Tightness Testing And Purging – Flashcards

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What is A Tightness Test
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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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Test Equipment Used
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.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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Installation Volume
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IV=IVm+IVp+IVf
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IGEM/UP/1B Edition 3
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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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Tightness Test
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Uses pressure decay as an indicator to the integrity of an installation.
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Purge Volume
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(PV)m3=1.5x(IV)m3
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Water Gauge
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Must be capable of reading to at least
0.5mbar
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Electronic Gauge
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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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0.25mbar
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No perceptible movement
for an electronic gauge
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0.2mbar
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A M.P Let by Test
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Carried out between
7 and 10mb
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A M.P Tightness Test
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Carried out between
18 and 19mb
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Tightness Test Duration
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2 Minutes
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L.P Let by Test
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Carried out between
7mb and 10mb
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L.P Tightness Test
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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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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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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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Pressure drop does NOT exceed values in table And No smell of Gas.
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Tightness Test
<28mm pipe
E6 Meter<6m3>
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8mb
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Tightness Test
<28mm pipe
U6/G4 meter < 6m3/h
pressure drop is..?
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4mb
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Tightness Test
<28mm
U16/G10
>6m3/h <16m3>pressure drop is ?
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1mb
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Tightness Test
>28mm <35mm
E6 Meter<6m3>PRESSURE DROP IS..?
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4mb
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Tightness Test
>28mm <35mm pipe bore
U6/G4 meter < 6m3/h
PRESSURE DROP IS..?
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2.5mb
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Tightness Test
>28mm <35MM
U16/G10
>6m3/h <16m3>pressure drop is ?
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1mb
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Diaphragm U6/G4
Purge volume for
28mm
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0.01m3
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Ultrasonic E6 meter
Purge volume for
28mm
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0.01m3
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Diaphragm U16/G10
Purge volume
<28mm >28mm
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1.5 x IVm3
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Diaphragm U6/G4
Purge volume for
>28mm
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1.5 x IV m3
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Ultrasonic E6
Purge volume for
>28mm
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1.5 x IV m3
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