| 摘要 |
<p>A pipeline breakaway coupling assembly comprises first and second sub assemblies 2, 4. The first sub assembly 2 is adapted for connection to a first section of pipeline. The second sub assembly 4 is adapted for connection to a second section of pipeline. Each sub-assembly 2, 4 has an inner wall 22, 62 defining a bore 24, 64. A fastening mechanism such as break bolts 6a, 6b, 6c holds the two sub assemblies 2, 4 together. The fastening mechanism 6a, 6b, 6c is adapted to fail when a predetermined tensile load is applied to the first and second sub assemblies 2, 4. A valve arrangement 44, 78 is associated with each sub assembly 2, 4. Each valve arrangement 44, 78 is positioned in the bore 24, 64 of the corresponding sub assembly 2, 4 and comprises a valve member 46, 80 and a valve seat 54, 59. Each valve arrangement is 44, 78 is switchable between an open state, and a closed state when the fastening mechanism 6a, 6b, 6c fails and the sub assemblies 2, 4 are broken apart allowing pins 122, 124 to disengage from arms 102, 104. Each valve arrangement is adapted such that, when the first and second sub assemblies 2, 4 are held together and each valve arrangement 44, 78 is in the open state, each valve member 46, 80 is positioned away from the peak flow region of that bore. A threaded tool 154 may be used to hold the valve in an open configuration for assembly, and subsequently removed in use. The hole 164 left behind being closed by a plug 168b.</p> |
