Miscellaneous

Question 1

Name THREE types or methods of fire-proofing a pipe penetration through a fire-cell wall.

Answer 1

• Fire collars.
• Fire wraps.
• Fire pillows.

Question 2

Give TWO permitted options for substituting components on a proprietary system.

Answer 2

• With components belonging to the same system.

* Parts permitted with the written approval of the manufacturer

Question 3

When a proprietary system is being installed, state how the product used is to be made identifiable for future alterations/additions.

Answer 3

A manufacturer’s label is to be attached adjacent to the meter or LPG cylinders.

Question 4

State the TWO situations where identification markings are required on above-ground
copper consumer piping installed in a multiple occupancy residential premises.

Answer 4

• Operating pressure exceeding 7 kPa.

* The location of the pipe is not readily identifiable as consumer piping.

Question 5

Give the maximum spacing for identification markings in a straight section of pipework for the situation

Answer 5

Spacings not more than 8 m

Question 6

Replacing a gas hob by another one of the same model… risk?

Answer 6

Low

Question 7

Installing a new gas hob in a house… risk?

Answer 7

General

Question 8

Adding a gas hob to an existing installation in a house…. risk?

Answer 8

High

Question 9

Installing a gas hob in a caravan with sleeping quarters…. risk?

Answer 9

High

Question 10

State TWO requirements that must be met when selecting pipe supports as specified in
AS/NZS 5601 Part 2.

Answer 10

• Same material as or of a material compatible with, the pipe and
• Fastened with nuts and bolts, rivets or screws.

Question 11

Name a gas appliance type which is not to be connected to a common flue which serves any other type of appliance.

Answer 11

Incinerator

Question 12

When designing a common flue, give THREE reasons why the flue connector rise would need to be increased by 300 mm.

Answer 12

• Outside the limits of Table H1.
• The diameter of the common flue is more than seven times the size of the flue connector.
• If the flue connector has more than two 90° changes of direction.

Question 13

Give the most critical operating condition that needs to be considered when designing a common flue.

Answer 13

When only one appliance is in use, particularly if the gas consumption is low.

Question 14

List FOUR locations where pressure test points are required on an installation.

Answer 14

page 78

Question 15

An installation with pressures exceeding 7 kPa is fitted with a pressure test point.
State the special feature that the pressure test point must have.

Answer 15

Test points must be self-sealing type

Question 16

State the purpose of the reversion fittings.

Answer 16

To permit future extension or connection with non-compatible materials.

Question 17

Describe TWO acceptable reversion fittings suitable for the installation

Answer 17

BSPT (British Standard Pipe Thread) fitting between two multilayer/threaded adapters.

Standard annealed copper tube between two multilayer/threaded adapters.

Question 18

State the special requirement that must be met with regard to identification of the pipe in the proprietary system installation.

Answer 18

A lable shall be attched to the gas meter orlpg cyclinders indicating the make of the proprietary system

Question 19

5 m of 150 mm ID consumer gas piping is to be isolated for hot work to be carried out.
State what is recommended good practice for completing the hot work once the section has been
fully isolated from the existing gas supply.

Answer 19

Purge the installation with an inert gas.
• Purge the pipe to outside atmosphere.
• Purge 6 m away from ignition sources.
• Purge well clear of any openings into buildings.
• Continuously check air/gas ratios using a calibrated gas detector to indicate when the purge
is complete.

Question 20

A 100 mm galvanised gas dryer vent is being installed, and is to penetrate the external wall of a wooden framed house with brick cladding.
List the steps required to ensure that the penetration is weather tight.

Answer 20

• Cut building wrap to suit pipe.
• Install duct inclined downwards to outside.
• Seal penetration of building wrap to pipe with flashing tape.
• Seal cladding to pipe using suitable sealant.