【 Weak current College 】 plumbing and ventilation engineering quality (3)

3. heating dry pipe laying estuary allowed

1. construction preparation:

(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.

(2) familiar with drawings, understand the forms of heating system and main device.

2. operation process:

Dry pipe installation

(1) heating entry should be the design requirements set pressure gauge, thermometer, and other devices.

(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.

(3) of the residential project of indoor heating dry pipe installation should not use live connector, such as design requirements must set the detachable connectors, flange connections should be used.

(4) heating pipe welded steel pipe, connection diameter ≥ DN40, the use of welding, pipe diameter "DN40 timely received by wire.

(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.

(6) the production of curved claw, stewed 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.

(7) main pipe uses square tap, transverse spool for 3D + 100, vertical spool for 6D + 100.

(8) of the 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 with drain wire plug.

(9) the highest point of heating dry pipeor 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.

(10) heating dry pipe slope General 0.003, but shall not be less than 0.002.

(11) dry tube bending parts and weld welded pipes is strictly prohibited, interface from bending point welding seam distance, branch, cradles the edge must be greater than 50mm.

3. preventive measures:

(1) dry pipe risers shed mouth size should be in the field of steel tape measure actual measurement.

(2) the types of work are common in strict accordance with the design of wall construction, unify allows the axis.

4. heating pipe risers are not allowed to dump mouth

1. construction preparation:

(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.

(2) familiar with drawings, understand the forms of heating system and main device.

2. operation process:

(1) vertical pipe installation

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.

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,
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.

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.

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.

5) heating risers must after straightening before installation. Straightening is gas welding of partial heating straightening.

6) riser before installation, you should place the heat sink, find good flatness, you can install riser. This riser sizes can accurately.

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.

(2) branch pipe installation

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.

2) concealed or Penumbra of radiator tube lights fork bending must adapt to the heat sink grooves corner, to achieve a more elegant.

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 theradiator, backwater branch pipe slope to the risers.

4) radiator tube length greater than 1.5m, should in the middle of the installation of the card or the Thomas hook.

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.

3. preventive measures:

(1) measurement of vertical pipes dimensions, General record.

(2) the standpipe of the pipes will open to fit the branch pipe slope requirements. General branch pipe slope 1%.

(3) the radiator should try to use mount to reduce ground construction elevation deviation.

(4) ground construction should strictly follow the base line, ensure the deviation does not exceed the scope of the heat sink is installed.