Do you know the common calculation methods used in the design of duct and pipe components? In fact, it may not be easy for amateurs to understand, but it is still recommended that you learn more before use. The following is the answer from Shandong ventilation pipe manufacturer:
The air duct installation shall be calculated based on the "area" of different specifications in the construction drawing, excluding the area occupied by inspection holes, measuring holes, air supply outlets, suction outlets, etc.
When calculating the length of the air duct, the length of the center line in the construction drawing shall prevail (the main pipe and the branch pipe shall be divided by the intersection of the center line), including the length of the elbow, tee, reducing pipe, the radius of the sky and other pipe fittings, but not including the length of canvas, air valve, muffler, and equipment. The diameter and perimeter shall be expanded according to the dimensions shown in the figure.
The quota includes loss when quoting, and the calculation result does not need to be multiplied by loss factor.
Thin steel plate ventilation duct, purification ventilation duct, composite air duct (fiberglass board, incombustible inorganic composite air duct), flanges, reinforcement frame and lifting bracket have been included in the quotation quota, and are not calculated separately. However, it does not include the over-span air duct floor support, so the weight of the over-span air duct floor support shall be calculated according to the drawing and specifications.
For stainless steel ventilation pipes and aluminum plate ventilation pipes, the quotation quota in the air duct seaming connection includes pipe fittings and flanges, but does not include lifting brackets. The quotation quota in the welding connection only includes pipe fittings, but does not include flanges and lifting brackets. The work quantity is measured in "kg". Therefore, the weight of flanges and lifting brackets is calculated according to the air duct connection method and the design instructions or specifications.
Refer to the settlement data of the constructed project: the content of flange (stainless steel angle iron 3 #) is estimated to be 0.9kg/m2; The content of lifting bracket (stainless steel angle iron 4 #, stainless steel channel steel 6 #) is estimated to be 1.5kg/m2; If there are similar projects in other projects, please provide data timely for correction.
Flexible connection of air duct:
(1) The canvas interface is calculated in "square meters" according to the size shown in the figure, and the general width is 250mm, which is based on the site production experience;
(2) The hose duct is calculated in "m" according to the drawing size.
For the guide vane of air duct, calculate the number of elbows according to the specification of air duct, and calculate the "area" of guide vane according to the following table.
The unit of measurement is "piece" (calculated as finished product) according to different types (fire damper, butterfly valve, split multi-leaf valve, diffuser, louver, etc.) and different specifications.
Silencer, silencing static pressure box and static pressure box shall be measured by "set" (calculated by finished product) according to different specifications, and shall be calculated by "square meter" (six surface areas) except for the design requirements.
The insect-proof net is calculated in "pieces" or "square meters", and the pricing personnel can convert it according to their needs.
If the design specification requires air duct inspection hole and air duct measuring hole, the inspection hole shall be converted according to the following table and calculated by weight, and the measuring hole shall be measured in "piece" according to its model.
When the wall casing adopts 2mm thick steel plate or other thickness (according to the design drawing), it is calculated by "area".
We have learned about the commonly used calculation methods in the design of air duct and pipe components. We hope that the ten key points can give you some information. For more matters, please come to consult us http://www.jntfgd.com ！