(Image: Fixing the packer above the light protection foil – Note: Illustration shows the radially cut light protection foil ) (Image: Securing packers )

• Before curing, check that the UV system/light source is suitable for the application. Confirm that the specific ignition intervals and curing speeds are available.
• Establish the basic requirements to ensure full functionality of the UV system throughout the curing process. Failure of the UV system may result in damage to the product or even product failure.
• Maintain the working pressure at a constant level throughout the entire curing process (…

• Adhere to the individual curing speeds and surface temperatures.
• Note that the surface temperature of the lining tube must be between 80 – 120 °C when using a minimum of two IR sensors.
• Cure the lining tube at the minimum curing speed (lower value from the parameter table) if the minimum temperature of 80 °C is not reached when using two IR sensors.
• Increase the curing speed by 10 % to the specified maximum curing speed (higher value from the …

Take into consideration that the ignition intervals and speeds to be used depend on the dimensions, wall thickness, and resin system of the lining tube. 

In the following, 4 ignition schemes with the designation A, B, C, and D are presented. The choice of the ignition scheme as well as the (minimum) pulling-in speed is coordinated with the supplier on the basis of specific parameter tables depending on the above-mentioned parameters.

Each ignition …

Ignition of the UV Lamps – Schema A

1. Switch the first lamp on.
2. Switch the second lamp on once the ignition interval has elapsed.
3. Switch all of the subsequent lamps on following the same procedure.
4. Switch the final lamp on and wait for the ignition interval to elapse.

(Image: Ignition of the UV Lamps – Schema A )

Pulling in the UV Light Source Chain – Schema A

1. Commence pulling in once the ignition process has finished.
2. Pull in with a speed of 35 cm/min for the first 0.5 m.
3. Increase the speed stepwise (70 cm/min; 105 cm/min) to the minimum curing speed.
4. Reduce the speed stepwise (105 cm/min; 70 cm/min; 35 cm/min) 1.5 m before reaching the end of the liner.

(Image: Minimum curing speed - Schema A)

Turning the UV Lamps Off – Schema A

1. Turn lamp 1 off after reaching the end of the liner and once the ignition interval has elapsed.
2. Switch lamp 2 off once the ignition interval has elapsed.
3. Switch all of the subsequent lamps off following the same procedure.

(Image: Turning the UV Lamps Off – Schema A)

Ignition of the UV Lamps – Schema B

1. Switch the first lamp on.
2. Switch the second lamp on once the ignition interval has elapsed.
3. Switch all of the subsequent lamps on following the same procedure.
4. Switch the final lamp on and wait for the firing interval to elapse.

(Image: Ignition of the UV Lamps – Schema B)

Pulling in the UV Light Source Chain – Schema B

1. Commence pulling in once the ignition process has finished.
2. Pull the first 0.5 m in at half the minimum curing speed.
3. Then increase the speed to the minimum curing speed.
4. Reduce the speed to half the minimum curing speed 0.5 m before reaching the end of the liner.

(Image: Minimum pulling in speed - Schema B )

Turning the UV Lamps Off– Schema B

1. Turn lamp 1 off after reaching the end of the liner and once the ignition interval has elapsed.
2. Switch lamp 2 off once the ignition interval has elapsed.
3. Switch all of the subsequent lamps off following the same procedure.

(Image: Turning the UV Lamps Off – Schema B)

Ignition of the UV Lamps – Schema C

1. Switch on the lamps of the first core simultaneously.
2. After the ignition interval has elapsed, switch on the lamps of the next core simultaneously.
3. If there are more than two elements repeat this procedure until all cores have ignited and wait for the ignition interval to elapse.

(Image: Ignition of the UV lamps – Schema C )

Pulling in the UV Light Source Core– Schema C

1. Commence pulling in once the ignition process has finished (Figure 33).
2. Pull the first 1.0 m at half of the minimum curing speed.
3. Then increase the speed to the minimum curing speed.
4. Reduce the speed to half the minimum curing speed 1.0 m before reaching the end of the liner.

(Image: Minimum pulling in speed - Schema C)