RU2499950C1 - Replacement method of main line pump on active oil pipeline - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: oil pipeline is shut off before pump, filling and discharge pipelines are drained by water filling through the pump cavity above the level of drain valves. Then in filling pipeline there drilled is one hole for plugs on the level of drain valve, and the other hole is drilled 80-100 mm higher. Head piece is inserted in each hole, through the lower piece head water is supplied by flexible hoses, and through the upper piece head water is drained with oil components to tanks of emergency leaks gathering, thus forming a hydraulic lock before the pump. The pump is dismantled and a new pump is mounted, hot works are performed, then oil pressure test is conducted under operating pressure and oil pipeline is put into operation.

EFFECT: possibility to reduce labour intensity and duration of works on pump replacement excluding adverse effect of clay plugs use.

1 dwg

Description

The invention relates to pipeline transport, namely the operation of oil pipelines, and is intended for sealing technological pipelines in order to prevent the occurrence of dangerous concentrations of oil vapor.

There is a known method of carrying out work on an existing oil pipeline, in which it is possible to replace the main pump and which consists in emptying a section of the pipeline through drainage valves, cutting out part of the pipeline by welding and stuffing clay plugs into its open ends (plug lengths of at least 2 pipeline diameters) to prevent the occurrence of dangerous concentrations of oil vapor (see RF patent No. 2032124, CL F16L 55/18, publ. 03/27/1995).

The disadvantage of this method is that after welding is completed, hardened clay plugs remain in the cavities of the pipeline, which must be washed for a long time. Also, after commissioning, the clay mass enters the pump casing, which can lead to undesirable consequences - violation of the integrity of the end and gap seals, clogging of the pipes for leakage and cooling of the end seals, wear of the impeller blades, increased pump vibration.

The objective of the invention is to remedy this drawback.

The technical result is to reduce the complexity and duration of work on replacing the pump with the exception of the negative consequences of using clay plugs.

The problem is solved, and the technical result is achieved by the fact that the method of replacing the main pump on the existing oil pipeline is to block the oil pipeline in front of the pump, empty the intake and discharge pipelines by filling them with water through the pump cavity above the level of the drain valves, then drill in the receiving pipeline under the choppers of one hole at the level of the drain valve, and the other - 80-100 mm higher, nozzles are inserted into each hole, while using flexible sleeves through the lower nozzle water is supplied to the dock, and with the traces of oil, it is diverted to the emergency leak collection container, forming a water seal in front of the pump, after which the pump is dismantled and a new one is mounted, hot work is carried out, after which the pressure is crimped with oil and put into operation.

The drawing shows a diagram of the inlet and outlet of water from the surface of the valve.

When replacing the main pump on an existing oil pipeline, the oil pipeline to pump 1 is previously shut off by the main valve until the intake and discharge pipelines are empty by filling them with water through the pump cavity above the level of the drain valves (not shown). In the intake pipe 2, one hole is drilled under the choppers at the level of the drain valve, and the other is 80-100 mm higher. Nozzles with flexible hoses 3 and 4 are inserted into each hole DN = 12 mm. Water is constantly supplied from the nozzle 5 from the tank 5 with a volume of 1 m ³ installed above the floor surface of the pumping station through the lower nozzles. Water entering the pipe 2 through the lower nozzle flows out of the upper nozzle and is discharged along the antistatic flexible sleeve 4 into the emergency leakage tank 6, thereby forming a water seal in front of the pump. The lower point of the tank 5 is located above the steady-state water level of the hydraulic seal. The water flow is regulated by the upper level of the supply tank 5.

When traces of oil appear on the surface of the hydraulic seal due to the flow of liquid from the lower nozzle to the upper, the oil film will be poured into the tank 6 for emergency leak collection.

After that, the pump is dismantled and a new one is mounted, fire (welding) work is carried out, after which they are crimped with oil using working pressure and the pipeline is put into operation.

The method is more convenient from the point of view of the work, reduces the cost of time, eliminates the use of clay plugs, allows you to control the presence of oil in the pipeline, reduces the likelihood of increased gas contamination in the air of the working area, which generally increases the safety of the work.

Claims (1)

The method of replacing the main pump on an existing oil pipeline, which consists in blocking the oil pipeline in front of the pump, emptying the intake and discharge pipelines by filling them with water through the pump cavity above the level of the drain valves, then drill one hole at the level of the drain valve under the choppers, and the other - 80-100 mm higher, nozzles are inserted into each hole, while using flexible hoses, water is supplied through the lower nozzles, and oil is removed through the upper nozzle with traces a capacitance Emergency collecting leakages, forming a hydraulic lock in front of the pump, then the pump dismantled and assembled new firing operation is carried out, after which the molding is performed and the oil pressure working oil is introduced into service.