Measurements of flow parameters and decompression wave speed following rupture of rich gas pipelines, and comparison with GASDECOM

摘要

Measurements of flow parameters and decompression wave speeds in a conventional gas mixture and two other rich gas mixtures following rupture of a high-pressure pipe have been conducted. A test rig, consisting of a stainless steel expansion tube (internal diameter approx 50mm), has been used to give a length to diameter ratio of 3440 representing a long section of a pipeline. Pressure- and temperature-time traces obtained with high-frequency response transducers have been collected at various locations close to rupture and along the length of the tube. Tests were conducted at three pressure levels: 10, 14 and 20 MPa and at temperatures as low as -25 deg C. Results indicate good agreement between measured and predicted decompression wave speed by GASDECOM. Additionally, gas temperature-time traces were also measured at different locations along the expansion tube. Since the temperature probes are not as fast in their response, a technique has been developed to reconcile the actual gas temperature from the measured data. The paper presents example results for lean, medium and rich gas mixtures at different initial conditions.