Weak current College】 【air-conditioning installation technology programme 2.

<br> 4.12 hot and cold water system installed <br> 4.12.1 the project pipeline have air conditioning and hot water, cooling water, steam and condensate pipes. <br> 4.12.2 pipes, pipe fittings, valve must have factories manufacturing .license, certification, materials quality, indicators should be consistent with the appropriate national standards, its model specifications should meet the design requirements, before construction should be carried out according to design drawings. <br> 4.12.3 strictly according to the design and process .requirements, select the pipeline of hangers, pipe hangers of form, materials, size, precision machining and welding should be consistent with the pipe hangers S161 "requirements. To prevent heat bridge, chilled water piping and hangers with insulating layer between thickness of wood. .<br> 4.12.4 hot and cold water pipe diameter greater than DN50, seamless steel tube; less than or equal to DN50, welded steel tubes. When the DN ¡ý 40mm stewed with welding, the use made of the elbow; when the .DN <40mm, silk condensation pipe received; all are made of galvanized steel wire. Steam and condensate pipes with seamless welding. Cooling water pipe used to suppress the elbow. <br> 4.12.5 pipeline installation should be horizontal even vertical, arranging .the installation of pipelines and valves should be in the same plane, deviation does not exceed 3mm, pipeline installation of coordinates and elevation should meet the design requirements. <br> 4.12.6 pipe slope should be based on the design and specification requirements set, .hot and cold water slope 0.002, to, return pipe slope to the consistent orientation to the slope of the water, condensate pipe slope 0.05, pipe diameter size header should be eccentric, gas pipeline so that the tube bottom flat, conveying liquids pipeline so that .the tube top flat to drain and vent. <br> 4.12.7 Underground pipelines are connected with the outdoor dry pipe must be set when the shock hose. Pipeline through walls and floors, you should set the casing, the casing of the wall and .ceiling surfaces, flat to 20mm than floors high, and the inner diameter of the outer diameter of the larger casing than 20 - 30mm. underground wear out outdoor waterproof casing pipe must be set. <br> 4.12.8 flanges, weld and the other .connected parts installation location should be convenient for maintenance, not close to the walls, floors, and taking into account insulation operations easier. Pipe butt weld or flange interface must avoid overlap with hangers. <br> 4.12.9 horizontal pipe on valve handwheel on .installation as possible, lifting type check valve, pressure relief valve, etc., must be installed in horizontal pipes. Conveying of steam pipe pipes from the top of the dry pipe or side-out, conveying liquids pipeline branch pipes should be received from the .bottom or side. <br> 4.12.10 piping connection is carried out in accordance with the following requirements. <br> A £ ® good must be geared to the size of the cut, the required Groove, cleanup finished pipe organs or molten slag .. <br> B £ ® shall not powerful counterparts, particularly in connection with the device. <br> C £ ® and device connection should be soft. <br> 4.12.11 pipe welds of location must meet the following requirements: <br .> A £ ® straight two annular gap spacing of not less than 100mm, and not less than the diameter. <br> B £ ® seam distance from bending point must not be less than the 100mm, and not less than the diameter. <br .> C £ ® girth distance hangers spacing greater than 50mm.d. pipes shall be vertical and horizontal weld, welding bracket holes and other instruments. <br> 4.12.12 welding requirements: <br> A £ ® induction welding personnel must have the .certificate of welding operations. <br> B £ ® welding materials must have proof of certification, materials, and stored in dry places. <br> C £ ® are not allowed in the rain, snow or strong wind or the temperature is below 0 .degrees centigrade of welding, such as the site does not meet the conditions of protection measures should be taken. <br> 4.12.13 welding jobs a. welding materials: pipes, welding rods used E4303.b Q235AF. electrodes shall be protected from moisture ., such as wet and dry before use. <br> C £ ® welding procedures d £ ® the welding Department polished Groove, Groove to V60 °, t-45 ° welding Groove, tube y butt Groove to 30 °. <br> E .., both inside and outside the mouth of the slope the greasy dirt, rust and other clean, counterpart Department stay 1mm clearance. <br> F when first used. welding φ 2 £ ® 5 electrodes make welding again, and then uses the φ .3.2 ~ φ 5 electrode welding. <br> G.-welding fine after each layer with electric wire brush will weld clean to prevent surface defects affect welding quality. <br> H welding process parameter, as follows <br> Rod diameter mm current .polarity current A2.5 AC 50-803.2 100-1304 AC 160-270 AC 200-2105 <br> I £ ® weld flaw without authorization handling when welders, should identify the reasons for setting out patching process and then processed. <br> .After the welder welding j., clear stripping residues and splash, check the appearance of quality, qualified in seam seal on one side. <br> K. quality requirements: weld should avoid oversize, welding tumor, undercuts, crater, surface porosity, .crack, incomplete penetration, and flux slag, and other defects. Each time the welding to weld appearance for full examination. The weld quality has reached grade requirements for pipeline welds Ⅳ of threaded connector sealing material selection lead Yau Ma, tighten the thread not sealing .materials into the pipe. <br> 4.12.14 piping is installed, you must press the design requirements and specifications on the pipeline system to partition and subsystems for washing, strength and tightness test, medium is water, hardness testing on pressure working pressure of .1.5 times. Pipeline flushing programmes must be in the pipeline installation, under field conditions agreed with the owner supervision to take or system fragmented washing programmes. flushing <br> 4.12.15 pipeline system flushing and testing before you must meet the following conditions: < .br> A £ ® piping system construction is complete and meets the design requirements and the relevant provisions. <br> B £ ® hangers installed, welding work is over, and has been tested and qualified, welds and other parts should be checked without painting .and insulation. <br> C £ ® system emptying, hydrophobic, control system has been set up to implement the water has passed. <br> D £ ® test equipment in good condition, the pressure gauge accuracy by validating unqualified, not lower than .class 1.5, dial scale value for the test pressure manometer 1.5 times, no less than 2 blocks. <br> 4.12.16 pipe test, must be sent by hand, demolition of blind plate, while the guardian matching records, and promptly complete the .system pressure test record, and sent the owner, supervisor, and other relevant personnel checked. <br> 4.12.17 pipeline pressure test qualified before the pipes before rinsing, washing equipment must be carried out before the pipe to prevent short circuit, the deposition .of filth in equipment, washing is first put on each floor and trunk pipe connection disconnect for washing, after flushing water main, access from most high-end to visually clean water flow of saliva, and fill in the eligibility system flushing record, and sent .the owner, supervisor, and other relevant personnel checked. <br> 4.13 duct insulation <br> 4.13.1 all indoor air pipes are made of insulation, insulation paste with rock wool, glass-fibre fabric, outsourcing brush fire retardant paint. Duct .across the floor, wall and pipe wells, installing application non-burning material after a lookout and wall or floor to fill the gap between the reality. <br> 4.13.2 all static pressure Chamber is required to be lined with material is flame retardant .polyurethane foam coarse, paste strong with reinforcement bars. <br> 4.13.3 rectangular duct with insulation sheet insulation nail pressure plate fixed method, will wipe the surface wind pipe, the insulation nails used adhesive bonding in the wind pipe surface, solid will cling .to the wind tube sheet, use insulation nail pressure lid fastened, flat, and then make aluminum foil paper reinforced outer protection layer, use aluminum foil tape adhesive joints and aluminum Platinum break part stuck strictly to guarantee the tightness of the moisture level. <br .> 4.13.4 duct flange Department thermal insulation to duct connections on the gap to fill insulation scrap, a layer on the outside of the paste, paste layer moisture layer width is greater than $ void 50mm. Finally all wrapped with fiber glass insulation, exterior .paint brush fire twice. <br> 4.14 pipes and steam pipe insulation <br> Cold and hot water pipe insulation 4.14.1 should meet the design requirements, pipe installation and before construction, pressure washing, to be qualified. <br> 4.14. .2 the insulation requirements have factory certification, performance indicators should meet the design requirements. Air conditioning and hot water pipe, steam pipe insulation materials used Armstrong insulation, all seams are glue bonding. <br> 4.14.3 pipe flanges, valves of insulation should .consider separate replace demolition, insulation layer there should leave enough empty space, usually bolt length plus 25mm, then with the same material insulation to fill gaps, the outer wrap fiberglass cloth fixed fire protection paint brush, and twice in order to replace, the demolition .of the flange is not undermined either side of the insulation layer. <br> 4.14.4 frozen pipe construction must ensure its moisture-proof coating of rigour, integrity to prevent condensation. <br> 4.15 ventilation air conditioning system debugging. <br> .4.16 debugging preparation <br> 4.16.1 power installation work is complete before checking before the competency. <br> 4.16.2 debugging before Visual inspection: check all the control units are consistent with the design, check wiring is correct. <br> .4.16.3 master system control theory and control process. <br> 4.16.4 hands up moving the device, check to see if any anomalies. <br> 4.16.5 check all equipment required to lubricate parts has come. <br> 4.17 .commissioning <br> 4.17.1 empty load test run should be electrical and mechanical joint inspection, the correct rear allows for empty-load operation, operational requirements and checks the project should proceed, and for the record <br> 4.17.2 air conditioners ., fans, water chillers, water pumps, and other stand-alone commissioning, in compliance with the design requirements and equipment specifications and specification requirements, you should move, determine the right direction, no abnormal sound before you can run. <br> 4.18 .air-conditioning system combined with debugging <br> 4.18.1 ventilation and air-conditioning system debugging, commissioning the system stand-alone qualified before. <br> 4.18.2 the joint operation of the air-conditioning system, should, in conjunction .with the owner and design, automatic control and construction units, equipment manufacturers, integrated debugging scenarios developed strictly according to the design requirements and scenarios. <br> 4.18.3 after commissioning, the newspaper for acceptance of party, transfer the corresponding information for commissioning .acceptance procedures. <br> <br> <br>.