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　　Heat insulation treatment of ventilation pipe

　　A. 通風管道及部件絕熱工程

　　A. heat insulation of ventilation pipes and components

　　① 根據通風管道的斷面尺寸和所處的部位確定絕熱固定釘的數量。

　　① determine the number of heat insulation fixing nails according to the section size and position of the ventilation pipe.

　　② 確定固定釘位置后，先將通風管道壁上的塵土、油垢擦凈，再將粘接劑分別涂抹在通風管道壁面和保溫釘的粘接面上，稍后再將其粘接在一起。固定釘粘牢后應待12~24h后再覆鋪絕熱材料。

　　② after fixing the nail position, first wipe the dust and oil dirt on the wall of the ventilation pipe, then apply the adhesive on the wall of the ventilation pipe and the bonding surface of the insulation nail respectively, and then bond them together later. After the fixing nails are firmly adhered, they shall be covered with thermal insulation materials after 12-24 hours.

　　③ 絕熱材料下料要準確，套裁下料，切割面要平齊，搭接處不要有縫隙。縱橫縫錯開，小塊材料應盡量用于通風管道上平面中間部位。

　　③ the cutting of thermal insulation material shall be accurate, the cutting surface shall be flat and flush, and there shall be no gap at the lap joint. The longitudinal and transverse joints shall be staggered, and small pieces of materials shall be used as far as possible in the middle part of the upper plane of the ventilation pipe.

　　④ 明裝矩形通風管道絕熱應在四角加設鍍鋅鋼板包角，并用鍍鋅鐵絲固定或打包帶卡緊。

　　④ for the heat insulation of the exposed rectangular ventilation pipe, the galvanized steel wrap angle shall be added at the four corners, and the galvanized iron wire shall be used for fixing or clamping.

　　⑤ 絕熱層外纏玻璃絲布保護層時，先將玻璃絲布按通風管道斷面尺寸的大小裁成幅寬為200~400mm的長條，并卷成小卷備用。也可根據通風管道斷面尺寸的大小、直徑選用定型加工的不同幅寬的玻璃絲布。纏繞時，先用“∏”形鐵釘固定端頭，然后拉緊玻璃絲布纏繞。邊纏繞、邊整平，不得有折皺、翻邊等現象。圈與圈間兩邊搭接處的搭接寬度一般應為30~50mm。末端一定要用“∏”形鐵釘固定，否則容易松動、脫落。

　　⑤ when wrapping glass fiber cloth protective layer outside the thermal insulation layer, first cut the glass fiber cloth into a strip with a width of 200-400mm according to the size of the cross-section of the ventilation pipe, and roll it into a small roll for standby. According to the size and diameter of the cross-section of the ventilation pipe, the glass cloth with different width can also be selected. When winding, first fix the end with "Π" iron nail, and then tighten the glass cloth for winding. While winding and leveling, there shall be no wrinkling, flanging and other phenomena. The lap width of the lap joint between the ring and the two sides of the ring shall be generally 30 ~ 50mm. The end must be fixed with Π shaped iron nails, otherwise it is easy to loosen and fall off.

　　⑥ 玻璃絲布外表面根據設計要求涂刷一道或兩道防火涂料，涂層應嚴密、均勻。

　　⑥ one or two layers of fireproof coating shall be applied on the outer surface of glass cloth according to the design requirements, and the coating shall be tight and uniform.

　　⑦ 室外明露通風管道在保溫層外還應加一層鍍鋅鋼板或鋁板做保護外殼，外殼間搭接處采用拉鉚固定，搭接縫用密封膠密封。

　　⑦ a layer of galvanized steel plate or aluminum plate shall be added to the outdoor exposed ventilation pipe outside the insulation layer as the protective shell. The lap joint between the shells shall be fixed by riveting, and the lap joint shall be sealed by sealant.

　　B. 制冷、制熱管道絕熱工程

　　B. refrigeration and heating pipeline insulation works

　　①聚苯乙烯泡沫塑料瓦殼絕熱結構。

　　(1) polystyrene foam shell insulation structure.

　　a. 首先將保溫瓦合扣在管道處面，每隔300~350mm用φ1.2mm鍍鋅鐵絲綁扎牢固（鐵絲斷頭建議嵌入保溫瓦內），瓦與瓦之間的縫隙用石棉硅藻土填補抹平。

　　A. firstly, the insulation tile shall be buckled on the surface of the pipeline, bound firmly with φ 1.2mm galvanized iron wire every 300 ~ 350mm (the broken end of the iron wire must be embedded in the insulation tile), and the gap between the tile and the tile shall be filled and leveled with asbestos diatomite.

　　b. 保溫瓦外包一道塑料薄膜，再包一道玻璃絲布。包扎時將玻璃絲布裁成幅寬在200~300mm，纏繞搭接寬度為50~80mm。

　　B. the insulation tile shall be wrapped with a plastic film and a glass cloth. When binding, the glass fiber cloth shall be cut into a width of 200-300 mm, and the width of winding and overlapping shall be 50-80 mm.

　　c. 玻璃絲布外涂兩道調合漆。

　　C. apply two coats of ready mixed paint on the glass cloth.

　　② 氈狀材料絕熱結構。

　　② felt material insulation structure.

　　a. 管道外用保溫氈捆扎，捆扎時注意搭接邊要貼緊。絕熱層外每隔300~350mm用φ1.2mm鍍鋅鐵絲綁扎。包完層后，再包第二層，層數根據所需厚度決定。多層捆扎要縱橫縫隙交錯、填滿并密封嚴格。

　　A. the outer part of the pipeline shall be bound with insulating felt, and the overlapping edge shall be tightly attached during binding. The insulation layer shall be bound with φ 1.2mm galvanized iron wire every 300 ~ 350mm. After the first layer is wrapped, the second layer is wrapped. The number of layers depends on the required thickness. The multi-layer binding shall be staggered, filled and sealed strictly.

　　b. 絕熱層外包一層瀝青油氈，接縫處要搭接嚴密，并用φ1.2mm鍍鋅鐵絲綁扎牢固。

　　B. the thermal insulation layer shall be wrapped with a layer of asphalt felt, and the joints shall be tightly overlapped and bound with φ 1.2mm galvanized iron wire.

　　c. 油氈外包玻璃絲布，將玻璃絲布裁成幅寬在200~300mm，纏繞搭接寬度為50~80mm。外表面涂刷兩道調合漆。

　　C. wrap the linoleum with glass fiber cloth, cut the glass fiber cloth into a width of 200-300 mm, and wrap the overlapping width of 50-80 mm. The external surface shall be painted with two coats of mixed paint.

　　③ 管道的支、吊、托架絕熱方法。

　　③ heat insulation method of pipe support, hanger and bracket.

　　a. 管道的支、吊、托架使用的木墊塊，應浸漬瀝青防腐，并按管徑定型加工。

　　A. the wood blocks used for the support, lifting and bracket of the pipeline shall be impregnated with asphalt for corrosion prevention and processed according to the pipe diameter.

　　b. 直接接觸管道的支、吊、托架建議進行絕熱處理，其絕熱層長度不得小于絕熱層厚度的4倍，否則應敷設于墊木處。

　　B. the supports, hangers and brackets that directly contact with the pipeline must be insulated, and the length of the insulation layer shall not be less than 4 times of the thickness of the insulation layer, otherwise it shall be laid on the skid.

　　④ 管道上的閥門、法蘭及其他可拆卸部件絕熱兩側應留出螺栓長度加25mm的間隙。閥門、法蘭部位應單獨進行絕熱。

　　④ the length of bolts plus 25 mm clearance shall be reserved on both sides of the heat insulation of valves, flanges and other removable parts on the pipeline. The valve and flange shall be insulated separately.