rajasthan Refinery Limited (HRRL) facility at Pachpadra in Balotra district. The incident occurred on April 20, 2026 in the crude distillation unit (CDU) section, which is the main processing unit of a refinery. HPCL told stock exchanges that detailed investigations confirmed the fire was localised to a specific area. The company’s update is significant because the refinery was approaching commissioning and was scheduled for a formal inauguration on April 21. HPCL also said restoration work is underway and is expected to be completed within three to four weeks. It added that the CDU restart is anticipated in the second fortnight of May 2026.

Leak suspected at exchanger circuit and pressure gauge tapping point

HPCL’s filings and updates indicate the fire was likely caused by a hydrocarbon leak in a heat exchanger circuit. The company said the leak may have originated from a valve or flange in the circuit, based on preliminary assessments. A more specific suspicion mentioned in the filing was leakage from the pressure gauge tapping point on the vacuum residue exchanger inlet line. HPCL described this conclusion as being based on circumstantial evidence. The incident was confined to the heat exchanger stack area within the CDU section. HPCL’s investigation confirmed that six exchangers and associated supporting equipment were impacted. The company has not, in the shared disclosures, quantified the extent of damage beyond these components.

What was affected, and what HPCL says was not

According to HPCL, the event was localised and did not affect other sections of the refinery. The company said structural integrity across the facility remains intact, with no reported effect on other refinery sections. In the immediate response, the CDU, vacuum distillation unit (VDU), and other units in the CDU section were quickly isolated as a safety measure. HPCL has consistently stated that there was no loss of life or injury to any personnel. The emergency response team at HRRL brought the situation under control, with support from the local administration. The Ministry of Petroleum and Natural Gas also communicated that the fire was doused quickly. HPCL said secondary units are at an advanced stage of commissioning and are progressing as planned.

Restoration timeline and CDU restart guidance

HPCL said restoration work is in progress and is expected to be completed in the next three to four weeks. Based on this timeline, the company has guided that the CDU restart is anticipated in the second fortnight of May 2026. The refinery’s commissioning schedule matters because the CDU is central to processing crude into intermediate streams that feed downstream units. HPCL has not provided a day-specific restart date, but the guidance points to a May restart window after repairs and checks. The company also noted that the incident’s operational and financial impact is under assessment. However, HPCL said it is not expected to be material, based on its initial assessment.

Trial production plan for key fuels in May

HPCL said trial production of key fuels is expected to begin within May 2026. The product list mentioned includes LPG, motor spirit (petrol), high-speed diesel, and naphtha. After trial production, HPCL expects stabilisation and full commissioning of units. This sequence indicates that the company is aiming to move from controlled trial runs to steady operations after the restoration work and unit checks are completed. HPCL’s statement also aligns with its position that secondary units are nearing completion and commissioning activities are continuing. In separate reporting, the greenfield Barmer refinery and petrochemical complex was expected to begin commercial operations on 1 July 2026.

Inauguration postponed, and the inquiry underway

The refinery’s formal inauguration by Prime Minister Narendra Modi, originally scheduled for April 21, 2026, was postponed. HPCL said the postponement was a precautionary measure, and that a revised date would be announced in due course. The delay was linked to safety checks and the ongoing investigation process after the fire. A four-member panel from the oil ministry has started an inquiry into the incident. Separately, reporting also indicated security was heightened at the site, with investigative agencies arriving after the incident. HPCL has said it is undertaking necessary remedial measures alongside the restoration work.

What this means for investors and the refining sector

For investors, the key near-term signal is HPCL’s guidance that the incident is localised and not expected to be material financially, even as assessments continue. Operationally, the timeline for restoring the CDU is important because it sets the pace for the broader commissioning process and product trial runs. The incident also underlines a common risk area for refineries during commissioning phases, where leak integrity at valves, flanges, and instrumentation points is closely scrutinised. HPCL’s disclosure that six exchangers were impacted provides a tangible scope of work for repairs and replacement. Some analysts have suggested that extensive repairs could extend commissioning beyond the projected May restart, but HPCL’s formal guidance remains centred on the second half of May. Markets will likely track subsequent filings for confirmation of restart, trial production milestones, and the final findings of the inquiry panel.

Key facts at a glance

Timeline of the incident and next steps

Conclusion

HPCL has attributed the April 20 fire at HRRL’s CDU section to a suspected hydrocarbon leak, with damage confined to the heat exchanger stack and six exchangers. The company expects restoration to finish in three to four weeks and has guided for a CDU restart in the second fortnight of May 2026. HPCL has also set expectations for trial production of key fuels within May, followed by stabilisation and commissioning. The postponed inauguration and the oil ministry’s inquiry remain near-term developments to watch, alongside any further exchange filings that confirm the restart and commissioning milestones.