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Line stopping: temporary pipeline isolation

- without the need for shutdown

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Line stopping is a method of stopping flow and

providing a shut off point where none exists to

an existing pipe or vessel which is still under

pressure or live

Can be performed without the need to shut down

the plant. No need for loss of production or

supply to other areas

To provide temporary isolation to a pipeline for repairs,

refurbishment, alterations, etc so that work can be

undertaken

Definition:

What is it used for?

What are the advantages?

What is Line stopping?

Line stopping

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Oil and gas setor Onshore, offshore and subsea

Petrochemical industry Hydrocarbons – crude & heavy oils Light oils, diesel, kerosene, petroleum,

motor oils Various chemicals

Power generating industry Steam and water

Pharmaceutical & food industry Compressed air Food products

Water industry Potable water and sewerage

Where is line stopping used?

Line stopping

Line stop being carried out on 24” pipeline

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Line stopping: the Furmanite IPSCO advantage

Line stopping

Specialist engineering services provider Vast global experience in pipeline intervention

techniques (hot tapping, line plugging and pipe freezing)

Suitably qualified experienced personnel (SQEP) Extensive inventory and personnel enable multiple

hot tap projects to be undertaken simultaneously

Large diameter capability Full range of fittings and equipment in stock

at all times for customer use

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Line stopping: Basic procedure

Line stopping

Line stop head in position Completion plug installed Blind flange installed

Shown is the line stop machine with the actuator and stopping head ready in its housing for insertion

The temporary valve is part of the line stop equipment. Special bore and configuration valves are used for this purpose

The head is locked in position holding back line pressure

Following the line stopping process, the drilling machine lowers the completion plug through the valve and into its final position

Segment locking screws secure the plug while the boring bar is retracted

The drilling machine and temporary valve are removed and a flange is fitted over the completion plug

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Line stopping: Sure-stop system

Line stopping

Well proven cylinder-wedge stopper method

Available for 4” (100mm) to 46” (1150mm) diameter pipes

Sealing on machine edge eliminates potential problems related to erosion/corrosion - internal pipe build-up, out of roundness, etc

Mechanically wedged seal allows new pipe sections to be pressure tested

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Line stopping: HTP stop

Line stopping

Positive sealing for high temperature and high pressure pipe systems

Metal-to-metal seal eliminates problems from corrosion/erosion internal pipe build-up and out of roundness

Creates a ‘block and bleed’ system

Can remain in-situ longer than elastomer seals

Effective at temperatures up to 370°C (700°F) and pressure ratings up to 1480 psi (102 bar)

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Double-stop and bypass

Typical line stop configurations

Line stopping

1. For valve insertion 2. For permanent relocation using 3-way tees

3. For permanent relocation

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The Furmanite IPSCO folding head system

Line stopping

Equipment is lighter and more readily transported to site

Reduced workspace required around the pipe

Sizes up to 72” (ND 1800 mm) Pressures up to 145psi (10 bar)

The benefits

60” folding head

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The Furmanite IPSCO line stopping

process

Line stopping

Install bypass tees

Install plugging tees

Install vent points

Fabricate bypass

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Install temporary sandwich valves

Drill and tap allconnections

The Furmanite IPSCO line stopping process

Line stopping

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Drill and tap allconnections

The Furmanite IPSCO line stopping process

Line stopping

Install temporary sandwich valves

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Install bypass and commission pipework

FLOW

The Furmanite IPSCO line stopping process

Line stopping

Install upstream plugginghousing ready for installation

Install downstream plugging housing ready for installation

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FLOW

The Furmanite IPSCO line stopping process

Line stopping

Downstream head goes in first to reduce flow

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The Furmanite IPSCO line stopping process

Line stopping

Upstream head goes in second to isolate section of pipeline

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The Furmanite IPSCO line stopping process

Line stopping

Mid-section de-pressurisedthrough vents

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The Furmanite IPSCO line stopping process

Line stopping

Mid section can now be cut out and modified/repaired

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The Furmanite IPSCO line stopping process

Line stopping

After modification/repair, the mid section is connected to the plugging housing

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The Furmanite IPSCO line stopping process

Line stopping

Mid section can now be re-pressurised through the vents and the plugging housing

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The Furmanite IPSCO line stopping

process

Line stopping

Mid section can now be re-pressurised through the

vents and the plugging housing

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FLOW

The Furmanite IPSCO line stopping process

Line stopping

Upstream head is removed first

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FLOW

The Furmanite IPSCO line stopping

process

Line stopping

Followed by downstream plugging head

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FLOW

Bypass can now be de-commissioned

The Furmanite IPSCO line stopping

process

Line stopping

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Line stopping: Typical applications

Line stopping

Application:

Typical two-position line plug with bypass

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Line stopping: Typical applications

Line stopping

Application:

Line stop with reduced bore branch in position

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Line stopping: Typical applications

Line stopping

Application:

Close-up of line stop head in position

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Line stopping: temporary pipeline isolation

- without the need for shutdown