Cooling pipe insulation
1 scope
The technology standard is suitable for use in air conditioning refrigeration pipe heat preservation engineering in the system.
2 construction preparation
2.1 material and main equipments:
2.1.1 insulation materials should comply with the regulations of design and has a factory qualified certificate or test report.
2.1.2 insulation materials with polyurethane rigid foam plastic (soft) shell, hard (soft) polystyrene foam plastic shell, rock wool pipe shell, etc. The above material should be small coefficient of thermal conductivity, have a certain strength to withstand from the medial and lateral water wet or gas penetration, does not contain corrosive substances, non-combustible or won't burn, convenient for construction.
2.1.3 insulation material at the scene of the storage, transportation and storage process should not be affected by damp and mechanical damage.
2.1.4 hand electric drill, inadvertently, wire cloth scissors, pliers, screwdriver, putty knife, small oil brush, float, barrels, hook, etc.
2.2 operation conditions:
2.2.1 flame retardant material must be flame retardant performance verification, qualified rear can use.
2.2.2 pipe insulation construction must be in the system pressure test leak detection qualified, anticorrosive processing after the end.
2.2.3 site should be clean, good lighting. In winter and the rain period construction should be frost sleet prevention measures.
2.2.4 the steam-water pipes not liner should supplement the defect or packing. Instrument to take over the parts have been installed.
2.2.5 should be the builder of the technology, quality, safety disclosure in writing. Before the heat preservation should be hidden.
3 operation process
3.1 process:
Implicit check - generally according to the thermal barrier - moistureproof layer - > layer construction and inspection of order.
3.2 thermal barrier construction method
3.2.1 straight pipe riser should order from bottom to top, horizontal tube should from the side or bend the straight pipe in order.
3.2.2 rigid insulation blanket shell, can use 16 ~ 18, galvanized iron wire twin strapping, strapping spacing should not be greater than 400 mm, and bonding material closely paste on the pipeline. The gaps between the shell and should not be greater than 2 mm binding material jointing filled with circular seam should be staggered, stagger distance not less than 75 mm, tube and shell longitudinal seam should be located in the left and right side of the pipe axis, when thermal barrier is greater than 80 mm, the thermal barrier should be laid, two layer should be seam pressure between the layers.
3.2.3 semi-hard and soft, thermal insulation products of the thermal barrier can be used packaging steel strip, galvanized steel wire for 14 ~ 16th banding. The banding spacing, semi rigid insulation products should not be greater than 300 mm; For soft no greater than 200 mm.
3.2.4 strapping on each thermal insulation products, shall not be less than two.
3.2.5 shall not adopt spiral twisting enlacing.
3.2.6 elbow finalize the design of the bend tube shell should be used or processed into dried shrimp with straight pipe shell waist blocks, each bend shall be not less than 3 pieces, to ensure that the tube shell and tube wall together, beautiful and smooth.
3.2.7 equipment on the pipeline valve, flange and other removable parts insulation should be set aside bolt length plus 25 mm gap on both sides. For thermal insulation valve, flange parts should be separately (FIG. 4-39).
3.2.8 ZhuGanGuan assembly should do first, after the branch pipe. All through the building insulation around the casing pipe and the pipe heat preservation material filling close clearance application.
3.2.9 thermometer on the pipe socket should be higher than the design of insulation layer thickness. No thermal insulation pipe don't with thermal insulation pipe laying, heat preservation pipe should be to keep enough distance between buildings.
3.3 moistureproof layer construction method:
3.3.1 vertical tube should be bottom-up, horizontal tube from high to low order, ring to seam should be toward the low end.
3.3.2 rainfall distribution on 10-12 moistureproof layer should be closely paste on the insulation, sealing good, thickness uniform tension, no bubbles, wrinkles, cracks and other defects.
3.3.3 do moistureproof layer with coil, usable spiral winding way solid paste on the insulating layer, beginning should be around 2
After spiral wound again, lap width straight to 30 ~ 50 mm.
We made moistureproof layer, felt paper available lapped bandage, lap width of 50 ~ 60 mm. Linoleum interface should be down, and the asphalt emperor grease seal, each 300 mm galvanized a lead wire or metal straps.
3.4 protective layer construction method:
Insulation structure appearance must be set protective layer (shell), generally USES glass wool cloth, plastic sheeting, linoleum wrapped or use a metal shell.
3.4.1 track with glass cloth, plastic sheeting bound up, vertical tube should be bottom-up, horizontal tube is from low to high order. Start should be bound up again after 2 laps spiraling bound up, lap width should be half width, starting point and end point application of adhesive bonding or galvanized iron wire banding.
And the width of the lap joint should be bound up tight uniform, no loose, flanging, buckling and bulge, surface should be smooth.
3.4.2 brush fire protection coating or paint, glass cloth brush before should clear the dust on the pipeline, the oil. Painting on the dip coating shoulds not be too much to prevent falls to the ground or on other devices.
Rule 3.4.3 metal coating materials, appropriate USES galvanized steel sheet or thin aluminum alloy plate. When using common plate, its inside and outside surface coating antirust paint.
Riser should be bottom-up, horizontal tube from pipe low to high order, make the horizontal seam lap in the direction of the slope. Longitudinal lap seam should be put in tube on both sides, seam side down. If use flat seam, the seam should be 30 ~ 40 mm. Lap joints with self tapping screw or drawing rivet, cable tie fastening, screw spacing should be not more than 200 mm. Can not have shells or uneven phenomenon. With moistureproof layer of insulation shall not use the self tapping screw, so as not to prick moistureproof layer. Cover end should be closed.
3.5 comprehensive technical requirements:
3.5.1 track of pipelines through walls, floor board casing of the adiabatic, application effect of similar soft material filled.
3.5.2 thermal barrier using thermal insulation coating, should be layered daub, uniform thickness, can not have bubbles and leakage, surface solidification layer should be smooth, seamless, and shall not affect the normal operation of the valve.
4 quality standards
4.1 ensure projects:
4.4.1 material, specifications and fireproof performance of insulation materials must conform to the requirements for design and fire protection.
Inspection method: to observe the inspection, inspection certificate, do the fire test.
4.1.2 both sides of the valve, flange and other removable parts must leave space, again with the same heat insulation material to fill and tidy.
Inspection method: to observe the examination.
4.1.3 insulation and closed head must be closed the end of processing.
Inspection method: to observe the examination.
4.2 the basic items:
2 hard (soft) polyurethane foam plastic shell, hard (soft) polystyrene foam plastic pipe shell shall meet the following requirements: stick onto solid, no fault, shell should be uniform and tidy, flat-fell seam between the flat, horizontal seam should be staggered.
Inspection method: to observe the examination.
4.2.2 cotton blanket package shall meet the following requirements: two neighboring shell longitudinal seam should be 180 ° staggered, transverse joint should be hold to severe, should be wrapped, level off.
Inspection method: to observe the examination.
Holdings moistureproof layer shall meet the following requirements: should be closely paste tightly in thermal barrier, lap seam toward the low end, lap width should comply with the rules and should be uniform and tidy, sealing is good, no cracks and beautiful shape.
Inspection method: to observe the examination.
4.2.4 glass cloth, plastic sheeting coating shall meet the following requirements: moderately elastic, lap width even, smooth and beautiful.
Inspection method: to observe the examination.
4.2.5 sheet metal coating shall meet the following requirements: according to the well flow direction, the width of the uniform, interface level, fixation, beautiful appearance.
Inspection method: to observe the feet and check.
4.3 allowable deviation projects:
Thermal insulation layer of flatness, thickness of the insulation blanket deviation and inspection method should be allowed to meet the provisions of table 4-42.
Insulation test method of flatness, thickness of the insulation blanket and the allowable deviation table 4-42
Will project allowable deviation (mm) test method
Spray pipe shell and coating
5 loose material or soft materials
In 1 m ruler and 10
Wedge feeler check
+ 0.10 the delta
0.05 the delta with steel needle piercing the adiabatic
Layer and the ruler quantity check
Note: the delta for the thickness of the insulation blanket.
5 finished product protection
5.1 insulation materials should be kept in dry place safekeeping, measures should be deposited in the open air moisture, rain, snow, prevent extrusion deformation damage (such as mineral fiber material).
5.2 under construction should strictly follow after the first when, after the first outside the construction principle, to ensure that the construction of the thermal insulation layer is not damaged.
5.3 operating personnel in the construction of solid extrusion or put the tool on the construction has good thermal barrier.
5.4 removed scaffolds shall not be damaged when the insulation layer due to scaffolding or other factors were not construction should be mended in time, shall not be missed.
5.5 when crossing with other type of work assignments should pay attention to protect the finished products together, has put the place that the doors and Windows should be close to lock the door after work.
6 should pay attention to the quality problem of the 43) (table 4 -
Should pay attention to quality problems and control measures of table 4-43
The quality problem of the serial number often produce for prevention measures
1
2
3
4
5 galvanized iron wire loose knot
Insulation tight smooth enough
Pipe wear floor wall ChuJie dew
Glass cloth, plastic sheeting loose knot
Paint brush it is forbidden to spiral winding leakage fire retardant coating
To strengthen the sense of responsibility in accordance with the process operation
Fill filled insulation material
Adhesive binding should firmly strengthen inspection
To strengthen the sense of responsibility check
7 quality records
7.1 shall check the inspection record sheet.
7.2 take cover engineering inspection records.
7.3 cooling pipe insulation quality inspection evaluation form.
1 scope
The technology standard is suitable for use in air conditioning refrigeration pipe heat preservation engineering in the system.
2 construction preparation
2.1 material and main equipments:
2.1.1 insulation materials should comply with the regulations of design and has a factory qualified certificate or test report.
2.1.2 insulation materials with polyurethane rigid foam plastic (soft) shell, hard (soft) polystyrene foam plastic shell, rock wool pipe shell, etc. The above material should be small coefficient of thermal conductivity, have a certain strength to withstand from the medial and lateral water wet or gas penetration, does not contain corrosive substances, non-combustible or won't burn, convenient for construction.
2.1.3 insulation material at the scene of the storage, transportation and storage process should not be affected by damp and mechanical damage.
2.1.4 hand electric drill, inadvertently, wire cloth scissors, pliers, screwdriver, putty knife, small oil brush, float, barrels, hook, etc.
2.2 operation conditions:
2.2.1 flame retardant material must be flame retardant performance verification, qualified rear can use.
2.2.2 pipe insulation construction must be in the system pressure test leak detection qualified, anticorrosive processing after the end.
2.2.3 site should be clean, good lighting. In winter and the rain period construction should be frost sleet prevention measures.
2.2.4 the steam-water pipes not liner should supplement the defect or packing. Instrument to take over the parts have been installed.
2.2.5 should be the builder of the technology, quality, safety disclosure in writing. Before the heat preservation should be hidden.
3 operation process
3.1 process:
Implicit check - generally according to the thermal barrier - moistureproof layer - > layer construction and inspection of order.
3.2 thermal barrier construction method
3.2.1 straight pipe riser should order from bottom to top, horizontal tube should from the side or bend the straight pipe in order.
3.2.2 rigid insulation blanket shell, can use 16 ~ 18, galvanized iron wire twin strapping, strapping spacing should not be greater than 400 mm, and bonding material closely paste on the pipeline. The gaps between the shell and should not be greater than 2 mm binding material jointing filled with circular seam should be staggered, stagger distance not less than 75 mm, tube and shell longitudinal seam should be located in the left and right side of the pipe axis, when thermal barrier is greater than 80 mm, the thermal barrier should be laid, two layer should be seam pressure between the layers.
3.2.3 semi-hard and soft, thermal insulation products of the thermal barrier can be used packaging steel strip, galvanized steel wire for 14 ~ 16th banding. The banding spacing, semi rigid insulation products should not be greater than 300 mm; For soft no greater than 200 mm.
3.2.4 strapping on each thermal insulation products, shall not be less than two.
3.2.5 shall not adopt spiral twisting enlacing.
3.2.6 elbow finalize the design of the bend tube shell should be used or processed into dried shrimp with straight pipe shell waist blocks, each bend shall be not less than 3 pieces, to ensure that the tube shell and tube wall together, beautiful and smooth.
3.2.7 equipment on the pipeline valve, flange and other removable parts insulation should be set aside bolt length plus 25 mm gap on both sides. For thermal insulation valve, flange parts should be separately (FIG. 4-39).
3.2.8 ZhuGanGuan assembly should do first, after the branch pipe. All through the building insulation around the casing pipe and the pipe heat preservation material filling close clearance application.
3.2.9 thermometer on the pipe socket should be higher than the design of insulation layer thickness. No thermal insulation pipe don't with thermal insulation pipe laying, heat preservation pipe should be to keep enough distance between buildings.
3.3 moistureproof layer construction method:
3.3.1 vertical tube should be bottom-up, horizontal tube from high to low order, ring to seam should be toward the low end.
3.3.2 rainfall distribution on 10-12 moistureproof layer should be closely paste on the insulation, sealing good, thickness uniform tension, no bubbles, wrinkles, cracks and other defects.
3.3.3 do moistureproof layer with coil, usable spiral winding way solid paste on the insulating layer, beginning should be around 2
After spiral wound again, lap width straight to 30 ~ 50 mm.
We made moistureproof layer, felt paper available lapped bandage, lap width of 50 ~ 60 mm. Linoleum interface should be down, and the asphalt emperor grease seal, each 300 mm galvanized a lead wire or metal straps.
3.4 protective layer construction method:
Insulation structure appearance must be set protective layer (shell), generally USES glass wool cloth, plastic sheeting, linoleum wrapped or use a metal shell.
3.4.1 track with glass cloth, plastic sheeting bound up, vertical tube should be bottom-up, horizontal tube is from low to high order. Start should be bound up again after 2 laps spiraling bound up, lap width should be half width, starting point and end point application of adhesive bonding or galvanized iron wire banding.
And the width of the lap joint should be bound up tight uniform, no loose, flanging, buckling and bulge, surface should be smooth.
3.4.2 brush fire protection coating or paint, glass cloth brush before should clear the dust on the pipeline, the oil. Painting on the dip coating shoulds not be too much to prevent falls to the ground or on other devices.
Rule 3.4.3 metal coating materials, appropriate USES galvanized steel sheet or thin aluminum alloy plate. When using common plate, its inside and outside surface coating antirust paint.
Riser should be bottom-up, horizontal tube from pipe low to high order, make the horizontal seam lap in the direction of the slope. Longitudinal lap seam should be put in tube on both sides, seam side down. If use flat seam, the seam should be 30 ~ 40 mm. Lap joints with self tapping screw or drawing rivet, cable tie fastening, screw spacing should be not more than 200 mm. Can not have shells or uneven phenomenon. With moistureproof layer of insulation shall not use the self tapping screw, so as not to prick moistureproof layer. Cover end should be closed.
3.5 comprehensive technical requirements:
3.5.1 track of pipelines through walls, floor board casing of the adiabatic, application effect of similar soft material filled.
3.5.2 thermal barrier using thermal insulation coating, should be layered daub, uniform thickness, can not have bubbles and leakage, surface solidification layer should be smooth, seamless, and shall not affect the normal operation of the valve.
4 quality standards
4.1 ensure projects:
4.4.1 material, specifications and fireproof performance of insulation materials must conform to the requirements for design and fire protection.
Inspection method: to observe the inspection, inspection certificate, do the fire test.
4.1.2 both sides of the valve, flange and other removable parts must leave space, again with the same heat insulation material to fill and tidy.
Inspection method: to observe the examination.
4.1.3 insulation and closed head must be closed the end of processing.
Inspection method: to observe the examination.
4.2 the basic items:
2 hard (soft) polyurethane foam plastic shell, hard (soft) polystyrene foam plastic pipe shell shall meet the following requirements: stick onto solid, no fault, shell should be uniform and tidy, flat-fell seam between the flat, horizontal seam should be staggered.
Inspection method: to observe the examination.
4.2.2 cotton blanket package shall meet the following requirements: two neighboring shell longitudinal seam should be 180 ° staggered, transverse joint should be hold to severe, should be wrapped, level off.
Inspection method: to observe the examination.
Holdings moistureproof layer shall meet the following requirements: should be closely paste tightly in thermal barrier, lap seam toward the low end, lap width should comply with the rules and should be uniform and tidy, sealing is good, no cracks and beautiful shape.
Inspection method: to observe the examination.
4.2.4 glass cloth, plastic sheeting coating shall meet the following requirements: moderately elastic, lap width even, smooth and beautiful.
Inspection method: to observe the examination.
4.2.5 sheet metal coating shall meet the following requirements: according to the well flow direction, the width of the uniform, interface level, fixation, beautiful appearance.
Inspection method: to observe the feet and check.
4.3 allowable deviation projects:
Thermal insulation layer of flatness, thickness of the insulation blanket deviation and inspection method should be allowed to meet the provisions of table 4-42.
Insulation test method of flatness, thickness of the insulation blanket and the allowable deviation table 4-42
Will project allowable deviation (mm) test method
Spray pipe shell and coating
5 loose material or soft materials
In 1 m ruler and 10
Wedge feeler check
+ 0.10 the delta
0.05 the delta with steel needle piercing the adiabatic
Layer and the ruler quantity check
Note: the delta for the thickness of the insulation blanket.
5 finished product protection
5.1 insulation materials should be kept in dry place safekeeping, measures should be deposited in the open air moisture, rain, snow, prevent extrusion deformation damage (such as mineral fiber material).
5.2 under construction should strictly follow after the first when, after the first outside the construction principle, to ensure that the construction of the thermal insulation layer is not damaged.
5.3 operating personnel in the construction of solid extrusion or put the tool on the construction has good thermal barrier.
5.4 removed scaffolds shall not be damaged when the insulation layer due to scaffolding or other factors were not construction should be mended in time, shall not be missed.
5.5 when crossing with other type of work assignments should pay attention to protect the finished products together, has put the place that the doors and Windows should be close to lock the door after work.
6 should pay attention to the quality problem of the 43) (table 4 -
Should pay attention to quality problems and control measures of table 4-43
The quality problem of the serial number often produce for prevention measures
1
2
3
4
5 galvanized iron wire loose knot
Insulation tight smooth enough
Pipe wear floor wall ChuJie dew
Glass cloth, plastic sheeting loose knot
Paint brush it is forbidden to spiral winding leakage fire retardant coating
To strengthen the sense of responsibility in accordance with the process operation
Fill filled insulation material
Adhesive binding should firmly strengthen inspection
To strengthen the sense of responsibility check
7 quality records
7.1 shall check the inspection record sheet.
7.2 take cover engineering inspection records.
7.3 cooling pipe insulation quality inspection evaluation form.
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