【 Weak current College 】 automatic sprinkler system construction technology summary

【 Summary 】 automatic sprinkler system main pipe General flanged, horizontal pipe card stand at the hanger as; high water tank should be in the structure of the CAP in place before and need to do the water test; installation of alarm valve shall firstly install water control valve, alarm valve and, depending on the device manual for secondary pipes and accessories installed: pump combination device installation location must be clearly marked, valve position should be easy to operate, combining for undue obstacles in the vicinity.
【 Words】 dry pipe pipes high water alarm valve shower head branch pipe system components and shower installation
Automatic sprinkler system pipes generally use galvanized pipe and pipe fittings, pipe nominal diameter less than or equal to 100mm, thread connection should be used; when the pipe nominal diameter greater than 100mm, flanged or welded connection. Welded connections are more convenient in construction, welding and external surface is required for good corrosion protection to ensure that welding process corrupted galvanized layer is processed in a timely manner.
First, an automatic sprinkler system in the main pipe, pipe installation
1. spray the pipe flange connections for general use, the length of each pipe will not exceed 6m, straight some root can be connected together using round chain installation, construction convenient but should not be too long. Also the number of adjustable vertical, according to the order of installation of the hoisting should lift one end of the pipeline, to be stabilized and then lift the other end.
2. fastening flange pipe connection, check the flange end is clean. Use 3 ~ 5 mm rubber gasket. Fastening bolts fastening the most negative first, followed by symmetric fastening. Flange connector General installed in the location of the easy disassembly and Assembly.
3. standard installation of card cage General pipeline to hanger, each section of the main pipe generally need one prevent swaying of the hanger. Pipeline changes direction, you need an additional baffled bracket.
4. the standpipe concealed in the shafts, the tube well embedded iron in need, and then install the iron secures the card, the installation location is apart from the ground or floor distance typically 1.5 ~ 1.8m.
5. pipeline branch reserved port before the erection of precast. The use of silk received three location set aside. Welded tubes in dry mouth, all reserved port are good temporary plugging plate, prevent debris fell.
6. when the pipe reducer, generally reducing connector. Pipe elbow Department shall adopt bushing. When construction must adopt the bushing, tee 1, available on the four way, should not exceed 2.
7. water distribution pipes on each pipe segment between adjacent nozzle segment set of hanger shall not be less than 1, when the distance between the nozzle and three smaller than when you can at paragraphs L8m set, but the hanger spacing should not be greater than 3.6m. Each distribution branch pipes should be set a baffled bracket. Pipe hangers installation location should not prevent the nozzle spray effect.
Second, automatic sprinkler note several key equipment installation
(A) high water tank installed high water tank should be in the structure of the CAP in place before and need to do the water test. Fire-fighting water and water use water tank should ensure that the fire with water is not used, leaving a 10-minute fire water. Combined with the water of life, you should make the water often in a flow state, prevent deterioration of water quality. Fire water pipe should be one-way valve. All the water spout is required for the processing, if on-site precasting mouth weld welded reinforcing plate on the water tank.
(Ii) alarm valve installed installed alarm valve shall firstly install water control valve, alarm valve and, depending on the device manual for secondary pipes and accessories for installation. Water supply control valve, alarm valve and water distribution, dry pipe connection should make the direction of flow. Alarm valve block the installation location should meet the design requirements. When a design without requires time, alarm valve unit should be installed in the easy-to-use obvious location, distance indoor floor height should 1.2m, on both sides and the distance is less than the wall 0.5m, front and wall distance not less than 1.2m. Installation of alarm valve Group indoor floor drain leakage must be installed.
(Iii) shower pipe installation
1. spray head branch pipe mount ceiling type spray head of section at the end of the pipe, the pipe may not be the branch completed order dry pipe at the same time, to go hand in hand with the ceiling decoration. Ceiling joist ceiling fitted out according to the material thickness of the spray head, according to the reserved port elevation ceiling decoration figure to determine the coordinates of the spray head, making branch pipes reserved outlet position accurately done. Tube diameter for 25mm, ends the reducer hoop 25mm×15mm, pull line installation. Tube end elbow 100mm should be fixed within the card to prevent the nozzle and ceiling exposure is not strong, up and down movement. Installing your branch pipe, block reserved port with wire tighten.
2. spraying system pressure test: Seal hanging items before the system pressure test, in order not to affect the progress can be tiered ceiling decoration section. Pressure test after passing the pressure reduced to working pressure for tightness test, voltage 24 hours are not permeable not leak is qualified.
(Iv) the system components and shower installation
1. water meter installation: flow indicator and rear should maintain a 5 times the installation diameter length of straight pipe, installation should be installed in horizontal legislation, note the flow direction and the direction of the arrow direction consistent flow indicator after installation, the diaphragm slurry should be movements are flexible and should not be occurring with rub pipe wall.
2. alarm valve parts installation: alarm valve fittings generally include pressure gauge, pressure switches, delay, filter, water alarm, drain piping, etc. Hydraulic alarm should be installed in a public channel or the walls near the signal and should test the installation and repair of the valve. Hydraulic alarm and alarm valve connection should use galvanized pipe, when nominal diameter 15mm, length should not be greater than 6m; when the diameter to 20mm, its length should not be greater than 20rn. Installation of hydraulic pressure alarm starts should not be less than 0.5MPa.
3. shower installation: spray head mounted in the ceiling in General after the installation, the installation of special wrench when required. Installation in vulnerable to mechanical damage of the nozzle should install shield.
4. the throttling device installation: throttling device should be installed in the nominal diameter of not less than the level segment on 50mm; pressure orifice plate should be installed inPipe flow turning on downstream side of a straight tube, and the distance with corner should not be less than the pipe nominal diameter of 2 times.
In the construction process several problems. 1. the professional coordination process must be installed to prevent the demolition of the spray tube again. 2. the pressure test to CAP because it has not been caused water leakage after. 3. Since the end of the tube elbow of open card fixed, branch pipe size, make contact with the spraying head and suspended ceiling is not strong, protective mouth tray is not positive. 4. do not pull line installation-the spray head not rows and rows. 5. flow indicator installed in the opposite direction: welding points with oxides resulting bad or flow indicator pulp slice does not match with the diameter of the work is not sensitive.
III. Summary
Automatic sprinkler system in the construction process, the key is to know and master the main pipe, pipes, high water tanks, alarm valve, spraying head tube, system components and spray top these major parts of the installation. This summary reference construction specification outlines the automatic sprinkler system main parts of some of the specific practices and construction of some of the issues, it is not only consistent with construction specifications, and to consider the second renovation and construction of appearance, you can reach the normal use of the spray system, avoiding the construction of the second rework. However, due to the construction of the limitations and lack of experience in the construction, there are some details also is not very complete, I hope you will lead the comments.