When the outer shell insulation layer is sealed with adhesive tape, the joint can be well sealed.
Each metal plate shall be provided with two supporting rings.
For curved surface equipment, the two plate joints of the cotton plate shall be cut into oblique openings for splicing, and the pin sleeve self-locking plate is usually used for fixation.
1、 Construction preparation 1 Main materials: performance of thermal insulation materials.
2.2.4 when the thickness of the insulation layer exceeds 80mm, it shall be insulated in layers, and the double-layer or multi-layer cold insulation layer shall be laid in staggered joints and bound in layers.
However, it shall deviate from the center line of the pipeline.
When direct welding on the equipment is not allowed, hoop type supports shall be used.
It should be made of ordinary carbon steel plate or section steel.
The corners shall be wrapped with galvanized iron sheet and then bound.
2.2.11 special hook nails and pins are generally used for the installation of hook nails or pins.
When multiple shaped thermal insulation products with large pipe diameter are used, the longitudinal joint position of the thermal insulation layer may not be limited.
When more than two layers of thermal insulation products are used, not only the same layer shall be staggered, but also the inner and outer layers shall be pressed, and the overlapping length shall not be less than 50mm.
Polystyrene foam tube and so on.
The specifications shall meet the design requirements and have certificates.
When nails are used to fix the insulation layer, the spacing shall be 250-350mm; When used to fix the metal outer protective layer, the interval shall be 500-1000mm; The end of each metal plate shall not be less than 2 nails.
2.2.13 the width of the support shall be 10mm less than the thickness of the insulation layer, but not less than 20mm.
When welding hook nails or pins, the position of each hook nail or pin shall be drawn on the equipment and pipe wall in staggered or opposite lines with chalk line.
2.2.5 during the overall insulation of equipment and pipeline supports, hangers, flanges, valves, manholes and other parts, a certain loading and unloading clearance shall be reserved.
1.2.2 others: steel tape, steel needle, guiding rule, wood feeler gauge, etc.
For the pipe shell with thermal insulation layer at the composite part, the protective paper inside the lap joint at the notch part shall be disassembled, and the lap joint shall be pressed and pasted flat.
2.2 construction of thermal insulation layer 2.2.1 setting of thermal insulation fixing and supporting parts: the bearing ring (or hoop) of thermal insulation layer shall be set at intervals between vertical pipes and equipment, and its width shall be 2 / 3 of the thickness of thermal insulation layer.
Except for the pipes specified in the design to be insulated according to the tube bundle, the rest shall be insulated separately.
During construction, the cotton plate shall be close to the outer wall of the equipment.
Note that the thermal insulation structure after construction shall not hinder the sliding of the movable support.
2.2.10 generally, the joint width of thermal insulation products shall not be greater than 5mm, and attention shall be paid to staggered joints during construction.
1.3.3 the supports, hangers, structural accessories and instrument connecting parts of equipment and pipeline have been installed, and hardwood mats have been set according to different conditions for moisture-proof treatment.
After the overall insulation and protective layer construction are completed, local insulation treatment shall be carried out.
The spacing shall not be greater than 350mm.
The supporting parts shall not be set at the position with accessories, the ring surface shall be set horizontally, and the installation error between each bracket rib plate shall not be greater than 10mm.
When the horizontal pipeline is insulated.
2.2.7 thermal insulation layer shall be laid at the end of the pipeline or the part with blind plate, and shall be sealed.
The insulation layer after construction shall not cover the equipment nameplate.
The cut is located below the side of the pipe.
2.2.3 the plate is used for insulation of flat wall or large curved surface equipment.
When the metal outer protective layer is fixed with a support ring, the spacing of each support ring shall be 1200-2000mm.
If the insulating layer around the nameplate is cut into a horn shaped opening, the opening shall be sealed neatly.
The installation spacing between vertical equipment and vertical pipe supports with nominal diameter greater than 100mm shall depend on the looseness of thermal insulation materials..
Commonly used materials are: rock wool slag cotton joint felt, rock wool and mineral wool pipe shell, ultra-fine glass cotton products, glass wool felt, glass cotton shell plate, porous calcium silicate products, rigid polyurethane plastic, foam glass, aluminum silicate products, cement perlite products, hydrophobic perlite products.
Number of hook nails or pins per unit area: no less than 6 / m2 at the side and no less than 8 / m2 at the bottom.
1.2 main machines and tools 1.2.1 tools: steel scissors, cloth scissors, hand hammer, chopper, hook, hammer, ash bucket, hand trowel, arc trowel, etc.
2.2.8 when the insulation layer at the four corners of square equipment or square pipeline is laid with insulation products, the four corner joints shall be made into cover lap joints, and vertical through joints shall not be formed.
2.2.2 the pipe shell is used for thermal insulation of pipes less than DN350.
2.2.12 for the installation of support, the material of support shall be determined according to the material of equipment or pipeline.
1.3 operating conditions 1.3.1 strength test and air tightness test of equipment and pipelines are qualified; 1.3.2 remove the dirt and rust on the surface of insulated equipment and pipeline, and apply anti-corrosion coating.
1.3.4 preparation for fixing supports in place; 1.3.5 electric heat tracing or heat medium pipes have been installed and passed the power on or pressure test; 1.3.6 complete the handover procedures of equipment and pipeline installation, welding, anti-corrosion and other processes 2、 Operation process 2.1 process flow: Construction of thermal insulation layer → construction of protective layer → paint → inspection of anti-corrosion layer → inspection of thermal insulation layer → inspection of protective layer → handover and acceptance of thermal insulation project.
The inner diameter of the selected pipe shell shall be consistent with the outer diameter of the pipe.
2.2.6 the insulation thickness and density of thermal insulation cotton felt and pad shall be uniform, the shape shall be regular, and the unit weight after compaction and binding must meet the installation unit weight specified in the design.
During construction, the cut part of the pipe shell shall be opened and sleeved on the pipe.
2.2.9 the longitudinal joint position of the horizontal pipeline shall not be arranged within 450 of the vertical center line of the pipeline.
Also available ф 3 ∽ 6mm galvanized iron wire or low carbon round steel, directly welded on carbon steel equipment or pipeline.
For equipment not suitable for welding pins, steel belts can be used for binding, with a spacing of not less than two layers for each cotton board.
The adjacent two sections of pipe shells shall be close, and the gap shall be pasted with pressure-sensitive tape; The pipe shell without outer protective layer can be bound with galvanized iron wire or plastic rope, and each section of pipe shell can be bound for 2-3 times.
