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Definition
Impractical and time consuming to test all joints,pipes and connections.
.a localised test to prove the integrity of an installation
.Performed from a single point on the installation,normally at primary meter.
.Uses pressure decay as an indicator to the integrity of an installation.
Pressurise a gas system and isolate the pressure source.
provided there is no leakage of gas.
the pressure will remain constant over a calculated period of time.
If gas leak is present,the pressure within the system would start to decay.
Pressure decay is recognised by a pressure drop on the gauge relative to the severity of the leak. |
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Definition
.Pressure Gauge-either water or electronic.
.Testing Tee (where required if testing with air).
Aspirator to pressurise the system where air is used as the test medium. |
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Definition
Any gas installation with LPG/Air,Natural Gas or LPG where the MOP does not exceed 2bar
Pipework upto 35mm
U16/G10 Meters
Max badged capacity does not exceed 16m3/h |
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Definition
| Uses pressure decay as an indicator to the integrity of an installation. |
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Must be capable of reading to at least
0.5mbar |
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Definition
| Must be capable of being read to at least 0.1mbar |
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No Perceptible Movement
for a water gauge |
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No perceptible movement
for an electronic gauge |
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Carried out between
7 and 10mb |
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Carried out between
18 and 19mb |
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Definition
Carried out between
7mb and 10mb |
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Definition
Carried out between
20 and 21mb |
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Tightness Test
New Installations(with or without appliances connected)
will pass if? |
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Definition
| No Perceptible Movement and no smell of gas |
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Tightness Test
Existing with NO appliances connected(i.e pipework only)
will pass if? |
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Definition
| No Perceptible Movement and no smell of gas |
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Tightness Test
Existing WITH appliances connected
will pass if? |
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Definition
| Pressure drop does NOT exceed values in table And No smell of Gas. |
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Tightness Test
<28mm Pipe
E6 Meter<6m3/h or no meter |
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Definition
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Tightness Test
<28mm pipe
U6/G4 meter < 6m3/h
pressure drop is..? |
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Definition
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Tightness Test
<28mm
U16/G10
>6m3/h <16m3/h
pressure drop is ? |
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Definition
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Tightness Test
>28mm <35mm
E6 Meter<6m3/h or no meter
PRESSURE DROP IS..? |
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Definition
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Tightness Test
>28mm <35mm pipe bore
U6/G4 meter < 6m3/h
PRESSURE DROP IS..? |
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Definition
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Tightness Test
>28mm <35MM
U16/G10
>6m3/h <16m3/h
pressure drop is ? |
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Definition
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Term
Diaphragm U6/G4
Purge volume for
28mm |
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Ultrasonic E6 meter
Purge volume for
28mm |
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Diaphragm U16/G10
Purge volume
<28mm >28mm |
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Definition
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Diaphragm U6/G4
Purge volume for
>28mm |
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Ultrasonic E6
Purge volume for
>28mm |
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Definition
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