【 Weak current College 】 plumbing and ventilation engineering quality (4)

<br> 5. heating pipe plug <br> <br> 1. construction preparation: <br> <br> (1) tubes shall be consistent with the design requirements, and the factory certification. The pipe may not be bent, rust .. Valve switch flexibly structured, straightness and angle is correct. Fittings for unbiased, side buckles, buckles, phenomena such as broken wires. <br> <br> (2) familiar with drawings, understand the forms of heating system and main device. .<br> <br> 2. operation process: <br> <br> (1) dry pipe installation <br> <br> 1) hot water heating entry should follow the design requirements set pressure gauges, thermometers, etc. <br .> <br> 2) heating dry pipe reducer bushing diameter shall not be used, should press exhaust requires the use of eccentric reducer. Adjustable position should not be greater than the branch point 300mm. <br> <br> 3) House indoor heating .dry pipe installation should not use live connector, such as design requirements must set the detachable connectors, flange connections should be used. <br> <br> 4) heating pipe welded steel pipe, connection diameter ≥ DN40, the use of welding, pipe .diameter "DN40 timely received by wire. <br> <br> 5) heating dry pipe ring road branching connection, consideration should be given to the pipeline expansion requirements, generally should not use the t-line pipe connection. <br> <br .> 6) making claw bending, traditionally prepared two 75 ° around the bend, at the junction of saw out Groove, head sawed duck lips, spelling should spot after, leveling and alignment, straight, then after welding. Claw of diameter bending interface must .be equal to the charge of diameter bending radius to diameter of 2.5 times. <br> <br> 7) dry pipe uses square tap, transverse spool for 3D + 100, vertical spool for 6D + 100. <br> <br> 8 .) dry pipe valve tapped off the tap point should not be too far away. Such as tap is the lowest point of the system, you must tap valve <br> <br> Before discharge wire plug. <br> <br> 9) .heating dry pipe peak or may have air concentration, should set an all-time low exhaust devices, or there may be water accumulation, electrical installations should be provided. Residential project of automatic discharge valve or gas tank should be installed in the kitchen and toilet .. <br> <br> 10) heating dry pipe slope General 0.003, but shall not be less than 0.002. <br> <br> 11) dry pipe bending and welding Department prohibited welding pipes, weld distance from bending interfaces, branch, .cradles the edge must be greater than 50mm. <br> <br> (2) vertical pipe installation <br> <br> 1) layout system risers, and buildings of use requirements, heating system schema, radiator placement of etc. You want .to save the tubing, easy to install and overhaul. Legislation in General is out. Standpipe Ming installed, should, as far as possible, the external wall corner and wall between Windows. Twin pipe system for water standpipe to layout on the right side of .the face; return water standpipe layout on the left side of the face, two vertical spacing to 80mm Center. <br> <br> 2) heating risers and transverse dry pipe connections, such as risers line length is less than 15m, risers and .dry pipe available second elbow connection, riser lines longer than 15m, risers and dry pipe three 90 ° elbow and dry pipe connection, <br> Transverse section length should be, and should have 1 300mm% slope, should not be used outside the wire .and the elbow joint instead of pipe cross section as a connection method to ensure that the riser to compensate for shrinkage and expansion. <br> <br> 3) residential project single sequential hot water heating system closed pipe risers valve can not install live connector ., a closed tube of standpipe valve should be set live connector, but closed pipe can not live connector. <br> <br> 4) closed the exact dimensions of the pipe to radiator inlet and outlet Centre spacing, combined with the heat sink, .the following branch pipe slope value is closed pipe specific dimensions. <br> <br> 5) heating risers must after straightening before installation. Straightening is gas welding of partial heating straightening. <br> <br> 6) riser before installation, you .should place the heat sink, find good flatness, you can install riser. This riser sizes can accurately. <br> <br> 7) double vertical tube bending of the semicircle should accurately and precisely, pipes in the middle of the semi-circular .curved. Can not be wrong, or wrong. <br> <br> (3) branch pipe installation <br> <br> 1) branch of the light-bending ellipse rate should break. Pipe diameter not less than or equal to the .allowed deviation 100mm, 10/100; diameter is larger than the allowed deviation 100mm, 8 / 100. <br> <br> 2) concealed or Penumbra of radiator tube lights fork bending must adapt to the heat sink grooves corner, to achieve a .more elegant. <br> <br> 3) connect the radiator pipes should slope. When the branch pipe length less than or equal to 500mm, gradient values greater than 5 mm; 500mm 10 mm. For the next time the supply tube slope to .the radiator, backwater branch pipe slope to the risers. For the next double tube on the top floor water standpipe no exhaust device for, backwater branch pipe slope to the risers, other layers of the water supply pipe slope to the radiator, backwater branch pipe .slope to the risers. <br> <br> 4) radiator tube length greater than 1.5m, should in the middle of the installation of the card or the Thomas hook. <br> <br> 5) radiator pipes over the wall, .except it should be added to the casing should note the pipes have not allowed inside a wall joints. Install the valve on the pipe, near the radiator side should connect with removable parts. Radiator pipes installed, should sink and riser after installation is complete, .you can also simultaneously with the risers to install. Installation make sure that the tube adjustment suitable for the meet, so as not to get twisted branches and risers. <br> <br> (4) heat sink installation. Radiator models, specifications, .use pressure must meet the design requirements, and the factory certification. Radiators quality meet the requirements of the product. Heatsink Assembly, should Nedlloyd and other debris inside. And brush on the antirust paint and silver powder all over again. Radiator Group on hydraulic test .should be done. Production radiator to the hydraulic test should be done on site. Section adopted the radiator la _8-_10 of round bar and straightening, derusting shuaqi, radiator and the two pull, pull threads exposure shall not exceed a nut thickness.The .inner surface of the radiator and wall distance 25 ~ 40mm. Radiator Center and window Center on positive, thermal installation should be normal. Column-type floor heatsink card installed: sub sank tablets (monolithic refers to the number of the heatsink is singular, double .piece refers to the number for the radiator in the area), single-chip clamp installation time from the center line can move left and right, double piece clamp 30mm installed on the centre line. Installation height, from the ground to heat sink total height .of 3 / 4. 15 tablets following planting 1 fixed cards, 16 pieces should be planted 2 fixed card, each end from radiator in 4-6 tablets in the local culture. Heatsink on RI column, two pieces of plywood shear over flat is tightened .. Round type radiators installed horizontally, its vertical longitudinal wings should be installed. Steel closed series chip and steel plate radiator hanging in the retention mechanisms, must be flat and firm. <br> <br> 3. preventive measures: <br> < .br> (1) pipe bending sand, must seriously clearing tube bore. <br> <br> (2) pipe saw percentage, tube fly thorn should be clean. <br> <br> (3) cast iron radiators group, it .should be noted that the legacy of clean sand. <br> <br> (4) installation of pipelines, should promptly used temporary plug to plug up the spout. <br> <br> (5) the use of pipes, you must .be a knock on second look, tube patency. <br> <br> (6) the pipe vapor when falls into the pipe welding openings in the scoria. <br> <br> (7) pipeline full after installation, you should press .the specification requirement first clean again and outside line connection. <br> <br> 6. rectangular duct diagonal lines are not equal <br> <br> 1. construction preparation: making wind pipe material should have a factory-qualified certificate or qualification .documents. Plate thickness should be consistent with the provisions of the construction acceptance. <br> <br> 2. operation process: rectangular duct production process: Lofting marking, cutting, chamfering, bite, duct bend side, forming, riveting flange, flange ., painting, inspection, factory. <br> <br> 3. preventive measures: <br> <br> (1) materials for party crossed, test each piece width, length and size of the diagonal, the scope beyond the error should .be corrected by sizes. <br> <br> (2) the following material after duct counterface two pieces of heavy match, verify the accuracy of its size. <br> <br> (3) actions should ensure that bite width. For .different ports, handmade bite width may refer to the relevant provisions. <br> <br> (4) handmade bite, first fixed at both ends and Center, and then even bite. <br> <br> 7. round elbow, three .links point to <br> <br> 1. construction preparation: making wind pipe material should have a factory-qualified certificate or qualification documents. Plate thickness should be consistent with the provisions of the construction acceptance. <br> <br> 2. .operation process: rectangular duct production process: Lofting marking, cutting, chamfering, bite, duct bend side, forming, riveting flange, flange, painting, inspection, factory. <br> <br> 3. preventive measures: <br> <br .> (1) ensure the setting-out accurate. <br> <br> (2) the flap and double mouth width should be consistent. <br> <br> VIII. Circular no LAN connection is not strict air duct <br> .<br> 1. construction preparation: <br> <br> (1) various installation materials should have factory certificate or qualification documents and product listings. <br> <br> (2) air duct is finished do not distort, warp, .crack or hole, flanges, flange welding, riveting, leak leakage play Lo <br> <br> Suppository eye defects. <br> <br> (3) the installation of the valve body, muffler, hood, diffusers, and other parts .should check the adjusting device is flexible, noise control, paint layer has no injury. <br> <br> (4) installation of materials: bolts, nuts, washers, litter, self-tapping screws, rivets, rivets, welding electrodes, .wire, stainless steel wire, asbestos fabric, canvas, air, expansion bolts, etc., should be consistent with the product quality requirements. <br> <br> 2. operation process: duct installation process: determine elevation, install hanger, wind .pipe arrangement, installation-leveling alignment and inspection. Duct and hanger contact should pad into the thickness is 3 ~ 5 mm Plastic gasket and glue for bonding. Bracket to hold production should remain with air duct with some gaps, easy wind pipe expansion. The .flange should have litter to ensure tight flange interface. <br> <br> 3. preventive measures: press duct section size of size, using different forms cannot be LAN interface. Wind pipe not LAN interface, called wind pipe interface moved edge width dimensions .equal. <br> <br> <br> <br> <br>.