Building Code Guides (BCGs) and Building Official Determinations (BODs) provide answers about the application of building codes and outline optional alternates. BODs are typically smaller in scope and address simpler questions. Code Guides provide a comprehensive alternative to a complicated set of code requirements.
BOD 16-01: Simplex Pumps
QUESTION: Can a single pump system (simplex pump) be used in the sewage ejector system in a commercial building when plumbing fixtures cannot be drained by gravity?
RESPONSE:The City of Portland has determined that when plumbing fixtures cannot be drained by gravity in commercial buildings, the use of simplex pumps will be allowed subject to the following:
- Each simplex pump may be used to serve one the following options:
- A maximum three bathroom plumbing fixtures (water closet, lavatory, urinal or shower/tub)
- A maximum of one laundry tub, two floor drains, two trench drains, and two floor sinks
- One clothes washer
- A maximum of two sinks in a commercial kitchen.
- Simplex pumps are allowed under all of the following conditions:
- More than one simplex pump is allowed in a building.
- Each simplex pump must have an individual sub-drain with a sewage ejector pump to a gravity drain. Per BES regulations, the pressure line must transition to a gravity line before entering the public right-of-way.
- The sizing of the simplex pump and sewage ejector required is per OPSC 710.3.
Other alternatives may be reviewed and considered on a case-by-case basis through the administrative appeals process.
HISTORY: Implemented May 16, 2016. Revised May 30, 2024.
DOWNLOAD a copy of this Building Official Determination:
QUESTIONS? Free 15-Minute Appointments for Permit, Code, and Zoning Questions