Heating Cable Installation
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MULTIPLE CABLES AND SPIRALING
There are two situations where multiple heating cable
runs may be required:
•
Redundant heat-tracing runs
are used in situations
where a backup is required. Each run should be
installed per the design specifications.
•
Double or multiple heat-tracing runs
are used when a
single heat-tracing run alone cannot compensate for
larger heat losses. Double heat-tracing runs should
have extra heating cable installed at heat sinks, as
called out in the design. It is recommended to supply
the extra heating cable at heat sinks alternately from
both runs in order to balance out both circuit lengths.
SPIRAL TRACING
When the design calls for spiralling, begin by
suspending a loop at every 10-foot pipe section.
To determine the loop length, obtain a spiral factor from
the design and multiply by 10. For example, if the spiral
factor of 1.3 is called for, leave a 13-foot loop of heating
cable at every 10-foot section of pipe. Attach the
loop to the pipe at each interval using the appropriate
RAYCHEM attachment tape.
