Tightness Testing And Purging – Flashcards
Unlock all answers in this set
Unlock answersquestion
| What is A Tightness Test |
answer
| 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. |
question
| Test Equipment Used |
answer
| .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. |
question
| Installation Volume |
answer
| IV=IVm+IVp+IVf |
question
| IGEM/UP/1B Edition 3 |
answer
| 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 |
question
| Tightness Test |
answer
| Uses pressure decay as an indicator to the integrity of an installation. |
question
| Purge Volume |
answer
| (PV)m3=1.5x(IV)m3 |
question
| Water Gauge |
answer
| Must be capable of reading to at least 0.5mbar |
question
| Electronic Gauge |
answer
| Must be capable of being read to at least 0.1mbar |
question
| No Perceptible Movement for a water gauge |
answer
| 0.25mbar |
question
| No perceptible movement for an electronic gauge |
answer
| 0.2mbar |
question
| A M.P Let by Test |
answer
| Carried out between 7 and 10mb |
question
| A M.P Tightness Test |
answer
| Carried out between 18 and 19mb |
question
| Tightness Test Duration |
answer
| 2 Minutes |
question
| L.P Let by Test |
answer
| Carried out between 7mb and 10mb |
question
| L.P Tightness Test |
answer
| Carried out between 20 and 21mb |
question
| Tightness Test New Installations(with or without appliances connected) will pass if? |
answer
| No Perceptible Movement and no smell of gas |
question
| Tightness Test Existing with NO appliances connected(i.e pipework only) will pass if? |
answer
| No Perceptible Movement and no smell of gas |
question
| Tightness Test Existing WITH appliances connected will pass if? |
answer
| Pressure drop does NOT exceed values in table And No smell of Gas. |
question
| Tightness Test <28mm pipe E6 Meter<6m3> |
answer
| 8mb |
question
| Tightness Test <28mm pipe U6/G4 meter < 6m3/h pressure drop is..? |
answer
| 4mb |
question
| Tightness Test <28mm U16/G10 >6m3/h <16m3>pressure drop is ? |
answer
| 1mb |
question
| Tightness Test >28mm <35mm E6 Meter<6m3>PRESSURE DROP IS..? |
answer
| 4mb |
question
| Tightness Test >28mm <35mm pipe bore U6/G4 meter < 6m3/h PRESSURE DROP IS..? |
answer
| 2.5mb |
question
| Tightness Test >28mm <35MM U16/G10 >6m3/h <16m3>pressure drop is ? |
answer
| 1mb |
question
| Diaphragm U6/G4 Purge volume for 28mm |
answer
| 0.01m3 |
question
| Ultrasonic E6 meter Purge volume for 28mm |
answer
| 0.01m3 |
question
| Diaphragm U16/G10 Purge volume <28mm >28mm |
answer
| 1.5 x IVm3 |
question
| Diaphragm U6/G4 Purge volume for >28mm |
answer
| 1.5 x IV m3 |
question
| Ultrasonic E6 Purge volume for >28mm |
answer
| 1.5 x IV m3 |
