Beijing DB11/T 2382-2024 quota application for cooling-tower installation: Table C.7.11 banded by treated water flow, the applicability basis for closed-circuit towers and the multi-motor coefficient

Topic Positioning

Quota application and quantity-calculation rules for cooling-tower installation within the general installation works of Beijing DB11/T 2382-2024 "Construction Consumption Standard": covering the applicability basis for closed-circuit cooling towers, the coefficient treatment for "one tower with multiple motors", and the cost boundary of on-site assembly.

Core Conclusions

1. Sub-item to apply: cooling-tower installation executes "Table C.7.11 cooling-tower installation" of Appendix C (general installation works) of the standard; sub-items are banded by the equipment's treated water flow, all measured per "unit". Verified band examples: C7-1-166 (treated flow within 100 m3/h, comprehensive labor Category II 15.4320 work-days/unit), C7-1-171 (treated flow within 700 m3/h, comprehensive labor Category II 35.7140 work-days/unit); the intermediate sub-item numbers are to be verified against the text of the standard.
2. Quantity rule (Clause 6.7.23): "Cooling-tower installation quantities shall be classified by the tower's own cooling-water flow and calculated by the numbers shown on the design."
3. Closed-circuit towers: Table C.7.11 bands sub-items by treated water flow and does not separate open/closed-circuit sub-items; closed-circuit cooling towers likewise execute this table, selecting the band by the tower's own cooling-water flow (the product's rated treated flow).
4. One tower with multiple motors (multi-fan / multi-drive) - Table C.7.11 work content, item 2: "Where one cooling tower is fitted with multiple motors, the corresponding item shall be executed by the total cooling-water flow, and the labor and tool consumptions multiplied by 1.1."
5. Cost boundary - the work content is "handling within the site, assisting equipment-foundation acceptance, unpacking, inspection, positioning, leveling, aligning, welding, fixing, grouting, cleaning, trial operation", with the note "excludes on-site assembly; anchor bolts are considered supplied with the equipment". Where multiple cells (units) combine into one integral tower, the on-site assembly/erection cost is not within the installation sub-item and must be considered separately per the equipment supply scope and the construction scheme; equipment-foundation concreting follows the corresponding civil items.
6. Supports/underlay supplied with the equipment: Clause 6.7.5 - "The construction consumptions of ventilation and air-conditioning equipment installation shall include the installation of the equipment supports or bottom underlay supplied with the equipment."
7. Equipment cost: the sub-item consumptions include only labor, auxiliary materials and tools; the cooling-tower body (equipment cost) is charged separately at compilation-period prices.

Applicable Boundaries

• Applies to Beijing-area projects compiled under DB11/T 2382-2024; other provinces/cities execute their local consumption (budget) quotas.
• The banding key is "the tower's own cooling-water flow", not the system's total circulating flow or the tower group's total treated flow; the connecting piping and electrical wiring are not within this table.
• Applies only to complete-unit towers delivered without on-site assembly; on-site assembly content is not in the sub-item.
• Where the installation height exceeds 6 m, the labor efficiency reduction follows Clause 6.7.2 referring to Clause 6.1.2.

Further Reading

• DB11/T 2382-2024 "Construction Consumption Standard", Appendix C general installation works, Table C.7.11 "cooling-tower installation" - sub-items by treated-flow band (from C7-1-166, unit: unit).
• Body text 6.7 ventilation and air-conditioning installation works: Clause 6.7.2 (labor reduction above 6 m), Clause 6.7.5 (scope of support/underlay installation), Clause 6.7.23 (quantity calculation).
• Pricing companion: the cooling-tower equipment price is taken from compilation-period price information or market inquiry.