Beijing "Construction Consumption Standard" DB11/T 2382-2024 - method of applying water-supply-and-drainage plastic-pipe sub-items banded by "nominal diameter (mm inclusive)": convert the de value on the drawings to DN before selecting the band (de110 -> DN100 band)

Topic Positioning

Beijing pricing basis: in Appendix C (general installation works) of the "Construction Consumption Standard" DB11/T 2382-2024, the water-supply-and-drainage plastic-pipe sub-items are banded by "nominal diameter (mm inclusive)"; this card gives the method of matching the de (dn) values marked on the drawings to the quota bands.

Core Conclusions

• Banding basis: the plastic-pipe sub-item names are banded by "nominal diameter (mm inclusive)" (e.g. "nominal diameter (mm inclusive) 100"), i.e. the band is selected by DN, not directly by the de value on the drawings.
• Indoor polypropylene silent drainage pipe (socket flexible jointing, Table C.10.17-3): sub-item C10-2-115, nominal diameter within 100 mm; accompanying materials include rubber ring DN100, plastic pipe clip 100, ball bladder 100 - a silent drainage pipe marked de110 on the drawings is applied under this band (de110 corresponds to DN100).
• Outdoor drainage plastic pipe (fusion jointing, Table C.10.5-1): sub-item C10-1-65, nominal diameter within 100 mm; accompanying materials include fusion-joint drainage-pipe coupling DN100 and ball bladder 100; fitting material quantities are calculated by the numbers shown on the design.
• Application essentials: first convert the de value on the drawings to nominal diameter per the DN-de correspondence, then select the "nominal diameter (mm inclusive)" band; de110 corresponds to the DN100 band - do not shift to the next higher band merely because de110 > 100.

Applicable Boundaries

• Applicable only to the pricing basis of Beijing DB11/T 2382-2024; the banding rules of other regions' consumption/quota standards are governed by their own chapter notes.
• The coverage of each band (band upper limit) follows the quota chapter notes and the "DN-to-product-size comparison table" given in the design documents.
• The de-to-DN correspondence is the common engineering mapping (de110 <-> DN100, de160 <-> DN150); verify against the design basis before use; sub-item consumptions (labor, materials, tools) follow the original text of the standard.

Further Reading

• DB11/T 2382-2024 Appendix C, general installation works: Table C.10.17-3 (polypropylene silent drainage pipe, socket flexible jointing) sub-item C10-2-115; Table C.10.5-1 (outdoor drainage plastic pipe, fusion jointing) sub-item C10-1-65.
• Basis of the diameter conversion: GB/T 50106-2010 "Standard for Water Supply and Drainage Drawings of Buildings", Clause 2.4.2 (plastic pipes are designated by nominal outside diameter dn; where DN is used, a DN-to-product-size comparison table shall be provided); CJJ/T 29-2010 "Technical Specification for Building Drainage Plastic Pipelines", Section 2.1.