【 Weak current College 】 fire pump cycle pump applications

In a variety of fire-fighting system, water extinguishing systems occupies a very important position. Whether in a temporary high pressure system or in low-voltage supply systems, in-fighting during the fire with water, mainly rely on the fire pump continuously draw water from the fire.
Water fire extinguishing system indoor hydrant system is building the most basic fire-fighting equipment. Because it is located in a building, close to the ignition point, which is the initial fire fighting building a powerful weapon. While each hydrant quality is good or bad, the key is whether the water hydrant, pressure to meet the needs of the fire. This requires the discovery of fire should start as soon as possible after the fire, the water hydrant, fire-pressure reached. Thus, the senior civil building design fire protection standard (GB50045 a 95) and building 7.4.6.7 design fire protection standard (GB116 a 87), article 9 paragraph 8.6.2 provides: "tall buildings temporary high pressure water supply system in each hydrant Department, senior industrial buildings and tanks cannot meet the most negative point fire hydrant water pressure of other buildings, each hydrant is set at the start of the fire pumps directly. "Therefore, the building of the fire box office, Kai pump button because the first line in the fire, directly facing the fire, the fire pump control effects will have a direct bearing on fire pumps for people running speed, in a building at an early stage of fire suppression in the pivotal role.
Currently, many of the fire protection system is being used, owing to the system design and construction of an earlier time, the system functionality is not perfect, the fire hydrant Kai pump button electric control action program does not meet the fire code requirements of Kai pump directly. The more common practice is to: the fire hydrant Kai pump button as a alarm points, when you press the restart button, followed by the pump fire alarm controller receives the alarm signal, the controller's internal software after treatment is transferred to linkage control equipment, and is automatically State linkage control devices to the fire pump house pump control cabinet issued Kai pump signal (or after receiving the alarm signal from the on-duty staff manually start the linkage control cabinet of restart button to fire pump pump house pump control cabinet release cycle pump command), and finally by the pump control cabinet started the fire pump. However, the author through the survey found that such a system in actual operation and unreliable, major flaws:
(1) on the system hardware equipment reliability, stability, high accuracy requirements. Automatic fire alarm system is a relatively complex online real-time control systems, with the running time of growth, system equipment components aging and damage occurs; if maintenance is not prompt, it is easy to cause a system failure or a false positive, even paralysis of the system to run. So, maintain in automatic fire alarm system restart the pump button is not working properly, fire pumps will not be able to start as soon as possible.
(2) on system software device runs a high reliability requirements. Because the system will fire hydrant Kai pump button signal as a warning signal, therefore requiring automatic fire alarm system must be a signal with a large number of fire detectors and alarm signal issued by, and to distinguish its processing to the linkage control system. This process in writing software is cumbersome, error-prone, and any small errors can cause a false fire pump start or does not start.
(3) on the system's operating status is critical. To restart the pump button signal as a warning signal of the system, its whole system (including coordinated control system) must always be a State automatically. If any of the links in the system is in a State, when reboot manually pump button starts, fire pumps will not boot.
(4) for the fire service duty staff in the control room manual start fire control pump of the system, control room must be on duty 24h. But in the actual operation is part of the unit is not guaranteed to be on duty 24h. Even if someone is on duty, duty person as a result of special things to leave, it will delay the start of the fire pump.
For this kind of indirect fire control pump of the system started, if strictly according to the fire hydrant button direct cycle pumps for rectification, is bound to replace the fire hydrant buttons and increase the laying of the control line. This on many systems in use, because the Interior is decorated for the rectification of great difficulty. To address this situation, in order to achieve as soon as the fire starts fire pump, fire hydrant system of water, water pressure to meet the requirements of the fire, the author makes the following recommendations:
(1) if in the "start the fire pump" and "display fire hydrant Kai pump button location" feature, you can only take a moment, should give priority to select the direct starting fire pump ", i.e. the original display fire hydrant Kai pump button location of signal receiving fire pump control cabinet as Kai pump signal in order to achieve the purpose of direct cycle pump.
(2) If you really cannot do direct start the fire pump "(even if the Cancel button in displays fire hydrant Kai pump action location" feature), you can fire pump room equipped with pressure switch or guages and directly connected to the fire pump control cabinet, ensure that the pipeline pressure drops to the set pressure value can be directly started the fire pump, not a single pass fire control cabinet to start the fire pump.
Both of these suggestions are also present certain shortcomings: the first improvement suggestions, fire control room was unable to determine the source of the Kai pump signal, sometimes even on-duty officers do not know the fire pump has been started. In some easily fire hydrant Kai pump button accidentally start places such as shopping centres, entertainment venues, as well as hotels, restaurants, and other mobile workers more places, man-made cause fire pump malfunction, resulting in the fire pump damage or affect its service life, if the network protection against overpressure measures do not improve, more likely to endanger the safety of the entire system. Therefore, you need to take the necessary measures to prevent the cycle pump malfunction of button and install safety and reliable protection against overpressure unit to avoid damaging the system of regeneration; the second improvement suggestions, while made up for the people to miss the start of the fire pumps, but because of the pressure switch and guages with a certain degree of delay effects, will to a certain procedural delay the normal start of fire pumps, forfeiting fighters. Recommendations in use comprehensive consideration of various factors, cons, so as to achieve theBest use of results.