Regular testing and upkeep guarantee a most service life and functional and failure-related safety of technical appliances. The same applies to foam-based hearth extinguishing methods and the foam proportioners put in in them.
Up to now, such testing and upkeep have required the presence of personnel on-site. However, it might be easier and more cost-efficient for extinguishing system operators if this was attainable in a totally automated and remote-controlled manner. For instance, this may additionally make common upkeep personnel journey to remotely situated proportioners redundant. In addition, this may ensure that necessities by the producer, standards and units of rules are observed without any useful deviations and unsuitable time intervals.
The distant testing system inside the ‘Smart Proportioner’ improvement framework has been created only for this objective. It is an advancement of the remote monitoring system.
Brief overview of the distant monitoring system
The distant monitoring system is used for proportioner monitoring in testing mode during maintenance and live firefighting operations.
In the course of distant monitoring, the proportioning price and different working parameters are decided, recorded and forwarded to the system operator if necessary. Thus, the smooth functionality and operational readiness of the system are monitored and ensured this way.
A remote monitoring system consists of a control system, including an optionally available local show unit (HMI) if applicable, and sensor know-how. The sensor expertise consists of, as a minimum, the possibility to determine the water motor’s number of revolutions and to determine the froth agent flow fee. These values are used to calculate the proportioning rate. This figure is the core attribute during the operation and testing of a foam proportioner. Further sensor know-how is on the market on an optionally available basis.
The distant monitoring system helps the operating and service personnel on-site. It can be appropriate for remote monitoring of the foam proportioner.
However, it’s a basic fact that personnel are at all times essential to carry out the maintenance work or the proportioning price testing on-site because the system performs a monitoring position solely. 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 determined, displayed and forwarded. Images supplied by Author / Contributor
Evolution – from remote monitoring to distant testing
The query is how to additional reduce the upkeep effort on foam proportioners.
The solution lies in the remote testing system, the subsequent step of the intelligent FireDos proportioners. The remote testing system allows monitoring of the proportioner and individual maintenance, together with proportioning fee testing.
The situation of the proportioner may be checked without having to begin out 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 may be checked without upkeep employees and associated bills, similar to journey expenditure. In specific, growing the testing interval is possible with out extra efforts. The instruction handbook for FireDos proportioners requires common starting-up, utilizing the service crank manually at the least. This is intended to stop deposits contained in the gear, impairing its ease of motion and thus conserving the proportioner’s functionality. The distant testing system can undertake these regular actions and check the proportioning rate, increasing the service life and functional safety of the proportioner.
What is the design of a remote testing system?
The remote testing system is mostly based upon the remote monitoring system. It is, nevertheless, particularly prolonged by way of actuators. This is because they permit the completely independent operation of the remote testing system; i.e., the proportioning price of the proportioner is tested with out activating the water pumps of the fireplace extinguishing system.
The core components embrace a central management system, with an optionally available HMI, sensor expertise, 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 will have no interference with the proportioner’s performance within the case of a fireplace. This means, the benefits of the mechanical proportioning principle are preserved.
How does the distant testing system work, and the way can the proportioning rate be checked without activating the water pumps?
If in ready-to-operate mode, the proportioner is all the time within the proportioning position. Upon initiation of an automated testing process, regardless of if after an outlined time interval, upon request by way of a cloud answer or from the fire extinguishing system/a native operator, the proportioner is put into testing operation. Specifically, the control system places the proportioner into testing operation using an electrically actuated ball valve drive while the foam agent just isn’t mixed into the extinguishing water however returned to the froth agent tank. At the identical time, it opens the electrically actuated ball valve within the bypass line past the water motor. Next, the electric drive of the proportioner is activated, driving the complete proportioner at its start-up flow rate. The start-up move price is the lowest operating level of a proportioner to reach its nominal proportioning price.
Due to the external electrical drive, the water motor works like a pump and generates a water circulate through 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 subsequently not influenced when the proportioner is tested.
As the extinguishing water flow rate simulated by the external drive can also be known because of the identified ratio of the water motor’s number of revolutions and the water flow price, just the froth agent move rate must be determined to permit the following calculation of the proportioning price. This is finished by a volumetric move meter between the proportioning pump’s outlet and the ball valve, which switches between returning and proportioning mode. This allows determination of the froth agent flow price, each in testing mode and whereas proportioning in case of an alarm.
The proportioning rate is set in accordance with the formula as required in the requirements and laws EN 13565-1, NFPA 11, FM 4-12, and the Nordtest NT Fire 042 method.
Foam agent flow rate [l/min]
(Extinguishing water move price x a hundred = proportioning rate %+ foam agent move rate) [l/min]
After completion of the testing course of, the electric drive of the proportioner stops, the bypass line is closed, and the proportioner is returned to proportioning mode.
Sensor technology installed as an additional option or inside the electrical drive permits obtaining additional information and conclusions about the state and situation of the respective unit. It is checked, for instance, whether the ball valves are of their correct positions or sufficient oil is within the crankshaft housing of the proportioning pump. In addition, the pressure values on the pump inlet/outlet and the pressure on the water motor are recorded. Finally, measuring the complete system’s torque and the move fee inside the bypass line allows checking the general condition of the proportioner.
The data may be displayed regionally or by way of a cloud answer. Controlling the upkeep operation can additionally be attainable via each interfaces.
What if there could be an alarm throughout a testing process?
An necessary query is: Does the proportioner work with none limitations and as traditional if there could be an alarm? The reply is: Yes!
The remote testing system is designed in such a way that extinguishing water can circulate through the water motor and begin it up at any time, even when the electrical drive is working on the same time. In addition, a unique, totally automated and purely mechanical decoupling mechanism ensures that the electrical drive doesn’t interfere with the proportioner’s functioning and readiness to operate.
In case of an alarm, the ball valves within the bypass line and those 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 capabilities not necessary at that second and all ball valves to be set to their appropriate place.
Therefore, in case of an alarm during testing operation, the ball valves swap to their correct place fully mechanically and the electric drive is switched off. Even if the electrical drive is still operating or coming to a cease, the extinguishing water can circulate through the water motor and drive the proportioning pump without limitations. The alarm mode of the management system prevents re-activation of the electrical drive or any unintended ball valve switching.
What advantages does a distant testing system provide?
Compared with normal proportioners and people equipped with a remote monitoring system, a remote testing system provides varied advantages. They function the next:
ν Proportione
Display view for testing operation of the FireDos distant testing system. Images provided by Author / Contributor
cian have to be on-site.
Regular proportioning rate testing: Regular proportioning rate testing ensures optimum functioning of the proportioner in case of a hearth. If the proportioning fee is simply too low, the extinguishing success could be compromised. Overdosing causes the froth agent to be consumed faster than intended, leading to the untimely ending of the froth operation.
Increasing practical and failure security as a outcome of elevated testing intervals: An elevated check 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 within the proportioner or components of the extinguishing system, instantly affecting the proportioner’s functionality, could be recognized at an early stage of time. This consists of, for example, pressure variations in the extinguishing water line or a jammed suction line.
Inclusion of all functions and advantages of the remote monitoring system: All features and advantages of the remote monitoring system are additionally current within the remote testing system, i.e. all related operating parameters are recorded and processed repeatedly and accurately in addition to documented in a log file. In addition, all information are displayed by a visualization.
Reduction of costs: Regular functional testing makes it possible to detect faults even earlier. This means, maintenance and repairs can happen earlier than any extra critical injury happens. The increased performance and fault security of the proportioner ensures that the service lifetime of the proportioners is maximized and the chance of a failure is minimized. As a outcome, lowered service and operating workforce on-site scale back prices significantly, notably if the proportioner is located in a distant place. In addition, useful testing of the proportioner permits early identification, analysis and probably limiting a fault remotely. This makes service visits extra environment friendly and subsequently cheaper.
เกจ์วัดแรงดันแก๊ส and prospect
The distant monitoring system already supplies varied benefits and helps cut back prices, nevertheless it cannot cut back the workforce required on-site.
The remote testing system is an answer for reducing maintenance requirements. It is the next evolution in the midst of growing intelligent FireDos proportioners.
The remote testing system allows reducing the workforce required on-site to a minimum, together 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 upkeep by personnel on-site is important, apart from an oil change. The oil change may be carried out by the operator’s personnel, too, simply and with none deeper data of the working precept of proportioners. If a service go to or repair ought to nonetheless turn into needed, remote monitoring and early fault detection will make the planning and completion of such work more environment friendly.
Like the remote monitoring system, the distant testing system is an optimum symbiosis of mechanical proportioners and an intelligent electronic upgrade. Thus, the benefits from each expertise fields are mixed with out compromising the performance of mechanical FireDos proportioners.
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