During the cost estimation process, contractors often need to determine the volume of ductwork to calculate material costs. However, the finished area does not always reflect the total amount of material actually needed.
Understanding how quantities are formed helps the QS and purchasing departments compare quotations between suppliers.
1. Factors affecting volume
The basic mass depends on:
- Pipe size.
- Length.
- Quantity.
- Thickness.
- Cross-sectional shape.
- Accessory.
- The seam edge.
- Reinforcement.
- Loss.
2. What should be considered when using rectangular tubes?
For a rectangular pipe, the basic surface area can be calculated by multiplying the perimeter of the cross-section by its length.
However, when converting to actual material quantities, additional costs for processing and structural connections according to the production plan must be considered.
3. Why might the two quotes be different?
| Element | Impact on price quotations |
|---|---|
| Thickness | Amount of material |
| Type of roofing sheet | Raw material prices |
| flange/trim | Accessory costs |
| Reinforcement | Material requirements |
| Loss | Production costs |
| Quantity | Production efficiency |
| Transport | Logistics costs |
4. QS should not only compare prices per square meter.
A low quoted price doesn't necessarily mean a low total cost.
Please check if the quoted price includes:
- Straight pipe.
- Coil/butter.
- Numb.
- Change the cross-section.
- Flange/trim.
- Valve.
- Accessory.
- Transport.
- Technical documentation.
5. Sao Viet Air Ducting supports data from drawings.
For large-scale projects, contractors should submit complete drawings or Bill of Quantities (BOQ) to Sao Viet Air Duct This allows for a thorough assessment of the scope of supply and the creation of realistic price quotations.
This also helps to limit misunderstandings between the two parties regarding the scope of work.
Conclusion
Calculating the volume of ductwork is not only useful for quotations but also helps contractors control materials, project timelines, and costs.
A good quote is one that includes Clear scope, clear specifications, and transparent terms of supply..
SAO VIET AIR DUCT MANUFACTURING AND TRADING COMPANY LIMITED
- Address: 267 Le Thanh Tong, May Chai, Ngo Quyen, Hai Phong
- Hotline: 0815.999.826 – 0934.559.168
- E-mail: vietonggio@gmail.com
Sao Viet Air Duct We undertake fabrication and supply of ductwork and HVAC accessories according to project drawings and technical requirements. M&E/Fire Protection contractors can submit their orders. drawings, BOQ, or technical specifications To receive advice on suitable options and a price quote.
