How Is Water Supply Plumbing Sized for a Vended Laundry?

I build a fixture schedule from the manufacturer data: every washer, its capacity, its fill valve sizes, and its hot and cold demand. Then I define the coincident fill — the realistic worst case, which in a vended store is a large share of machines filling together during a rush. The service, meter, and distribution mains get sized for that event with pressure verified at the most remote washer. Velocities are kept within limits that balance pipe cost against noise and hammer, and I route mains to keep branch runs short — long skinny branches to far washers are where pressure problems are born.

A laundry's valves are the harshest duty most commercial plumbing sees. I place water hammer arrestors at valve groups, specify slow-closing or sequenced valves where the equipment allows, and design supports and anchors for a system that pulses constantly. Pressure regulation goes in where the street pressure is high enough to damage valves or cause excessive flow, and expansion provisions handle the thermal growth in hot water runs. The goal is a system the owner never thinks about — no banging pipes, no mysterious valve failures, no callbacks.

A laundry that can't be serviced without closing the store is a design failure: • Isolation valves at each washer row or bank so one machine's repair doesn't shut down the floor • Full-port ball valves on individual machines where maintenance access justifies them • A properly sized water meter coordinated with the utility — undersized meters throttle everything • Hose bibbs with backflow protection for washdowns, located where the crew actually cleans • Accessible main shutoff and backflow assembly with clearance for annual testing • Labeled valves and an as-built valve schedule so the night crew can find things