Section 4 Fully Vented System - npstag.com · A fully vent modified sanitary plumbing system...

STUDENT NOTES CPCPSN4011A Plan, size and layout sanitary pipe work and fixtures

© 2012 TAFE NSW Section 4-1

4. SANITARY PLUMBING FULLY VENTED SYSTEM On completion of this module, the student should be able to: Design, install and develop bills of quantities for a fully vented modified system for commercial and industrial premises of over SIX (6) floor levels or more.

Assessment Criteria 4.1 Describe and design fully vented sanitary plumbing systems for commercial

and industrial premises to meet the requirements of the Building Code of Australia, Plumbing Code of Australia and AS/NZS 3500.

4.2 Describe, design, install and develop bills of quantities for fully vented

modified sanitary plumbing systems for domestic, commercial and industrial premises to meet the requirements of the Building Code of Australia, Plumbing Code of Australia and AS/NZS 3500.

4.3 Interpret various designs of sanitary plumbing systems for commercial and

industrial premises of over SIX (6) floor levels and develop bills of quantities for these designs.

Assessment Method may include

• Written assessment based on assessment criteria.

• Practical activities based on assessment criteria.

• Designs based on assessment criteria.

• Assignment based on assessment criteria



4.1 Describe and design fully vented sanitary plumbing systems for commercial and industrial premises to meet the requirements of the Building Code of Australia, Plumbing Code of Australia and AS/NZS 3500.

Fully Vented System

Refer AS/NZS 3500.2 Section 7 The fully vented sanitary plumbing system (as shown in Figure 4.1) is a system comprising the ventilation of every individual fixture trap and floor waste gully` by means of a trap vent or air admittance valve. Trapped fixtures connected to a floor waste gully are not vented and the discharge pipe must be within the specified distance. The system also incorporates a relief vent/s (see AS/NZS 3500.2) and cross-relief vent/s (see Clause 7.5.5) or pressure attenuators in accordance with the fixture unit loadings as outlined within AS/NZS 3500.2 Tables 7.1 and 7.2. This system is very rarely used these days and you need to make an application to the local drainage authority for permission to install them. The following types of vent/s (or air admittance valves as per AS/NZS 3500.2) are used within the system to maintain a constant atmospheric pressure on the outlets of the trap water seals and the removal of foul odours and gases, preventing a build up of pressure or the creation of a vacuum.

• Stack Vent

• Header Vent

• Relief Vent

• Pressure attenuator

• Cross-relief Vent

• Terminal Vent

• Trap Vent

• Common Vent

• Branch Vent

• Air admittance valve



Stack

Sanitary Drainage

Stack Vent

Header Vent

Fixture Pair

Relief Vent

Stack

FW

Indirect Connected Fixture

Fixtures Back to Back

Common Vent

Relief Vent

Stack Vent

Trap Vent

Cross Vent

Relief Vent

Common Discharge Pipe

Group Vent

Group Vent

Fixture Discharge Pipe



Trap Vent


Gully

Branch Drain

Trap Vent

Terminal Vent



Fig. 4.1 Fully Vented System

NOT TO SCALE



Fully Vented Modified System

Refer AS/NZS 3500.2. This section outlines the design requirements and installation methods for the fully vented and fully vented modified systems of sanitary plumbing. Students are encouraged to read AS/NZS 3500.2 Section 7. A fully vent modified sanitary plumbing system differs from the Fully Vented System. Individual fixture trap vents or air admittance valves are omitted and two or more fixtures discharging to the same common graded discharge pipe or branch are vented by means of one or more group and or branch vent/s or air admittance valve/s as shown in figure 4.2. Every graded discharge pipe connected to the stack must be vented by at least one vent or air admittance valve except the uppermost branch to the stack providing it is within distance. The following types of vent/s (or air admittance valves as per AS/NZS 3500.2) are used within the system to maintain a constant atmospheric pressure on the outlets of the trap water seals and the removal of foul odours and gases, preventing a build up of pressure or the creation of a vacuum.

• Stack Vent

• Header Vent

• Relief Vent

• Pressure attenuator

• Cross-relief Vent

• Terminal Vent

• Trap Vent

• Common Vent

• Branch Vent

• Air admittance valve

Sizing of Stack The size of the stack is determined by the fixture unit loading of all the fixtures connected to it and the developed length of its vent.

Develop Length

Refer AS/NZS 3500.2

The develop length of a stack vent is:

a) for stacks with relief vents, the length of the relief vent; or

b) for stacks without relief vents, the length of the stack vent and the stack

to the point of connection of the lowest branch.



Stack

Sanitary Drainage

Stack Vent

Header Vent

Fixture Pair

Relief Vent

Stack

FW

Indirect Connected Fixture

Fixtures Back to Back

Common Vent

Relief Vent

Stack Vent

Trap Vent

Cross Vent

Relief Vent


Group Vent

Group Vent




Trap Vent


Gully

Branch Drain

Trap Vent

Terminal Vent



Fig. 4.2 Fully Vented Modified System

NOT TO SCALE



METHOD OF CALCULATION FOR STACK SIZE a) Calculate the total number of fixture units from all fixtures connected to the

stack as given within AS/NZS 3500.2 Table 6.1 b) Size the stack according to:

i) Table 7.2 (a) for stacks of 4 or more floor levels;

ii) Table 7.2 (b) for stacks three or fewer floor levels.

Using AS/NZS3500.2 students are to complete the table below

TABLE 7.2 MAXIMUM LOADING ON STACKS IN FIXTURE UNITS

Size of stack DN

Maximum loading per floor level

Maximum loading per stack

(a) Four or more floor levels

40

50

65

80

100

125

150

225

(b) Three or fewer floor levels

40

50

65

80

100

125

150

225



Example: A stack five (5) storeys high has 30 water closets, 16 wall-hung urinals, 5 baths, 10 showers, 18 hand basins and 5 domestic kitchen sinks. Using AS/NZS3500.2 students are to complete the table below

Fixture Number Fixture Units Sub Total Water Closets 30 Wall-hung urinals 16 Baths 5 Showers 10 Basins 18 Domestic Kitchen Sinks

5

Stack Total (F.U) = a) a total of F.U’s are connected to the stack;

b) determine if the stack is above four (4) floors Number of floors = c) using AS/NZS 3500.2 Table 7.2 (b) determine the size of the stack.

Size of stack DN

Maximum loading per floor level

Maximum loading per stack

(a) Four or more floor levels

40 50 65

80

125

150 225

4 9

14

20

250

600 1 750

16 36 56

80

1 000

2 400 7 000

Note: The maximum fixture unit loading per floor is not to be exceeded.

Refer AS/.NZS 3500.2.

• Four (4) floors or more = 25% of stack loading.

• Three (3) floors of less = 33% of stack loading. Where the fixture unit loading at any one floor level exceeds the maximum loading permitted in Table 7.2 (a) or Table 7.2 (b), the stack shall be increased in size.



Where a DN 80 stack is installed as a fully vented modified system, the maximum number of water closet pans and slop hoppers connected to any graded pipe or branch shall not exceed two.

Student Exercise No 1

Students are required to size the stack shown in schematic view below; flush valves operate all water closet pans.

Fig. 4.3 Student Exercise

Second floor fixture unit loading

First floor fixture unit loading

Total

Stack Size = DN

NOT TO SCALE



Student Exercise No 2 Students are required to size the stack shown in schematic view below, all water closet pans are cistern flush.

S

S

S

B B B

wc wc wc wc wc wcShr Shr

WC WCFW

BB

WC WC WC WC

WC WC WC WCFW

B B B B

WCWCWC

BBB

1st Floor

2nd Floor

3rd Floor

4th Floor

5th Floor

FW FW

B

CS Shr Shr Shr Shr

FW


Fixture unit loading

Stack Size = DN

NOT TO SCALE



Student Exercise No 3 Students are required to size the stack shown in schematic view below, all water closet pans are cistern flush.

1st Floor

WCWCWC

BBB

FW

S

2nd Floor

Bth FW Shr

B

WC WC

3rd Floor

B B B B

FW

S

WC WC WC


Fixture unit loading

Stack Size = DN

NOT TO SCALE



SIZING FIXTURE DISCHARGE PIPES As covered within Learning Outcome 7, fixture discharge pipes are sized from AS/NZS 3500.2 Table 6.1 (Fixture Unit Ratings). The sizing of graded discharge pipes to one fixture is determined from AS/NZS 3500.2 Table 6.1 (Fixture Unit Ratings) and must not be smaller than the trap to which they are connected, except in the case of water closet pans and slop hoppers, which may be connected to DN 80 common (graded) discharge pipes. Only two water closet pans shall be connected to any DN 80 discharge pipe.

COMMON (GRADED) DISCHARGE PIPES The sizing of common (graded) discharge pipes connecting two or more fixture discharge pipes must not be smaller than the trap to which they are connected, except in the case of water closet pans and slop hoppers, which may be connected to DN 80 discharge pipes. It may vary in size along its length and is sized taking into account:

a) the sum of the fixture units that it carries (see Table 6.1 and 6.2); and b) the proposed pipe grade.


TABLE 6.3 MINIMUM GRADES OF DISCHARGE PIPES

Size of graded section of pipes DN

Minimum grade %

40

50

65

80

100

125

150

225

300



TABLE 7.1 MAXIMUM FIXTURE UNIT LOADINGS FOR GRADED DISCHARGE PIPES

Grade Nominal size of pipe, DN % 40 50 65 80 100 125 150 225

5.00 3.35 2.50

2.00 1.65 1.25

1.00

6 5 4

X X X

X

15 10 8

X X X

X

51 29 21

X X X

X

65 39 27

20 16 X

X

376 248 182

142 115 X

X

953 686 509

410 342 254

X

1 959 1 445 1 148

953 813 627

509

7 098 5 583 4 513

3 739 3 258 2 656

2 272 Note X = means not permitted

CONNECTION TO COMMON DISCHARGE PIE

Refer AS/NZS 3500.2. (b) Graded discharge pipes of different sizes shall be connected so that the soffits

of both pipes are in common alignment. (c) The invert level of a trap or floor waste gully weir shall be a minimum of 10 mm

higher than the soffit of the graded discharge pipe to which it connects (see Figure 6.2.

DN 65

DN 50DN 40SOFFIT

NOT TO SCALE

Fig. 4.6 Soffit (common) alignment of pipes



Example: A common (graded) discharge pipe has 5 water closets (cistern flush), 1 x 2.6 m urinal, 1 cleaners sink, 1 shower, 2 hand basins and 1 domestic kitchen sink; the pipes are to be graded as per Table 6.3.

Fig. 4.7 Example

NOT TO SCALE



Student Exercise No 4 Students are required to SIZE the common (graded) discharge pipes as shown in schematic view below, all water closet pans are CISTERN FLUSH.


NOT TO SCALE



Student Exercise No 5 Students are required to SIZE the common (graded) discharge pipes as shown in schematic view below, all water closet pans are CISTERN FLUSH.


NOT TO SCALE



Student Exercise No 6 Students are required to size the common (graded) discharge pipes as shown in schematic view below, all water closet pans are cistern flush.


NOT TO SCALE



STACK VENT

Refer AS/NZS 3500.2. A stack vent is the continuation of the stack above the highest branch; it may extend separately to atmosphere or interconnect with the relief vent above the overflow level of the highest fixture connected. Stack and Relief vents are sized using AS/NZS 3500.2 Table 7.5 and the following:

a) the sum of the fixture units that discharge into the stack (see Table 6.1 and 6.2); and

b) the size of the stack. c) the developed length of the vent The developed length of a stack vent is:

• for stacks with relief vents, the length of the relief vent; or

• for stacks without relief vents, the length of the stack vent and the stack to the point of connection of the lowest branch.



TABLE 7.5 SIZE OF RELIEF VENTS AND STACK VENTS

Size of

stack

Maximum

fixture units

Maximum develop length of vent, m

connected Required vent size, DN DN 32 40 50 65 80 100 125 150 40 50 50

65 65 80 80

100 100 100

125 125 125

150 150 150

225 225 225

16 20 36

20 56 20 80

150 300 500

300 750

1 100

700 1 300 2 400

1 700 4 000 7 000

6 8 6

15 15 10

12 7 8

46 30

40 24 27 12

9 8 6

110 80 70 20

25 22 19

9 7 6

4

170 110

70 60 50

22 19 14

9 7 6

280 216 197

95 72 62

37 30 24

280 230 190

155 130 100

16 14 6

300 250 200

62 43 31

RELIEF VENT

Refer AS/NZS 3500.2. A relief vent is used to relieve pressure and/or vacuum conditions within the stack. It is usually fitted adjacent to the stack and they are required where: a) One or more floors separate the floor levels of the highest and lowest branch

pipes connected (see Fig 4.11).

c) For stacks with offsets, if disregarding the offset, one or more floors separate the floor levels of the highest and lowest branch pipes connected

d) (see Fig 4.11).



It connects with the stack below the lowest fixture, at an angle of 45° and extends upwards at a minimum grade of 1.25%, interconnecting with the stack vent above the spill level of the highest fixture, or extending to open air and terminating in accordance with Clause 6.8.4. Stack and relief vent/s may also interconnect at their upmost point into a common header vent terminating at one point. The sizing of the relief vent is the same as for the sizing of stack vents using AS/NZS 3500.2 Table 7.5

Highest connection

Lowest connection

Stack vent

Relief vent Stack

Min. grade 1.25%Relief ventinterconnecting

with stack vent

above highest

fixture overflowlevel

Alternative

relief vent

terminates

separately

Highest

connection

Lowest connection

45° connection

Alternative

relief vent

terminates separately

45° connection

Relief vent required on lowervertical section of stack only

Alternative arrangement

for relief vent

Min. grade 1.25%Stack vent

Fig. 4.11 Relief Vent installation for straight stacks

NOT TO SCALE



45° connection

Stack vent

Min. grade 1.25%

45° connection

Alternative

relief vent

terminates

separately

Aternative arrangement

for relief ventRelief vent required

on both vertical

of stack

Relief vent required

on both vertical

of stack

Fig. 4.12 Relief Vent installation for graded offsets

PRESSURE ATTENUATORS Pressure attenuators may be used in sanitary plumbing systems as an alternative to relief venting. Attenuators are used to counter the tendency for the loss of trap water seals resulting from positive pressure pulses in discharge stacks. Positive pressure pulses or transients arise from disruptions to airflow produced at changes in direction or restriction to the airflow path. The size of the pressure attenuator is independent of stack size and fixture unit loading the manufactures advice may need to be obtained.

Installation requirements Pressure attenuators shall be— (a) connected to stacks by means of 45° or sweep junctions; (b) positioned above the point of connection in either a vertical or horizontal

orientation and

NOT TO SCALE



(c) adequately supported with allowance for thermal movement. Connections to the stack, other than those immediately above the base of the stack or offset, shall be above the branch discharge pipes at that floor level

Fig. 4.13 Typical connection of pressure attenuators to stacks

Fig. 4.14 Examples of typical pressure attenuators installation

Students are encouraged to read AS/NZS3500.2 to obtain a fuller understanding of the installation for pressure attenuators



HEADER VENTS

Refer AS/NZS 3500.2. A header vent may be used to interconnect the tops of two or more stack or relief vents, allowing a single vent termination. This is used to reduce the number of penetrations through the roof.

SIZING Header vents are sized in accordance with the following: a) determine the number of DN 50 vents that are equivalent to each individual

stack or relief vent/s interconnecting with the header vent, using AS/NZS 3500.2 Table 7.6.

b) add together all such numbers c) note from Table 7.6 the size of a single equivalent header vent.

d) where a stack has a relief vent, take into account the relief vent size only. e) any change in size of the graded header vent is made downstream and

adjacent to the junction. f) header vents need not be larger than DN 300. Using AS/NZS3500.2 students are to complete the table below

TABLE 7.6 SIZE OF HEADER VENTS

Size of stack vent or relief vent

DN

Equivalent number of DN 50 vents

Size of header vent DN

50

65

80

100

125

150

250

300



Terminal vent

Stach vent

Relief vent

Header vent

Stach ventStach ventStach vent

Relief

ventRelief

ventRelief vent

Fig. 4.15 Header Vent

NOT TO SCALE




Students are required to size the header vent as shown in schematic view below, the

stack is a fully vented modified system with a develop length of 20 m.

Fig. 4.16 Student Exercise NOT TO SCALE

Section Number of DN 50 equivalents

Header vent size DN

A – B B – C C – D D - E



CROSS-RELIEF VENTS Cross-relief vents are required on any stack that extends 20 or more floors in height. Cross-relief vents must be evenly spaced so that the intervals do not exceed 10 floor levels.

Cross-relief vents connect to the stack at an angle of 45° below the lowest branch connecting to the stack at the floor concerned and connect with the relief vent above the flood level rim of the lowest fixture, discharging into the stack at that floor. The cross-relief vents are to be the same size as the relief vent or stack vent which ever is the smaller.

B B

S

FW

Trap vent or

air admittancevalve

Trap vent or

air admittance

valve

Min. grade 1.25%StackRelief vent

45° connection

Cross-relief vent

Min. grade 1.25%

NOT TO SCALE

Fig. 4.17 Installation of Cross-Relief Vent



Sanitary Drain45° connection

1 st Floor

4th Floor

3rd Floor

2nd Floor Group vent or

air admittance

valve

5th Floor

6th Floor

7th Floor

8th Floor

9th Floor

10th Floor

11th Floor

12th Floor

13th Floor

14th Floor

15th Floor

19th Floor

18th Floor

17th Floor

16th Floor

20th Floor

45° connection

Highest graded pipe

or branch connection

to stack

Max.10th floor

level between

Cross-relief vents

Cross-relief vent not

required untill stack

exceeds 20 floor levels

Trap vent or

air admittancevalve

Cross-relief vent

Fig. 4.18 Installation of Cross-Relief Vent

NOT TO SCALE



STACK OFFSETS

STEEP

Refer AS/NZS 3500.2 Clause 7.6.1

A steep offset has angles more than 45° to the horizontal and is considered to be a STRAIGHT STACK. The stack is sized using AS/NZS 3500.2 Table 7.2 (a) and (b). Only one (1) relief vent is required, there is no need to provide a relief for the section of stack below the offset and another for the section above.

Alternativearrangement

for relief vent

Min. grade 1.25%

Stack vent

45° connection

Angle more than 45°

NOT TO SCALE

Fig. 4.19 Steep offset



GRADED

Refer AS/NZS 3500.2.

A stack offset is considered to be graded if its angle is less than 45° to the horizontal.

45° connection

Stack vent

Min. grade 1.25%

45° connection

Alternative

relief vent

terminates

separately

Aternative arrangement

for relief ventRelief vent required

on both vertical

of stack

Relief vent required

on both vertical

of stack

Fig. 4.20 Graded offset

NOT TO SCALE



MINIMUM GRADE

Refer AS/NZS 3500.2 Table 7.8 The minimum grade of a graded offset shall be:


TABLE 7.8

MINIMUM GRADE OF OFFSET Size of grade section

DN Min. gradient

% <80

100

125

150 225 300

0.60 0.40

SIZING a) the entire stack must firstly be sized as if straight using AS/NZS 3500.2 Table

7.2 (a) or (b). b) the graded offset section is sized as a graded discharge pipe using

AS/NZS 3500.2 Table 7.1; only consider the fixture units above the offset. The grade of the offset as given in Table 7.8 above and has to be considered. c) the size of the entire stack taken from the drainage connection point to above

the highest connection is then taken to be whichever is the larger size, (a) or (b) above. The stack and relief vents are sized from AS/NZS 3500.2 Table 7.5.

CONNECTION ABOVE A GRADED OFFSET No connection shall be made: a) within 600 mm of the upper bend for stacks not exceeding five (5) floors above

the offset; b) within 1 m of the upper bend for stacks exceeding five (5) floors above the

offset; c) within 2.5 m, when foaming is likely to occur.



CONNECTION WITHIN A GRADED OFFSETS No connection shall be made: a) within 2.5 m of the upper bend; and

b) within 450 mm of the lower bend.

CONNECTION BELOW A GRADED OFFSETS No connection shall be made: a) within 600 mm of the lower bend.

450 mm min.

600 mm min.

Alternative connection

for lowest branch

2500 mm min.

2nd Floor

3rd Floor

No connection within

this zone

No connection within

this zone

600 mm (5 or less floors)

1 m (6 or more floors)

Alternative connection

for above graded offset

1st Floor

Fig. 4.21 Connection within offset area

NOT TO SCALE




Students are required to size the stack, graded section, relief vent and stack vent as shown in schematic view below:

• all water closet pans are cistern flush;

• the stack has a develop length of 18 m;


Fixture Unit loading Stack vent DN Relief vent DN Stack DN Graded Offset DN

NOT TO SCALE



VENTING OF COMMON (GRADED) DISCHARGE PIPES The following vents are used to eliminate pressure build up and vacuum conditions within graded discharge pipes for the prevention of loss of water seal/s.

TRAP VENT Trap vents are used to vent an individual trap to open air or interconnect with a branch vent, relief vent or stack vent. Air admittance may be used instead of a trap vent as outlined within AS/NZS 3500.2. Every trap vent shall be extended upwards to a point above the flood level rim of the fixture before interconnecting with another vent.

StackRelief vent

100 mm min rise

INSERT N.T.S

Min. 100 mm rise

Trap vent orair admittance

valve

Trap vent or

air admittance

valve

Fig. 4.23 Trap Vent

Trap vents are sized off the fixture discharge trap and pipe to which they are connected:

TABLE 7.3 MINIMUM SIZE OF TRAP VENTS

Size of fixture trap DN

Size of trap vent DN

40

<50 to <100

32

40

NOT TO SCALE



GROUP VENT A group vent is connected to common (graded) discharge pipe, venting a group of fixtures. One group vent is required for each 10 fixtures, or part thereof, in any group connected to a common discharge pipe. The first group vent is connected up stream in the same location as for a trap vent or common vent, if other group vents are required they shall be connected to the common discharge pipe at approximately equal distances, so as no group vent serves more than ten (10) fixture branches or part there of. Group vents are sized off the common discharge pipes they serve. If the common discharge pipe varies in size, the group vent shall be sized off the largest section of the common discharge pipe they serve. At no time shall the group vent be larger than the common discharge pipe, if this occurs increase the common discharge pipe to the same size as the vent. Using AS/NZS3500.2 complete the table below

TABLE 7.7 SIZE GROUP VENTS

Size of common discharge pipe

DN

Size of single group vent DN

40

50

65

80

100

Common (graded) discharge pipes may have a vertical dropper not exceeding 1.5 m. Where such a dropper is used and there are fixtures connected to the downstream section a group vent must be provided.

i) from the top of the vertical drop

ii) between the vertical drop and the first downstream fixture discharge pipe

iii) from the first downstream fixture discharge pipe



Group ventalternative

positions

Drop 1500 mm max.

Group vent

Branch Vent Group venting of

vertical dropper

alternative positions

Venting of discharge pipe

due to over distance or

more than one fixture

discharge pipe connected Vent connection

within 1.5 m from

weir of trap

S

S

WC

Vent interconnection above

flood level rim of highestfixture connected to commongraded discharge pipe

Air admittance valves maybe used to replace trap orgroup vents. Refer AS/NZS 3500.2 Clause 6.9

Discharge pipe

increased from DN 40 - 50 to

service the vent

B

B

Min. grade 1.25%

Vent connection

within 600 mm for

a basin/bidet and1.5 m for other

fixtures from

weir of trap

Fig. 4.24 Venting of Common Discharge Pipe

Connecting vents to a graded or common discharge pipe

When connecting a vent or Air Admittance Valve (AAV) to a graded or common discharge pipe, it must meet the requirements of AS/NZS 3500.2. a) In the case of basins and bidets, the vent/AAV shall be connected no closer

than 75 mm and no further than 600 mm from the crown of the fixture trap, provided no change of direction occurs between the trap and the vent/AAV.

b) In the case of fixtures other than basins and bidets, the vent/AAV shall be

connected between 75 mm and 1.5 m, provided that where an S-trap or a bend is fitted downstream of a P-trap, the vent/AAV connected on the vertical discharge pipe shall be at least 300 mm from any bend at the base of the vertical section.

NOT TO SCALE



300 mm min.

1.5 m max.

75 mm

A

B

Connect vent/AAV within either Section A or B

P-trap or S-trapNo connectionspermitted withinthis distance

Connect vent/AAVwithin this length

75 mm no connectionspermitted within

this distance

600 mm for basins/bidets

1.5 m for other fixtures

No connectionspermitted withinthis distance

Fig. 4.25 Connection of vents/AAV to Graded or Common Discharge Pipes

BRANCH VENT

A branch vent may interconnect with the relief or stack vent or may extend to open air and terminate in accordance with the requirements of AS/NZS 3500.

The point of interconnection between a branch vent and any other vent connected to a graded or common discharge pipe is above the flood level rim of the highest fixture connected to the graded or common discharge pipe.


TABLE 7.4 MINIMUM SIZE OF BRANCH VENTS

Size of branch discharge pipe DN

Size of branch vent DN

40

50

65

80

100

150

NOT TO SCALE



Student Exercise No 10 Students are required to complete the design showing the position, type and size of vents required for the system shown in schematic view below, all water closet pans are cistern flush.


NOT TO SCALE



Student Exercise No 11 Students are required to complete the design showing the position, type and size of vents required for the system shown in schematic view below, all water closet pans are cistern flush.


NOT TO SCALE



Student Exercise No 12 Students are required to complete the design showing the position and capacity of air admittance valves (trap and group vents only) for the system shown in schematic view below, all water closet pans are cistern flush.


NOT TO SCALE



Student Exercise No 13 Students are required to complete the design showing the position and capacity of air admittance valves (trap and group vents only) for the system shown in schematic view below, all water closet pans are cistern flush.


NOT TO SCALE

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