【 Weak current College 】 ventilation and air conditioning: engineering installation on common quality problems

Ventilation air conditioning engineering quality not only depends on the level of design and equipment performance, but also on the quality of installation, its relationship to the project production efficiency and economic benefits of play. In recent years, ventilation, air conditioning engineering development faster, some construction units will work subcontracted to not have conditions of construction, construction personnel Setup unit without professional training blind for posts, works a lot in common, resulting in poor quality is not up to the expected use of features and effects that make it subject to undue loss. To eliminate the danger of the construction and technical staff and project supervisor should carefully follow the application process for the method of construction and technical supervision, so that the project reaches the construction and acceptance of, and the quality inspection and assessment standards requirements.

1 manufacture and installation of air duct

1.1 sheet steel rectangular duct of stiffness is not enough

1.1.1 manifestations on the edge of the large wind pipe with varying degrees of sinking, the two side small edge is slightly outward, visible distortion.

1.1.2 harmful system operation, wind pipe surface fibrillation generate noise, resulting in noise pollution, reduce wind tube life.

Analysis of the causes of 1.1.3

① windpipe of plate thickness does not meet the construction and acceptance;

② bite form select inappropriate;

③ not in accordance with the construction and acceptance of requirements for side length ≥ 630mm or insulation air pipe ≥ 800mm, its length is more than 1200mm, strengthening measures should be taken.

1.2 sheet steel rectangular duct distortions, Alice Kok

1.2.1 manifestations wind pipe surface uneven; diagonal lines are not equal; adjacent surface non-vertical; two relative surface is not parallel and two tubes are not parallel to the plane.

1.2.2 damage duct produces distortions, Alice Kok phenomena, makes the wind pipe and duct connections are not affected by force, not tight flange gasket, increase the amount of air leakage; at the same time air duct system is not up to the construction and acceptance of flat, affect its appearance and reduce the service life.

Analysis of the causes of 1.2.3

① rectangle sheet metal cutting, not on the four corners of the rigorous measurement of angular side;

② air duct of big edge or small edges of two opposing side of the sheet metal is not equal to the length and width;

③ duct of the four corners of the bite does not equal the width;

④ handmade bite force stitching.

1.3 sheet steel rectangular elbow angle not accurate

1.3.1 manifestations elbows surface uneven, tube diagonal lines are not equal, the bite is not strict.

1.3.2 harmful influences and elbow connection of pipes and a draught of coordinates, and increase the amount of air leakage.

1.3.3 analysis

① elbow side walls, elbows bent back and the head of the slice size not accurate;

② two large material not strictly angular side;

③ elbow back and bend head of radian inaccurate;

④ as manual joint angle-Pittsburgh, Pittsburgh area width is not equal.

1.4 circular duct different heart

1.4.1 manifestations duct is not straight, two port surface uneven, pipe diameter smaller.

1.4.2 damage to connect after duct, its horizontal and vertical to the construction and acceptance of, and influence the duct system.

1.4.3 an analysis of the causes of

① production with diameter circular air ducts, cutting angle side right angle is not accurate;

② make reducing is heart circle duct, expand the following material is not accurate;

③ bite width is not equal.

1.5 round elbow angle not accurate

1.5.1 manifestations elbow angle line offset, diameter and shape of contorted, etc.

1.5.2 hazardous elbow and other parts and accessories for the connection, the influencing its coordinates accuracy and lead pipes system contorted, and other ills.

Analysis of the causes of 1.5.3

① expand dash inaccurate;

② Bend bite tightness;

③ elbow mount when sections of the corresponding expanded line of misalignment.

④ elbow adopts single bite, sections of single and double bit width of the mouth are not equal, the angle of the elbow is not accurate, bend bite loose or cracking the funds.