Design Principles for Commercial Kitchen Water Supply and Drainage

Kitchens have special technical needs. Design must follow the relevant codes and still adapt to site conditions, targeting safety, reliability, and practical performance. CHINENG outlines the guiding principles for kitchen water supply and drainage.

(1) Finalize the kitchen scheme early for smooth coordination

Whether new-build or renovation, flow rates, outlets, and pipe routes must follow the equipment layout. Owners should state requirements early so drainage design can follow. Most small restaurants reuse existing rooms and need capacity upgrades; late equipment layout causes redesign and rework.

(2) Professional design

Fit-outs often lack matching infrastructure. Rule-of-thumb work misses flow and pipe sizing. Have specialists calculate and design once. On new builds, kitchen layout should also be done early and signed off by kitchen managers for the architectural team.

(3) Detail every point

Match equipment outlets and clear other services. Detail to national and local codes, mark every point with technical notes, and ease construction. Calculate drain slope, interceptor depth, and inlet/outlet heights from the municipal invert and finished floor.

(4) Practical reliability

Raise materials where duty is harsh without wasting cost. A normal sink may use DN50 plastic waste, but kitchen wastewater carries grease and grit; heat-resistant DN75 pipe better resists grease blockage when hot-flushed.

(5) Leave spare capacity

Adding flow later is hard. Design margin for process changes, extra equipment, and competing water uses—spare outlets can serve as wash points in normal operation.

(6) Easy inspection and maintenance

Commercial kitchens are crowded and drains clog easily. Provide cleanouts at bends and crossings, and keep horizontal runs short.

(7) Human-centered design

Understand kitchen workflow and place sinks where staff actually need them for lasting convenience.

(8) Complete functions

Include open channels, grease interceptors, odor traps, and pest-proof pipe penetrations. Missing functions are hard to add later.

(9) Follow local rules

Meet building, environmental, and hygiene requirements; submit schemes early for review and acceptance.

In summary: these are CHINENG’s principles for commercial kitchen plumbing design. Follow the CHINENG website for ongoing updates.