SU1508019A1 - Underwater oil pipeline - Google Patents

Abstract

The invention relates to pipeline liquids and gases, and is intended primarily for underwater pumping of oil from a stationary offshore platform in a shore terminal facility. The aim of the invention is to prevent an oil spill in the aquatic environment if the pipeline is damaged. This is achieved by connecting siphon tanks 7 to the main pipeline 1 at its end sections at the level mainly below the sea level, where the pumped oil is displaced through the discharge pipelines 8 from pipeline 1, in case of its damage. The control of the valves 5, 6 and 9 installed on the main pipeline 1 and by-pass pipelines 8 both during normal operation of the underwater oil pipeline and in an emergency situation (rupture of the main pipeline 1) is performed by an automatic control system 14. 1 sludge.

Description

The invention relates to pipeline transport of liquids and gases and is intended primarily for underwater transportation of oils from a stationary offshore platform in the capacity of the coastal terminal.

The purpose of the invention is the prevention of oil spills in the aquatic environment in case of damage (rupture) of the underwater pipeline.

The drawing schematically shows an underwater oil pipeline with a system of its automatic control and monitoring, general view.

The subsea oil pipeline consists of the main pipeline 1 itself, connecting the flow line of the injection pump 15 to the receiving line of the pump 3, installed respectively on a stationary offshore platform 4 and on the coastal terminal. After the pump 2 and in front of the pump 3, end linear valves 5 and 6 are installed on the main pipeline 1. On the offshore platform 20 and on the shore terminal siphon tanks 7 are installed, which are connected to the end sections of the main pipeline by means of branch pipelines 8 with valves 9 and 25 yes 1 , mainly at a mark below sea level. Siphon tanks 7 are equipped with submersible pumps 10, which are connected via pipelines 11 with valves 12 to reserve tanks (not shown) on the platform 3 and on the shore terminal. A non-return valve 13 is installed on the main pipeline below the valves 5. All the valves are electrically actuated and connected to an automatic control system 14 that operates when the pressure drops in the main pipeline 1.

The oil pipeline in normal operation operates with open valves 4 and 5 and an open non-return valve 13. All other valves are closed.

In case of damage (rupture) of the main pipeline 1 (in the underwater section) and a drop as a result of this pumping pressure, the automatic control system 14 is triggered, at the command of which the pumps 2 and 3 are stopped and the valves 5 and 6 are closed.

At the same time, according to the command of the control system 14, the valves 9 on the discharge pipes 8 are opened and oil from the damaged pipe 1 is forced into the siphon tanks 7 under the pressure of the surrounding water, as they are filled, a command is sent to turn on the submersible pumps 10 and open the valves 12 on the pipes 11, and oil It is pumped to standby tanks on platform 4 and on the shore terminal. After the complete liberation of pipeline 1 from oil, they begin to liquidate the accident.

Claims (2)

Claim 1. Underwater pipeline consisting of the actual pipeline connecting the offshore platform with the coast and having a valve at the ends, characterized in that, in order to prevent oil spills if the pipeline is damaged, it is connected to the trunk pipeline by means of branch pipes with valves of siphon tanks and the system of automatic control and monitoring of the state of the pipeline associated with the valves. 2. Oil pipeline on π. 1, characterized in that the siphon tanks are connected to the main pipeline below sea level.