Transcript Slide 1

STUDOR
®
AUSTRALIA
Presents
STUDOR® Air Admittance Valves
Module 2
Group and Stack Venting
•©MTW Studor Aust. Oct 2004
Preface:
• This presentation is intended to provide the
participants with the most current
information available at time of publication
and draws on Australian National Standards
AN/NZS3500.2.2003.
• This presentation is at best, a guide, and it is
always the installers responsibility to
confirm the local regulations, variations and
options that apply in their state and/or area.
This Course:
should at its completion, enable the participants to:
1.
2.
correctly identify the components of the Mini-Vent and
Maxi-Vent Air Admittance Valve (AAV)
correctly install both in Group Venting and Stack Venting
applications
The Assessment:
will be via a written Question & Answer Sheet at the end of the
course
(Participants are advised to make note of items marked with a ‘*’)
Introduction
• It is assumed that the participants in this
course have completed the first module of
this course or have at least practical
experience with the installation and
application of Air Admittance Valves as
single fixture vents.
• In this module we will learn their
applications as Group and Stack Vents.
Introduction
• * Studor Mini-Vent & Maxi-Vent Air Admittance Valves
can be used for venting groups of fixtures such as
domestic bathrooms and en-suites up to commercial
washrooms, toilet blocks etc
This is : “Group Venting”
• * The Mini-Vent and Maxi-Vent can also vent the vertical
pipes or stacks that connect these groups of fixtures on
various floors in multi-storey applications These pipes
can vary in size from 50mm to 200mm:
This is “Stack Venting”
The Valves
MINI-VENT™
MAXI-VENT™
Airflow of 7.5 litres/second at -250 Pa
Airflow of 32 litres/second at -250 Pa
Capacity:
*60 Fixture units for Group Venting
*6 Fixture units for Stack Venting
Capacity:
*1000 Fixture units for Group Venting
*140 Fixture units for Stack Venting
•Both Valves have a lifetime warranty
•Both conform to AN/NZS4936 Australian Manufacturing Standard
Important Note
*.
Always ensure when installing any AAV that
it is an Australian Standards approved
product and has both approval and airflow
capacity (l/s) clearly marked on the body of
the valve or packaging
On the top
of the
Mini-Vent
and MaxiVent are
the
relevant
Australian
Standards
Marking
STUDOR AAV’s
• Are guaranteed for the
life of the plumbing
system to which they
are attached!
• Every Mini-Vent and
Maxi-Vent has been
tested twice before
dispatch from the
factory!
The STUDOR Mini-Vent & Maxi-Vent
•Both AAV’s share a common form of packaging
POLYSTYRENE
PACKAGING
TOP FOR
INSULATION
OUTER SLEEVE
MINI/MAXI-VENT
ADAPTER
POLYSTYRENE
PACKAGING
BOTTOM
Installation
The Mini-Vent as supplied can be installed on 3
different sizes of PVC DWV pipes:
 * 40mm: to suit basins, small sinks and baths in
Australia
 * 50mm: to suit sinks, laundry tubs etc
 * 32mm: Older plumbing systems in Australia
(and basins etc in New Zealand)
*The Mini-Vent can be installed up 1000mm
(1 metre) below the rim/flood level of the
highest fixture of the group it is venting
Installation
• Note:
The capacity of the Mini-Vent is not
limited by the pipe size it is connected
to but the total number of fixture units
it is venting.
i.e.: a Mini-Vent can be installed (via
reducers etc.) on a 80mm (or above)
DWV Waste Pipe if the total number of
fixture units doesn’t exceed 60 F.U.
Installation
The Maxi-Vent as supplied can be installed on
2 different sizes of PVC DWV pipes:
 * 80mm
 * 100mm
*When used as a group vent the Maxi-Vent
can also be installed up to1000mm (1 metre)
below the rim/flood level of the highest fixture
in the group it is venting
Group Venting
This plumbing ventilation test rig, the biggest in the
world, was built by students and staff at Gymea
TAFE in Sydney, to prove AAVs were equal to or
better than ‘Open Air Venting’ for groups of fixtures
This
entire rig
was
vented by
just 2
MiniVents
AN/NZS 3500.2.2003
•Clause 6.9 AIR ADMITTANCE VALVES
•6.9.1 Air admittance valves
•Air admittance valves complying with AS/NZS 4936 may be used in sanitary
plumbing systems for *trap vents, group vents and stack vents and to ventilate
branch drains*. They shall not be used for the upstream venting of a main drain.
•NOTE: Branches connected into a positive pressure area, such as near boundary
traps in multi storey buildings, may need additional venting.
•6.9.2 Requirements for use
•The following apply:
•(a) Air admittance valves shall be used only on *systems that have at least one
open upstream vent off the main drain. The upstream vent shall be sized in
accordance with Table 3.5 and shall be not less than DN 50.
•(b) Where more than one building on an allotment drains to the sewerage system,
the sanitary drainage system of each building shall have one open upstream vent
connected to its sanitary drain
•(c) Air admittance valves shall have a determined airflow capacity not less than
that in Table 6.6 when used as a trap vent, group vent or branch drain upstream
vent, and Table 6.7 when used as a stack vent
•.(d) An air admittance valve shall not be used as a stack vent where the stack
extends through 10 or more floor levels.
•(e) Where a sanitary plumbing system has a relief vent fitted to the stack, the relief
vent shall be extended separately to atmosphere as an open vent.
•(f) In Australia, air admittance valves that form an integral part of a fixture trap
shall only be used as a trap vent
Group Venting
(Installation)
1
2
Here we see two options;
*1. Coming off the 100 x 50 vented Pan bend,
(probably the last fixture in the group)
*2. Coming off a 100 x 50 Junction on the
common discharge pipe
Group Venting
Group
Venting
Diagram
•Relief Vent to atmosphere
•Clause 7.5.3 and 7.5.7.5.3(b)
•Alternative
Position
Clause 7.5.7.5.2 (b)
* Common
Discharge
pipes
•Clause 7.5.7.2(a)
Clause 7.5.3.
•Clause 7.5.7.5. 2
*Please note: Although group vents have been deleted, the relief vent
is still required on the stack to maintain air flow and equalize pressures
within the stack
• The relief vent should also be extended to atmosphere when the stack
is vented with a Maxi-Vent. (although in Aust. states with a Performance
Code option, Studor advises that this is deleted)
* Refer to
Australian
National
Standards
AS/NZS
3500.2.2003
Group Venting
• So , knowing that we have to use the
Table 6.6 to correctly size our AAV, we
now add up the number of fixture units in
our group and check the table.
• Let’s assume we have 6 W.C.’s
(Pan/Cistern combinations)
• i.e. 1 x W.C.= 4 Fixture Units
•
4F.U.X 6 = 24 Fixture Units
Table 6.6
Minimum Determined Airflow Capacity of Air Admittance Valves
When used as a Trap or Group Vent
Fixture Unit
loading of
discharge pipe
6
8
10
12
18
24
30
36
42
48
54
60
Min. Airflow
capacity of AAV’s
(litres per second)
1
2
2.4
2.7
3.3
3.8
4.2
4.6
5.0
5.3
5.7
6.0
The maximum capacity:
STUDOR® Mini-Vent™
7.50 l/s (or 60 FU)
STUDOR® Maxi-Vent™
32.01 l/s (or 1000 FU)
Stack Venting
• The same rule also applies to Stack Venting.
• Lets assume 6 x W.C.’s on one common
discharge pipe and 6 washbasins on the
opposite one and we have the same on 2 floors
of a multi storey building.
• 6 x 4 F.U.(24FU)
+ 6 x 1 F.U.(Washbasins)(6FU) = 30 FU
X 2 Floors
= 60FU
Let’s check the next table………..
TABLE 6.7
MINIMUM DETERMINED AIRFLOW CAPACITY OF AIR
ADMITTANCE VALVES VENTING DISCHARGE STACKS
Fixture unit loading of discharge
stack
1
2
4
6
10
12
15
20
25
30
40
60
80
100
200
300
400
500
600
1000
Minimum determined air flow
capacity of AAV, Litres per second
3
4
6
7
9
10
11
13
15
16
18
23
26
29
41
51
58
65
72
92
Stack Venting
STUDOR Maxi-Vent
With adapter
Push-fit into
100mm DWV
pipe with
adapter
Removal of adapter enables
solvent welding to 80mm DWV
Adapter allows push-fit over 80mm DWV pipe
Stack Venting
•No need to penetrate the roof!
When a Maxi-Vent is
installed in a roof
space, always allow at
least 150mm above
any insulation
Stack Venting
•When installing the Maxi-Vent
in areas that might be subject to
temperatures below 0ْ or above
60ْ , use the top half of the
foam packaging for thermal
protection ْ
•For additional physical
protection, where the valve is
installed externally, an
aluminum cap is available as an
cover over the foam packaging.
Summary
The Maxi-Vent™
The Mini-Vent™
Note
Traditionally
A stack
the saving
and
ofgroup
unnecessary
Vented
vented
vent
plumbing
plumbing
piping/fire
collars
system
system
etc
using
and
Studor
no roof
AAV’s
penetration
required
*Although not shown here, each
plumbing system/building/house etc
must have at least one open vent to
atmosphere.
In some cases this may need to be
the main stack, so a Maxi-vent might
not be used.
Mini-Vents would still be used
however for venting single fixtures
and bathroom groups
Summary
• We’ve learned that approved AAVs can be
used to vent both groups of fixtures and the
stacks usually connected to those groups as
well as how to correctly size and install them
in those situations.
• Please clarify any points with your instructor
on which you are unsure
• Your Instructor will now hand out a Q & A
sheet for you to complete.
GOOD LUCK!
Acknowledgements
STUDOR Australia would like to thank:
- the Teaching and Stores Staff under the guidance of Raymond Jones,
Senior Head Teacher of Plumbing,TAFE NSW Southern Sydney Institute,
Sutherland College (Gymea Campus)
for their support and contribution to this entire course.
- All TAFE teachers nationally
STUDOR would also like to acknowledge the continued support offered by
Plumbers Supplies Co-operative who provided the materials for this project