RU2671762C1 - Method of drying compressor shop technological pipelines - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of the gas industry and can be used in the piping of compressor shops in the main gas transportation along a multi-thread gas pipeline system. Method of drying the process piping of the compressor shop is to fill the CS technological system with a gas, launch one group of gas pumping units to the shop "ring", and periodically blow the dust collectors. In the event that the required HCDP is not reached to supply gas to the "main line", transfer of gas extraction to the gas distribution station of own needs from the CS circuit with simultaneous receipt of dry gas to CS circuit from the main gas pipeline through the bypass of the input shop crane is carried out.

EFFECT: technical task is the elimination of gas losses for bleeding gas from the CS circuit, for repeated starts/stops of the gas pumping unit and for purging the dust collectors (DC) when the technological pipelines of the compressor shops are put into operation.

1 cl, 1 dwg

Description

The invention relates to the field of the gas industry and can be used in the piping of compressor workshops for gas trunk transportation through a multi-line system of gas pipelines.

In accordance with the technical requirements of the standard [1], a certain humidity of the gas supplied to the main gas pipeline (MG) must be provided. When carrying out repairs on piping of the compressor workshop (CC), moisture may enter its pipelines. The subsequent commissioning of the CC in the “trunk” should provide the ability to remove moisture from its pipelines in order to prevent ingress of gas that does not meet the humidity standards into the main gas pipeline.

There is a known method of starting a compressor workshop [2], when after filling the technological system of the CC with gas to the passage pressure, one group of gas-pumping units (GPU) is launched to the workshop “ring”. During the operation of the gas compressor unit, dust collectors (PU) are periodically blown out of the workshop gas purification unit. After two hours of operation of the CC on the “ring”, control measurements of TTRV (water dew point temperature) of gas in the main gas pipeline and TTRv on the KV dust collector are made. If the difference between the measured values is more than 10 ° C, the gas is vented from the CC loop with refilling and starting up the GPU group on the workshop “ring”.

The disadvantages of this method are the loss of gas for bleeding the KC circuit, for restarting / shutting down the gas compressor unit and for purging the PU.

The technical result of the invention is to increase efficiency in the field of reducing gas losses (resource saving) and improving environmental safety when starting up the technological pipelines of compressor shops after repair work and commissioning of new compressor shops.

The technical task is to exclude gas losses due to bleeding of the CC circuit, to repeated starts / shutdowns of the gas compressor unit and purge of dust collectors (PU) when the process pipelines of compressor shops are put into operation after repair work and the commissioning of new CCs.

The problem is solved by the fact that when the compressor shop is commissioned, it is used to purge its pipelines with dry gas from the main gas pipeline to the auxiliary gas distribution station (GDS SN) for drying gas in the CC circuit. It does not require bleeding the KC circuit, restarting / shutting down the gas compressor unit and purging the control unit.

A diagram of the drying of technological pipelines of the compressor workshop is shown in FIG. one.

In order to prevent getting into the main gas pipeline 1 that does not meet the gas humidity requirements when starting the CC, its technological system is filled with gas to the passage pressure through valve No. 7р. One GPU group is launched on the workshop “ring” 2 with shut-off valves (CC from the main gas pipeline) cranes No. 7, 8, 8a, open cranes for workshop recycling No. 6, 6A, 6B and open bypass crane No. 7r. During the operation of the gas compressor unit, the dust collectors of the workshop unit for gas purification 3 are periodically purged through candles 4. After two hours of the CC operation, control measurements of gas TTRv to valve No. 7 and TTRv on the CC dust collector are performed. If the difference between the measured values is more than 10 ° C, the gas is transferred to a gas distribution station for auxiliary needs from the KP circuit put into operation (opening cranes No. 106, 107, 22) with the simultaneous flow of dry gas from the main gas pipeline to the KC circuit through the bypass crane No. 7r.

Given the gas flow rate through the gas distribution system, this method does not lead to an increase in the start-up time of the technological pipelines of the compressor station, it eliminates the loss of gas for bleeding the circuit of the compressor station, for restarting / shutting down the gas compressor unit and purging the PU.

List of sources

1. STO Gazprom 089-2010. Combustible natural gas supplied and transported through gas pipelines. - OJSC Gazprom, Moscow, 2010.

2. STO 49.50.21-00159025-55-001-2017. The procedure for the commissioning of sections of gas pipelines. - LLC Gazprom transgaz Ukhta, Ukhta, 2017.

Claims (1)

The method of drying the technological pipelines of the compressor shop, which consists in filling the CC system with gas, launching one group of gas pumping units on the workshop “ring”, periodically purging the dust collectors, measuring after two hours of CC operation on the “ring” of TTRv gas on the CC dust collector, characterized in that in case of failure to achieve the required TTRv for gas supply to the “trunk”, gas is transferred to the auxiliary gas distribution station from the CC circuit with simultaneous feeding dry gas from the main gas pipeline through the bypass of the inlet workshop valve to the circuit.

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