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TABLE 4. 4 VENT PIPE SIZE FOR VENTED SAFETY SHUT- OFF SYSTEMS

TABLE 4. 4 VENT PIPE SIZE FOR VENTED SAFETY SHUT- OFF SYSTEMS

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AS 5601 – 2000
AG 601 – 2000

56

4.7.9 Limitation for discharging a breather vent into a room or
enclosure
A breather vent is permitted to discharge into a room or enclosure when the
diameter of the breather vent orifice does not exceed the maximum value
determined by Appendix G.

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NOTES:
1 The maximum value determined by Appendix G is related to the room or enclosure
size and the gas inlet pressure to the device, and assumes an air change rate of one
room or enclosure volume per hour.
2 The limitation on the breather vent orifice diameter is related to a possible worst case
safety condition of a ruptured diaphragm (or similar membrane) separating the gas
within the device from free air outside the device. The aim of this provision is to
ensure that the accumulation of gas in a room or enclosure, as a result of diaphragm
rupture, will remain below the lower explosive limit (LEL) of the air/gas mixture.
3 Some devices, such as regulators, employ an orifice below the diaphragm, to control
gas flow, and a vent opening above the diaphragm, to permit the regulator to operate
correctly. In the event of a diaphragm rupture in these cases, ‘breather vent orifice’
means the smaller orifice through which gas escapes into a room or enclosure. Care
should therefore be taken to establish whether the internal orifice or the vent of the
device is the smaller.

4.7.10 Restriction of breather vent

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To avoid fitting a vent line to a device having a breather vent, the device may have
a vent restricting orifice fitted to it, provided –
WA 4.7.10 Appendix L

(a)

the orifice does not exceed the maximum value determined by Appendix G;

(b)

such a restriction is approved by the manufacturer of the device or their
representative; and

(c)

the orifice does not, under all operating conditions, adversely affect the
operation of the device.

4.7.11 Vent terminal location
A vent terminal shall be located where gas discharge will dissipate without entering
buildings or creating any hazard. The point of discharge shall –
(a)

be located so there is no ignition source or opening, other than in (b), into a
building within the zone shown in Figure 4.2; and

(b)

be at least 3 m from a mechanical air inlet unless calculations based on
Figure 4.2 give a greater distance; and

(c)

in cases where there is any object (eg wall, ground, etc) in the direction of
discharge and within the exclusion zone of Figure 4.2, be located at least
distance L (of Figure 4.2) in all directions.

NOTE: The requirements of this Clause do not apply to a breather vent terminal. See
Clause 4.5.2(f).

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AS 5601 – 2000
AG 601 – 2000

FIGURE 4.2 VENT TERMINAL EXCLUSION ZONE

r

Discharge

D

direction
Vent terminal
discharge point

L

Vent terminal
diameter
mm
Not exceeding 50

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Exceeding 50

Exclusion zone
L

D

r

m

m

m

1.5

1

0.5

1.5 T

T

0.5 T

NOTES:
1
2



T=

Vent terminal diameter (mm)
50

The exclusion zone shown above depicts a cylinder in the
direction of discharge and a hemisphere behind the vent terminal
discharge point.

4.7.12 Vent terminal construction
Vent terminal construction shall prevent the entry and accumulation of water (eg.
sprinkler water, rainwater etc), birds, insects or other materials which could cause
blockage.

4.7.13 Vent line to be readily removable
The vent line shall include a union near the device to be vented, unless the vent line
can otherwise be readily removed.

4.8 USE OF HOSE ASSEMBLIES
NOTE: Refer to specific appliance sections for additional requirements. For example, the
use of hose assemblies on cooking appliances.

4.8.1 Hose assembly requirements
A hose assembly shall be –
(a)

as short as practicable and, subject to the specific requirements of Sections 5
and 6, not exceed 3 m; and

(b)

of adequate diameter for the maximum gas consumption of the appliance .

NOTES:
1 Additional requirements regarding limitations on the length of hose assemblies when
used to connect appliances are detailed in Sections 5 and 6.
2 This maximum length of the hose assembly does not apply where a hose is used as
the consumer piping in a caravan or marine craft and installed in accordance with
Section 6.

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AS 5601 – 2000
AG 601 – 2000

58

4.8.2 Prohibited location of hose assembly connection point
A connection point for a hose assembly shall not be located in a –
(a)

bedroom;

(b)

bathroom;

(c)

sauna;

(d)

toilet; or

(e)

hallway.

4.8.3 Location of connection point for hose assembly
A connection point for a hose assembly shall be located –
(a)

to avoid traffic across the hose; and

(b)

where to be used for a space heater, at least 1 m from a doorway.

NOTE:

See also Clause 5.2.3

4.8.4 Hose assembly – Prohibited installation methods

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A hose assembly shall not pass –
(a)

from one room to another through a doorway fitted with a closeable door;

(b)

through a wall, portable partition, ceiling or floor;

(c)

through a fixed partition, unless the opening in the partition is large enough to
accommodate the hose and its attachments without causing damage; or

(d)

through the panel or casing of the appliance unless the appliance is
specifically manufactured to avoid damage to the hose assembly.

NOTE: This requirement does not apply where a hose assembly is used for the consumer
piping in a caravan or marine craft and is installed in accordance with Section 6.

4.8.5 Hose assembly – Operating conditions
A hose assembly shall not be installed where, under normal operating conditions, it
will be –
(a)

exposed to a temperature exceeding the maximum recommended by the hose
manufacturer;

(b)

subject to strain, abrasion, kinking or permanent deformation; or

(c)

subject to damage by vermin.

4.8.6 Hose assembly connecting an appliance
A hose assembly for an appliance shall be –
(a)

permanently connected to the appliance by a threaded or other metal
connection; and

(b)

permanently connected to the consumer piping by a threaded or other metal
connection or connected as specified in Clause 4.8.7.

4.8.7 Hose assembly connecting a portable or mobile appliance
Where a hose assembly is to be used to connect a portable or mobile appliance the
hose assembly shall –
(a)

be connected permanently to the appliance and have a manual shut-off valve
and union fitted at the inlet end of the hose assembly; or

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AS 5601 – 2000
AG 601 – 2000

(b)

be connected permanently to the appliance and have a quick-connect device
located at the inlet end of the hose assembly which automatically shuts off the
gas supply when disconnected; or

(c)

where a quick-connect device which automatically shuts off the gas supply
when disconnected is located at the appliance end of the hose assembly,
have a manual shut-off valve at the inlet end of the hose assembly.
NOTES:
1 The method in (b) is used where an appliance is to be disconnected from the gas
supply by the user: ie. a portable heater, a barbecue or where the appliance is to
be regularly disconnected for cleaning purposes.
2 The method in (c) may be used where larger appliances are to be disconnected
from the gas supply by the user: ie. for cleaning purposes around commercial
catering appliances.
3 An appliance restraint may be required, refer to Clause 5.2.18.

4.9 QUICK-CONNECT DEVICES
4.9.1 Quick-connect device installed outside

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A quick-connect device socket installed outside shall be at least 300 mm above the
ground or floor.

4.9.2 Quick-connect device
subjected to water or dust

socket

installation

method

where

A quick-connect device socket shall be installed so as to avoid entry of water, dust
or other debris.
NOTE: When installed outside, directing the outlet downward would satisfy this
requirement.

4.10 WATER AND DUST CLEARING PROVISION IN CONSUMER
PIPING
NOTES:
1 Some Authorities do not require that provision be made for the removal of water or
dust. The Authority should be consulted to ascertain whether such provision is
necessary.
2 The requirements of this Clause do not apply to LP Gas consumer piping.

4.10.1 Provision of tailpipe
Where condensation inside a pipe is likely to occur, a tailpipe (drip ) shall be
installed. The consumer piping shall be graded to fall to the tailpipe at not less than
4 mm per metre run.
NOTE: It is preferable for the consumer piping to drain to a tailpipe near the meter outlet.

4.10.2 Design and location of a tailpipe – General
A tailpipe design shall comply with all of the following:
(a)

Terminate with a plug or cap which is easily removed.

(b)

Be accessible for cleaning and emptying.

(c)

Form a trap in which an accumulation of condensate will completely fill the
tailpipe , and then shut off the flow of gas before condensate can run back into
the meter.

(d)

Be in a location where the condensate is unlikely to freeze.

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AS 5601 – 2000
AG 601 – 2000

(e)

60

Be of diameter equal to or larger than the pipe to which it is attached.
NOTE: Where the diameter of the tailpipe is greater than 25 mm, the cap or plug
fitted to the end of the tailpipe may be reduced to 25 mm.

(f)

Be of adequate capacity for the pipe draining to it.

4.10.3 Marking of tailpipes
Where there are a number of tailpipes installed in different systems in the same
premises (a block of flats or units) each tailpipe shall be clearly marked to indicate
the consumer piping to which it is connected. The marking shall be durable.

4.10.4 Requirements for a tailpipe which terminates below ground level

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A tailpipe which terminates below ground level shall comply with the following as
appropriate:
(a)

Terminate in a well constructed and drained pit made of a robust material.
The pit shall be of sufficient size to enable the plug or cap to be easily
removed.

(b)

A lid marked “GAS” shall be fitted over the pit.

(c)

For a multiple meter installation, each tailpipe is to be legibly and permanently
labelled or identified with the meter and consumer piping to which it is
connected.

4.10.5 Water clearing from pipes buried in the ground
Consumer piping buried in the ground shall –
(a)

have provision for clearing water from the piping; and

(b)

where operating at less than 7 kPa, be graded evenly and without sags to a
point where any condensate can be removed.

4.10.6 Provision for dust clearing
A riser in excess of 8 m in consumer piping supplied from an underground pipe or
reticulation system shall have accessible dust clearing provision.
NOTES:
1 The provision may be either a plugged tee or cross fitting located at the bottom of the
riser.
2 Similar clearing provision may be necessary at each change of direction in any
horizontal run where considerable dust is present in the consumer piping.

4.11 LOCATION OF CONSUMER PIPING
4.11.1 Prohibited locations
Consumer piping shall not be installed in any of the following locations:
(a)

Attached to a fence.

(b)

In a lift well.

(c)

In a clothes chute.

(d)

In a rubbish chute.

(e)

In a fire hydrant cabinet.

(f)

In a fire hose reel cabinet.

(g)

In a stair pressure duct.

(h)

In a fire-isolated stairway, passageway or ramp.
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(i)

AS 5601 – 2000
AG 601 – 2000

In a fire control room.
NOTE: Local building regulatory authorities may have additional restrictions for the
location of consumer piping. The Building Code of Australia does not allow gas pipes to
be installed in a ‘required exit’ as defined in that Code.

4.11.2 Piping not to be subject to physical damage
Consumer piping shall not be located where physical damage to the pipe is likely to
occur, unless adequate protection is provided.

4.11.3 Separation from above ground electrical conduit, wire, cable or
earthing electrode
The separation shall be at least 25 mm between any consumer piping and any
above ground –
(a)

metal electrical conduit;

(b)

metal-armoured or metal-sheathed electrical wire or cable; or

(c)

electrical earthing electrode.

4.11.4 Separation from underground electrical supply cable

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The separation between any underground consumer piping and an electrical supply
cable shall be at least –
(a)

100 mm where the electrical supply cable is indicated along its length with
orange marking tape and is provided with mechanical protection; or

(b)

300 mm where the electrical supply cable is neither indicated nor protected in
accordance with (a).

NOTES:
1 Mechanical protection is provided by any of the following: concrete slabs, continuous
concrete pour, bricks designed for protecting electrical supply cables.
2 Refer to Clause 4.11.6 for clearance from a communication cable.

4.11.5 Separation from underground electrical earthing electrode
The separation between any underground consumer piping and an electrical
earthing electrode, for an electrical supply not exceeding 1000 volts, shall be at
least 500 mm. For an electrical supply exceeding 1000 volts, the local gas
Authority shall be contacted for a ruling.

4.11.6 Separation from underground communication cable
The separation between any underground consumer piping and a communication
cable shall be at least 100 mm.

4.11.7 Separation from other underground services
The separation between any underground consumer piping and any other service
other than an electrical or communication service shall be at least –
(a)

100 mm for consumer piping not exceeding 65 mm nominal size; and

(b)

300 mm for consumer piping exceeding 65 mm nominal size.

4.11.8 Crossover of other underground services
Any underground consumer piping crossing any other service shall –
(a)

cross at an angle of not less than 45°; and

(b)

have a vertical separation of not less than 100 mm.

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AS 5601 – 2000
AG 601 – 2000

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4.11.9 Clearance from underground obstructions
Consumer piping shall be installed with sufficient clearance to any underground
obstruction to protect the consumer piping from physical damage and to permit
repairs. The clearance shall be at least –
(a)

100 mm for consumer piping not exceeding 65 mm nominal size; and

(b)

300 mm for consumer piping exceeding 65 mm nominal size.

4.11.10 Piping not to support an electrical conductor
Consumer piping shall not be used to support an electrical conductor.

4.11.11 Piping not to be exposed to liquid discharge
Consumer piping shall not be exposed to liquid discharge.

4.11.12 Above ground piping not to touch the ground
Consumer piping shall not be laid on the ground. Consumer piping above the
ground shall be at least 50 mm clear of the finished ground level.

4.11.13 Bedding and support of pipe in the ground

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Consumer piping in the ground shall be bedded on a firm compacted surface along
its entire length.

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NOTE: To satisfy this requirement it may be necessary to trim the trench base to ‘let in’
the fittings, collars or flanges to ensure the whole length of pipe is evenly supported.
WA 4.11.14 Appendix L

4.11.14 Depth of cover of pipe in the ground
Consumer piping in the ground shall have sufficient depth or be covered in such a
way to protect the pipe from physical damage. The depth of cover shall comply with
Table 4.5, except where other methods of protection are used which are acceptable
to the Authority.

TABLE 4.5
DEPTH OF COVER FOR CONSUMER PIPING
Minimum depth of cover
mm

Location

Pressure
Not exceeding 200 kPa

Exceeding 200 kPa

Lawn, path, garden

300

450

Roadway, driveway

450

600

4.11.15 Quality of bedding and backfill material
Bedding material and backfill shall –
(a)

be of a type which will not have an adverse effect on the pipe or pipe coating;
and

(b)

within 75 mm of the pipe, be free of stones or other materials which could
damage the pipe or pipe coating.

NOTE: In some ground conditions it may be necessary to use sand for bedding and
backfilling to comply with the requirements of this Clause.

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AS 5601 – 2000
AG 601 – 2000

4.11.16 Consolidation of bedding and backfill material
Bedding and backfill material shall be consolidated in a manner so as –
(a)

not to damage the consumer piping; and

(b)

to minimise subsequent trench subsidence.

4.11.17 Piping in an air duct, plenum ceiling, air handling plenum or
ventilating duct
Where consumer piping is to be in an air duct, air plenum ceiling, air handling
plenum or ventilating duct, all of the following shall apply:
(a)

The operating pressure is not to exceed 7 kPa.

(b)

Only copper pipe conforming with Table 3.1 is to be used.

(c)

Joints are to be kept to a minimum.

(d)

All joints are to be brazed.

4.11.18 Piping in a concealed location other than underground or
embedded in concrete

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Where consumer piping is to be in a concealed location, other than underground or
embedded in concrete, the requirements detailed in Table 4.6 shall apply.

TABLE 4.6
PIPING IN CONCEALED LOCATION
Operating
pressure

Up to and
including
7 kPa

Exceeding 7 kPa

Accessibility
(Note 1)

Ventilation
required
(Note 2)

Accessible

Yes

Pipes and jointing as
per Table 3.1

Inaccessible

Yes

Pipes as per Table 3.1.
All joints to be kept to a minimum

Accessible
or
Inaccessible

No

Only copper pipe as per Table 3.1.
All joints to be brazed and kept to a
minimum

Accessible

Yes

Pipes as per Table 3.1.
All joints to be either brazed or
welded and kept to a minimum

Inaccessible

Pipe materials
and jointing

Not to be installed

NOTES:
1

In this table accessible means access can be gained by, for example, a ceiling access opening or
sub-floor door except that in a multi-storey building it means able to be viewed at each floor.

2

For acceptable ventilation see Clause 4.11.21.

4.11.19 Piping beneath a building and in the ground
Where consumer piping is to be installed in the ground beneath a building all of the
following shall apply:
(a)

The piping is to be copper tube.

(b)

Joints are to be brazed.

NOTE: Refer to Table 3.1 under copper, for further installation details.

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