1 scope
This technology is applicable to industrial
and civil construction, ventilation and air conditioning systems, made of sheet
steel, stainless steel, aluminum composite plate, PVC duct, and component
installation.
2 construction preparation
Requirements 2.1 materials and equipment:
2.1.1 installation products should have a
factory certificate or qualification documents and product list.
2.1.2 wind pipe finished no deformation,
distortion, cracks, holes, flanges falls off. Leakage leakage flange welding,
riveting, eye bolts and other defects.
2.1.3 install the valve, muffler, covers,
inlet and other components should check that the regulator is flexible, noise
control, paint for any damage.
2.1.4 installation using materials: bolts,
nuts, washers, bedding, self tapping screws, rivets, rivets, welding
electrodes, welding electrodes, welding wire, stainless steel wire, asbestos
cloth, canvas, bolts, etc, should be in accordance with product quality
requirements.
2.1.5 hammer, hammer, hand drills, hand
saws, electric two-blade shears, electric wheel saws, angular wheel saws,
drill, electric welding tools, wrenches, screwdriver, hammer, wood clappers,
hand cut, chain, high stools, pulley ropes, sharp red, cold chisel, nail guns,
brushes, safety helmets, safety belts, etc.
2.2 operating conditions:
2.2.1 General supply and exhaust air
systems and air conditioning systems installation, to finish building envelope
construction, mounting area cleared of obstructions and ground clutter-free
condition.
2.2.2 the air clean system installation
should be installed inside the building parts of the ground, wall plastering is
complete, the room is not dusty or dust control measures carried out under the
conditions.
Dedusting system for 2.2.3 General duct
installation, appropriate plant or process equipment installed equipment base
have determined that device of the connecting pipe, Cap position known case.
2.2.4 checking the scene structures
reserved the position and size of the holes are as per drawing requirements,
without omission, reserved holes should be greater than the effective sections
on each side of the duct size 100mm.
2.2.5 operational sites to have the
corresponding auxiliary facilities, such as ladders, racks, and power supplies
and safety equipment, fire fighting equipment and so on.
2.2.6 duct installation design drawings and
detail drawings, construction technology, quality, safety and disclosure.
3 operational processes
3.1 process:
→ Determining elevation making hanger hanging → settings → install
hanger
Preflight → wind pipe flange
connection (dunnage put screws) →
Duct arrangement →
Jointless (hoop-cutting)
Testing installation leveling is → → → evaluation
3.2 determine the elevation:
According to drawings and reference
construction datum to identify wind pipe elevation.
3.3 production hanger:
3.3.1 elevations determined, in accordance
with the spatial location of the duct system to determine duct, hangers form
(Figure 4-10).
3.3.2 wind pipe, hanger production shall be
prepared in accordance with the standards Office of North China material
specifications and practices production.
3.3.3 wind pipe, hangers production
problems that should be noticed:
3.3.3.1 bracket cantilever, hanger hanging
rail is made of angle or channel; bracing materials for angle iron hanger bar;
the flat iron to make the hoop.
3.3.3.2, cradles in the making, first to
correct the steel, gagging and thermal correction correction method in two
ways. Small steel generally gagging. Large steel heated to 900 degrees Celsius
heat after correction. Correct order should first correction after correction
of distortions, bent.
3.3.3.3 steel cutting and drilling, you
should not use oxygen-acetylene cutting. Hoop circle should be consistent with
the duct arc. Weld supports must be full, ensure adequate load carrying
capacity.
3.3.3.4 Suspender bar should be based on
proper duct installation elevation interception. Wire should not be too long,
thread end should not exceed the tray bottom. Hooks should be simmered into
4-11 form.
3.3.3.5 duct force, hanger completed,
descaling should be carried out, brush the paint again.
3.3.3.6 for stainless steel, aluminum air
duct bracket clamp should be dealt with according to the design requirements of
anticorrosion insulation to prevent electrochemical corrosion.
3.4 set points set according to hanger,
embedded parts, method, method of expansion bolt and nail guns.
3.4.1 method of embedded parts:
3.4.1.1 early embed: embedded parts
according to drawings by reserve personnel coordinate and support and hanger
spacing, firmly fixed on the civil engineering structures reinforced.
3.4.1.2 later embedded:
A buried in the brick wall bracket:
elevation calculated according to duct bracket on the steel surface distance
from the ground, to find the correct installation location, hit 80mmx80mm
square hole. Hole size should be the same both inside and outside, buried
deeper than the stent wall depth 30~30 m m. After playing holes, hole in the
wall with water wet and rushed out of the hole in the brick chips. Part and
then filling in the hole in the wall 1:2 cement mortar, embedded support,
embedded depth of General 150~200mm. Level leveling bracket, adjust the
embedding depth, continue filling mortar to fill some water-soaked stones and
broken bricks for easy fixation. Filled in with cement mortar should be
slightly below the wall, to building trades for wall decoration.
B under the floor embedded hanging pieces:
determine where elevators use impact drill a through hole in the floor, and
then pick a 300mm long, deep-20mm slots (Figure 4-12). Hanging pieces embedded
in a trough, trough filled with cement mortar.
3.4.2 method of expansion bolt:
characterized by a flexible construction, accurate and rapid (Figure 4-13).
3.4.3 nail gun: for around 800mm duct hose
installation. Its characteristics with expansion bolts, should pay special
attention to safety when used (Figure 4-14).
3.5 install hangers:
3.5.1 duct center line find out Derrick
laying position, hanging on a pole in the center line of duct; double hanging
rods can tray the screw hole spacing or duct centerline symmetric installation.
3.5.2 boom under the hanging form can be
welded on the hanging can also be hung on the hanging pieces. After welding
should be coated with antirust paint.
3.5.3 riser cards installation, you should
fix a pipe at the top of, and then hammers hanging at the Center with a line,
line fixed pipe below.
3.5.4 duct is longer, you need to install a
row of bracket, start well at both ends, and then to the ends of the bracket as
the base, using the pull method to identify intermediate support level for
installation.
3.5.5 hangers hangers should be straight,
screw the complete. Suspenders need to splice can be threaded or welded. Should
be longer than the diameter of the hangers connecting thread 3 times, welding
should use lap, lap length should be greater than 8 times times the diameter of
the hangers, and welded on both sides.
3.5.6, hanger installation should pay
attention to the problem:
3.5.6.1 wind pipe installation, piping is
long, should be in place additional hangers to prevent swinging.
3.5.6.2, cradles of elevation must be
correct, such as circular duct diameters from large to small, to ensure the air
duct center line horizontal, scaffold on steel surface elevation should be
increased accordingly. For slope requirements of wind, the elevation bracket
should be installed in the duct slopes require.
3.5.6.3 wind pipe support and hanger
spacing, such as when there is no design requirements that are not insulated
duct shall conform to the requirements in table 4-20. For duct insulation, no
design requirements, and hanger spacing table spacing requirements when
multiplied by 0.85. Spiral duct, and hanger spacing can be appropriately
increased.
Support and hanger spacing table 4-20
Circular duct diameter or rectangular duct
length vertical duct horizontal duct size spacing spacing between edges minimum
number of hangers
Not more than 400mm less than 4m 4m 2
Not more than 1000mm less than 3M 3.5M 2
Not more than >1000mm less than 2m 2m 2
3.5.6.4, cradles of embedded or expansion
bolts buried part shall not be painted, oil-and should be removed.
3.5.6.5, hangers shall not be installed in
the outlet, valves, manholes, interferes with the operation. Hanger hanging
directly from the flange.
3.5.6.6 duct insulation, the lifting device
should be placed outside of the insulation, but not damage to insulation.
3.5.6.7 duct insulation cannot be direct
contact with the branch, hanging brackets, pad of solid insulation, the same
thickness as the insulation, to prevent the generation of "cold
bridges".
3.6 arranged duct flange connection:
3.6.1 to guarantee the tightness of flanged
interface flange between the Dunnage. No special requirements in case flange
gasket materials selection according to table 4-21.
Problems in 3.6.2 gasket flange gasket
material:
3.6.2.1 understanding all kinds of bedding
materials use, avoid using dunnage.
3.6.2.2 wipe off the flange surface of
foreign bodies and water.
3.6.2.3 not crowded or protruding into
inner flange gasket material, otherwise it will increase flow resistance,
increasing inner dust.
3.6.2.4 clean air systems do not use powder
materials such as asbestos rope. Flange gasket material joint should be
minimized, joint trapezoidal or Tenon connection, as shown in Figure 4-15. And
glue stick. Flange pressure down padding width, should make even with the air
duct wall.
3.6.2.5 flange rear flange slot filled
bedding is strictly prohibited.
3.6.3 bedding 8501 sealing tape usage:
3.6.3.1 wind pipe flange surface of foreign
bodies and water to clean it off.
3.6.3.2 from flange corner adhesive tape,
tape head should be slightly longer Yu Falan (Figure 4-16).
3.6.3.3 evenly along the flange and smooth
paste and paste by hand in the course of its real, not deciduous, interface closely,
all parts are not protruding into the air duct (Figure 4-17).
3.6.3.4 paste along flange and end a week
later cross-lap, cut off the excess (Figure 4-18).
3.6.3.5 stripped isolation paper.
3.6.4 flange connection, bedding in
accordance with design requirements, first two flanges, put on a few bolts, and
nuts, not to tighten. And then washed with sharp tucked into fit into the bolt
holes in the skid is two screw holes until after all bolts are put on and
tighten the bolts. In order to avoid the bolt slide fastener, bolts should be
based on a cross and gradually tighten evenly. Connect the air hose, flanges at
both ends shall prevail, whether the cable check the duct connections straight.
3.6.5 problems in flange connection:
3.6.5.1 flange if damaged (welding,
deformation, etc) should be replaced, repaired.
3.6.5.2 connection flange nuts should be on
the same side.
3.6.5.3 stainless steel air pipe flange
connections bolts should be treated with the same material made of stainless
steel, such as ordinary carbon steel, spray paint according to design
requirements.
3.6.5.4 should use galvanized aluminum wind
pipe flange connection bolts and washers for flange cushion galvanized on both
sides.
3.7 wind arrangement without flange
connection:
3.7.1-clamp connection: mainly used for
round duct plate and spiral duct connection, rolling drums at both ends of each
pipe reinforcement, reduced to one end and make it smaller. According to the
direction of flow when installing insert small SWIG and outside by a steel hoop
Drum hoops hold the connection of the two pipe ends, finally put a bolt through
fixing in the earrings screw (Figure 4-19).
3.7.2 plug-type connections: mainly used
for rectangular or circular duct connection. Before making the connection pipe,
and then insert the duct on both sides, then use the self tapping screws or
rivets to be tightly fixed (Figure 4-20).
3.7.3 cuttings-connection: mainly used for
rectangular duct connections. Different forms of cutting insert both ends of
the duct and then compacted. Its shape and takes over as shown in Figure 4-21.
Figure 4-21
3.7.4-hose connections: mainly used in the
wind pipe and components (such as a diffuser, side air outlet static pressure)
is connected. Installation, both ends of the hose connection tube, and then
with a special soft-gripping the hose.
3.8 duct installation: according to the
construction site, and can be ground into a certain length, then hoisting
method in place; you can also wind section of the tube section and placed in
the bracket connection section by section. General installation order is to dry
the tube after tube. Specific installation reference tables 4-22 and 4-23.
Horizontal installation table 4-22
(Single layer) plant, an auditorium, a
theater (multiple) plant, construction
Building
Duct height
Elevation of 3.5M duct
≤3.5m
Main air pipe
Installation tools
Air duct
Installation overall hoisting machinery
Elevators, chain
Section installation
Lift, bar stool section lifting
Lifts, scaffolds
Section installation
Lift, integral lifting of scaffold
Elevators, chain
Section installation
Lift, bar stool section lifting
Lift, bar stool
Section installation
Lift, bar stool
Vertical duct installation table 4-23
Interior elevation 3.5M duct height duct
>3.5M
Section lifting pulley, hoisting pulleys,
for the high stool-scaffolding
An outdoor section section lifting pulley
of lifting pulley, scaffold, scaffolding
Note: the vertical duct installation varies
from the bottom up.
3.9 wind tube extension installation: the
duct is connected on the ground, generally grow to about 10~20m, chain or
pulley method on the duct rose to hanger. Duct installation steps:
3.9.1 first according to the site, select
two points on the beam, and then hanging chain or pulley.
3.9.2 the use of twine to bundle wind
strong. Rope knot as shown in Figure 4-22. Plastic air duct as required when
hoisting, rope may not be directly tied to the wind pipe, apply a long holding
the bottom of the duct Board, surrounded by soft material cushion, before
lifting.
3.9.3 when lifting, when 200~300mm when the
wind pipes from the ground, stop the lift, check chain pulley rope points and
bundled air duct, rope, and air duct's Center of gravity is correct. After only
a few questions, and then proceed to lift.
3.9.4 duct behind the branches, hangers,
all pallets and Derrick to be connected, confirm duct sound good, you can untie
the knot.
Section 3.10 wind pipe installation:
hanging pulley or with reduced mobility due to space restrictions, hoisting is
not possible, air duct sections can be pulled that rope on the scaffold, and
LAN installation section by section to the brackets on the Fa-rectification.
3.11 duct installation should pay attention
to security issues: 3.11.1 lifting, prohibited personnel hung below the duct,
duct non-stop people.
3.11.2 should check on the wind pipe, no
weight on the surface to prevent lifting, falling objects hurt.
3.11.3 long wind pipe, lifting speed should
be conducted in parallel, both echo to prevent a too high, Middle wind force
caused by the large flange pipe deformation.
3.11.4 into the duct bracket should be
installed in a timely manner, you can't place too long.
3.11.5 opened holes do not for the time
being not to install in advance; to suspend construction, should be stamped
plate, to prevent people from falling accidents.
3.11.6 using ladders shall not be short of
blocking may not be padded. Use to fasten at the top of the ladder, slide-proof
measures at the lower end.
3.11.7 air pipe and duct pipe connections,
intubation interfaces should be guiding device.
3.12 installation:
3.12.1 wind tube adjustment device shall be
mounted on the easy part.
3.12.2 fire damper installation location
should be on the right path, easy to melt flow direction. Manual installation
of the exhaust valve (embedded catheter) may exhibit dead bent and flat tube.
3.12.3 fan pressure, the check valve should
be installed side opening direction must be consistent with the direction of
flow.
3.12.4 VAV terminal device is installed,
providing independent support and hanger, with a duct should be done before
testing.
3.12.5 all kinds of vent hood installation
should be in place for the device. Hood drip tray or duct installation must be
firm, not leaking. Condensate drainage to the specified location.
3.12 6 manual sealed valve install valve
signs on the direction of the arrow and the shock waves in the same direction.
4 quality criteria
4.1 project:
4.l.1 installation must be firm, location,
elevation, and to comply with the design requirements and part correct, easy to
operate. Fire valve check the hole location must be located in the operational
area.
Inspection method: Visual check.
4.1.2, hanger, bracket forms,
specifications, location, spacing and fixing construction must comply with the
design requirements and norms, located in the outlet valve and the viewing
window is strictly prohibited. Stainless steel, aluminum duct with corrosion
the steel bracket must be insulated and isolated.
Inspection method: observation, foot and
hand inspections.
4.1.3 aluminum duct flange connecting bolts
must be galvanized and mat galvanized around the flange gasket.
Inspection method: Visual check.
4.1.4 oblique flapper valve when mounted
vertically, valve plate must shanglaqi; when installed horizontally, parallel
to the air flow direction of the valve insert, valve plate should not pull down
on restart.
Inspection method: Visual check.
4.1.5 hood installation must be firm, air
duct junction with roof leaks is strictly prohibited.
Inspection method: observation and water
checks.
4.1.6 clean system air hose connections
must be tight and no leakage; flange gasket materials and fittings must comply
with the design requirements and construction specifications.
Inspection method: Visual check.
4.1.7 clean system Flex pipe material and
must not produce dust, airtight, smooth inner wall; Flex pipe and duct,
equipment connections must be tight and no leakage.
Inspection method: lighting and Visual
check.
4.1.8 clean system duct static pressure box
installed in the wall must be clean, free from dust, grease, rust and other
debris.
Inspection method: white silk cloth or
Visual check.
4.2 Basic project:
4.2.1 transport produces condensate or
containing humid air duct installation slopes meet the design requirements, the
seams are sealed at the bottom. The joint surfaces smooth, beautiful.
Inspection method: standard and Visual
check.
4.2.2 wind pipe flange parallel to the
dock, strict, bolt. Exposed length of bolts suitable for consistent, flange nut
on the same side of the same pipe.
Inspection method: wrench loosen the swab
and observe the examination.
4.2.3 outlet mounting position is correct,
exposed parts of the flat appearance, elevation within the same room, neat.
Inspection method: observation and standard
checks.
4.2.4 elastic fit Flex tube length comply
with design requirements and specifications provided, free of cracks and
distortion.
Inspection method: standard and Visual
check.
4.2.5 cover installation location is
correct, neat, solid and reliable.
Test Optional: standard and Visual check.
4.3 allowable deviation:
Allowable deviation is shown in table 4-24.
Wind pipe, outlet installation method for
the determination of tolerances and table 4-24
Project tolerance (mm) test method
1 level 3 per metre
Total 20 cable, fluid connectors and
standard deviation check
Exposed duct 2 per metre
2
Total deviation of 20 vertical hanging and
foot check
3 individual outlet level 3 ‰ cable, fluid
connectors and check
2 ‰ vertical hanging and foot check
Note: the concealed duct should be correct,
no obvious bias.
5 finished product protection
5.1 Installing the duct to keep duct
surface is smooth and clean, outdoor air duct snow-rain-proof measures.
5.2 suspension system for the construction
of air duct, duct openings should be closed to prevent debris from entering.
5.3 when duct duct into the structure, its
end should be installed steel nets to prevent when the system is running, and
metal debris into the air duct.
5.4 cross site with more jobs, forbidden to
install the duct support, hanger, bracket, is not allowed to have other,
hangers welded on or hanging in the wind pipe flange and duct, hangers on.
5.5 transport and installation of stainless
steel, aluminum air pipe, you should avoid scratching the surface.
Installation, minimizing contact with the iron.
5.6 transport and when the valve is
installed, should avoid executive body and blade deformation due to collisions.
Air storage rain and snow measures.
6 quality problems to be noticed
6.1 duct parts quality problems should be
noticed during the installation as shown in table 4-25.
Duct installation should pay attention to
quality issues with the part table 4-25
Ordinals often quality control measures
1, hangers don't brush oil, long boom
enhanced responsibility, up time after brushing oil boom should be carefully
checked by the interception of elevation
2, and hanger spacing is too large to
implement norms, after installation, carefully review whether there is too much
space
, Waist band 3 flange welding before
installation check, identify problems, and repaired in a timely manner
4 screws wear leakage, not tight, loosen to
increase responsibility and flange hole spacing should adjust
5 Canvas is too long, twisted riveted
canvas should be straightened, and the strap to tighten the canvas, not leaking
rivet
6 modify pipe, rivet holes are not blocked
or solder sealant modified application blocking
7 padding off strictly according to the
process to do, flange surfaces should be clean and
8 clean bedding does not apply sealant to
seriously study specifications
Inflexible 9 fire valve valve valve body
not scratches check actuator with fusible
10 outlet flexible blade should be
parallel, not solid and not with the bounding box scoop
11 outlet install not demanding
implementation of specifications on outlet installation requirements
7 quality records
7.1 wind pipe and parts installation
engineering quality inspection and evaluation form.
7.2 inspection projects and inspection record
form.
7.3 hidden project inspection records.
7.4 mutual inspection records.
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