Case Name, Disaster of Chemical Plant at Flixborough. Pictograph. Date, June 1, Place, Flixborough, UK. Location, Cyclohexanone oxidation plant. Flixborough. disaster. vapour cloud explosion. cyclohexane. loss prevention. risk assessment J.G. BallAfter the Flixborough Report: do we know the real truth?. 1 June is the 40th anniversary of the Flixborough disaster, The Flixborough Plant before the explosion – official report, TS 84/37/1.

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The plant was subsequently shutdown for an investigation.

The leaks having been dealt with, early on 1 June attempts began to bring the plant back up diwaster pressure and temperature. The temporary pipe acted to twist the flow, and the bellows were ruptured by shear stress.

Alexa Actionable Analytics for the Web. Government controls on the price of caprolactam put further financial pressure on the plant. Retrieved 1 July Although the operating pressure was maintained by an automatically controlled bleed valve once the plant had reached steady state, the valve could not be used during start-up, when there was no air feed, the plant being pressurised with nitrogen.

The disaster was caused wholly by the coincidence of a number of unlikely errors in the design and installation of a modification. The reason for why the bellows fractured by shear stress, was that the temporary pipe was installed without examining what the effect of a slight pressure rise on the bellows would be.

No reference was made to the relevant British Standard or any other accepted standard.

Flixborough (Nypro UK) Explosion 1st June

In regard to the failure of the temporary pipe and an 8in. Skip to content Skip to navigation. Knowledge Comment It was well known to metallurgists that water contained nitrates causes stress corrosion cracking of mild steel.

Retrieved from ” disastdr Unsourced material may be challenged and removed. None of the 18 occupants of the plant control room survived, nor did any records of plant readings. After the explosion, a metallurgical investigation of the 8in. If the bellows were ‘stiff’ resistant to squirmthe shock loading could cause disaser bellows to tear at pressures below the safety valve setting; it was not impossible that this could occur at pressures experienced during start-up, when pressure was less tightly controlled.

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It was decided to install a temporary pipe to bypass the leaking reactor to allow continued operation of the plant while repairs were made. The Chemical Engineer Explore the Home Gift Guide. Inaugural lecture given on 22 February ” PDF. The temporary pipe was deformed in a “V” shape by bending stress at only slightly above operating pressure, and the bellows, the weak link in the chain, were torn away by shear stress.

The pipe was 20in. Immediately after this disaster occurred, UK government ordered that a formal investigation be carried out by a Court of Inquiry, consisted of a panel of experts.

It is almost impossible to prevent ignition of a leak the size of that which occurred at Flixborough. Both of the bellows had torn away from the temporary pipe.

Flixborough disaster

A leak occurred at a flange on the non-return valve, located near this 50in. Where management lays down safety rules, it must also ensure that they are carried out. It was the biggest explosion to ever occur in Britain during peacetimeuntil the fire at the Hertfordshire oil storage terminal Buncefield in December The Flixborough disaster was an explosion at a chemical plant close to the village of FlixboroughNorth LincolnshireEngland on Saturday, 1 June The plant was intended to produce 70, tpa tons per annum of caprolactam but was reaching a rate of only 47, tpa in early The disaster was caused by ‘a well designed and constructed plant’ undergoing a modification that destroyed its technical integrity.

Learn more about Amazon Prime. Mon 26 Jun at This explosion killed 28 men were and injured 36 men on site. The approach advocated by the ACMH was largely followed in subsequent UK legislation and regulatory action, but following the release of chlordioxins by a runaway chemical reaction at Seveso in northern Italy in July’major hazard plants’ became an EU-wide issue and the UK approach became subsumed in EU-wide initiatives the Seveso Directive insuperseded by the Seveso II Directive in Withoutabox Submit to Film Festivals.


After the plant was restarted on April 1st. A major leak of liquid from the reactor circuit caused the rapid formation of a large cloud of flammable hydrocarbon. The plant design had assumed that the worst consequence of a major leak would be a plant fire and to protect against this a fire detection system had been installed.

Flixborough disaster – Wikipedia

The report of the court of inquiry was critical of the installation of the bypass pipework on a number of counts: From Wikipedia, the free encyclopedia. Tests by the Fire Research Establishment had shown this to be less effective than intended. It is to be hoped that the respect normally accorded to the findings of a Fliborough of Inquiry will not inhibit chemical engineers in looking beyond the report in their endeavours to improve the already good safety record of the chemical industry.

It was well known to metallurgists djsaster water contained nitrates causes stress corrosion cracking of mild steel. If you are a seller for this product, would you like to suggest updates through seller support? No drawing of the pipe was made, other than in chalk on the workshop floor.

It killed 28 people and seriously injured 36 out of a total of 72 people on site at the time.