1 scope
This technology is applicable for
industrial and civil construction, ventilation, air conditioning system and air
cleaning systems, industrial plants in general air duct insulation, ventilation
system works.
2 construction preparation
Requirements 2.1 materials and equipment:
2.1.1 the thermal insulation material used
to have a factory certificate and with the relevant authorities of
certification and related legal proof of the detection unit.
2.1.2 use of insulating material shall conform
to the design parameters of air-conditioning requirements and fire code
requirements, as follows:
L. design parameters: coefficient of
thermal conductivity for 0.022~0.047W/m · K, (glass wool or felt)
Thermal conductivity for 0.042~0.064W/m · K
(rock wool or felt)
2. flammability: non-combustible or flame
retardant.
2.1.3 there are generally two types of
commonly used insulation materials:
1. fiber-like: rock wool, aluminium foil
rock wool Board, Superfine glass wool blanket, aluminum foil glass wool board.
2. porous: self-extinguishing polystyrene
foam, mineral wool, polyurethane foam insulation.
2.1.4 insulation subsidiary materials:
glass fiber cloth, fire retardant paint, adhesive, metal, heat preservation
nails, should comply with the design requirements and related regulations.
2.1.5 circular saws or slab saws, hand
saws, holding the knife, steel ruler, package box feet, hair brush, pliers,
etc.
2.2 operating conditions:
2.2.1 field civil engineering structures
have been completed, without massive construction of water occurs.
2.2.2 wind pipe, part installation quality
meets quality standards, antiseptic parts needed for a good paint job.
2.2.3 insulation works or outdoor
construction freeze in winter and rain protection measures.
2.2.4 wind pipe, components and equipment
insulation engineering construction in duct system leakage test and inspection
after qualifying.
3 operational processes
3.1 process:
Adhesive insulation internal insulation → test
Hidden check picking → → → → Pu covered with
plastic insulation material polystyrene Board insulation
Insulation material unloading rock cotton
insulation
→
→ → Wrapped
fiber glass fabric brush fire retardant coating → outdoor insulation
plus metal shell testing
3.2 insulation material to be exact, cut
face to flush cutting to make horizontal, vertical, patched on short big top at
the ends (Figure 4-23).
3.3 bonding thermal insulation duct walls
before nailing on the dust, wipe oil, apply adhesive respectively in the pipe
wall and insulation bonding surface of the nail, glue it again at a later time.
3.4 rectangular air pipe and equipment
insulation nail density should be uniformly distributed, bottom surface of not
less than 16 per square metre, laterally not less than 10, the top surface of
not less than 6. Insulation nail glue should be 12~24h after after then covered
with insulation material.
3.5 insulation materials cover longitudinal
and transverse joints should be staggered (Figure 4-24).
Small pieces of insulation material should
be paved covered in horizontal plane.
Rock wool insulation between each take the
figure 4-25 approach head.
3.6 types of insulation material practices:
3.6.1 internal insulation. Cotton
insulation materials such as rocks, and post-should apply on the flange
insulation material section fixing glue, prevent fibers from being blown up.
Rock wool should be coated with a coating on the inner surface.
3.6.2 polystyrene Board insulation. Once
polystyrene banpu, put iron short angle in the corners, and then with a thin
steel band for hoop, packing clamp clamp. Steel clamps every 500mm together
(Figure 4-26).
3.6.3 rock cotton insulation. Exposed pipe
insulation should be added at the corner bar iron bag corner, wrapped with
glass cloth.
3.7 wrapped glass fiber cloth. Twists make
it overlap each other, so that the insulation material appearance form two
layers of glass cloth winding
(Figure 4-27).
Glass fiber cloth head to clamp firmly or
glue stick.
3.8 glass fiber cloth brush two
fire-retardant coating on the outer surface, coating should be tight uniform.
3.9 outdoor Lomond duct insulation should
also be coupled with a layer of metal shell, shell at the overlap between the
rivet fixed seam sealed with PuTTY.
4 quality criteria
4.1 project:
4.1.1 the insulation materials,
specifications and fire resistance design and fire protection requirements must
be met. Electric heaters and 800mm range of duct insulation with non-burning
materials. To examine certificates of material or combustion.
Inspection method: observation of check and
check the material certificate or a test.
4.1.2 air ducts and air conditioning
equipment, as well as condensate parts produced, must be well insulated, tight
and seamless.
Inspection method: Visual check.
4.2 Basic project:
4.2.1 the use of bonding materials of
insulation shall comply with the following requirements:
Paste a solid, filled full, dense seam
adhesive materials, seams even tidy, neat, vertical joints staggered.
Inspection method: observation and hand
check.
4.2. the 2-volume, bulk insulation material
should be close to surface, solid bandage, elastic moderation, bulk material
not exposed, the surface smooth.
Inspection method: Visual check.
4.2.3 glass fiber cloth, plastic protective
layer elastic moderate, lap width of uniform, smooth appearance.
Inspection method: Visual check.
4.2.4 thin sheet metal cover should be set
Parallel to the flow direction, width, and interfaces, and fixation, lap width
of uniform appearance.
Inspection method: observation and standard
checks.
After 4.2.5 insulation valve, open and
close tags to clear, clear, beautiful, easy to operate.
Inspection method: Visual check.
4.3 allowable deviation:
Evenness of insulation, insulation
thickness tolerances and inspection methods are given in table 4-26.
Flatness, thickness of insulation for
thermal insulation layer method for the determination of tolerances and table
4-26
Project tolerance (mm) test method
Insulation surface flatness of coil or
plate 5 1M ruler and the wedge-shaped feeler Gage check
Bulk material or soft materials 10
+0.10δ
-0.05 δ steel needles into the insulating
layer and the standard checks
Note: δ for the thickness of insulation
layer.
5 finished product protection
5.1 thermal insulation material stacked on
site must have waterproofing measures, as far as possible be kept in warehouses
or in aerial and ground covered with a waterproof material.
5.2 galvanized iron wire, glass fibre
cloth, insulation nails and insulation adhesive material should be kept in a
warehouse in the custody.
5.3 insulation material should be fair use,
try to save material, call it is not exhausted when material should be brought
back to custody or piled up without affecting the construction place, against
loss and damage.
6 quality problems to be noticed
6.1 thermal insulation quality problems
should be paid attention to in the process are shown in table 4-27.
Insulation quality problems should be paid
attention to in the process table 4-27
Serial number control measures for common
quality problems
1 insulation nail adhesive is not strong,
resulting in heat preservation material shedding strictly according to
technological requirements, operation, avoid the bump
2
Insulation insulation material appearance
beauty crop to be exact, corner to add iron leather corner, glass cloth winding
tension should be appropriate
3 glass of silk loosely woven glass fabric
head to jail or glued
4 system insulation missing cover valve
parts and connected with the end device parts are rigid insulation
7 quality records
7.1 project impression quality assessment
form.
7.2 wind pipe and equipment insulation
engineering quality inspection and evaluation form.
7.3 intermediate inspection records.
7.4 cover engineering and inspection
record.
7.5 out of checking and cross-checking
records.
7.6 Division engineering acceptance record.