【 Weak current College 】 on hydrant selection, design and maintenance

Fire hydrants as their name implies, is in the event of a fire disaster Fire Department for water fire extinguishing of a device. Fire hydrant species may roughly be according to the following classification, generally by hydrants: indoor hydrant and hydrant. Press fire hydrant installation forms can be divided into aboveground and underground. According to the number of minutes the fire hydrant outlet, dual-port-type and three outlets, etc. Fire hydrant is normally installed on the municipal water supply pipe network, according to the municipal water supply pipe network design specification, hydrants hydrant spacing should not exceed 120 meters, therefore it is no less than the quantity of water distribution valve, water supply pipe network one of the important facilities.

The special role of the fire hydrant determines its management in municipal water supply pipe network unique, it is different from the municipal water supply pipe network of other facilities, its use, maintenance, management by water supply companies. And the fire hydrant exception, its use is largely satisfied with the use of fire management, maintenance, management of the water supply enterprises themselves. Few urban fire hydrant maintenance management by the fire department. Fire hydrants as a soldier, is "1", and using the yangbingqianri fire-fighting water control devices. In the event of fire must meet the requirements for fire department water fire extinguishing, and as the fire hydrant maintenance management departments, the fire hydrant management responsibility is extremely heavy.

Fire hydrants as municipal water supply pipe network of important facilities of its connection with the distribution network with leading level in the Special Branch pipe, the establishment of control valve to connect the fire hydrant wells fire hydrant Chamber is located next to the main water pipe wire. There is also a fire hydrant established in non-dedicated to the fire hydrant branch pipes, often with the master valve installed in a well indoor, commonly known as fire hydrant set well. That is connected to the valve and hydrant except when you want the fire hydrant valve shut off function implementation, at the same time also played on the downstream pipe flow control for installation, maintenance, etc. There are also direct in transmission and distribution piping on the tee, fire hydrant-up to the pipe back in the form of installation. With the urban architecture, population density, as well as fire-fighting equipment (mainly refers to the fire engine) specification changes to improve performance, all underground fire hydrant outlet diameter was chosen as φ 100 m X 100 m S — and past-SX-65 and gradually withdrew from the city water supply network.

Many water supply companies in the water-supply facilities management only attach importance to the implementation and management of the valve, the valve on the pipe well good water supply networks, and often in the management of a fire hydrant is ignored. Everyone knows fire hydrant management once the behaviorist, consequences and causes greater social impact. This should have caused the fire hydrant maintenance management responsibilities of the water supply enterprises of vigilance.

To ensure that the fire hydrants in the use and maintenance management, selection from a fire hydrant, fire hydrant, fire hydrant installation routine maintenance management aspects.

First, the fire hydrant selection

1. Select the underground fire hydrant and aboveground fire hydrant should be suited to local conditions. In the municipal water distribution in some urban water supply for fire hydrant planning set stressed with underground, and some cities are from the original underground and all transformation to the ground. There are hidden underground fire hydrant, and does not affect the city beautiful, damage situation, cold zones to antifreeze, etc. But as the use and management of the sector concerned, not very convenient for maintenance, easily building parking etc buried, covers, pressure, a large number of underground fire hydrant need well room protection, funding, while in urban underground pipe network planning in occupies a lot of location, to the planning difficult. But the contrary, the aboveground fire hydrant more eye-catching, easy to find, use and maintenance more convenient, but vulnerable to damage, easier to use water caused theft. If the real press specifications 120 m sets a fire hydrant, is bound to cause some urban streetscape. Fire hydrant is mainly used for fire extinguishing water intake, so to speak as a fire hydrant use sector, how to quickly find a fire hydrant, water fast, convenient, easy to be fire department's wishes and requirements. It is necessary to meet the use, but also to consider the appearance of the city, King, but also conducive to the maintenance and fire hydrant should be suited to local conditions, combined with underground floor. And the fire hydrant's specifications do not too many, is easy to use and maintain.

2. fire hydrant outlet diameter shall not be less than 100 m m φ. With the urban architecture and population density increases the difficulty of the fire, in order to ensure that the extinguishing water pressure water requirements, must ensure that at least one fire hydrant outlet diameter φ 100 m is m.

3. a fire hydrant and close should be conducted in unity, should be clockwise closed anticlockwise. The screw should be made of stainless steel, sealing Cup selection EPDM or acrylonitrile-butadiene rubber, cavity internal coating should meet drinking water health indicators, etc., should be consistent with the valve requirements.

Second, hydrant installation design

1. floor-fire hydrant installation design, design considerations should be installed in the streets of the crossroads area, while ensuring visible without affecting the pedestrian, vehicle location, taking into account the maintenance and daily drainage outlet convenient. If the sidewalk Street along, rainwater discharge near the people side of street trees. Some ground-fire hydrants as originally installed and then road elevation change, will the discharge port the fire hydrant was earth burial, blocked and cannot discharge, causing a fire hydrant Chamber in water quality changes, such as corrosion, impact screw water and hydrant service life.

2. underground fire hydrant installation design. Underground fire hydrant design installation at underground Interior, fire hydrant outlet altitudes and outlet flat position on water is convenient is the key to draw water from the Fire Department, then bring the outlet from the ground level should be controlled at about, consider maintenance 30cm, convenience outlet flat location should be close to the mouth of the River. If the fire hydrant wells in deep, fire hydrant connection risers is too long and should be well within the standpipe be fixed to ensure that the safety in use.

3. for super high-rise building around the hydrant nearby, consideration should be given to the fire hydrant and super high-rise building of pump adapter spacing, so that once the super high-rise building fire, the fire department can in the shortest possible distance water and pump receivedBelt.

4. due to the planning and other factors, often have the control valves and fire well function as a set of well known, habits, seems saving planning location, and a dual-function well, but it also brings the management of the disease. First, once the fire hydrant maintenance you need closing valve normal supply and the impact on downstream. For the same reason maintenance when closing valve downstream piping and hydrants to normal use, it's normal usage of the fire hydrant will reduce. This is "breaking out of the fire hydrant at" using the management is very negative. Second, because the wells have a dual function, which covers how to fire well cover or valve covers and bring management using confusion, design should, as far as possible, avoid this set of wells.

The management of the three, fire hydrant

1. fire hydrants as one of the network, its subsidiary facilities management should be equivalent to other facilities management, should establish specialized management team, dedicated management. Once you have found the fire hydrant failure should be assimilated to the pipe network to timely processing of snatching explosion. In addition it should also be drawn up on the fire hydrant maintenance plan of the cycle, the implementation of the maintenance of the measures on a regular basis. Ground-fire hydrant should also be regularly to ensure that the paint coating. Periodically fire hydrant for drainage operation check, on the one hand, to determine whether effective, open and close, fire hydrant water water meets the normal category. On the other hand in the water distribution network is also played by fire hydrant drainage improvements to ensure that water. In implementing the fire hydrant drainage work, to ensure that drainage effect and prevent network quality secondary pollution, drainage hose received should be taken when drained to rain water wells. The quality of the drainage of water sample testing field, mainly for the determination of turbidity, chlorine, water quality indicators, in addition to the drainage pipe pressure measurement records accumulated net service pressure parameters for network operation for the parameter.

Through the fire hydrant water drainage improvements to ensure that the fire hydrant security operation is necessary, but at the same time to the problems caused by water supply companies are water supply companies tap water production and sales increase correspondingly poor, how economic reasonable scientific drainage management is the water supply enterprises should examine the issue of worth.

Chengdu water Division fire hydrant management, according to the fire hydrant settings, field emission conditions and fire hydrant the pipeline material conditions and regional water situation in the different levels of water management, context-specific implementation of minutes cycle time sharing and focus on emissions, and seek the Holy blissful martyr time, at the time of discharge pressure, etc., in order to facilitate the calculation of displacement of lecturers and accurate, with individual water supply enterprises on each hydrant with a meter metering, abroad have similar practices. But after installing water meters with increased management complexity, this practice should be considered carefully.

2. fire hydrant wells with other facilities as well, often likely to be faced, retaining, buried, pressure, in addition to step up inspections, it should also be made for the fire Statute of publicity and guidance. In particular, should work closely with the local fire department, and rely on the Fire Department of the execution of the maintenance and management of good fire-fighting facilities. Fire departments in the area of fire management, water supply enterprises fire hydrant maintenance management should also Fire Department of regional management, common management, help with less effort. Chengdu water Division fire well cover on spray rinse yellow paint be alert, facilitates the search for maintenance, but also to stand out, to help fire departments use the method value line extension. Of course there are conditions should also be fire well cover brushing into fluorescence, reflective markers to find at night.

3. fire hydrants as one of the water supply network facilities, to establish and improve their profile information is the key to fire hydrant manage their archives should include single cards, maintenance records, the daily inspection records, etc. Conditional should establish fire hydrant management information computer system, improving the management of the fire hydrant.