(1)
Indirect Wastes Required.
(a)
Food and Beverage Handling
Establishments.
1. Food and
beverage handling establishments engaged in the storage, preparation, selling,
serving, processing, or in any manner the handling of food shall provide
indirect waste piping for refrigerators, refrigerator coils, walk-in freezers
or coolers, ice compartments, ice making machines, steam kettles, steam tables,
potato peelers, egg boilers, coffee urns, coffee, soda and beverage trays and
all similar types of equipment.
2.
In establishments which serve soda and alcohol, individual sink compartments
which store ice shall discharge independently into a floor drain or floor
sink.
3. Dishwashing pre-rinse
sinks installed in combination with a commercial dishwasher, pot sinks,
scullery sinks, hand washing sinks and similar shall not be indirectly wasted
and shall be directly connected to the sanitary drainage system.
4. Single compartment sinks or individual
compartments of multi-bay sinks for culinary or produce shall be individually
discharged into a properly vented floor sink or floor drain. These compartments
shall be properly labeled for produce preparation using a laminated sign with
letters two inches in height that reads: "This Compartment ONLY Is Designated
for Produce Preparation."
See 10.12
: Example
1
10.12: Example 1 - Culinary Sink
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5. All
indirect waste shall discharge either through an air gap or air-break into a
properly trapped and vented receptor. See 10.12, Example 4. An
air gap shall be required if the indirect waste pipe is under vacuum.
6.
Vacuum Systems for Food
Service Facilities.
a. Vacuum
drainage systems shall be installed in accordance with the equipment
manufacturer's installation instructions or be designed by a Massachusetts
professional engineer, regardless of discipline.
b. Plastic pipe and fittings shall be allowed
within ten feet of the equipment or above the equipment being served prior to
transitioning to commercial materials.
See 10.12:
Example 2.
10.12: Example 2 - Plastic with Vacuum
Systems
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(b)
Connections from Water
Distribution System. Indirect waste connections shall be provided
for drains, overflows, or relief lines from the water distribution system by
means of an air gap.
(c)
Sterilizers. Appliances, 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 air
gap.
(d)
Drips or
Drainage Outlets. Appliances, devices, or apparatus which have
drips or drainage outlets may be indirectly discharged into an open receptacle
through either an air gap or air-break.
(e)
Clear Water
Wastes.
1. All clear water waste
shall be cooled to a temperature no greater than 150 °F prior to
discharging into the storm or sanitary drainage system.
2. Expansion tanks, fire sprinkler systems,
air conditioning equipment, drip, or overflow pans, or similar devices that
waste clear water only, shall discharge into the building storm drainage system
through an indirect waste by means of an air gap or air-break. The flood level
rim of the indirect fixture shall be a minimum of two inches above floor level.
See 10.12: Example 3.
3. When clear water waste is discharged into
a storm system through a vented trap, the vent for that trap shall be labeled
"storm vent". Labels shall be:
a. At a
minimum of every ten feet:
b. At
all changes of direction:
c. On
each side of a penetration through a partition, wall, ceiling, or roof.
Exceptions:
i. Clear
water waste may discharge to sanitary systems in cities and towns with written
authorization from the authority having jurisdiction whose system will be
accepting the discharge.
ii. The
waste discharge from safe waste pans serving water heaters, storage tanks and
boilers may discharge to a properly trapped and vented fixture to the sanitary
drainage system.
iii. Clear water
condensate waste that is produced in cumulative amounts of 12.5 gallons per
hour or 300 gallons per day or less in buildings by air conditioning equipment,
air compressor blow-down discharge (free of petroleum hydrocarbons) or other
similar apparatus or appliances may be discharged to the sanitary drainage
system. The clear water waste requirement is not withstanding any local
ordinance, by-law, rule, or regulation to the contrary.
Example 3 -Clear Water Waste Discharge
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(f)
Safe Waste Pan.
1. Safe waste pans shall be installed under
water heaters, storage tanks or boilers that have a storage capacity of six
gallons or more and installed in a position elevated above any occupied
space.
2. Safe waste pans shall be
piped indirectly to properly trapped and vented fixtures or to a point within
12 inches of the lowest floor level.
See 10.12:
Example 4,
Drawing 1 for single heater
installation and Drawing 2 for multiple heater installations.
Exception: When installing a
replacement water heater, storage tank or boiler, an acceptable alternate
method may be to install a product accepted automatic water heater shut off
device and a safe waste pan without the related drain piping. If this method is
used, the water heater temperature and pressure relief valve shall discharge
into the water heater safe waste pan. See 10.12:
Example 4, Drawing 3.
3. The Minimum size waste pipe shall be one
inch. See 10.12: Example 4, Table for Sizing Safe Waste
Pans.
4. Where floor
drains and other acceptable points of indirect discharge are installed on the
same floor level, no safe waste shall be required.
5. Safe waste pans shall be at least two
inches deep and have a minimum clearance of two inches around the base of the
appliance being served.
6.
Materials for the Discharge Piping of Safe Waste Pans. Materials shall comply
with materials covered under
248
CMR
10.06 relating to commercial and
residential installations.
10.12 Drawing 1
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10.12 Drawing 2
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10.12 Drawing 3
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10.12 Drawing 4
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Table for Sizing Safe Waste Pan Mains
Relief Valve Size
|
Number of Heaters or Storage
Tanks
|
2
|
3
|
4 or More
|
3/4"
|
1-1/4"
|
1-1/4"
|
1-1/2"
|
1"
|
1-1/4"
|
1-1/2"
|
1-1/2"
|
1-1/4"
|
1-1/2"
|
1-1/2"
|
2"
|
1-1/2"
|
2"
|
2"
|
2"
|
2"
|
2"
|
2"
|
2"
|
(2)
Air Gap or Air-break
Required. All indirect waste piping shall discharge into the
building sanitary or storm drainage system through an air gap or air-break, as
stated in
248
CMR
10.12(1)(a)5., and in no
instance shall the indirect waste be trapped ahead of the air gap or air-break.
(a)
Methods of Providing an Air
Gap. The air gap between the indirect waste and the building
sanitary or storm drainage system shall be at least twice the effective
diameter of the drain served and shall be provided by one of the following
methods:
See 10.12:
Example 5,
Drawing 1.
1.
To
a Receptor. Extend the indirect waste pipe to an open, accessible
individual waste sink, floor drain or another fixture which is properly trapped
and vented.
2.
To the
Inlet Side of Trap. Provide an air gap in the drain connection on
the inlet side of the trap which receives the waste from the indirect
waste.
(b)
Methods of Providing an Air-break. When an air-break
is required between the indirect waste and the building sanitary or storm
drainage system, the distance to which the outlet of the indirect waste pipe
extends below the flood level rim of the receptacle into which it is
discharging shall be prescribed in
248
CMR
10.12.
See 10.12: Example 5,
Drawing 2.
10.12: Example 5 - Use of Air-Gap and Air
Break
Drawing 1: Use of Air Gap for Indirect Waste with a Floor
Sink
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Drawing 2: Use of Air-Break for Indirect Waste with a
Floor Sink
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(3)
Receptors or
Sumps.
(a)
Installation. Indirect waste receptors and sumps
serving indirect waste pipes shall not be installed in toilet facilities or in
any location that is an inaccessible or unventilated space such as a closet,
storeroom, or crawl space.
(b)
Size of Receptor. The pipe size serving a receptor
shall be a minimum of one size larger than the largest indirect waste it
serves.
(c)
Cleanout
Location. If the indirect waste receptor is set below floor level,
it shall be equipped with a running trap adjacent thereto with the trap
cleanout brought level with the floor.
(d)
Strainers and
Baskets. Every indirect waste receptor shall be equipped with a
readily removable metal basket over which all indirect waste pipes shall
discharge, or the indirect waste receptor outlet shall be equipped with a
beehive strainer not less than four inches in height.
(e)
Splashing to be
Prevented. All plumbing receptors receiving the discharge of
indirect waste pipes, shall be of a design and capacity to prevent splashing or
flooding of the adjacent area.
(f)
Domestic or Culinary Fixture Prohibited as Receptors.
No plumbing fixture which is used for domestic or culinary purposes shall be
used to receive the discharge of an indirect waste pipe, except that in a
residence a kitchen sink is acceptable for use as a receptor for dishwashers
and portable clothes washing machines provided the kitchen sink drain in a
minimum of two inch.
(4)
Condenser Sumps. No steam condenser waste pipe shall
directly connect to any part of a sanitary or storm drainage system, nor shall
any water above 150 °F be discharged into any part of a sanitary or storm
drainage system.
(5)
Installation of Indirect Waste Piping.
(a)
Accessibility.
Indirect waste piping shall be installed to enable ready access for flushing,
cleaning, or replacement.
(b)
Sizing. Any fixture or piece of equipment to be
indirectly wasted that has a waste outlet smaller than 1¼ in diameter
shall be connected to an indirect waste pipe one size larger than said
outlet.
(c)
Indirect
Waste Piping.
1.
Individual Indirect Waste. An indirect waste which
connects to one waste outlet and extends to the receiver shall be classified as
an Individual Indirect Waste.
2.
Indirect Waste Branch. An indirect waste which
connects to one waste outlet and extends to either an indirect waste main or an
indirect waste branch main shall be classified as an Indirect Waste
Branch.
3.
Indirect
Waste Main. An indirect waste which connects to more than one
waste outlet and extends to the receiver shall be classified as an Indirect
Waste Main.
4.
Indirect
Waste Branch Main. A branch from an indirect waste main which
connects to more than one waste outlet shall be classified as an Indirect Waste
Branch Main.
(d)
Traps.
1. A trap
shall not be installed on an indirect waste main or on an indirect waste branch
main.
2. A trap may be installed on
any indirect waste branch or individual indirect waste where it is necessary or
desirable to prevent the flow of air from inside the indirect waste piping
through the indirect waste branch.
(e)
Air Circulation Through
Indirect Waste Piping.
1.
Provision shall be made so that air can circulate freely through an individual
waste, waste main or a waste branch main.
2. When a waste branch is trapped a properly
sized vent shall be installed.
3.
An indirect waste stack receiving the discharge from fixtures on two or more
floors shall be extended to the outer air as required for a stack
vent.
(6)
Multiple Occupancy.
(a) When a system of indirect waste piping
serves buildings or premises having more than one tenant occupancy, it shall be
designated as a "Central Indirect Waste System" and connection to it from
separate tenant occupancies shall be designated as "Separate Indirect Waste
Systems."
(b) Separate indirect
waste systems shall be connected to "Central Indirect Waste Systems" as
follows:
1. The indirect waste branch to a
separate occupancy shall be trapped, and this trap shall serve as a secondary
indirect waste receiver for the separate indirect waste system.
2. The indirect waste branch to a separate
occupancy may be from a horizontal indirect waste main or branch main, or from
an indirect waste stack.
(c)
Secondary Indirect Waste
Receivers.
1. Traps serving
secondary indirect waste receivers shall be protected from siphonage by
adequate individual battery of stack vents.
2. Vents on indirect waste piping systems
shall not be connected to the vents of any other piping system but shall be
extended separately to the outer air as required for stack
vents.