FWG Draining into FWG

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andyb

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Hi,

I have noticed on a particular job they are draining basins into a floor drain and then into another floor drain to try and avoid installing a vent. Is this code compliant?

Thanks
 
What are the basins used for?
In some food establishments it is required for the slop sink to have an indirect drain. This would be as you describe, but only into one floor sink. The pipe from the sink drain line would be to stop 1" above the lip of the floor sink.

The purpose of this is to prevent large particles from entering the city waste system and to make it impossible for the sewer system to back up into the food sinks, commercial dishwashers, yogurt/ice cream machines, and ice machines.

The whole thing about going from one floor sink to another floor sink confuses me on your question. How would they get the necessary fall to drain from one floor sink to another if the drains are on the bottom of each floor sink.

Please explain your conditions, location and type of sink and its use.

Erik


From the 2007 CPC


801.0 Indirect Wastes.
801.1 Airgap or Airbreak Required. All indirect
waste piping shall discharge into the building
drainage system through an airgap or airbreak as set
forth in this code. Where a drainage airgap is
required by this code, the minimum vertical distance
as measured from the lowest point of the indirect
waste pipe or the fixture outlet to the flood-level rim
of the receptor shall be not less than one (1) inch
(25.4 mm).
801.2 Food and Beverage Handling Establishments.
Establishments engaged in the storage, preparation,
selling, serving, processing, or other handling of food
and beverage involving the following equipment that
requires drainage shall provide indirect waste piping
for refrigerators, refrigeration coils, freezers, walk-in
coolers, iceboxes, ice-making machines, steam tables,
egg boilers, coffee urns and brewers, hot-and-cold
drink dispensers, and similar equipment.
801.2.1 Except for refrigeration coils and icemaking
machines, the minimum size of the
indirect waste pipe shall not be smaller than the
drain on the unit, but shall not be smaller than
one (1) inch (25 mm), and the maximum
developed length shall not exceed fifteen (15)
feet (4,572 mm). Indirect waste pipe for icemaking
machines shall not be less than the drain
on the unit, but shall not be less than threequarters
(3/4) inch (20 mm).
801.2.2 For walk-in coolers, floor drains may be
connected to a separate drainage line discharging
into an outside receptor. The flood-level rim of
the receptor shall be a minimum of six (6) inches
(152 mm) lower than the lowest floor drain. Such
floor drains shall be trapped and individually
vented. Cleanouts shall be provided at every
ninety (90) degree (1.6 rad) turn and shall be
accessibly located. Such waste shall discharge
through an airgap or airbreak into a trapped and
vented receptor, except that a full-size airgap is
required where the indirect waste pipe may be
under vacuum.
801.2.3 Food-preparation sinks, steam kettles,
potato peelers, ice cream dipper wells, and
similar equipment shall be indirectly connected
to the drainage system by means of an airgap.
Bins, sinks, and other equipment having
drainage connections and used for the storage of
unpackaged ice used for human ingestion, or
used in direct contact with ready-to-eat food,
shall be indirectly connected to the drainage
system by means of an airgap. Each indirect
waste pipe from food-handling fixtures or
equipment shall be separately piped to the
indirect waste receptor and shall not combine
with other indirect waste pipes. The piping from
the equipment to the receptor shall not be
smaller than the drain on the unit, and it shall
not be smaller than one-half (1/2) inch (15 mm).
801.3 Bar and Fountain Sink Traps. Where the
sink in a bar, soda fountain, or counter is so located
that the trap serving the sink cannot be vented, the
sink drain shall discharge through an airgap or
airbreak (see Section 801.2.3) into an approved
receptor that is vented. The developed length from
the fixture outlet to the receptor shall not exceed five
(5) feet (1524 mm).
801.4 Connections from Water Distribution
System. Indirect waste connections shall be
provided for drains, overflows, or relief pipes from
potable water pressure tanks, water heaters, boilers,
and similar equipment that is connected to the
potable water distribution system. Such indirect
waste connections shall be made by means of a
water-distribution airgap constructed in accordance
with Table 6-3.
801.5 Sterilizers. Lines, devices, or apparatus such
as stills, sterilizers, and similar equipment requiring
waste connections and used for sterile materials shall
be indirectly connected by means of an airgap. Each
such indirect waste pipe shall be separately piped to
the receptor and shall not exceed fifteen (15) feet
(4,572 mm). Such receptors shall be located in the
same room.
801.6 Drip or Drainage Outlets. Appliances, devices,
or apparatus not regularly classed as plumbing
fixtures, but which have drip or drainage outlets,
may be drained by indirect waste pipes discharging
into an open receptor through either an airgap or
airbreak (see Section 801.2.1).
802.0 Approvals.
No plumbing fixtures served by indirect waste pipes
or receiving discharge therefrom shall be installed
until first approved by the Authority Having
Jurisdiction.
 
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