Applying quota items to socket solvent-cement jointing of UPVC water and drainage pipes under Beijing DB11/T 2382-2024, and judging the fittings content: take the "(solvent cement)" series, never the fusion series; match indoor / outdoor tables and diameter bands; fittings take no separate installation item; material quantities per the design-shown numbers or the fittings reference tables

Topic Positioning

Under Beijing DB11/T 2382-2024 Construction Works Consumption Quota Standard (section 6.10 water supply, drainage, heating and gas works): how to apply quota items to solvent-cement socket jointing of UPVC (unplasticised PVC) plastic water and drainage pipes, and the rules for judging the fittings content. For cost engineers selecting items and checking fittings quantities on water and drainage work.

Core Conclusions

1. Table-selection principle: match on "system x location x jointing method x diameter"; the "solvent" and "fusion" series must never be mixed

• UPVC socket solvent-cement jointing takes the "(solvent cement)" series; HDPE, PP-R and other fusion pipes take the "fusion connection" series; the two must not be cross-applied; electrofusion follows the fusion items.
• Quick reference of common items (item unit: m):
  • Indoor water supply plastic pipe (solvent cement), table C.10.15-1: DN15 -> C10-2-65, DN50 -> C10-2-70, DN100 -> C10-2-73
  • Indoor drainage plastic pipe (solvent cement), table C.10.17-1: DN50/75/100 -> C10-2-99/100/101, DN125 -> C10-2-102
  • Outdoor water supply plastic pipe (solvent cement), table C.10.4-2: DN50 -> C10-1-56, DN200 -> C10-1-62
  • Outdoor drainage plastic pipe (solvent cement), table C.10.5-2: DN100 -> C10-1-74
  • Indoor AC condensate plastic pipe (solvent cement), table C.10.16: DN50 -> C10-2-98 (never mixed with the supply / drainage tables)
• Technical basis for the jointing method: CJJ/T 29-2010 clause 4.1.2 (PVC-U drainage pipes shall use solvent-cement socket joints); CJJ/T 98-2014 clause 4.1.8 (for PVC-U pipes laid indoors with diameter not over 110 mm, pipes and fittings shall be solvent-cement jointed).

2. Judging the fittings content

• Per clause 6.10.32: pipe installation quantities are computed by length on the design-shown pipe centreline, without deducting the lengths occupied by fittings, valves and accessories; pipe installation consumption shall include the fitting installation content - that is, fittings take no separate "fitting installation" item.
• Fitting material quantities are computed per the design-shown numbers, or per the fittings reference tables 6.10.32 (indoor) / 6.10.23 (outdoor); some items expressly note computation per the design-shown numbers (e.g. outdoor drainage plastic pipe, solvent cement, C10-1-74, work content: fitting material quantity shall be computed per the design-shown numbers).
• The "plastic fittings" content inside the items equals the reference-table subtotals, enabling reverse checking: C10-2-70 (DN50) fittings 0.724 No./m = table 6.10.32-7 DN50 subtotal 0.724; C10-2-73 (DN100) 0.398 = table 6.10.32-7 DN100 subtotal 0.398; C10-2-102 (DN125) 0.961 = table 6.10.32-11 DN125 subtotal 0.961.
• Reference-table subtotal comparison (No./m):
  • Indoor supply, solvent -> table 6.10.32-7: DN15 1.550, DN50 0.724, DN100 0.398, DN200 0.301
  • Indoor drainage, solvent -> table 6.10.32-11: DN50 0.942, DN75 1.158, DN100 1.324, DN125 0.961
  • Indoor AC condensate -> table 6.10.32-10: DN50 0.402, DN75 0.580
  • Outdoor supply plastic pipe (fusion / electrofusion, solvent) -> tables 6.10.23-2 / 23-3; outdoor galvanised steel pipe, welded steel pipe and steel-plastic composite supply pipe (threaded) -> table 6.10.23-1; outdoor welded / seamless steel pipe (welded) -> table 6.10.23-8

3. Error-prevention points

1. The fusion and solvent code bands are adjacent; UPVC must not be fusion jointed and the bands must not be mixed.
2. In the electronic compiled edition, the "owning table" column of C10-2-99/100/101 is prone to misalignment with the adjacent table C.10.16 (indoor AC condensate); before applying, double-check via the work content (including straightening, pipe-clip fixing, temporary sealing, water-fill test) and the fittings content (0.942 / 1.158 / 1.324 matching table 6.10.32-11), then execute as "drainage plastic pipe (solvent cement)".
3. Indoor rainwater pipes follow the indoor water supply pipes with labour x 0.90; siphonic rainwater pipes follow the indoor water supply pipes (clause 6.10.27).
4. Flexible / gasket joints form another series and must not be cross-applied with solvent joints.

Applicability Boundaries

• Applies only to projects priced under DB11/T 2382-2024 within the Beijing municipality; other provinces and cities have different consumption / quota item codes which must not be copied directly.
• Applies only to solvent-cement socket jointing of unplasticised PVC (PVC-U / UPVC); HDPE / PP-R fusion and PE electrofusion are outside this series and must not be mixed merely for being "plastic pipe".
• "Per the design-shown numbers" and "per the reference table" are two positions for fitting material quantity, not to be stacked; follow the note in each item's work content.
• "Without deducting the lengths fittings occupy" is a quantity-measurement position; fitting installation is already included in the pipe item - both conclusions say fittings are not separately charged for installation.

Further Reading

• DB11/T 2382-2024 Construction Works Consumption Quota Standard, section 6.10 and Annex C general building services works: tables C.10.15-1 (indoor water supply plastic pipe, solvent), C.10.17-1 (indoor drainage plastic pipe, solvent, with continuation), C.10.4-2 (outdoor water supply plastic pipe, solvent), C.10.5-2 (outdoor drainage plastic pipe, solvent), C.10.16 (indoor AC condensate plastic pipe, solvent); fittings reference tables 6.10.32-1 to 15 (indoor) and 6.10.23-1 to 8 (outdoor), all in "No./m".
• CJJ/T 29-2010 clause 4.1.2 and CJJ/T 98-2014 clause 4.1.8: the basis for selecting solvent-cement socket jointing of plastic pipes.