810.1 High-Temperature Discharge — 2025 California Plumbing Code

No steam pipe shall be directly connected to plumbing or drainage system, nor shall water having a temperature above 140°F (60°C) be discharged under pressure directly into a drainage system. Pipes from boilers shall discharge by means of indirect waste piping as determined by the Authority Having Jurisdiction or the boiler manufacturer’s recommendations. Such pipes shall be permitted to be indirectly connected by discharging into an open or closed condenser or an intercepting sump of an approved type that will prevent the entrance of steam or such water under pressure into the drainage system. Closed condensers or sumps shall be provided with a vent that shall be taken off the top and extended separately, full size above the roof. Condensers and sumps shall be properly trapped at the outlet with a deep seal trap extending to within 6 inches (152 mm) of the bottom of the tank. The top of the deep seal trap shall have a 3/4 of an inch (19.1 mm) opening located at the highest point of the trap to serve as a siphon breaker. Outlets shall be taken off from the side in such a manner as to allow

a waterline to be maintained that will permanently occupy not

182 2025 CALIFORNIA PLUMBING CODE

INDIRECT WASTES

less than one-half the capacity of the condenser or sump. Inlets shall enter above the waterline. Wearing plates or baffles shall be installed in the tank to protect the shell. The sizes of the blowoff line inlet, the water outlets, and the vent shall be as shown in Table 810.1. The contents of condensers

receiving steam or hot water under pressure shall pass through an open sump before entering the drainage system.

TABLE 810.1

PIPE CONNECTIONS IN BLOWOFF

CONDENSERS AND SUMPS (inches)

For SI units: 1 inch = 25 mm

• To be used only with boilers of 100 square feet (9.29 m [2] ) of heating surface or less.