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It is sometimes possible to run part or all of a
consumer's load on straight (undiluted) propane
vapor. This normally requires separate
distribution piping and modifications to each
appliance burner train. Large, centralized loads
such as boilers are candidates for this
approach.
Propane-air is the more universal approach to
standby fuel. By mixing approx. 55% propane and
45% air, a gas is produced that performs well in
natural-gas burners without individual
adjustment. The mix is injected into the
natural-gas system as partial or full
replacement.
There are several approaches to mixing propane
and air, and many blender (mixer) options can be
considered. The mixer type influences selection
of other equipment used in the system. Common
types of propane-air blenders with related
mixed-gas pressure ranges are shown in the
diagrams below. Note that systems and controls
vary widely, and configurations are not shown in
complete detail.
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