Flexible Pipe Heating Test Using Metallic Armour and Optical Sensing

The patent combines the heating system test and temperature monitoring system test into a single integrated testing method. Electric current is sent through the metallic armour layer to generate heat, while thermal sensors simultaneously measure the temperature profile. This merging of multiple test functions into one procedure validates both heating and monitoring capabilities without requiring separate complex testing equipment.

The metallic armour layer serves multiple functions: it provides structural reinforcement, acts as a heating element through resistive heating, and serves as a conductor for electrical current during testing. The thermal sensors simultaneously perform temperature measurement and monitoring. This multi-functionality allows comprehensive system validation using existing pipe components rather than requiring additional specialized test equipment.

The heating and temperature monitoring systems are tested during the factory acceptance test phase before the pipe is delivered and put into service. This preliminary testing ensures system functionality is validated while the pipe is still at the manufacturing facility, avoiding the need for separate testing operations later during installation or operation, thereby reducing overall time loss.

The testing method uses the existing electrical and thermal systems continuously during the test procedure. Electric current is applied and temperature is monitored simultaneously in a continuous manner rather than through discrete separate measurements, optimizing the use of system components and minimizing test duration while ensuring comprehensive validation.

The patent implements a feedback-controlled testing method where thermal sensors continuously monitor the temperature profile along the pipe while electric current is applied. The temperature measurements provide real-time feedback that allows control of the heating process, ensuring the temperature remains within safe limits. This feedback mechanism prevents overheating by allowing immediate adjustment or termination of current application if temperature thresholds are approached.

The patent replaces direct mechanical contact temperature measurement methods with optical or electrical thermal sensors that measure temperature remotely through radiation or electrical resistance changes. This substitution allows for non-contact or minimally invasive temperature measurement, reducing the risk of introducing heat or mechanical damage during the testing process while maintaining measurement precision.