Electra EMD 100 Bedienungsanleitung PDF herunterladen (Seite 8)

Heating cable’s selection

Proper selection of the heating cable adequate for the

pipe heating purposes, requires estimation of the

pipeline’s heat losses. If detailed calculation won’t be

made, the table below can be used for general

estimation.

Heat losses in the function of pipeline’s diameters

and thermal insulation’s thickness

10 5.8 8.6 10.5 12.3 14.9 17.9 21.6

13 5.0 7.2 8.7 10.2 12.2 14.5 17.3

16 4.5 6.4 7.6 8.8 10.5 12.3 14.7

19 4.1 5.7 6.8 7.9 9.3 10.9 12.8

20 30 4.1 5.6 6.6 7.6 8.9 10.5 12.3

25 3.7 4.9 5.8 6.6 7.7 8.9 10.5

30 3.4 4.5 5.2 5.9 6.9 7.9 9.2

32 3.3 4.4 5.1 5.7 6.6 7.6 8.8

40 3.0 3.9 4.5 5.1 5.8 6.6 7.6

Pipeline’s diameter

8 15 20 25 32 40 50

½ ¾ 1 1 1½ 2

∆T

[°C]

["]

[mm]

Insulation thickness

λ = 0.035W/mK

heating cable

Heating cables can be positioned along pipelines:

• in a single run,

• in a double (or multiple) run,

• spirally.

temperature sensor

The table data has been estimated under

the following assumptions:

• polyurethane foam insulation

of the given thickness

(from 10 to 40 mm),

• ∆T - 30°C: temperature difference

between the in-pipeline set

temperature and minimum

external temperature.

After heat losses will have been determined,

the heating cable’s selection can commence.

The heating cable should provide the system

with the heat output at least equal or higher

to estimated heat losses. When selecting the

heating cable’s length, it is necessary to

account for the cable positioning options.

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