Investigation of a large industrial oxygen valve fire

Risto Lautkaski

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

A 300-mm butterfly valve in an industrial oxygen pipeline ignited during system start-up, resulting in three fatalities. The valve was apparently stuck and the operators used pipe tongs to open it. Afterwards, hand wheel torque required to open identical valves when subjected to 35-bar pressure difference was measured. Three test valves opened easily but a high torque was required with the fourth one. This was due to a damaged PTFE sliding layer of the free shaft main bearing. Several possible causes of the fire were identified. Frictional heating could have occurred at a foreign body wedged between the disc and valve body or Fire Safe seal, or at damaged free shaft bearing. The heated metal parts would have ignited the PTFE seat or coating of the free shaft bearing, respectively. In addition, ignition of the Fire Safe seal or valve body by particle impact could have occurred due to contaminants carried by the oxygen flow or due to particles detached from the wedged foreign body.

Original languageEnglish
Pages (from-to)466-471
JournalJournal of Loss Prevention in the Process Industries
Volume21
Issue number4
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Bearings (structural)
valves (equipment)
Fires
Polytetrafluoroethylene
Torque
Oxygen
Foreign Bodies
oxygen
Polytetrafluoroethylenes
Seals
Butterflies
foreign bodies
torque
Seats
seals
Heating
Ignition
Wheels
Hand
Pipelines

Keywords

  • oxygen systems
  • butterfly valve
  • ignition mechanisms
  • accident investigation

Cite this

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title = "Investigation of a large industrial oxygen valve fire",
abstract = "A 300-mm butterfly valve in an industrial oxygen pipeline ignited during system start-up, resulting in three fatalities. The valve was apparently stuck and the operators used pipe tongs to open it. Afterwards, hand wheel torque required to open identical valves when subjected to 35-bar pressure difference was measured. Three test valves opened easily but a high torque was required with the fourth one. This was due to a damaged PTFE sliding layer of the free shaft main bearing. Several possible causes of the fire were identified. Frictional heating could have occurred at a foreign body wedged between the disc and valve body or Fire Safe seal, or at damaged free shaft bearing. The heated metal parts would have ignited the PTFE seat or coating of the free shaft bearing, respectively. In addition, ignition of the Fire Safe seal or valve body by particle impact could have occurred due to contaminants carried by the oxygen flow or due to particles detached from the wedged foreign body.",
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Investigation of a large industrial oxygen valve fire. / Lautkaski, Risto.

In: Journal of Loss Prevention in the Process Industries, Vol. 21, No. 4, 2008, p. 466-471.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Investigation of a large industrial oxygen valve fire

AU - Lautkaski, Risto

PY - 2008

Y1 - 2008

N2 - A 300-mm butterfly valve in an industrial oxygen pipeline ignited during system start-up, resulting in three fatalities. The valve was apparently stuck and the operators used pipe tongs to open it. Afterwards, hand wheel torque required to open identical valves when subjected to 35-bar pressure difference was measured. Three test valves opened easily but a high torque was required with the fourth one. This was due to a damaged PTFE sliding layer of the free shaft main bearing. Several possible causes of the fire were identified. Frictional heating could have occurred at a foreign body wedged between the disc and valve body or Fire Safe seal, or at damaged free shaft bearing. The heated metal parts would have ignited the PTFE seat or coating of the free shaft bearing, respectively. In addition, ignition of the Fire Safe seal or valve body by particle impact could have occurred due to contaminants carried by the oxygen flow or due to particles detached from the wedged foreign body.

AB - A 300-mm butterfly valve in an industrial oxygen pipeline ignited during system start-up, resulting in three fatalities. The valve was apparently stuck and the operators used pipe tongs to open it. Afterwards, hand wheel torque required to open identical valves when subjected to 35-bar pressure difference was measured. Three test valves opened easily but a high torque was required with the fourth one. This was due to a damaged PTFE sliding layer of the free shaft main bearing. Several possible causes of the fire were identified. Frictional heating could have occurred at a foreign body wedged between the disc and valve body or Fire Safe seal, or at damaged free shaft bearing. The heated metal parts would have ignited the PTFE seat or coating of the free shaft bearing, respectively. In addition, ignition of the Fire Safe seal or valve body by particle impact could have occurred due to contaminants carried by the oxygen flow or due to particles detached from the wedged foreign body.

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KW - butterfly valve

KW - ignition mechanisms

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