| 摘要 |
<p>A pig delivery and transport system having a looped line (10) is divided into three sections (10A, 10B, 10C). Line section (10A) is a low pressure non-product line extending from a product receiving facility (PF) or host to an upstream shut-off valve (20). Line (10B) is a high pressure product line section extending from downstream shut-off valve (22) to host facility (PF) and receives product from wells (W1 and W2). Intermediate line section (10C) is a connecting line section between shut-off valves (20, 22) to connect the non-product line section (10A) to the product line section (10B). A pig inserted at host (PF) is transported along low pressure non-product line section (10A) into connecting line section (10C) while upstream shut-off valve (20) is open and vent valve (28) is open in vent line (26).</p> |
