【 Weak current College 】 automatic sprinkler systems, fire hydrant system construction technology

1. automatic sprinkler systems, fire hydrant system description

A. nozzle set

Underground car park and no ceiling are made of vertical glass ball nozzle, where width is greater than 1200mm of duct, the nozzle in the duct installation adopts hanging sprinkler.

B. network

Pipe with hot-dip galvanizing of steel pipe, pipe diameter less than or equal to 50mm with threaded connection.

When the diameter is greater than when you use Groove connection 50mm.
C. system components

Each layer or separate fire partitions located preaction valve and flow meter, water flow meter front-end set signal valve, alarm valve group before and after use signal valve, installed at the direction of flow.

2. reservations, embedded stage construction

A. fire reserved, embedded phase of construction, according to design drawings and in close collaboration with the civil construction.

B. reserved, embedded to check the good location, size, and elevation. Well casing and fixed, and when setting the specialist OMV ash to avoid displacement, ensure accurate and should do a post, preflighting, implicit check records, the supervision of qualified acceptance before entering the next procedure.

C. equipment basis according to the construction schedule and civil construction, and do all the installation of the pipeline equipment.

3. automatic sprinkler systems, fire hydrant system construction process

A. construction process

According to construction drawings and engineering features, reasonable arrangements for the construction process. Pipe fittings and brackets precast-pipe threads processing-pipe bracket installation-dry pipe installation-branch installation-pipeline pressure-washing-sprinkler pipe and equipment installation-system debugging-system acceptance

B. construction preparation

Familiar with drawings and controlled on-site review pipelines, equipment, location, elevation is a crossover or arrange improperly, timely and designers of settlement, negotiation procedures. Check the embedded or reservation is correct, you should temporarily tick chisel and design consultation.

C. tube processing
1) materials, equipment must be reported to the supervisory approach inspection before use.
2) trunk sectional construction, construction of bottom-up order.
3) pipes adopt various layer pipes set prefabricated, on-site installation of construction method.

D. grooved pipe fittings processing requirements (special procedure)

This project of automatic water sprinkler system, as designed is greater than DN50 pipeline adopts the grooved mechanical pipe connections, its concrete construction methods are as follows:

1) check the roller Groove machine and down scroll wheel and spacing, adjusting nut scale must be the desired processing pipe dimensions, then power on switch on the machine running properly.

2) check the end of the section steel tube and pipe axis must be vertical, no crack, no Flash, so as to ensure that the pipeline trench qualified after processing.

Insert the pipe 3) under the wheel, attention must be in place to maintain parallel, such as steel pipe is too long, should be another shelf bracket.

4) hydraulic pump with a non-nut clockwise to tighten, action hydraulic handle to the scroll wheel down pipe, open foot treading on the switch, the joystick to uniform pressure down, in particular on the importance of galvanized pipe, is down on the wheel, has been run to slot machine until the upper spacing nut in place, at this point, there should be considerable resistance to the joystick, then let the machine in one to two weeks of rotation, in close switch, release the hydraulic pump pressure relief on nut, automatically rise on the wheel.

5) with a tape measure or Vernier caliper check pressure trough the Groove dimensions after conforms to standards such as unqualified adjustable pressure slot machine the above limit, the adjustment nut, to increase the deep trench, the trench talking down to, and then in the processing until the dimensions with the request.

6) steel pipe machining groove after you start System Setup, the check is processed steel pipe end and want to install pipes operations should no cracks, no burrs protruding, indentation and to ensure the sealing effect. Tube end to Groove should be smooth, such as a loose paint, scrap iron, dirt, debris, oil and rust and other impurities must be removed.

E. pipeline trestle, cradles of installation

1) pipeline trestle, cradles of installation location should not interfere with the effect of spray nozzles, and the distance between the nozzle should not be less than the end of the nozzle 300mm, and should not be greater than 750mm distance. Water distribution pipes every 15 meters and a diameter greater than 50mm pipe bend a baffled bracket. Water distribution pipes on each pipe segment between adjacent nozzle segment are not set hanger is less than 1, when the distance between the nozzle is less than you can at paragraphs 1.8m set, but should not be greater than the spacing between the hanger 3m. Each water distribution pipes yishe a baffled bracket.

2) sprinkler system piping hangers selection and practices should meet the requirements of construction Atlas, hangers maximum spacing to satisfy the following requirements.

3) riser concealed in shafts, well within the embedded iron installed card fixed, installed in the distance from the ground or floor should 1.5 ~ 1.8m.

4) level of card holder installed piping to hanger, generally every dry pipe should be set 1 baffled bracket. Pipeline changes direction, there should be baffled bracket.

5) grooved hangers installed

Pipe hangers installed; grooved pipe connection its clamp fitting has a certain amount of axial expansion and axial misalignment, and hangers to not only eliminate inappropriate stress in the pipe, joints and other parts, but also that it requires active pipeline is removable. To meet this requirement, and hangers should the maximum spacing between shall conform to the standards

F. network installation

1) pipe sprinkler system shall be based on design requirements, the use of galvanized steel tube and pipe fittings, pipe nominal diameter less than or equal to 50mm, thread connection should be used; when the pipe nominal diameter greater than 50mm, Groove clampFlexible fitting connection.

2) installed along the field equipment materials test: enter equipment material specifications, model should meet the design requirements: tidy, no defects, deformation and corrosion; galvanized or painted uniform non-shedding; flange seal should complete clean, no burrs and radial grooves; sikou intact injury; pump up car should be flexible and non-blocking and unusual sound; equipment fittings should be complete; alarm valve and valve leak test, carried out by the nozzle by a certain percentage of sampling inspection, its strength and tightness test results shall meet the requirements for acceptance. Inspection of materials should have the records management manual for i.d..

3) network installation before straightening internal pipe and clear debris, stop the installation if the installed pipe exports should be blocking. If you need on the galvanized pipe hole welding should advance precast piping ends, if necessary, adopt the flange welding live next, finish cleaning corrosion after install. Prohibited in the installed good galvanized pipe hole welding.

4) distribution after installation, piping without treading on the waist, Arch of wave phenomena and the snake bends left and distorted. Water distribution pipes, water distribution pipe should be red ring rings logo.

5) dry pipe installation: (special procedure)

Spray dry pipe clamp flexible tube connectors, each root piping length should not exceed 6m, straight some root can be connected together using round chain installation, 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 pipe. To be stable and lift one end.

Pipeline connection clamp flexible fitting, first check the pipe end; from the tube end into the notch must not rugged or roller marks in its external surface in order to ensure sealing is not revealed. Check the seal ring and lubrication; seal ring flanges and the outer coating of a thin layer of lubricant fluid or liquid soap. Then install sealing ring; ring set in pipe pipe end to ensure that the sealing ring flange is not stretched out in the fitting. Connect both ends of the pipe; the two steel tube or pipe fittings are placed in a straight line, at both ends of the pipe, put together, so that the sealing ring sliding into two pipe Groove position, making it cross-pressure at two connection pipe end, seal cannot cover or get in the Groove, nor into the notches on the other end. Finally, the imposing hoop clamp on the seal, make sure that the clip is embedded in grooves. Insert bolts and nuts, tools on uniform tighten the nuts on both sides until the clip between right next to each other.

6) level network installation quality standards for: pipe slope requirements: 0.002 ~ 0.005 slope and slope drainage direction.

Pipe tapping requirements, DN32mm pipe tapping twice, DN40-50mm pipe tapping three times, tapping the pipe DN70-80mm three to four times, DN100mm pipe threader five times, pipe thread Machining accuracy should be consistent with the relevant provisions in national standards, require wuduan wire, galvanized layer is damaged, thread clean, structured, Assembly after pipe thread has 2-3 for exposed and corrosion-resistant good, no flaws exposed Yau Ma, securely. Thread connections sealing packing should be uniform in pipe thread position, tighten pipe shall seal materials into the pipe, connected external processing clean.

7) flange connection pipe, flange connection in parallel, tight, and the vertical centerline of the pipes, gasket material well, the same side of the flange nut, screw length match the length of the exposed nut.

8) pipeline through wall for casing, casing is generally lower than two pipe diameter, tube sleeve gap filling sealing paste or bituminous linen wire, pipe casing and no connector. Network outage in installation, pipe mouth closed.

9) branch pipe installation, pipe branch reserved port before the erection of precast. Adopt the position reserved tee. All reserved port are good temporary plugging plate. When the pipe reducer, reducing joints should be adopted. Pipe elbow Department shall adopt bushing. When you need to fill the heart, the tee 1, available on the four way, should not exceed 2.

10) sprinkler head branch pipe installation:

Connect spray head a section at the end of the pipe, the pipe cannot be completed at the same time dry pipe branch, to synchronize with the ceiling decoration. Ceiling joist ceiling mounted, depending on material thickness for spraying head elevation, of the reserved ports by 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 25mm/15mm reducers Hoop, 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.

The spraying head up spraying conditions can be installed with the pipes. Other pipeline after installation position is not easy to operate also should install the sprinkler head up spray.

G. spray system pressure test

1) valves and nozzle test: installing forward field of all kinds of valves and wet alarm valve nozzle pressure testing should be individually, according to the rules, the quantity of the sampling pressure test, 5 minutes, no pressure, no leakage, no deformation of the rink.

2) system pressure test:

In order not to affect the progress of the ceiling decoration can be layered, segmentation, and ceiling before system pressure test. Pressure test pressure testing, should be prepared before flushing programmes, will network with layered, segmentation, pressure test procedures, pressure data, measures to prevent accidents and other issues for detailed low-down, and approved by management. Pressure test of the entire process of contracting party invitation and supervisor to participate. Test before, a comprehensive inspection of pipes, valves, bracket meets the design and specification requirements. Water pressure test is inappropriate when the ambient temperature is below 5 ° c, water pressure strength test of the test points located in the lowest point of the pipe network system. On cannot participate in the testing of pressure gauges, valves and accessories should be removed. Additional temporary blind plate should be prominent in the flange edges ear and do clearly marked, and record the number of temporary blind plate. On the highest point of the water pipe network, the device you want to have the exhaust and air inside the pipe-line NET and slow test pressure boosting, reached the regulated 30 minutes, Visual networks should be free of leaks and deformation, and should not be greater than the pressure drop, if 0.05MPa clamp flexible fitting, valveDoor and leakage, pressure booster before fastening, then when you do a tag appearing leakage, pressure after it is processed. Necessary for drainage. Water pressure tightness test in water pressure strength test and pipeline flush after passing the test pressure shall be designed to work under pressure, voltage 24 hours, no leakage. This work in the network all laying on completion, before doing the hydraulic test shall be notified to the other construction unit, you should try to remove the fear of water objects, prevent water leakage damage and contaminated materials. Hydraulic test with ceiling, ceiling joist before installation, preferably on the ceiling is not to prevent leaks before complete damage ceiling. Water pressure test

Inspection shall be the civil party on water and drainage area for waste water discharges.

3) hydraulic test pressure shall be determined under the pressure of work. When the system working pressure equal to or less than 1.0MPa, test pressure using 1.4MPa; when the system working pressure greater than 1.0MPa, test pressure with pressure plus 0.4MPa. Pressure test, Visual when voltage 30min should no leaks and pipe deformation, and the pressure drop is not greater than 0.05MPa. Pressure test-

After InCharge acceptance procedures.

H. washing spray system

1) rinse water pressure strength should be in the pipeline, after pressure washing using tap water, rinse before checking a solid pipeline support. The order should wash washing dry, risers, and then wash with water and dry pipe. Pipeline flushing of sewer pipeline, and drainage systems and reliable connections, the emissions should be smooth and secure. Floor spray pipe flushing to signal the valve after DN32 valves for export, the risers to lowest slag valve for discharge. Network would not be appropriate for less than in flushing velocity 3m/s, the flow direction and the direction of flow pipeline, pipe with a hammer gently beat, especially the welding Department, until the effluent water color and transparency in line with the intake Department. Fill in the sprinkler system piping network flush records table ", signed by the Commissioner. Flushing water should not be less than the table:

2) when the site does not meet the water flow and drainage conditions, should be considered in conjunction with the situation and supervision, design consultation.

I. sprinkler installation:

Sprinkler installation in system pressure test, after washing, shower competency in the ceiling mounted after the installation, installed in the vulnerable to mechanical damage of the nozzle should install shield. Sprinkler threads packing PTFE tape should be used. When you use a dedicated sprinkler installation wrench, the framework is strictly prohibited nozzle tightening. Head frame, splash plate deformation or release the original injury, specifications, models the same head replaced. Nozzle should pull line installation, in rows, but you want to determine the coordinates of drawings, do keep the nozzle opening position accurate, and under the ceiling material thickness of the nozzle orifice, elevation and reserved for the branch pipe length. To avoid contact with the spraying head and suspended ceiling is not strong, protective mouth tray is not positive. The end of the tube elbow plus card thing fixed, and tube dimensions accurately. Post install splash plate and nozzles, Windows and entrance or wall distance within specification and design requirements.

J. equipment installation

1) alarm valve block the installation:

Alarm valve should have trademarks, models, specifications, and other flags and the flow direction of permanent markers, and a factory certification. The disc and operator flexibility, valve cleaning, not blocked. Alarm valve block the installation of water control valve should be installed, alarm valve, and then do the alarm valve auxiliary pipe connection, water control valve, alarm valve and water distribution, dry pipe connection should make the direction of flow, alarm valve block the installation location should meet design requirements, when design without requires time, alarm valves installed in easy-to-use obvious location, distance indoor floor height 1.2 m, distance from the wall on each side and not less than 0.5 m, distance from the wall on the front and not less than 1.2 m. Installation of alarm valve Group indoor surface should have drainage facilities.

2) pump combination is installed: fire pump combination for Assembly should by interface, bulk, connection tubes, check valve, safety valve, vent pipe, valve order. Water pump combination device specification should be located

Meter selected, its installation location should be clearly marked, valve position should be easy to operate, combining for undue obstacles in the vicinity. Press system working pressure of safety valve set pressure, combined with the device should be fitted with valves.

Walls of fire pump with filter installation should comply with the design requirements, design without requires, its height is appropriate, and the wall 1.1m of doors, Windows, holes, caves of net distance should not be less than 2.0m, and should not be installed below the glass curtain wall. Underground fire pump with filter should cast a "fire" flag of cast iron manhole cover, and in the vicinity of the flag indicating its position, at maximum water level above local underground fire pump with filter wells, its wall use Mu7.5-brick, masonry cement mortar M5.0 level. The intake and well cover the underside of the distance not greater than 0.4m, and should not be less than the radius of the manhole cover.

3) flow indicator is installed:

Water meter installation should flush the pipeline pressure test, after passing the flow indicator, specifications, models should meet the design requirements. General installation at each level of the branch on a dry pipe. Flow indicator and rear should maintain a 5 times the installation diameter length straight, vertical flow indicator should be installed in horizontal pipe on the side, not inclined to keep the water meter size tablet, patch-flexible swing, installation note direction of flow, its actions are consistent with the direction of flow direction.

4) alarm valve components installation: alarm valve Group generally include pressure gauge, pressure switches, delay, filter, water alarm, drain piping, etc. Should strictly follow the instructions for installation, or install Atlas. 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 20m. Installation of hydraulic pressure should not alarm starts .05mpa.
BR > 5) throttling device installation should be nominal diameter not less than the level segment on 50mm; pressure orifice plate should be installed in the duct 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.

6) fire pump suction pipe with flexible short-tube, water pump in place, to the center line alignment, horizontal alignment, elevation alignment. Tubing, piping and pump connection can not be forcibly combination suction pipe and outlet on the back elbow are located under the pier. Suction pipe installation should have along the fluent direction continuous upward slope next to the pump inlet, slope of not less than 0.5%.

7) signal valve should be installed in the pipeline before the flow indicator, and the distance between the water flow indicator should not be less than 300mm.

8) exhaust valve installation in system pressure pipeline, after flushing the qualified installed in the exhaust trunk mains water distribution, with the top end of the barrel, ensure that no leakage.

9) control valve specifications, model, and the installation location should meet the design requirements, in the right direction, control valve should be clean, no plug, no leakage; main control valve with hoist flags, shelter of the control valve in the clear is equipped with a flag indicating their location.

10) pressure switch should be vertical installation in piping to water alarm, and should not be changed during the installation of Assembly and disassembly.

11) fire hydrant box installation: fire box installation should comply with the design requirements, fire hydrant for fire protection design from the ground level for fire protection design for 1.1m, outlet direction should set the fire hydrant under or with vertical walls.

K. system debugging

1) system for debugging include: fire sprinkler pump debugging, fire hydrant pumps, regulators pumps debugging debugging, alarm valve commissioning, drainage device for debugging, linkage experiment. Sprinkler system installation completes the overall water. Enables the system to achieve normal working pressure for debugging.

2) through the terminal device on the water, when the pipeline pressure drops to the set value, the regulators pumps should start and stop on the water, when network pressure recovery to normal, regulators pumps should stop running. When the terminal device to 0.94 ~ 1.5L/s of traffic on the water, the pump should be self regulated. Flow indicators, pressure switch. Hydraulic alarm and fire pumps, etc. should be timely action and issued the corresponding signal.

3) fire hydrant installation is complete, the test should be carried out through the water. Fire hydrant water gun of the water column should not be less than the full 10m. Fire hydrant for fire protection design of static pressure should not be greater than, greater than 0.8MPa

0.8MPa, should take regional water supply system. Fire hydrant for fire protection design of the water pressure is greater than

0.5MPa, fire hydrant Office should be set and vacuum unit.