Hawaii Administrative Rules › Title 3 - DEPARTMENT OF ACCOUNTING AND GENERAL SERVICES › Building Code Council › State Plumbing Code › AMENDMENTS TO THE 2018 IAPMO UNIFORM PLUMBING CODE › Appendix - HAWAII SBCC1

Current through June, 2024
HS203 Air Admittance
					 Valve:
A one-way valve designed to allow air to
					 enter the plumbing drainage system when negative pressures develop in the
					 system The device closes by gravity, without springs or other mechanical means,
					 and seals the vent terminal at zero differential pressure (no flow conditions)
					 and under positive internal pressure The purpose of an air admittance valve is
					 to provide a method of allowing air to enter the plumbing drainage system
					 without the need for a vent extended outdoors to open air and to prevent sewer
					 gases from escaping into the building.
Justification:
This amendment provides a definition for Air Admittance
					 Valve
HS41211 Nonwater Urinals.
Nonwater urinals
					 shall have a liquid barrier sealant to maintain a trap seal. Nonwater urinals
					 shall permit the uninhibited flow of waste through the urinal to the sanitary
					 drainage system. Nonwater urinals shall be cleaned and maintained in accordance
					 with the manufacturer's instructions after installation. Where nonwater urinals
					 are installed, not less than one water supplied fixture rated at not less than
					 1 water supply fixture unit (WSFU) shall be installed upstream on the same
					 drain line to facilitate drain line flow and rinsing.
Note -
The code states the minimum
					 requirements for plumbing systems, therefore, no need for an option to rough-in
					 for water distribution lines to each individual urinal. The installer or owner
					 may choose to add water distribution lines to each individual urinal but not
					 required.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS414.0 Dishwashing Machines.
HS414.3 Drainage Connection.
Domestic
					 dishwashing machines shall discharge
directly
into a
					 wye branch fitting on the tailpiece of a kitchen sink, dishwasher connection of
					 a food waste disposer
or an air break into a standpipe in
					 accordance with Section 804.1
.
Where a domestic
					 dishwashing machine discharges indirectly through an air gap fitting, the
					 fitting shall be installed at or above the flood level marking of the sink or
					 drainboard, whichever is higher. Where the waste line connects to a kitchen
					 tailpiece or food waste disposer, it shall rise and be securely fastened to the
					 underside of the sink rim or counter.
Commercial dishwashing
					 machines shall discharge indirectly through an air break or direct connection.
					 The indirect discharge for commercial dishwashing machines shall be in
					 accordance with Section 807.1, and the direct discharge shall be in accordance
					 with Section 704.3.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS610.4 Sizing Water Supply and Distribution Systems.
Systems within the range of Table 610.4 shall be permitted to be sized
					 from that table or by the method in accordance with Section 610.5.
Manifold-type parallel water distribution systems shall be
					 installed in accordance with Section 610.13.
HS610.13 Manifold-Type Parallel Water
					 Distribution Systems
HS610.13.1 General.
Manifolds and parallel water distribution systems shall be listed
					 and installed in accordance with the manufacturer's installation instructions.
					 Parallel water distribution systems shall provide individual hot and cold water
					 supply lines from a manifold to each fixture served. Manifolds shall be
					 accessible where incorporating removable tubing connections or
					 valves,
HS610.13.2 Sizing.
Hot and cold water manifolds shall be sized in accordance with
					 Table 613.2(1) based on the total supply demand in gallons per minute.
					 Individual water distribution piping shall be sized in accordance with Table
					 613.2(2).
HS610.13.2 Valves.
Individual fixture shutoff valves shall be installed in accordance
					 with Section 606.5.
HS610.13.3 Installation.
Tubing shall be not less than 12 inches (305
					 mm) vertically or 6 inches (152 mm) horizontally from sources of high heat
					 unless protected by insulation or other approved methods. Tubing shall be
					 installed to permit expansion and contraction. Hot and cold water piping shall
					 be permitted to be bundled together provided that each individual hot water
					 piping is insulated and permits movement. Tubing passing through drilled or
					 notched metal studs or metal joists, or hollow-shell masonry walls shall be
					 protected from abrasion by elastomeric or plastic sleeves or
					 grommets.
HS6
10.13.4
Support.
Tube bundles shall be supported in accordance
					 with Table 313.3. Supports at changes in direction shall comply with the
					 manufacturer's instructions.
TABLE
					 610.13.2(1)
MANIFOLD
					 SIZING
INTERNAL DIAMETER
								(inches)
MAXIMUM DEMAND (gallons per
								minute)
VELOCITY at 4 feet per
								second
VELOCITY at 8 feet per
								second
1/2
2
5
3/4
6
11
1
10
20
1 1/4
15
31
1 1/2
22
44
2
27
54
For SI units: 1 inch = 25 mm, 1 gallon per
					 minute = 0.06 L/s, 1 foot per second = 0,3048 m/s
TABLE
					 610.13.2(2)
MINIMUM SIZES OF INDIVIDUAL FIXTURE WATER
					 SUPPLY PIPING
FIXTURE
MINIMUM PIPE SIZE
								(inches)
Bathtub or Combination
								Bath/Shower
1/2
Bidet
3/8
Clothes
								Washer
3/8
Lavatory'
3/8
Sinks
Bar
3/8
Kitchen,
								domestic
3/8
Laundry
3/8
Sendee or Mon
								Basin
1/2
Shower, per
								head
1/2
Urinal, 1.0 GPF Flushometer
								Valve
3/4
Urinal. Flush
								Tank
1/2
Water Closet. 1.6 GPF Gravity'
								Tank
3/8
Water Closet, i .6 GPF Flushometer
								Tank
3/8
Water Closet. 1.6 GPF Flushometer
								Valve
3/4
For SI units: 1 inch - 25
					 mm
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS610.141610.131
					 Exceptions,
(Renumber existing Section 610.13 to Section 610.14)
TABLE 702.1 DRAINAGE FIXTURE UNIT VALUES
					 (IHT)
PLUMBING, APPLIANCES, APPURTENANCES, OR
								FIXTURES
MINIMUM SIZE TRAP AND TRAP ARM
								(inches)
PRIVATE
PUBLIC
ASSEMBLY
Shower, single-head trap
2.0
2.0
2.0
Notes:
9 For a bathtub to
					 shower retrofit, a 1 1/2"(40 mm) trap and trap arm shall be permitted with a
					 maximum shower size of 36 inches [LESS THAN]914 mm) in width and 60 inches
					 (1524 mm) in length.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS718.1 Slope.
Building sewers shall be run in
					 practical alignment and at a uniform slope of not less than 1/4 inch per foot
					 (20.8 mm/m) toward the point of disposal.
Exception:
Where it is impractical, due to the
					 depth of the street sewer or to the structural features or the arrangement of a
					 building or structure, to obtain a slope of 1/4 inch per foot (20.8 mm/m), such
					 pipe or piping 4 inches (100 mm) through 6 inches (150 mm) shall be permitted
					 to have aslope of not less than 1/8 inch (10.4 mm/m) and such piping 8 inches
					 (200 mm) and larger shall be permitted to have a slope of not less than 1/16
					 inch per foot (5.2 mm).
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS804.1.1 Laundry Trav Waste Connection
					 to Standpipe. A
laundry trav waste connection
					 shall be permitted to connect into a standpipe receptor for a clothes washer
					 drain. The standpipe for a clothes washer drain shall extend not less than 30
					 inches (762 mm) above the weir of the standpipe trap and shall extend above the
					 flood level rim of the laundry tray. The waste outlet of the laundry trav shall
					 be not more than 30 inches horizontally apart from the
					 standpipe.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
Justification:
This amendment is required to coordinate with amendment
					 HS414.3.
HS906.1.1 Sidewall Venting.
Where sidewall venting is utilized, the vent
					 shall not terminate under a vented overhang of a building and shall be located
					 in accordance with Section 906.2. The vent terminal shall be directed downward
					 and covered with a 3/32 of an inch (2.4 mm) mesh screen to prevent the entry of
					 vermin or rodents.
Note: Section 906.2 requires that each vent
					 shall terminate not less than 10 feet (3048 mm) from, or not less than 3 feet
					 (914 mm) above, an openable window, door, opening, air intake, or vent shaft,
					 or not less than 3 feet (914 mm) in every direction from a lot line, alley and
					 street excepted.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS908.2 Horizontal Wet Venting for a Bathroom Groups.
A maximum of two water closets, four lavatories, two
					 bathtubs or combination bath/showers or showers, two bidets or two emergency
					 floor drains connected to a horizontal branch drain on the same floor level
					 shall be permitted to be vented by a horizontal wet vent. Each fixture drain
					 shall connect independently in a horizontal plane of less than 45 degrees (0,79
					 rad) with the horizontal wet vent The horizontal wet vent shall be considered
					 as a vent from the most downstream fixture drain connection to the most
					 upstream fixture drain connection to the horizontal branch
					 drain.
HS908.2.1 Vent Connection.
The dry vent
shall connect to the horizontal branch drain and shad be installed
					 in accordance with Section 905.2. Section 905.3. and Section
					 905.5.
Only one wet-vented fixture drain or trap arm shall
					 discharge upstream of the dry-vented fixture drain connection.
HS908.2.2 Size.
The
horizontal
wet vent shall be sized based on the
					 fixture unit discharge into the
horizontal
wet vent
and
shall be not less than 2 inches (50 mm) in
					 diameter for 4 drainage fixture units (dfu) or less, and not less than 3 inches
					 (80 mm) in diameter for 5 dfu or more. The dry' vent shall be sized in
					 accordance with Table 702.1 and Table 703.2 based on the total fixture units
					 discharging into the
horizontal
wet vent.
HS908.2.3 Trap Arm.
The length of the
fixture
trap arm shall not exceed the limits in Tabic
					 1002.2. The trap size shall
comply
with Section
					 1003.3.
HS908.2.4
Fixtures
. The
A
water closet fixture drain or trap arm connection to the
horizontal
wet vent shall be
located
downstream of
other
fixture drain or trap
					 arm connections
made
to the horizontal wet vent.
other
fixtures,
other than wet vented
					 fixtures
,
located
downstream of the
horizontal
wet vent
shall be vented in
					 accordance with Section 901.2.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS912.0 Air Admittance
					 Valves.
HS912.1 General.
Vents shall be permitted to terminate to an air admittance valve
					 where installed in accordance with this section. Stack-type air admittance
					 valves shall comply with ASSE 1050. Individual and branch-type air admittance
					 valves shall comply with ASSE 1051,
HS912.1.1 Vent Required.
A minimum of one stack vent or vent stack
					 shall extend to the open air on every building drainage and vent system
					 utilizing air admittance valves.
HS912.2 Installation.
Air admittance valves shall be installed in
					 accordance with the manufacturer's installation
					 instructions.
HS912.3 Where Permitted.
Individual, branch and circuit vents shall be
					 permitted to terminate with a connection to an individual or branch-type air
					 admittance valve. Stack vents and vent slacks shall be permitted to terminate
					 to stack-type air admittance valves. An individual and branch-Woe air
					 admittance valves shall only serve as the vent terminal for fixtures located on
					 the same floor level. The horizontal branch drain having individual and
					 branch-type air admittance valves shall comply with Section 912.3.1 or Section
					 912.3.2. Stack-type air admittance valves shall comply with Section
					 912.3.3.
HS912.3.1 Location of Branch,
The horizontal branch drain shall connect to
					 the drainage stack or building drain not more than five stories from the top of
					 the stack.
HS91
2.3.2
Relief Vent.
Where the horizontal branch is located more
					 than five stories from the top of the stack, the horizontal branch shall be
					 provided with a relief vent that shall connect to a vent stack or stack vent,
					 or extend outdoors to the open air. The relief vent shall connect to the
					 horizontal branch drain between the stack and die most downstream fixture drain
					 connected to the horizontal branch drain. The relief vent shall be not less
					 than 2 inches (50 mm) in diameter. The relief vent shall be permitted to serve
					 as the vent for other fixtures.
HS912.3.3 Stack Type Connection.
Stack-type air admittance valves shall connect
					 to vent stacks or stack vents that serve drainage stacks not exceeding seven
					 stories in height.
HS912.4 Location.
Individual and branch-type air admittance valves shall be located
					 not less than 4 inches (102 mm) above the horizontal branch drain or fixture
					 drain being vented. Stack-type air admittance valves shall be located not less
					 than 6 inches (152 mm) above the flood level rim of the highest fixture being
					 vented. The air admittance valve shall be located within the maximum developed
					 length permitted for the vent. The air admittance valve shall be installed not
					 less than 6 inches (152 mm) above insulation materials.
HS912.5
Access
and Ventilation.
Air admittance valves shall be accessible. The
					 valve shall be located within a ventilated space that allows air to enter the
					 valve.
HS912.6 Size.
The air admittance valve shall be sized for the fixture unit
					 discharge and drainage pipe size of the connected drain.
HS912.7 Prohibited Installation.
Air admittance valves shall not be installed
					 in the following applications:
(1)
vents for chemical or
				  special waste systems.
(2)
vent sumps or receiving
				  tanks.
(3)
located in supply or return plenums.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS913.0 Engineered Vent
					 Systems.
(Renumber existing Section 912.0 to Section 913.0)
HS1001.2 Where Required.
Each plumbing fixture
					 shall be separately trapped by an approved type of liquid seal trap. This
					 section shall not apply to fixtures with integral traps. Not more than one trap
					 shall be permitted on a trap arm. Food waste disposers installed with a set of
					 restaurant, commercial, or industrial sinks shall be connected to a separate
					 trap.
A trap serving a laundry trav shall be permitted to receive
					 the waste from a clothes washer set adjacent to it.
The vertical
					 distance between a fixture outlet and the trap weir shall be as short as
					 practicable, but in no case shall the tailpiece from a fixture exceed 24 inches
					 (610 mm) in length. One trap shall be permitted to serve a set of not more than
					 three single compartment sinks or laundry* tubs of the same depth or three
					 lavatories immediately adjacent to each other and in the same room where the
					 waste outlets are not more than 30 inches (762 mm) apart, and the trap is
					 centrally located where three compartments are installed.
Note -
The combination of this option will
					 permit a laundry tray (without a trap) to discharge into an indirect waste
					 standpipe for a clothes washer. Two areas in the plumbing code need to be
					 addressed (I) clothes washer standpipe is higher than the flood level rim of
					 the laundry tray to prevent flooding at the clothes washer standpipe if a
					 stoppage should occur downstream (laundry tray providing a buffer against
					 overflow of the standpipe as the laundry trap will fill up with the washer
					 discharge) and (2) 30-inch horizontal limitation between the laundry trap and
					 clothes washer standpipe.
Justification:
This amendment is required to coordinate with amendment
					 HS804.L1.
HS1002.2 Fixture Traps.
Table 1002.2 Horizontal Lengths of Trap Arms
is amended as follows:
TABLE 1002.2 HORIZONTAL LENGTHS OF TRAP
					 ARMS1
TRAP ARM PIPE DIAMETER
								(inches)
DISTANCE TRAP TO VENT MINIMUM
(inches)
LENGTH MAXIMUM (inches)
1 1/4
2 1/2
60
1 1/2
3
75
2
4
100
3
6
150
4
8
200
Exceeding 4
2 x Diameter
Diameter x ratio of
								slope
For SI units: 1 inch = 25.4 mm
Notes:
1 Maintain 1/4 inch per foot
					 slope (20.8 mm/m).
For slopes other than 1/4 inch per foot (20.8
					 mm), divide the pipe diameter by the slope to determine the maximum allowable
					 length,
Justification:
This amendment is required to coordinate with amendment
					 HS908.2.3.
HS1007.0 Trap Seat Protection.
HS1007.1 General.
Floor drains and
					 traps subject to evaporation due to infrequent use shall be protected with a
					 water supplied trap seal primer, drainage supplied trap seal primer or floor
					 drain trap seal protection device. Water supplied trap seal primers shall be
					 accessible for maintenance.
HS1007.2 Trap Seal Primers and Floor Drain Trap Seal
					 Protection Devices.
Potable water supply trap seal primer valves shall
					 comply with ASSE 1018. Drainage and electronic design type trap seal primer
					 devices shall comply with ASSE 1044.
Barrier-type trap seal
					 protection devices shall comply with ASSE 1072.
Justification:
This amendment provides code users the option to utilize an
					 alternative method or design which the user considers to be beneficial to their
					 system requirements.
HS1701.1
Referenced Standards
is
					 amended by adding the following:
TABLE 1701.1 REFERENCED STANDARDS
STANDARD NUMBER
STANDARD TITLE
APPLICATION
REFERENCED SECTIONS
ASSE
								1050-2009
Stack Air Admittance Valves for
								Sanitary Drainage System
Valves
HS912.1
ASSE
								1051-2009
Individual and Branch Type Air
								Admittance Valves for Sanitary Drainage Systems
Valves
HS912.1
ASSE
								1072-2007
Barrier Type Floor Drain Tran Seal
								Protection Devices
DWV
								Components
HS 1007.2
Justification:
This amendment is to add the standards that arc referenced
					 in amendments HS912.I and HS1007.2.