Rev. 13 November 1, 2016
Page | 50a. For typical sanitary waste and vent systems of 3” diameter and above, install service weight cast iron (no-hub
or bell-and-spigot) pipes.
b. For typical sanitary waste and vent systems below 3” diameter, install copper (ASTM B88, Type L) pipe with
wrought sanitary fittings throughout; use of cast iron piping is allowed only if authorized by the Owner.
c. For typical below-ground waste and vent systems, install standard weight cast iron
(bell-and-spigot) pipes.
d. All flanges on water closets shall be 3” and the floor sealed appropriately. Waste lines may be increased to
4” at the next fitting closest to the water closet.- Routings
a. Horizontal lengths of all branch sanitary runs (as measured to either the building main or a sewage ejector)
shall not exceed 80 linear feet.
b. Cleanouts shall not be installed over 60 linear feet apart. Typical cleanouts shall be installed on the next level
up, either in a floor or wall configuration. Cleanouts shall be located in soiled utility rooms, housekeeping
rooms, etc. Do not locate cleanouts in finished spaces.
c. Plumbing vents-thru-roof shall not be installed any closer than twenty-five feet to the nearest outside air
intake or operable window.
d. Sanitary tees, crosses or double combinations shall not be installed. - Sewage ejectors
a. Owner approval is required for installation of sewage ejectors.
b. If installed, all sewage ejectors shall have heavy duty self-priming duplex pumps of the self-priming type
or, when authorized by the Owner, the submersible type. Sewage ejectors shall be provided with
automatic alternators to distribute operation to both pumps on each successive cycle and to operate both
pumps when one pump cannot handle the load. Sewage ejectors shall be Hydromatic model MPC, equivalent
by Metropolitan or Owner authorized equal.
c. Provide twin level alarms. The first alarm shall be an audible local alarm and the second alarm shall be
wired back to the Building Automation and Control System (BACS).
d. Overhead lifting hooks shall be provided to aid in motor and/or pump replacement.
e. All sewage basins shall be poured concrete, precast concrete, or fiberglass, or Owner approved equal and shall
have a minimum diameter of 36”. Covers for sewage basins shall be airtight.
22 13 19 Sanitary Waste Piping Specialties- Grease interceptors
a. All grease interceptors shall be the bacteria-driven type in order to minimize cleaning requirements. - Oil interceptors
a. Provide with cathodic protection.
b. Provide with explosion proof level switch with local light and audible alarm to indicate high oil level.
The alarm shall also be wired back to the BACS. - Traps
a. Factory P-traps shall not be installed on floor-mounted fixtures such as janitor’s closets, or floor drains.
These fixtures shall be installed with either a P-trap with cleanout plug or a running trap.
b. Factory P-traps are acceptable at other locations.
22 14 00 Facility Storm Drainage