Ventilation pipe processing scheme
All materials must be declared before construction and can be constructed after examination and approval.
The materials used are factory certificate, quality sign document and instruction manual.
The valve and tuyere should be checked whether the adjusting device is flexible and whether the paint is damaged or not. 通风管道加工
Main machine tools
Small tools such as folding machine, bite machine, hammer, electric hammer, electric drill, electric welding machine, wrench and so on.
The work of this project is carried out by pipelining.
Wind pipe making
Metal ducts are made of steel plates, flanges are made of profiled steel. When prefabricating, attention should be paid to the use of wrong materials. A section should be left at the connection of variable diameter accessories (such as tuyeres etc.) and then be made and installed according to the actual size. Avoid rework, flange production should be carried out in pairs, to avoid future installation bolt hole alignment.
According to the size of the duct, choose different thickness of the board, then leave enough allowance for the blanking.
The method of marking should be strict, so that the angle is straight, the line is even, the equal part is accurate, and the combined size is often checked, so as to achieve the goal of strict circle crossing and correct size.
Cut and chamfer should be correct, minimize error, avoid overlap between joints and flanges.
Try to use bite connections when making air pipes and components, because the seam can increase the strength of the duct.
Choose the width and quantity of bite according to the different thickness of plate. When bite is operated, avoid false bite, cause crack and half bite.
When the side length of air duct is too long and the pipe section is over 1.2 meters, reinforcement measures should be adopted, such as angle steel frame reinforcement, angle steel reinforcement of large side, and internal wall reinforcement ribs. 通风管道加工
Flange is welded with angle steel flange group. When cutting, it is processed by the section steel cutting machine. After drilling on the drilling machine, it is welded on the welding platform to ensure the flatness.
During the prefabrication, the adjacent air pipes are numbered to increase efficiency and reduce rework during construction.
The specifications and dimensions of the air duct should meet the design requirements. When the appearance quality reaches a straight angle, uniform arc, two ends parallel, no warping angle, air duct and flange connection firmly flanged flat and close to the flange. The reinforcement of the wind pipe is firm and orderly, and the spacing is suitable and symmetrical.
Before installing the wind pipe, the obstacles are cleared up and the construction is carried out under the condition of no sundries on the ground.
Check the location and dimension of the pre-reserved holes in the site structure to meet the requirements of the drawings. If there is any omission, the remaining holes should be larger than 100MM on each side of the duct.
The place of operation should be provided by corresponding auxiliary facilities, such as ladder power supply, fire protection equipment and so on.
Installation of duct and components
Determine the elevation, make the hanger, air pipe support hanger manufacture and installation according to the "Heating and Ventilation Design Selection Manual"
The wind pipe supports and hangers conform to the design and regulation requirements.
Hanger spacing 通风管道加工
The diameter of circular or rectangular ducts is less than 400 mm, the distance between horizontal ducts is less than 4 M, the distance between vertical ducts is less than 4 M, and the minimum number of hangers is 2.
The horizontal air duct spacing of round or rectangular air duct diameter > 400 mm < 1000 mm is not more than 3 M, the vertical air duct spacing is not more than 3.5 M, and the minimum number of hangers is 2 pairs.
Circular or rectangular duct diameter or rectangular duct long side size > 1000mm horizontal duct spacing is not more than 2M, vertical duct spacing is not more than 2M, the minimum number of hangers 2;
The support hanger shall not be installed at the tuyere, valve, inspection hole, etc. to avoid hindering operation, and the hanger shall not be directly suspended in France.
The support and hanger device of the heat preservation air pipe should be placed outside the heat preservation layer, but the heat preservation layer should not be damaged, and the heat preservation air pipe can not be directly contacted with the support and hanger bracket.通风管道加工
In order to ensure the tightness of flange joints, there are padding between flanges and 8501 sealing tapes. Asbestos and rubber sheets are used for the exhaust pipe.
Flange connection method: the nut should be on the same side. If the flange is damaged, it should be replaced in time.
A fixed point to prevent swing should be installed in the suspended duct and components.
The flange should not be inside the wall when the duct is installed. It should be 150MM above the wall. It is convenient for operation, maintenance and modification.
The hanger rod of the air duct is made of round steel below 630MM, round steel below 1200MM and round steel above 1200MM with 12MM. 通风管道加工
Mufflers and fire-proof valves should be installed separately with support and hangers to prevent the air duct from bearing its weight. The installation direction must be correctly connected with the flange of the air duct or fittings to ensure tight and firm.
Heat insulation of wind pipe
The insulation material should be cut correctly, the cutting surface should be even, and the horizontal and vertical surfaces should be overlapped at the top of the short side on the large surface.
Before bonding the heat preservation nail, the dust and oil on the air duct should be wiped clean, and the adhesive should be applied on the pipe wall and the bonding surface of the heat preservation nail respectively, and then bonded on it later. 通风管道加工
After holding the heat retaining nails, they should be laid on the horizontal surface after 12~24 hours.
Wind pipes through walls and floors
The wind pipe is filled with rock wool in the middle of the wind pipe and the wall when passing through the wall and passing through the floor. 通风管道加工