Installation Manual of heat tracing cable

No distortion, tangle, repeated bend is allowed when storing, handling, installing or using electric heating cable. Damage of outer sheath or insulation is strictly forbidden 

Check the appearance and insulation before laying the electric heating cable. The insulation resistance values shall conform to the values stated in product manual.

When laying the electric heating cable, do not make the hard fold or drag it on the floor at long distance

When fixing the electric heating cable, leave some space for reaction so that it will not break down due to expansion caused by heat or contraction caused by cold, so as to avoid short circuit

The power supply connected to the electric heating cable should be consistent with the work voltage as required 

Make sure the voltage is stable to avoid electric heating cable is frequently switched on and off

 If the terminal box is installed outdoor, it should be reversely placed in case rainwater dropping into the box, resulting in any safety problem

Follow electric heating cable product property. For example, follow the maximum application length: 100M for industrial application & 30M for civil application while the low-voltage electric heating cable is 30M.

After the electric heating cable is installed, check the circuit safety before installing the insulation layer. Pipe tank with fire resistance and high tracing heat must be used and the insulation material should be cautiously considered & selected
 

1. Electric heating cable should be placed closely beneath the pipe or winded upon the pipe. Use aluminum adhesive tape; for every 0.5~0.8m, use heat-resisting adhesive tape to fix the electric heating cable at the radial direction. The electric tracing cable laid paralleling to pipe is usually installed beneath the pipe, and keep 45°angle to the horizontal axis of the pipe section. If use 2 electric tracing cables, they are required to be symmetrically laid.   

2. The minimum bending radius when install the electric heating cable should be no less than 5-6 times of the thickness.

3. When connecting the wire, electric heating cable should be correctly secured in place, to avoid short circuit. At the same time, connect the mesh grid to secure the ground connection. 

4. Burr or sharp corner should be removed from the pipe or container surface in order to protect from any damage to tracing heat cable during installation process. The rust-proof and antiseptic coating should be dry; tracing cable model should be consistent with the design requirement

5. For about every 50cm, fix the electric heating cable onto the dry pipe with fiberglass pressure sensitive tape or aluminum adhesive tape. When laying the electric heating cable, try to attach it at the position 45°under the pipe

6. Reserve 1m electric heating cable at the first power supply terminal and the end terminal of the circuit; leave certain length of the electric heating cable at all the radiators such as the stand, valve, flange, etc, in order to make it convenient for removal, maintenance, or replace at any time whenever it is needed.

7. Wherever there is 2-way or 3-way accessory used, each port should be reserved with 40cm length of the electric heating cable. Power supply point should be reasonably selected for multiple electric heating cables to make maintenance convenient. 

8. Ribbon cable installation should be proceeded with only after the pipeline system is completely installed and it is hydrostatically approved. Construction of insulating layer can only be started after the electric heating cables are completely installed, regulated, tested and proved with normal delivery of current

9. After the above installation is completed, insulation test should be conducted to make sure the resistance between wire core of the electric heating cable and the mesh grid is consistent with the product manual

10. Material of the insulation layer should be dry and quality & thickness should be secured. Waterproof cover should be added and caution mark should be indicated with “electric heating cable inside” outside insulation layer

11. When installing on the container, the electric tracing cable should be winded upon the middle and lower section of the container, usually not exceed 2/3 of the container height, normally 1/3

12. When install the electric tracing cable, possibility to remove the pipe accessory and equipment should be thoroughly considered, in order to make sure the electric tracing cable will not be damaged

13. It is required the rubber gasket, washer, and fastener should all be available and in integrity status when installing the accessory. Installation should be correct, secured to avoid loose or water getting into the box

14. In humid and corrosive environment, enhanced or the electric tracing cable for marine use must be adopted. 

Precautions should be paid attention to for special industrial pipe and different materials:

When steam blowing the apparatus pipeline, it must be conducted 2h after the power supply is disconnected and the blowing temperature should no more than 200℃ for long time. If the temperature is too high, a layer of heat-protecting blanket can be placed outside the pipeline in advance before laying the electric heating cable to prevent it from being burnt due to high temperature 

For electric tracing of nonmetal pipe, a metal sheet (aluminum foil) should be added between the outer pipe wall and the electric tracing cable to improve the heat tracing effect

For apparatus pipe, do not connect the electric heating cable directly to the apparatus pipe, or otherwise it will cause the electric heating cable frequently switched on and off and then result in excessive electric current, which possibly may contributes to core cable hi-pot issue    

Installation Procedure of Electric heating cable 
 

Use fiberglass pressure sensitive tape or aluminum adhesive tape to fix the electric tracing cable onto the pipe at every 50Cm

When laying the electric tracing cable, try to attach it onto the position 45°under the pipe

Reserve 1m of electric tracing cable respectively at the first power supply terminal and the end terminal of the circuit

Arrange the wire according the design drawing [winding coefficient](if the coefficient is an integer number, use parallel laying to reduce connection points)

For all the radiators (such as stand, valve, flange, etc), leave a length of the electric tracing cable as the design drawing required. Wind and secure this length of the electric tracing cable onto the radiator main body 

* The radiator should be with design required length of the electric tracing cable

* The electric tracing cables can be piled & folded upon each other or alternatively placed

* When binding, try to make the radiator easy and possible to be removed for repair or replace at any time whenever necessary, so as to avoid damage to the electric tracing cable or impact any other circuit

* Wherever there is 2-way or 3-way accessory used, each port should be reserved with 40cm length of the electric tracing cable.  
 

Installation procedure of single electric tracing cable

Use fiberglass pressure sensitive tape or aluminum adhesive tape to fix the electric tracing cable onto the pipe at every 50Cm

When laying the electric tracing cable, try to attach it onto the position 45°under the pipe

Reserve 1m of electric tracing cable respectively at the first power supply terminal and the end terminal of the circuit

Arrange the wire according the design drawing [winding coefficient](if the coefficient is an integer number, use parallel laying to reduce connection points)

For all the radiators (such as stand, valve, flange, etc), leave a length of the electric tracing cable as the design drawing required. Wind and secure this length of the electric tracing cable onto the radiator main body 

Following cautions should be paid attention to:

* The radiator should be with design required length of the electric tracing cable

* The electric tracing cables can be piled & folded upon each other or alternatively placed

* When binding, try to make the radiator easy and possible to be removed for repair or replace at any time whenever necessary, so as to avoid damage to the electric tracing cable or impact any other circuit

* Wherever there is 2-way or 3-way accessory used, each port should be reserved with 40cm length of the electric tracing cable.

If the winding coefficient is 1.4, in other word, 5m pipe needs 7m electric tracing cable, secure the both ends of the 7m electric tracing cable onto the 5m pipe, wind the loose electric tracing cable onto the pipe and then fix it.

Design drawing indicates the winding coefficient is (n=1，2…) ordinarily used for large diameter pipeline

 Method is as below:

* The electric tracing cable is wired from one end of the pipeline to the other end and then turned back to the start point with route equal to the coefficient (pay attention to the maximum application length).

* The electric tracing cable is wired in turn from one end of the pipeline to the other end.

* Back-up system, the key pipeline is used as the back-up approach for emergent situation, so each circuit should be considered as an independently circuit device with separate power supply terminal.

Typical electric heating cable installation illustration