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Bringing gas-powered installations back online

  • Fact sheet
Repair, maintenance shutdown, adjustment of phase, often require the shutdown and restart of gas-powered installations. This procedure is frequently time consuming to implement, depending on the type of equipment considered (superheater, steam generator), and it can generate accidents. The following fact sheet analyzes some notable incidents in order to draw lessons from them. Date of the document: November 2011
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Gas Boiler Accidents

Gas boiler accidents

  • Study
The analysis of gas boiler accidents is based on a sample of 121 French accidents listed in the ARIA database. After a foreword on the activities involved, typology and consequences of the accidents, the main risks related to the use of fuel gas are examined such as gas leakage before the boiler, explosion in the combustion chamber, etc. Lastly, the analysis of these accidents reveals that one out of three accidents occurs in transitory phase and that the main causes are rarely due to purely technical reasons.
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Accidentology Involving Hydrogen

Accidentology involving hydrogen

  • Study
The analysis of accidents involving hydrogen (H2) draws from a sample of 215 events involving the gas and recorded in the ARIA database. After going through a few general indicators on such accidents, their consequences and impacted activities, the various risks related to the physico-chemical properties of hydrogen are dealt with in detail: tendency to escape, extreme flammability, property to detonate, impact on metal and alloy structures, highly reactive, etc.
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34280

  • Accident report
  • FRANCE

A natural gas leak was reported in the city center around 11:30 am on a water network. Emergency services set up a security perimeter and conduct reconnaissance , when an explosion 45 minutes later damaged several buildings. Fire reached the buildings near the site of the explosion before spreading to other buildings. The intervention mobilized 180 firefighters and 300 police officers. The gas leak is no longer supplied to 2:15 p.m. Between 500 and 1,000 people were evacuated , including childrens, school's staff and day care nursery. 38 residen [...]

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Leak On A Truck After Filling In An LPG Depot

Leak on a truck after filling in an LPG depot

  • Accident report
  • FRANCE

At 6:40 am, a road tanker containing 12 m³ of liquefied propane under 8 bar of pressure struck the gate of a filling centre. A leak ensued on the cistern around the drain downstream of the distribution pump (diameter: 12 mm), housed in the right side compartment in back of the lorry. Ripping the compartment off its support caused bursting of the drain located between the bottom flap and the closure valve. The flap, which was at least partially open, was unable to provide a seal. The centre's manager activated the site's shutdown procedure and tr [...]

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Boiler Explosion In A District Heating Boiler Plant

Boiler explosion in a district heating boiler plant

  • Accident report
  • FRANCE

An explosion occurred at 1:30 am inside an urban heating plant (500 MW, 6,000 m² floor area), with the energy dissipated into the ground estimated at the equivalent of a 50 kg charge of TNT. Operational since 1987, this heating unit comprised 5 boilers (2 coal-fired, 2 fuelled by a coal/gas mix, and 1 gas-powered). During the previous shift, several attempts to start up one of the mixed fuel boilers failed. Unable to restart the equipment and with the gas inlet pressure gauges indicating zero pressure, the foreman of the night shift ordered ope [...]

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