【 Weak current College 】 smoke control system in the exhaust gas volume causes of insufficient

Fire is easy to produce large quantities of gas, smoke, with toxic and terror, seriously affect the evacuation and fire-fighting and rescue operations endangers the very large, is the fire resulted in the loss of one of the major factors. Therefore in high-rise buildings, underground building and petrochemical enterprises, e-workshop is generally required to have smoke facilities, but from the Fire Department for fire-fighting facilities inspections, these buildings smoke exhaust volume often does not meet the requirements. Analysis of the main reasons are:
First, the exhaust vents are located in the outdoor, rain and prevent birds entering, generally in the exhaust port with bird bar and rain 100 pages, such as set the rain 100 pages, the resistance of the great, the room located in the exhaust gas outlet does not directly toward the window, but the alignment of the wall, it will affect the discharge of flue gas.
Second, the smoke machine is based on the amount of exhaust smoke spot number required, take a smoke partition exhaust or clearance height is greater than the designated fire zone 6m not rooms should be not less than per square metre area 60m3/h, with two or two smoke partitions and atrium volume size, such as design time without reservation or purchase is not just fan specifications directly affects the amount of exhaust smoke.
Third, the smoke machine during transportation or transported to the construction site is subjected to collision resulted in the exhaust fan casing deformation can also affect the amount of exhaust smoke.
4. smoke fire valve quality is poor, insufficient internal spring tension, when the flue gas flow valve slice cannot maintain standards and have the effect of the skew angle, through the flue gas.
5. exhaust air pipe, in order to shock, General are equipped with soft joints, soft touch with hard tube fitting loosely, often smoke leakage phenomenon.
6. some fan installation and piping installation impact dislocated, the flue gas flow.
VII. flue gas pipeline leak connectors, individual adopts inorganic or flame retardant, glass fiber wind pipes in smoke machine started even rupture.
8. pipe is too long, bend angle, resistance, impact of smoke flow rate.
9. pipe resistance, pipe a snakeskin bag, plastic and other debris not cleaned, there is a brick wall of exhaust is not painted, not smooth, cause resistance.
10. pipe specification, pipe cross sectional area and design section should match, because there are other pipeline installation and reduce conflict, pipe cross sectional area, the impact of flue gas throughput.
11. exhaust port specification and design specification, the amount of natural gas will be reduced.
12. exhaust port settings control valve, exhaust valve of the plate, and most have a linkage, the linkage is opened not full open, the impact of flue gas discharge.
13. check with the anemometer is national fire research institutions selected product, but use a long time, the speed might not be accurate.
14. check the anemometer is placed in position, distance measuring wind speed may also have a certain impact, resulting in the measured data are not allowed to affect the calculation of the exhaust gas.
In view of the above problems, fire departments should be from the following aspects to strengthen building smoke facilities design and construction supervision:
1. strengthen smoke design construction personnel business mentoring and training. As the Fire Department for fire alarm and General Electric, fixed (auto) fire-fighting facilities design and construction of business mentoring and training very seriously, but often overlooked smoke facilities design training, therefore, enhance the design of the training, you can solve the inherent design issues that reduce risk.
2. implementation of smoke control facilities construction by fire facilities construction units. Smoke management facilities is building automatic fire-fighting facilities, an important part, in accordance with the provisions of its construction by fire facilities construction units, but there are many items of smoke control facilities construction by air conditioning professional construction units or civil units responsible for the installation, its fire requirements are not familiar with how the linkage is not clear, therefore, must be made by professional unit construction, so as to ensure that no problems during construction.
3, fire supervision departments of the examination staff at construction drawing examination, should focus on smoke control facilities design review, focusing on the natural smoke exhaust window settings, window size, mechanical smoke extraction facilities set parts, fan selection, the air exhaust port settings, smoke partition content review, while in construction on smoke control facilities construction site supervision, will smoke facilities as construction supervision and inspection of important content, make timely detection of problems, guidance, supervision and construction units for rectification.
4, construction unit should, in accordance with the Fire Department audit opinion, according to the map construction, cannot change the location of the building structure, air blower, air pipe, exhaust port installation location, the only way to ensure that the relevant parts of the exhaust gas volume reach requirements.