What is the maximum length for a standpipe serving a clothes washer?

The maximum length for a standpipe serving a clothes washer is specified as 30 inches. This measurement is crucial because proper standpipe height ensures that the discharge from the washer is effectively routed into the plumbing system without risk of backflow or overflow.

A standpipe that is too short might not accommodate the flow rate from the washer, leading to potential spillage or flooding, while one that is excessively long can create traps or siphoning issues, affecting the appliance’s performance. Therefore, the 30-inch standard serves to balance these considerations, optimizing both function and safety within the plumbing system. This regulation is in place to maintain system efficiency and safeguard against plumbing failures.