ELEKTRA FreezeTec 12/3 Manuale - Pagina 6

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Installation tape

(available with the heating set)

The coefficient found in Table 2 for the a.m. parameters is 1, therefore, the

heating cable will be laid along the pipe. Next, ELEKTRA FreezeTec™ 12/15

heating cable 15 m long is selected from Table 1. The cable length exceeds that of

pipe by 1 m. The additional length of 1 m is used for valve heating while the

remaining length of cable is laid along the opposite side of pipe.

The cable may also be wound with small pitch around the pipe so as to use the

whole cable length.

Example 2

12 m long 32 mm DN pipe (outer diameter of the pipe - 42 mm).

- 10 m thick insulation;

- min. ambient temperature: -25°C;

- the pipe has no flanges, valves etc.

The value of coefficient (Table 2) for the a.m. parameters is 1.5. Therefore, the

length of heating cable will be: 1 2 m x 1,5 = 18 m. ELEKTRA FreezeTec™ 12/21

heating cable 21 m long is selected. The cable should be helically wound around

the pipe. The pitch [p] may be calculated using the following formula:

When the coefficient specified in table 2 has the

value 1, the heating cable should be laid along

the pipe (Fig. 2a). If the coefficient exceeds 1,

the heating cable shall be wound around the

pipe barrel (Fig. 2b).

Example 1

14 m long 20 mm diameter pipe;

- insulation thickness: 10 mm;

- min. ambient temperature : -15°C;

- the pipe is to be fitted with a valve.

where: D - outer diameter of pipe

d - dimension of heating cable

L - heating cable length

L - pipe length