Rainwater Drainage System
shall be sized compliant with requirements of the local
authority. Where permitted by the local authority, grease
Rainwater Drainage (Storm) Pipe and Fittings. A
interceptors shall be compliant with the Plumbing and
complete rainwater (storm) building drainage system
Drainage Institute (PDI) PDI-G101. Drains, fixtures, and
equipment required to discharge to the grease interceptor
roofs, plazas, balconies, decks, area wells, parking
shall be as required by the state health department and
structures, parking garages, and similar. Clearwater
local authorities. Generally food grinders, vegetable sinks,
drainage (cooling coil condensate drainage, evaporation
fish scaling sinks (provide separator), meat cutting sinks,
pan drainage, ice makers) and similar clear, non-
and clear water wastes are prohibited by the local
chemically treated drainage shall discharge to the
authority from extending to the grease interceptor, and
rainwater (storm) drainage system, and not the sanitary
shall not be employed except where otherwise required
drainage system. Clearwater drainage without chemical,
by the local authority.
vegetable, human, animal, protein, fecal, oil, grease or
similar pollutants may be discharge to the rainwater
Sand/Oil Separator. Floor drains and/or trench drains in
(storm) drainage system where approved by code, state,
vehicle repair garages shall discharge to a sand/oil
local authority, and Environmental Protection Agency.
separator prior to discharge to the sanitary sewer.
The rainwater (storm) and vent system shall be designed
Automatic Sewage Ejectors. Sewage ejectors shall only be
in compliance with applicable codes and standards. P-
used where gravity drainage is not possible. Only sanitary
traps and house-traps shall only be provided on storm
drainage from the lowest floors of the building shall be
systems where required by code, state, or local authority.
connected to the sewage ejector; fixtures on upper floors
shall use gravity flow to the public sewer. Sewage ejectors
Piping shall be service weight cast iron soil pipe with hub
shall be non-clog, screen-less, alternating duplex pumps,
and spigot fittings and joints with elastomeric gasket
capable of passing a 2-inch solid, with each discharge not
(by pipe manufacturer). Above ground piping shall
less than 102 mm (4 in) in diameter. They shall be
|have hubless (no-hub) fittings and joints (by pipe
connected to the emergency power system.
manufacturer) with pipe support compliant with hubless
(no-hub) pipe standard compliant with code (generally
Sanitary Drainage. Clearwater drainage: storm rain water,
within 12 inches of each side of each joint).
cooling coil condensate drainage, and similar clearwater
drainage shall not discharge to the sanitary drainage
Rainwater (Storm) Vent Piping and Fittings. Storm vent
system.
piping, where required for P-traps, sumps, interceptors,
and separators, shall be service weight cast iron soil pipe
Chemically treated mechanical discharge from cooling
with hub and spigot fittings and joints with elastomeric
towers, boilers, chillers, and other mechanical equipment
gasket (by pipe manufacturer). Above ground piping
shall discharge to the sanitary drainage system for
shall have hubless (no-hub) fittings and joints (by pipe
treatment and protection of the environment and
manufacturer), or Type-K DWV copper with 95-5 tin
waterways. Purified steam (i.e. humidification) shall not
antimony solder joints.
discharge to the sanitary drainage system
163
MECHANICAL
ENGINEERING
5.18
Plumbing Systems
Revised March 2005 PBS-P100
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