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PRCI PR-261-03115
- Decompression Response of High-Pressure Natural Gas Pipelines Under Rupture or Blowdown Conditions
- Report / Survey by Pipeline Research Council International, 08/26/2004
- Publisher: PRCI
$148.00$295.00
L52187e
NOVA
Need: The Pipeline Research Council International, Inc. found that Scandpower have a software that is capable of accurately predicting the transient response of a pipeline segment transporting either conventional or enriched dense phase natural gas mixtures when subjected to a controlled blow down or an uncontrolled rupture event. Consequently PRCI expressed a desire to pursue an experimental work to provide the basis for evaluating the adequacy of the existing software and/or define further development if any. NOVA Research & Technology Corporation (NRTC) was awarded a contract to perform the experimental work and compare results with prediction by the OLGA 2000 software.
Result: The existing NPS 2 stainless steel decompression tube test rig at TCPL Gas Dynamic Test Facility (GDTF) in Didsbury, Alberta, Canada, has been expanded specifically for this project. The initial length of 30 meters was extended to 172 meters in order to simulate a longer length to diameter (L/D) ratio. Two sets of tests were conducted: one to simulate pipeline rupture and another to simulate controlled blowdown. Rupture was simulated by a rupture disc located at one end of the tube, while blowdown was affected by a typical blowdown stack and a reduce-bore ball valve. The test scope included three gas mixtures (conventional, medium rich and rich) and three initial pressures: 10, 14 and 20 MPa.
Benefit: The ultimate deliverable of the PRCI (DC&O Committee) is a Decompression Response Software (DRS) capable of predicting pipeline pressure, temperature and liquid concentration / composition, following full pipe rupture or controlled blowdown of rich mixtures. This software belongs to a class of software tools trying to solve so called conjugated problem of two phase hydraulics and heat exchange with soil (on-shore) or seabed (off-shore). The measure of success in the project will be robustness of the tool as well as quality/uncertainty of predictions. The latter element requires development of reliable experimental data basis for each task as well as validation of the final tool.
NOVA
Need: The Pipeline Research Council International, Inc. found that Scandpower have a software that is capable of accurately predicting the transient response of a pipeline segment transporting either conventional or enriched dense phase natural gas mixtures when subjected to a controlled blow down or an uncontrolled rupture event. Consequently PRCI expressed a desire to pursue an experimental work to provide the basis for evaluating the adequacy of the existing software and/or define further development if any. NOVA Research & Technology Corporation (NRTC) was awarded a contract to perform the experimental work and compare results with prediction by the OLGA 2000 software.
Result: The existing NPS 2 stainless steel decompression tube test rig at TCPL Gas Dynamic Test Facility (GDTF) in Didsbury, Alberta, Canada, has been expanded specifically for this project. The initial length of 30 meters was extended to 172 meters in order to simulate a longer length to diameter (L/D) ratio. Two sets of tests were conducted: one to simulate pipeline rupture and another to simulate controlled blowdown. Rupture was simulated by a rupture disc located at one end of the tube, while blowdown was affected by a typical blowdown stack and a reduce-bore ball valve. The test scope included three gas mixtures (conventional, medium rich and rich) and three initial pressures: 10, 14 and 20 MPa.
Benefit: The ultimate deliverable of the PRCI (DC&O Committee) is a Decompression Response Software (DRS) capable of predicting pipeline pressure, temperature and liquid concentration / composition, following full pipe rupture or controlled blowdown of rich mixtures. This software belongs to a class of software tools trying to solve so called conjugated problem of two phase hydraulics and heat exchange with soil (on-shore) or seabed (off-shore). The measure of success in the project will be robustness of the tool as well as quality/uncertainty of predictions. The latter element requires development of reliable experimental data basis for each task as well as validation of the final tool.
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