Weak current College】 【HVAC construction technology measures.

<br> <br> 1. organizes the concerned personnel familiar with drawings, field construction personnel security technology gives the low-down. <br> 2. in the field and the construction drawing control, draw sketches. According to the project progress organizational .materials purchased in batches, processing order according to the first post, on the first big after small principle. <br> 3. check the wind tube made of galvanized steel and angle steel and materials of quality, no factory certification or quality of the identification .of the file are not allowed to use. And galvanized surfaces must be smooth, uniform thickness, no obvious pressure wound phenomenon, and there shall be no cracks, scarred, Gill edge, rust, Watermarking and other defects, have galvanized coating crystalline patterns; .angle to wait type evenly, no crack distortion and other defects affecting quality. <br> 4. processes <br> 5, in the form of a single bite bite bite or corner, as shown in the figure on the right: <br> .Pittsburgh width table <br> Plate thickness flat bite width B Kok bite width B <br> 0.7 following 6-86-7 <br> 0.7 - 1.08-107-8 <br> 6. making the wind pipe and fittings in steel sheet .thickness requirements of the table below: <br> Long edge size or diameter (mm) circular duct rectangular duct in low voltage <br> 80 ~ 3200.50.5 <br> 340 ~ 4500.60.6 <br> 480 ~ 6300.8 <br> .670 ~ 10000.8 <br> 7, the wind pipe and pipe fitting surfaces must be smooth, longitudinal received every bite should be staggered, except the width should be tight and evenly, no holes-bite and splitting and other defects. <br> 8 ., flanges manufacture, with the specifications to the adoption of uniform mould in order to maintain the flange sizes consistent and surface is smooth, flange bolt hole you want to drill in pairs, the spacing is not greater than 150 mm. Flange and adjusting valve components .such as join, to guarantee its dimensions and part flange dimensions. <br> 9, flange diameter than the wind to the outer diameter slightly larger than 2-3 mm, bored when making holes in steel angle (minus thickness) or flat in the .Centre of the principles that are arranged in any Rotary flange, four of the screw can be aligned. For rectangle flange, two bolt holes on the edges are aligned. Angle steel flange of the facade and the plane should ensure mutual to 90 degrees. < .br> 10, duct and angle steel flanges, pipe wall thickness is less than or equal to 1.5 mm, flange riveting, riveting part should be in the flange outside. <br> 11, the wind pipe and flange connections, such as flange, .flange dimensions should be 6-9 mm. Flanging should be flat, without holes. <br> 12, elbows, and tees to grind as a point of error, flanging and crossed by flanges, etc. <br> 13. to ensure project .quality, wind pipe production after taking reinforcement box strengthening measures to ensure that the flatness of the wind pipe and duct of stiffness, rectangular duct length is greater than or equal to 630 mm and insulation pipe length is greater than or equal to 800 mm in the .length of the pipe 1.2 m, take the reinforcement of the box, reinforcement box angle and wind pipe flanges and the same specifications. <br> 14, the wind pipe and pipe fittings produced by actual size, press the system part numbers to prevent transportation .and installation error occurred. In addition to stay section tube end flange is not fixed, to be field-installed by actual size adjustment on site. <br> (2) air duct installation <br> 1, site materials, semi-finished products .by part of the order and the different systems, the horizontal transport trolley with home-made double, vertical, transport, the transport with elevator in a finished product protection. <br> 2. check the field location of the reserve hole, size to .fit drawing requirements not, are there left out, reserve hole than wind pipe sections each size large 100 mm. <br> 3. will the wind pipe and components according to the number group on the review and then you can connect and install. < .br> Connection length depending on the wind tube wall thickness, flanges and duct connection methods, installation structure parts, lifting and other factors, but try to connect on the ground, usually add to 10-12 metres in length, but not the detachable interface ., mounted on the floor or wall. <br> 4. processes <br> <br> 5, duct installation hanger available expansion bolts fixed to the floor or beam, but the location you want to correct, solid and reliable, the lower portion .of the bolt hangers of elastic stroke due allowance for the wind pipe elevation, level of adjustment. <br> 6, cradles of spacing as 3 m, boom diameter is 10 mm round bars, angle iron beams, beams used in thermal insulation of external ., hanger and wind pipes, gasket pressure treated by 50 mm thick wooden side, the same long and beams, and hanging beam with wood screw connections. <br> 7, duct insulation with gridlines foil veneer glass wool felt (surface adopts the moisture tension .veneer), lap Office using tape seal. Thermal insulation pipe parts before to check eligibility, insulation layer surface must be flat and dense, crack, insulation nail quantity: / m2 side, only 20 to 10 only/m2 above. <br> 8 ., flange gasket material with 3-5 mm thick rubber sheet obturator LaTeX, every hoisting length control in 12 meters, the unit on and insulation in the erection of scaffolding, lifting operations at Delta hop on the escalator. <br> 9, valves, .and other parts to and duct at the group together, lifting, control valve installed in the operating position, the fire damper is system security appliance, there are horizontal, vertical, left and right-difference, the installation may not wrong, in order to .prevent loss, when installing the yirongpian caution, when installed in a vertical air duct of fire dampers, one must close yirongpian tilted 5 degrees. <br> 10, duct installation level degree allowable deviation 3 / 1000, total deviation is not greater than 20 .mm. Perpendicularity tolerance 2 / 1000. The total deviation is not greater than 20 mm, laid along the wall, for ease of operation is the distance from the wall of the tube wall is greater than 150mm. <br> 11, various outlet installation .and decoration closely, and ceiling synchronization, while achieving horizontal even vertical, the surface is smooth, and ceiling parallel, pull the air outlet: what do you think are in line. <br> (3) fan-coil and chilled water piping installation .<br> 1, according to design drawings called for, the return pipe DN ¡ .ü 50mm used galvanized pipe threaded connection, DN> 50mm uses seamless steel tubes, welded connections; use feedwater condensate pipe, connected to the rubber plastic pipeAdd-in. <br> 2, valve requirements: ≤ DN50 with all-copper gate valve, .threaded connections; DN50 "diameter with wafer butterfly valve, flange connection manually. <br> 3, the pipeline from the walls and beams, columns, near to a fixed support, remaining as a hanger, pipeline and supported, set the corresponding specifications between .the cradles of shingles and trustee, hanger crossarm 10A channel. <br> 4 ¡¢ materials required: <br> (1) tubing: the quality must be factory certification or identification documents, and shall not be bent, rust, fly, heavy .leather and uneven phenomenon. <br> (2) pipe fittings: must have factory certification, unbiased buckle, square buckles, buckles, broken wires and angle are not accurate. <br> (3) valve: must have factory certification, casting rules ., no burrs, no crack, switch flexibly structured, threads without injury, angle and angle of correct and strength to meet the requirements, hand wheel without injury. Installation should be carried out in accordance with the relevant provisions, tightness test of strength. < .br> (4) other materials: steel, steel, tube clamp and bolt, mother, oil, linen, electricity, gas welding rod, etc. Selection should be consistent with the design and construction specifications. <br> 5. operation technology < .br> A: process <br> B: installation preparation <br> (1), check carefully and be familiar with drawings, control engineering to stay trough hole and install to embedded parts. Find out about the technology and construction specifications, and strictly .implemented. <br> (2) according to design drawings to draw lines of location, size, and reserved port, coordinates, etc. <br> C: dry pipe installation <br> (1) according to sketch, construction of pipe manufacturing .prefabricated, check good size, press the loop block number stack neatly. <br> (2) install card holder, in accordance with the design requirements or require space installation, depending on the slope, in order to install. <br> (3 .) dry pipe installation from entering or branch road point, charging pipe before checking the lumen and clean, put the steel casing. <br> (4) tap valve from the tap point should not be too far away. Such as tap at the lowest .point, the system must tap valve with drain wire plug, high point vent installation. <br> (5) selected the pipe straightening, cleaned up lumen, welded pipe should be guaranteed after positive values. <br> (6) pipeline is installed ., check the coordinates, elevation, reserve population location and pipe-become the and so on are correct, and then find a straight, level tape, adjust the gradient proofing review, adjust the elevator bolts with type of card. Make its elasticity moderate, .flat, last welding firm fixed card at the stop plate. <br> (7) it is necessary to put or installed pipeline wear structure of casing, fill plug tube cave. <br> D: branch pipe installation <br> (1) .check the fan coil installation location and risers to leave holes is accurate. <br> (2) with a ruler, level tape, wire pendant proofing branch pipe slope peace leading wall dimensions and reviewing legislation and there is no fan coil. <br> .(3) the exposed threaded 2-3 buckle tube variable via the application variable administered hoop or welding. <br> E: fan-coil Setup <br> (1) the air blower plate tube should have factory certification specification or quality identification file .. <br> (2) the structure of the fan coil forms, installation forms, export orientation and feed location should meet the design requirements for installation. <br> (3) install location dimensions meet design requirements, the air conditioning system dry pipe .installed, to the fan coil pipe to keep spout location elevation to meet the requirements. <br> (4) process <br> A. air blower plate tube in the pre-installation check each motor shell and surface exchangers have no damage, corrosion ., and other defects. <br> B. air blower plate Tube, each test should be conducted power, mechanical part inspection, electrical part of leakage. <br> C. air blower plate tube should be individual hydraulic test, the test of strength .should be 1.5 times the working pressure, pressure after observation of 2-3 minutes are not permeable not leak. <br> D. horizontal lifting air blower plate Tube hanger flat solid, installed in the correct position, the boom should not swing freely, .suspenders and tray attached to the application as double-nut fastening leveling. <br> Cold and hot water pipes and media e. fan coil units, take over should be straight, condensate pipe used soft connection length no greater than 150 mm. Material use .transparent tube and hose clamps securing against leakage, the slope should correct, condensate should smooth stream to the specified location. The water plate should no ponding phenomenon. <br> F. fan coil pipe with hot and cold media connection should be in the pipeline .system flushing sewage and then connect to prevent clogging heat exchanger. <br> G. concealed in the ceiling fan-coil on the ceiling there active inspection door, easy to disassemble and repair unit as a whole. <br> (4) air conditioning .system debugging <br> 1, debug, the use of the instrument, the instrument should have the factory certification and accreditation, metrology law strictly, no more than printed or accredited appraisal cycle as well as the identification of measurement instrumentation shall be used. < .br> 2. the construction unit, overseeing company, construction company, suppliers (the device manufacturer) send debug Panel, comprising to debug unified management, according to the design of air conditioning parameters for debugging. <br> 3, there should be running .debugging scenarios. Before debugging a single test run the fan, equipment availability meet design requirements, the various parts in an open State location of the debugging process. <br> 4. debugging process program: <br> <br> 5. be familiar .with all the air conditioning system design information, including drawings and design specification, fully understanding the design intent and system in its entirety and device performance using method, also note mediation devices and instrumentation is located. <br> 6, in the process of debugging .is completed, the determination of system linkage operation integrated indicators meets the design and production process requirements. <br> Last for a long time the test run, constant accuracy is ± 0.1-0.2, in 24-36 hours. <br> Let all .the links of air-conditioning automatic control, etc., all input to assess the combined effect of the system. <br> 7, however, have prepared data sorting. debug report <br> 8. air conditioning system problems arising after the debugging .and solutions, see the following table: <br> Serial number problems cause analysis solutions <br> 1 the actual air flow too large system resistanceForce is small adjustable fan plate or valve, increase resistance <br> There is a problem with the fan speed .to reduce or replace the fan blower <br> 2 actual air flow too small system resistance put most of the large side segment size, improved some part, check the duct or device has no plug <br> There is a problem with the fan drive .belt tightening, improve fan or fan speed <br> Air leakage shutoff Yan flange joints, manholes, check valve or other existing leak <br> 3 the excessive speed of air flow too big air, air distribution is not reasonable to big air area, .reducing Tuyere air, change the type or with bezel, make the appropriate airflow <br> 4 noise exceeding the prescribed air blower, pump noise, air duct, the wind speed bias caused by partial part, muffler quality is not good to fan balancing, .fan and pump small earthquake; instead, the zoom speed fan speed oversize duct dimensions; improved local parts then duct to attach the noise elimination materials <br> <br> (5) hot and cold water pressure test media <br> Frozen water pipes .after installation, hydrostatic test should be carried out. <br> Pipe hydrostatic test steps: <br> 1, closed system, set aside the spout plug, branch pipe valve open. <br> 2. the system of irrigation. <br> .3, compression, the test pressure is the pressure to test 0.6Mpa after voltage 10 minutes, the pressure is not greater than 0.02Mpa is qualified. <br> 4. turn on the water, the pressure after the flushing. <br> ( .6) corrosion insulation <br> 1. all iron installation should remove surface rust layer (galvanized steel), the second road after brush antirust paint, exposed parts of the brush milk yellow Matt second road. <br> 2, chilled water and condensate .pipe insulation are blessed, rubber and plastic foam insulation thickness see design notes. <br> 3, duct insulation with gridlines foil veneer glass wool felt (surface adopts the moisture tension veneer), lap Office using tape seal. <br> 4, the .type of pipeline corrosion-resistant materials, the program should meet the design requirements. <br> 5 pipes insulation materials, fireproofing material conforms to the design and specifications. <br> 6, valves, flange and a few other removable parts for thermal insulation ., both sides must leave a void, then the same insulation filling. <br> 7. protective layer to help tie firm, tight, pressure seam evenly, beautiful. <br> Second, water supply and drainage construction technology measures <br> ( .A) of the drainage pipe installation <br> 1. all entry materials, equipment and products, should be consistent with national or MoE, the existing standards of technical quality sign the file or product certification. <br> 2. construction and various types .of work closely, while doing a quality inspection and assessment and construction records, ensure the quality of the project. <br> 3, pipeline installation, you must clear the inside dirt and debris, the installation is interrupted or completed stay the mouth should be .temporary closed. <br> 4. install piping support, cradles, the location should be correct, strict with conduit, fixed firmly. <br> 5, valve should be installed before the pressure strength test, the test should be in each batch ( .the same brand, same size, same model) 10 per cent of the number of sampling, and no less than one, if there is leakage, the crack is not qualified to sampling of 20 per cent, as there are no qualified you test one .by one. Installed in the trunk pipe on the closed valve shut-off function, one by one for strength and tightness test, the test pressure is the pressure of the valve factory provides. <br> 6. life in the cold and hot water .pipelines pipes, branch pipes adopt aluminum-plastic composite pipe, the rest are made of galvanized steel, threaded connection. <br> 7, drainage pipe: UPVC pipe drainage pipes, bonding interface. <br> 8, drainage pipes in each process is .completed, the reservation must be closed to prevent the spout sundries. <br> 9, drainage pipe installation has been completed, must be carried out according to the specifications for water testing. <br> 10, drainage pipe slope: DN50, I = .0.035; DN75, I = 0.025; DN100, I = 0.020. <br> 11, drainage pipe each layer set expansion joint, horizontal pipe every 2m set expansion joints 1. <br> (2) sanitary installation <br> 1, sanitary .sewer pipe diameter and minimum grade must be meet design requirements and specification requirements. <br> 2. sanitary water fittings tightly to intact, interface, flexible operation. <br> 3, sanitary installation to a smooth, accurate elevation plan position. <br .> 4. toilet must be pad mixed gray, surrounded by sand, cement mortar is strictly prohibited. <br> 5. sanitary and drainage pipe socket connector must not leak-tight. <br> 6, sanitary ware, to good corrosion protection bracket .laid flat and firm. <br> 7, sanitary ware after installation, you must do the water test, the time cannot be less than 24 hours, no leakage is qualified. <br> (3) branch, cradles of Ann <br> .1. pipe hangers with expansion bolts. <br> 2, hangers to reasonable structure, spacing within specification and design requirements. <br> 3. pipe hangers antiseptic to good, hangers installed before a preservative. <br> 4, hangers and close .contact with the pipe. <br> (4) corrosion resistance, insulation <br> 1. pipe branch, cradles in the surface cleaning of qualified before painting. <br> 2. domestic hot water and water-supply pipes shall be insulated, .insulation with polyethylene foam shell, flame retardant plastic wrap. <br> (5) the pipe flush and pressure testing <br> 1. water supply pipeline are required before the delivery, and then rinse. <br> 2, pipeline installation is finished ., do water pressure test. Test pressure, should be in the pipeline system working pressure 1.5 times, but no less than the pressure rises 0.6mpa provides pressure, pressure regulator for 10 minutes, shall not exceed 0.02mpa. <br> 3. drainage .pipe installation has been completed, should be closed water test will block the drainage outlet, filled with cold water, then filled with renewed for 5 minutes, the surface does not decline, not permeable not leak is qualified. <br> <br> < .br> <br>.