Focus on personal injury data overshadowed indicators of catastrophic accidents at Deepwater Horizon.

Published:  27 July, 2012

At the Time of 2010 Gulf Blowout, Transocean, BP, industry associations, and Government offshore regulators had not effectively learned critical lessons from 2005 BP Texas City refinery explosion in implementing safety performance indicators.

In preliminary findings released at a public hearing in Houston, US Chemical Safety Board (CSB) investigators examining the Deepwater Horizon explosion in the Gulf reported that companies like Transocean and BP, trade associations, and US regulators largely judged the safety of offshore facilities by focusing on personal injury and fatality data (such as dropped objects and slips, trips, and falls), that overshadowed the use of leading indicators more focused on managing the potential for catastrophic accidents. 

Expanded use of process safety indicators was first recommended by the CSB in its 2007 report on the March 2005 BP Texas City refinery disaster. In the offshore arena, potential indicators – such as timely checks on safety critical equipment and response to well control events – would provide an assessment of the health of their safety management systems. These type of indicators may be precursors to the kind of tragedy that took eleven lives on the Deepwater Horizon drilling rig following the Macondo well blowout on April 20, 2010.

The preliminary findings were presented during the second day of a two-day hearing called by the CSB to examine the need for the US offshore drilling and production industry – and the agencies that regulate it – to develop process safety indicators that will result in safety improvements and reduce the likelihood of major accidents. 

CSB Chairperson Dr. Rafael Moure-Eraso said, “A number of past CSB investigations have found companies focusing on personal injury rates while virtually overlooking looming process safety issues – like the effectiveness of barriers against hazardous releases, automatic shutoff system failures, activation of pressure relief devices, and loss of containment of liquids and gases. Furthermore, we have found failures by companies to implement their own recommendations from previous accidents involving, for example, leaks of flammable materials.”

In its investigation of the Macondo disaster, the CSB found that BP and its contracted drilling rig operator, Transocean, were focused on personal safety issues such as worker injury rates, rather than broader safety issues involving the process of drilling for oil using a complex rig. 

Noting the lack of sustained focus on process safety, CSB Investigator Cheryl MacKenzie described an “eerie resemblance” between the 2005 explosion at the BP Texas City refinery and the explosion aboard the Deepwater Horizon. 

At the BP Texas City refinery on March 23, 2005, contract workers had just returned to temporary trailers at the plant after attending a celebratory lunch commending an excellent personal injury accident record. Shortly after lunch, an explosion occurred during process startup, killing 15 and injuring 180 others. At Macondo, BP and Transocean officials were in the process of lauding operators and workers for a low rate of personal injuries on the very day of that tragedy. Company VIP’s had flown to the rig in part to commend the workforce for zero lost-time incidents.

Investigator MacKenzie said, “The emphasis on personal injury and lost work-time data obscures the bigger picture: that companies need to develop indicators that give them realistic information about their potential for catastrophic accidents. How safety is measured and managed is at the very core of accident prevention. If companies are not measuring safety performance effectively and using those data to continuously improve, they will likely be left in the dark about their safety risks.”

At the public hearing the CSB investigation team presented eight conclusions from the investigation to date:

1. Transocean and BP had multiple safety management system deficiencies that contributed to the Macondo incident.

2. Before the Macondo blowout, the safety approaches and metrics used by the two companies and US trade associations did not adequately focus on major accident hazards. Recently BP officials informed CSB investigators that they are working to develop a more comprehensive offshore indicators program using leading and lagging metrics to help drive performance improvements.

3. Systems used for measuring safety effectiveness in the offshore industry focused on personal safety and infrequent lagging indicators.

4. The US offshore regulator, the Department of the Interior, can achieve a greater impact on major accident prevention through the development of a leading and lagging process safety indicator program.

5. Despite some significant progress with process safety indicator implementation in the downstream oil industry, in the offshore sector BP, Transocean, industry associations, and the regulator had not effectively learned critical lessons of Texas City and other serious process incidents at the time of the Macondo blowout.

6. Companies and trade associations operating in other regulatory regimes outside the US have developed effective indicator programs, recognizing the value of leading indicators, and using those indicators to drive continuous improvement.

7. Trade associations and many of the same companies that operate in the US are partnering with the regulators in other countries in advancing safety indicators programs.

8. In the aftermath of the Macondo blowout, companies and trade associations in the US are initiating efforts to advance the development of offshore major accident indicators.


The CSB investigative team further presented a number of preliminary findings of management system deficiencies underlying the Macondo blowout and explosion. The existence of these deficiencies – at the same time that the relevant companies and the regulator focused on personal safety metrics – underscore the need for more effective process safety indicators, investigators said. These system deficiencies included:

1. BP and Transocean hazard assessment systems were inadequate. For example, the bridging document that sought to harmonize safety controls between BP and Transocean was a minimal document that focused only on six personal safety issues such as minimum heights for employing fall protection equipment. The document did not address major accident hazards like the potential for loss of well control.

2. Hazard assessments of major accident risks on the Deepwater Horizon relied heavily on prompt, correct manual intervention by the rig crew to prevent a catastrophe, for example to divert the flow of flammable hydrocarbons away from the rig during a blowout. Depending on a human reaction alone during an emergency situation – with many distractions – is not a reliable safety layer. A comprehensive hazard assessment should have identified this risk.

3. There were no written procedures for how to conduct the key “negative pressure test” which was conducted on the day of the incident and was necessary to confirm the integrity of the cement seal on the well. There were also no written criteria or safe limits defined for determining if the test was a success.

4. Systems for managing the safety of process changes were inadequate. The plan to complete and “temporarily abandon” the Macondo drilling operation was changed five times during the week before the disaster, but there is no available documentation that management of change procedures or formal hazard assessments were conducted.

5. Systems for investigating safety incidents and implementing and disseminating the findings were inadequate. Prior to the Macondo disaster in December 2009, Transocean operated the Sedco 711 drilling rig in the North Sea (BP was not involved). In an incident similar to Macondo, the Transocean crew had a delayed response to indications that hydrocarbons were flowing into the well. Mud and hydrocarbons eventually reached the rig floor at the sea surface, though they did not ignite in this case and the blowout preventer sealed the well. Transocean prepared an “Operations Advisory” discussing the lessons from the Sedco 711 incident, but it was not effectively communicated to employees beyond the North Sea.

6. On the Deepwater Horizon, a little over a month before the Macondo blowout, there was a delay by operators in responding to a “well kick” – an unanticipated, hazardous influx of hydrocarbons into the wellbore that can precede a blowout.  BP investigated the incident but after informal verbal discussions with Transocean, evidence indicates that Transocean did not implement changes based on the findings.


A robust system of process safety indicators might have revealed many of these management system deficiencies before the disaster occurred, CSB investigators said. CSB Team Lead Cheryl MacKenzie noted that Transocean primarily measured safety performance through two metrics: total recordable injuries and the “Total Potential Severity Rate.” Although Transocean gave itself a zero score for total recordable injuries following the tragedy, its scoring on the potential severity rate enabled top-level management at Transocean to receive financial bonuses for safety performance. The focus on personal safety was reflected in a 2004 Transocean major accident hazard risk assessment of the Deepwater Horizon. The assessment made 27 recommendations for safety improvements – but almost all addressed personal safety issues and no recommendations addressed major accident risks such as gas entering the riser or well blowouts.

The CSB investigation is also looking at the role US regulators and regulations played in the time preceding to the accident. The CSB found that BP was a finalist for a safety award from the Minerals Management Service (MMS), the former Department of the Interior agency overseeing offshore oil exploration and production, and that a total of 15 safety awards had been given to BP and Transocean over a period of years. The criteria used to determine the award candidates, CSB investigators said, focused on personal safety metrics and did not give an accurate measure of safety management system performance to control major accident hazards.

Following the Macondo blowout, a reorganization within the Interior Department created the Bureau of Safety and Environmental Enforcement (BSEE). Preliminary CSB findings indicate that some reporting requirements have become mandatory, but the focus remains on reporting major accident events such as fires rather than predictive, leading indicators.

The onshore refining industry, responding to a previous CSB recommendation to the American Petroleum Institute (API) and the United Steelworkers Union, is moving toward the development of key safety performance indicators, the CSB noted.  

CSB Chairman Moure-Eraso said, “API has taken a positive step forward in establishing ‘Recommend Practice 754’ on safety performance indicators but I believe that input from all stakeholders is necessary to develop a more robust recommended practice. We would like to see API move even further and focus more on leading indicators to proactively measure safety system performance before accidents occur. I believe the offshore drilling industry could benefit from such a program as well.  Meantime, it is encouraging to see the industry move in this important direction, which will help prevent accidents and save lives.”

  • Operation Florian

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