figure 23 : Cable applied on metal wire mesh
Consult the design specification for the heat-tracing
requirements of fittings and supports.
The heating cable’s minimum bend radius must be
respected (refer to Table 1).
The minimum spacing must be respected, unless design
documentation clearly states other values, also refer to page 11,
figure 5.
3.6 heating cable allowances
All parts of a heat traced system that increase the surface area of the
insulated pipe/ vessel or metallic fins that protrude out of the insulation
(e.g. supports), will increase the overall heat loss. These areas of
increased heat loss require compensation, either by using higher overall
design safety factors or by the addition of extra cable length. In such
cases sufficient cable should be added to at least enable removal of
instruments, valves etc (“maintenance loop”).
For further details on individual allowances please refer to Pentair
Thermal Management design specification (e.g. TraceCalc Pro reports).
22
