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3.3 heating cable attachment
Fix in place with metal bandings, tie wire or wire cloth band at a
typical interval of 300 mm and additionally where necessary.
The use of tie wire with softer sheath MI heating cables (like
copper HC and cupro-nickel HD) should be avoided, as the tie wire
can damage the heating cable surface over time. Do not tighten
tie wire, use wire cloth band wherever possible.
The hot to cold junction should be secured with metal bands at a
typical distance of 150 mm on either side of the joints.
Cable must be installed and fixed such that movement of cable
during its heating up cycles is permitted, but not to allow cable
to move freely under its own weight. Other attachments (like
aluminium tape or glass tape) may be used, if specified in the
design documentation.
The heating cables may be installed in straight, multiple runs as
required by the design specification.
On horizontal pipes fix on lower quadrant as shown below and not
on bottom of pipe.
figure 6 : Cable orientation on pipe
Weatherproof
jacket (typ)
Pipe
Cable
One heating cable
On vertical pipe sections fix the heating cables equally distributed
around the pipe circumference.
Read the design documents, in particular concerning the need
for cable allowances and regard the location of junction boxes/
controllers before permanently attaching the cable to the pipe.
Temperature
sensor
Insulation
(typ)
Cable
Cable
Cable
Two heating cables
Temperature
Sensor
Cable
Temperature
sensor
Cable
13 13
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