Regular testing and maintenance guarantee a most service life and useful and failure-related safety of technical appliances. The similar applies to foam-based fire extinguishing techniques and the foam proportioners installed in them.
Up to now, such testing and maintenance have required the presence of personnel on-site. However, it might be simpler and more cost-efficient for extinguishing system operators if this was potential in a fully automated and remote-controlled manner. For instance, this is able to additionally make regular upkeep personnel journey to remotely positioned proportioners redundant. In addition, this would ensure that requirements by the manufacturer, requirements and sets of laws are noticed without any functional deviations and unsuitable time intervals.
The distant testing system within the ‘Smart Proportioner’ improvement framework has been created only for this function. หลักการทํางานของpressuregauge is an advancement of the remote monitoring system.
Brief overview of the remote monitoring system
The remote monitoring system is used for proportioner monitoring in testing mode throughout upkeep and reside firefighting operations.
In the course of remote monitoring, the proportioning fee and other operating parameters are determined, recorded and forwarded to the system operator if essential. Thus, the sleek performance and operational readiness of the system are monitored and ensured this way.
A remote monitoring system consists of a control system, together with an optional native display unit (HMI) if applicable, and sensor know-how. The sensor know-how contains, as a minimum, the chance to discover out the water motor’s variety of revolutions and to determine the foam agent move price. These values are used to calculate the proportioning rate. This figure is the core attribute in the course of the operation and testing of a foam proportioner. Further sensor expertise is on the market on an elective foundation.
The distant monitoring system supports the operating and repair personnel on-site. It can also be suitable for remote monitoring of the foam proportioner.
However, it is a basic proven fact that personnel are always essential to hold out the maintenance work or the proportioning fee testing on-site because the system performs a monitoring position only. It does not actively interact with the functioning of the proportioner.
In the course of distant monitoring, the proportioning fee and different operating parameters are decided, displayed and forwarded. Images provided by Author / Contributor
Evolution – from distant monitoring to distant testing
The query is the way to additional minimize the upkeep effort on foam proportioners.
The resolution lies within the distant testing system, the subsequent step of the intelligent FireDos proportioners. The distant testing system permits monitoring of the proportioner and individual maintenance, together with proportioning price testing.
The situation of the proportioner could be checked without having to start up the fireplace extinguishing system. No personnel are required on-site. Proportioners in a remote place or that are only hardly ever inspected by personnel on-site could be checked without maintenance employees and related bills, corresponding to journey expenditure. In specific, increasing the testing interval is feasible without additional efforts. The instruction guide for FireDos proportioners requires regular starting-up, utilizing the service crank manually at the least. This is meant to stop deposits contained in the gear, impairing its ease of motion and thus conserving the proportioner’s performance. The distant testing system can undertake these common movements and test the proportioning fee, rising the service life and practical security of the proportioner.
What is the design of a distant testing system?
The distant testing system is mostly based mostly upon the distant monitoring system. It is, nevertheless, particularly prolonged by means of actuators. This is because they permit the completely impartial operation of the distant testing system; i.e., the proportioning fee of the proportioner is tested with out activating the water pumps of the hearth extinguishing system.
The core components embody a central management system, with an elective HMI, sensor know-how, electrical ball valve drives, an electrical drive for the proportioner and a bypass line previous the water motor.
The connection of the electrical drive and the proportioner is designed in order that the electrical drive could have no interference with the proportioner’s functionality within the case of a fireplace. This way, the advantages of the mechanical proportioning precept are preserved.
How does the distant testing system work, and the way can the proportioning rate be checked with out activating the water pumps?
If in ready-to-operate mode, the proportioner is at all times within the proportioning place. Upon initiation of an automated testing course of, irrespective of if after an outlined time interval, upon request by way of a cloud answer or from the hearth extinguishing system/a native operator, the proportioner is put into testing operation. Specifically, the control system puts the proportioner into testing operation using an electrically actuated ball valve drive while the froth agent is not combined into the extinguishing water but returned to the froth agent tank. At the identical time, it opens the electrically actuated ball valve in the bypass line past the water motor. Next, the electric drive of the proportioner is activated, driving the entire proportioner at its start-up move rate. The start-up move price is the bottom working level of a proportioner to succeed in its nominal proportioning price.
Due to the exterior electrical drive, the water motor works like a pump and generates a water flow by way of the bypass from the water motor’s outlet to the water motor’s inlet. The operation causes no change of pressure in the extinguishing water line. The hearth extinguishing system is therefore not influenced when the proportioner is tested.
As the extinguishing water move rate simulated by the external drive is also identified because of the recognized ratio of the water motor’s variety of revolutions and the water flow fee, simply the foam agent move rate should be decided to allow the following calculation of the proportioning rate. This is completed by a volumetric circulate meter between the proportioning pump’s outlet and the ball valve, which switches between returning and proportioning mode. This allows determination of the foam agent flow rate, both in testing mode and whereas proportioning in case of an alarm.
The proportioning price is set in accordance with the method as required within the standards and regulations EN 13565-1, NFPA 11, FM 4-12, and the Nordtest NT Fire 042 technique.
Foam agent move fee [l/min]
(Extinguishing water move fee x a hundred = proportioning fee %+ foam agent move rate) [l/min]
After completion of the testing process, the electric drive of the proportioner stops, the bypass line is closed, and the proportioner is returned to proportioning mode.
Sensor technology put in as a further possibility or inside the electric drive allows acquiring additional information and conclusions concerning the state and situation of the respective unit. It is checked, for instance, whether the ball valves are in their appropriate positions or adequate oil is in the crankshaft housing of the proportioning pump. In addition, the stress values on the pump inlet/outlet and the stress at the water motor are recorded. Finally, measuring the whole system’s torque and the move fee contained in the bypass line allows checking the final condition of the proportioner.
The knowledge could be displayed locally or through a cloud resolution. Controlling the upkeep operation is also attainable through both interfaces.
What if there is an alarm throughout a testing process?
An necessary question is: Does the proportioner work with none limitations and as usual if there’s an alarm? The answer is: Yes!
The remote testing system is designed in such a method that extinguishing water can circulate via the water motor and begin it up at any time, even when the electrical drive is working on the similar time. In addition, a unique, absolutely automated and purely mechanical decoupling mechanism ensures that the electrical drive does not interfere with the proportioner’s functioning and readiness to operate.
In case of an alarm, the ball valves in the bypass line and people for switching between returning and proportioning are immediately switched so that the proportioner is in proportioning mode for firefighting. Thus, the management system is put into alarm mode in this case. This alarm mode causes the disabling of all functions not necessary at that moment and all ball valves to be set to their appropriate position.
Therefore, in case of an alarm during testing operation, the ball valves swap to their right place absolutely automatically and the electrical drive is switched off. Even if the electric drive continues to be working or coming to a cease, the extinguishing water can flow by way of the water motor and drive the proportioning pump with out limitations. The alarm mode of the control system prevents re-activation of the electric drive or any unintended ball valve switching.
What benefits does a remote testing system provide?
Compared with normal proportioners and people equipped with a distant monitoring system, a distant testing system supplies varied advantages. They characteristic the next:
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Display view for testing operation of the FireDos distant testing system. Images provided by Author / Contributor
cian should be on-site.
Regular proportioning fee testing: Regular proportioning rate testing ensures optimum functioning of the proportioner in case of a fireplace. If the proportioning rate is simply too low, the extinguishing success can be compromised. Overdosing causes the froth agent to be consumed sooner than intended, leading to the untimely ending of the froth operation.
Increasing functional and failure security due to increased testing intervals: An elevated take a look at interval causes the proportioner to be tested fully automatically at shorter intervals of time. This notably reduces the chance of a failure remaining undetected for an extended time period. In addition, extra frequent testing prevents the formation of deposits contained in the water motor.
Early fault detection and diagnostics: Faults in the proportioner or parts of the extinguishing system, immediately affecting the proportioner’s functionality, could be recognized at an early stage of time. This includes, for instance, pressure variations within the extinguishing water line or a jammed suction line.
Inclusion of all capabilities and advantages of the distant monitoring system: All capabilities and advantages of the remote monitoring system are also current within the remote testing system, i.e. all related operating parameters are recorded and processed constantly and appropriately in addition to documented in a log file. In addition, all information are displayed by a visualization.
Reduction of costs: Regular practical testing makes it potential to detect faults even earlier. This way, upkeep and repairs can happen earlier than any extra serious damage occurs. The elevated functionality and fault safety of the proportioner ensures that the service life of the proportioners is maximized and the probability of a failure is minimized. As a result, reduced service and working workforce on-site reduce prices significantly, significantly if the proportioner is positioned in a remote place. In addition, practical testing of the proportioner allows early identification, analysis and possibly limiting a fault remotely. This makes service visits more efficient and therefore less expensive.
Summary and prospect
The distant monitoring system already offers numerous benefits and helps cut back prices, nevertheless it cannot scale back the workforce required on-site.
The distant testing system is a solution for lowering upkeep necessities. It is the next evolution in the course of developing intelligent FireDos proportioners.
The distant testing system permits reducing the workforce required on-site to a minimum, along with shorter testing intervals and elevated failure security. This will increase the proportioner’s service life.
If the proportioner is in a fault-free state, no additional maintenance by personnel on-site is critical, aside from an oil change. The oil change may be carried out by the operator’s personnel, too, easily and without any deeper information of the working precept of proportioners. If a service go to or repair should still turn into essential, distant monitoring and early fault detection will make the planning and completion of such work extra efficient.
Like the remote monitoring system, the remote testing system is an optimum symbiosis of mechanical proportioners and an clever electronic improve. Thus, the benefits from both know-how fields are mixed without compromising the performance of mechanical FireDos proportioners.
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