Acceptance inspection content and testing items for the hotel water supply and drainage system

Acceptance inspection content and testing items for the hotel water supply and drainage system

I am Daniel Wang, a water supply and drainage specialist. The completion acceptance of a hotel's water supply and drainage system is a critical step in ensuring the system operates safely, reliably, and efficiently. This is especially true for hotels—high-standard venues with heavy foot traffic—where any oversight can lead to operational disruption or guest complaints. The following is detailed content based on GB 50242-2002 "Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering," GB 50015-2019 "Standard for Design of Building Water Supply and Drainage," and practical engineering experience.

Completion Acceptance Content and Inspection Items

1. Water Supply System:

• Content: Check the water source inlet pipe, pressurization equipment (water pumps, water tanks), pipe network layout, valves, and water meter installation to ensure compliance with design drawings.
• Inspection Items:
• Pressure Test: According to Article 4.2.1 of GB 50242, water supply pipes must undergo a hydrostatic test. The test pressure shall be 1.5 times the working pressure and not less than 0.6 MPa, with the pressure held for 10 minutes and a pressure drop not exceeding 0.02 MPa. In a five-star hotel project I once worked on, the pressure test failed because pipe joints were not tightened; the joints were re-welded and passed re-inspection.
• Flushing and Disinfection: After pipe flushing, water quality must comply with the "Standards for Drinking Water Quality" (GB 5749), with turbidity, residual chlorine, and other parameters tested. Practical case: A hotel did not flush thoroughly, and the initial water came out yellow; it met standards after a second flushing.
• Flow and Pressure: Test the outlet pressure at the most unfavorable point (e.g., top-floor guest room), which must be ≥0.15 MPa (per Article 3.6.1 of GB 50015), and verify the pump head and flow rate.

• Content: Check the slope of sewage, wastewater, and rainwater pipes, vent pipe installation, floor drains, and inspection well installation.
• Inspection Items:
• Water Filling Test: According to Article 5.2.1 of GB 50242, a water filling test shall be conducted before concealment. After filling with water for 15 minutes, the water level is observed for another 5 minutes; the test passes if the liquid level does not drop. For example, a hotel's underground drainage pipe was blocked due to insufficient slope; the problem was found after water filling, and it was resolved by adjusting the slope.
• Flow Capacity: Drainage points must drain smoothly without backflow or overflow. In a project I participated in, the vent pipe did not extend above the roof, causing poor drainage on the ground floor; it was resolved by adding a vent pipe.
• Closed Water Test: For outdoor drainage pipes, check for leakage; the water level drop shall not exceed 5 mm over 24 hours.

• Content: Check the heat source (e.g., boiler or heat pump), circulation pumps, insulation layer, thermostatic valves, and return pipes.
• Inspection Items:
• Hydrostatic Test: Same as the water supply system, but attention must be paid to the effects of thermal expansion and contraction of hot water pipes. According to Article 6.2.1 of GB 50242, the test pressure shall be the working pressure plus 0.1 MPa and not less than 0.3 MPa.
• Water Temperature Test: The outlet temperature at the farthest water use point shall be 55–60°C (according to Article 6.3.1 of GB 50015), and the circulating return water temperature shall not be lower than 50°C. A hotel once had a remote-end water temperature of only 40°C due to improper circulation pump selection; it was resolved by replacing the pump unit.
• Insulation Performance: Check the insulation layer thickness (e.g., rubber-plastic material ≥30 mm) to prevent heat loss; the surface temperature shall not exceed the ambient temperature by more than 10°C.

• Content: Check the fire water tank, pump adapters, fire hydrants, and sprinkler layout.
• Inspection Items:
• Fire Pump Startup: Simulate a fire signal to test automatic pump start/stop. According to Article 11.0.4 of GB 50974-2014 "Technical Code for Fire Water Supply and Hydrant Systems," the pump must start within 2 minutes.
• Fire Hydrant Flow Test: The solid stream from the nozzle at the most unfavorable point shall be ≥10 m (≥13 m for high-rise hotels). Practical case: A hotel had insufficient water pressure during the flow test; it was found that a pipe network valve was not fully open.
• Sprinkler System: The pressure at the end water test device shall be ≥0.05 MPa, the flow rate ≥1 L/s, and the alarm valve operation shall be checked.

• Content: Check the installation stability and drainage sealing of toilets, washbasins, showers, etc.
• Inspection Items: Full-water and flow tests to ensure no leakage and no odor. For example, a hotel toilet leaked after installation because the flange sealing ring was not compressed tightly; it was resolved after reinstallation.

Practical Engineering Cases

Concluding Summary

The above are reference opinions. The actual project situation still needs to be further evaluated and implemented comprehensively in combination with specific working conditions, site conditions, and other factors.