Secondary (Overflow) Roof Drainage. Secondary
Accessibility Guidelines (latest edition); and the Uniform
(overflow) roof drainage shall be accomplished by
Federal Accessibility Standard (latest edition).
sidewall scuppers, scupper drains, or a secondary
Plumbing fixture and accessory support shall be compliant
(overflow) roof drainage system. Secondary (overflow)
with code, state requirements, ADA/ADAAG, UFAS, and
roof drains shall be the same as roof drains except with
manufacturers requirements.
integral standpipe or damming weir extension 3-inches
above the waterproofing membrane and located within
Natural Gas Systems
5-feet of (adjacent to) the primary roof drain, and
extended to discharge above grade. Termination above
Service Entrance. Natural gas service utility piping
grade shall include a concealed elastomeric pinch valve
entering the building shall be protected from accidental
or similar for rodent proofing, near the discharge, and
damage by vehicles, foundation settlement or vibration.
finished discharge in high finish areas. Discharge shall
Wall penetrations shall be above grade and provided with
be in a non-occupied, non-pedestrian area that permits
a self-tightening swing joint located upstream of the
drainage away from the building and pedestrian access.
building and wall penetration). Where wall penetration
above grade is not possible, the gas pipe shall be within a
Rainwater Drainage Equipment
schedule 80 black steel, corrosion protected, sealed and
vented, gas pipe sleeve that extends from 10-feet upstream
Sand/Oil Separator. Floor drains and/or trench drains
of the building wall penetration exterior (or excavation
in vehicle parking structures and parking garages shall
shoring limits if greater) to 12-inches (minimum)
discharge to a sand/oil interceptor prior to discharge to
downstream of the building wall penetration. Gas piping
the storm sewer.
shall not be placed in unventilated spaces, such as trenches
or unventilated shafts, where leaking gas could accumulate
Plumbing Fixtures
(which could result in an explosion).
General. Provide all code, user, occupancy, safety, and
Gas Piping within Building Spaces. Gas shall not be
emergency required plumbing fixtures, including those
piped through confined spaces, such as trenches or
indicated in the U.S. Courts Design Guide. Plumbing
unventilated shafts. All spaces containing gas-fired
fixtures shall be manufactured by companies that are
equipment, such as boilers, chillers, water heaters, and
approved by the General Services Administration or
generators, shall be mechanically ventilated and include
their representatives and compliant with code and
CO2 monitoring and alarms. Vertical shafts carrying gas
state requirements. All plumbing fixtures shall have
piping shall be ventilated. Gas meters shall be located in a
motion/user sensing devices (with manual by-pass) for
ventilated gas meter room, thus avoiding leakage concerns
fixture operation and shall be water conserving/saving
and providing direct access to the local gas utility. All gas
type fixtures, faucets, and valves.
piping inside ceiling spaces shall have plenum rated
fittings. Diaphragms and regulators in gas piping must
Plumbing fixture accessibility clearances, installation,
be vented to the outdoors. There shall be no gas valves
and accessories shall be compliant with the Americans
(concealed or accessible) permitted above ceilings.
with Disabilities Act; Americans with Disabilities Act
165
MECHANICAL
ENGINEERING
5.18
Plumbing Systems
Revised March 2005 PBS-P100
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