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LisaS

February 11, 2009, 09:19:39 AM
QUESTION 1
(a)   To comply with NZS 3604, state THREE conditions that determine the position and size of
a hole to be drilled through a wooden floor joist for a gas pipe.
1
 
2

3


(3 marks)
(b)   To comply with NZS 5261, state SIX conditions that must be met when a gas pipe is
embedded directly within a concrete floor slab.
1
 
2

3

4

5

6


(6 marks)

( c)   To comply with NZS 5261, state THREE requirements for an underground gas pipe that
passes through the outer wall of a building. 
1
2
3
(3 marks)
(d)   List FOUR types of fittings that are unsuitable for joining gas installation pipes, as specified
in NZS 5261.
1
2
3
4
(2 marks)
(e)   Why must the gas velocity be restricted in gas pipework?
 


(1 mark)
Total 15 marks


Linkback: https://forum.plumbers.nz/gas-exam-june-2007/21/question-1/131/
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Plumber

#1
February 20, 2009, 03:09:58 PM
Question 1 (a)

1. Be within the middle third of the depth of the joist;
2. Be of a diameter not exceeding 20% of the joist depth or 32mm
3. Be not more than three times the depth of the joist from the face of the support.
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Please note that the advice I am giving is only my opinion and not necessarily a fact.  Please refer to our terms and conditions.

Plumber

#2
February 20, 2009, 03:20:11 PM
Question 1 (b)

1. The operating pressure shall not exceed 7 Kpa
2. The amount of cover shall be adequate for the particular application
3. The piping shall be plastic-coated or covered in a proprietary wrapping
4. Joints and fittings shall be kept to a minimum and be brazed and then covered in a proprietary wrapping
5. Piping shall be placed so that cutting, bending or displacement of any reinforcement from its proper location is not necessary
6. Piping in a floor shall be placed between the top and bottom reinforcement
7. The size of piping shall not reduce the design strength of the concrete slab
8. Piping shall not extend through expansion joints in the concrete   
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Plumber

#3
February 20, 2009, 03:31:29 PM
Question 1 (c)

1. Be protected against corrosion
2. Be sealed at the wall to prevent entry of gas into the building in the case of leakage of gas outside the building
3. Not to be subjected to any load from the building
4. Where piping penetrates a vapour barrier the integrity of the vapour barrier shall be maintained
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Plumber

#4
February 20, 2009, 03:39:05 PM
Question 1 (d)

1. Croxed joints
2. Plain nipples, e.g. running nipple with parallel threads
3. Compression fittings with non-metallic olives
4. Compression fittings with metallic olives if not approved by the manufacturer for use with gas
5. Longscrew connectors
6. Internally threaded PVC-U fittings unless manufactured with a reinforcing metal band.
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Plumber

#5
February 20, 2009, 03:43:14 PM
Question 1 (e)

1. To prevent internal erosion of the pipework
2. To prevent excessive noise from pipework
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