Flame Arresters

For Mechanical Protection and Safety
For many years, A.H. Lundberg, Inc. has been designing Noncondensible Gas Collection
Systems. Such systems contain combustible or potentially combustible mixtures of gases being
transferred to points of incineration. Experience has shown a need for safety measures to protect
the process equipment. Traditionally, Flame Arresters were provided for part of this protection.
A.H. Lundberg, Inc. designs and supplies Flame Arresters to meet the rigorous standards for
these Systems.

A Typical NCG System
At each emission source in the system, several safety devices are employed. A pair of
interlocked valves block and vent the source if an upset is detected. To back-up these valves in
case of valve failure, a rupture disc is installed and set for about 10 psig. A flame arrester is also
installed at each source. Most noncondensible gas sources are hot and saturated with
moisture. Adequate condensing of moisture is essential for efficient gas combustion. To reduce
combustion problems, the gases should be cooled to the 1200F range. This can be accomplished
in an indirect cooler or a direct contact cooler with indirect heat removal.
Frequently, the mill will elect to install a Lundberg high efficiency RSH scrubber ahead of the
gas cooler. In this unit, the collected NOG are passed through a packed column for removal of
hydrogen sulfide and methyl mercaptan by absorption in white liquor. The total TRS in the NCG
stream is reduced. Condensate from the cooler can be added to the white liquor. Following the
gas cooler, the gases are piped to the combustion chamber of the incinerator boiler or lime kiln
where they are burned at a temperature exceeding 1,600 F.


Features

The Flame Arrester can be easily removed for cleaning without pipeline disturbance. Connections
are provided for measuring the pressure drop through the pack. A pressure differential gauge is
available.

The Flame Arrester is shipped completely assembled with flanged connections to 150 pound
drilling standards on both ends.

The eccentric configuration permits either vertical or horizontal installation without condensate
accumulation.

The standard Flame Arrester is manufactured in T-316 stainless steel, with carbon steel backing
flanges, unless otherwise specified.

The units are sized and selected in accordance with the volume of gases passing through the
piping system.

Lundberg Flame Arrester
SO-1035-D

LUNDBERG FLAME ARRESTER


The Flame Arrester is a heat sink equipped with a heat-absorbing pack, which can be
easily removed for mechanical cleaning without pipeline disturbance. Connections are
provided for measuring the pressure drop through the pack.

An optional manometer assembly mounted on the Flame Arrester or a pressure
differential gauge is available.

The Flame Arrester is shipped completely assembled with flanged connections to 150
pound drilling standards on both ends. The eccentric configuration permits either vertical
or horizontal installation without condensate accumulation.

The standard Flame Arrester is manufactured in T-316 stainless steel, with carbon steel
backing flanges, unless otherwise specified.

The units are sized and selected in accordance with the volume of gases passing through
the piping system.


Reference:

Parkinson, John R., Tappi, J., vol 68, no.1, p.68-71 (January 1985), "Flame Arresters
for Noncondensible Gas Systems".

Dr. Parkinson is Senior Process Consultant to A. H. Lundberg Inc.

Flame Arrester Installation
For Non-Condensible Gas Systems