This applies particularly for the parallel headings near the longwall in which explosion protection has only been able to be realized under certain circumstances and, in addition, very expensively till now.
The Type ESL fire extinguishing installation already detects explosions coming from the longwall at the longwall/road transition to initiate an ignition of the connected water tanks as quickly as possible.
Through the ignition of the water tanks, which are arranged in a special mechanism in the road, the fire-extinguishing agent is effectively distributed in the road cross-section to extinguish the explosion.
The difference to other, passive explosion barriers is that the portable explosion barrier is brought into the longwall environment and the effectiveness of the explosion barrier does not depend on the blast pressure of the explosion being fought.
The fire extinguishing installation for active, portable water tank explosion barriers has the following advantages in comparison with a passive explosion barrier:
- The time-consuming Type 4.1 barrier construction up to a maximum of 30 m to the longwall is not required.
- Active explosion protection in a very small area is already available at a minimum of 35 m and a maximum of 65 m from the longwall.
- The explosion barrier is portably integrated into the power train of the parallel heading.
- When the active explosion barrier is used, the distance of Type 4.1 can be expanded to 200m away from the longwall, independent of the blast pressure of the explosion being fought.
The Type ESL fire extinguishing installation consists of an evaluation device with two uninterruptible power systems (UPS), two ignition boosters as output stages for the propellant charges, and up to four temperature sensors connected to the evaluation unit with a maximum distance of 300 m.
Due to the integrated power management, the system can be maintained via the two uninterruptible power systems in case of a power failure even over longer periods of time.
The Type ESL fire extinguishing installation corresponds to Device Group I and Device Group M1 and can thus be further operated in existing explosive atmospheres.
Since the Type ESL fire extinguishing installation is a safety-relevant system, the functional safety of the installation was also evaluated according to the ATEX guideline.
After the inspection, the installation achieved the high safety integrity level (SIL) of 2.
The installation has all communication, safety, operating, and display elements required for monitoring machinery.
With the integrated LCD display, plain text messages of all components of the fire extinguishing installation can be called and displayed online.
By means of many safety functions realised using hardware and software, the fire extinguishing installation is able to make the system safe after a dangerous incident.